Abstract:
The present invention relates to probiotic compositions and kits thereof, comprising live bacteria belonging to the natural flora of the human body cavity such as intestine and vaginal tract, in particular, strains of  lactobacillus  or  bifidobacterium  species, and low molecular-weight non-proteinaceous iron chelators capable of lowering the iron concentration over the whole physiological pH-range of relevance to levels that inhibit growth of pathogens, but which allow for the growth of the bacteria of the composition.

Description:
[0001]    The present invention generally refers to probiotic and therapeutic formulations and, more in particular, it relates to compositions comprising lactic acid bacteria or bifidobacteria with low molecular weight non-proteinaceous iron chelators, useful for the treatment of infections of the human body cavities. 
       BACKGROUND OF THE INVENTION 
       [0002]    Infections of human body cavities such as, for example, the female genital tract and the intestine, are widely spread pathological conditions known to affect, even recurrently, the majority of population. 
         [0003]    Antibiotics are often used to combat these pathological conditions despite the fact that their prolonged use may contribute to the emergence of antibiotic-resistant pathogenic bacterial strains. 
         [0004]    As this emergence may pose a serious risk to human beings, it is highly desirable to develop products for the therapy of infections of the body cavities that are not based on antibiotics and, hence, do not lead to the development of antibiotic resistance. 
         [0005]    Body cavities including the vaginal tract, the male urethra, the intestine and the buccal cavity, are known to be naturally colonized by probiotic bacteria, for instance lactic acid bacteria and bifidobacteria. The normal flora of both the vagina and the gastrointestinal tract consists of a wide variety of genera and species, either anaerobic or aerobic, dominated by the facultative microaerophilic anaerobic genus  Lactobacillus  (Ref. 1, 2 and 8). These species are known to defend the mucosal surfaces from colonization by pathogenic microorganisms such as, e.g., toxigenic bacteria and yeasts. 
         [0006]    In this respect, the so-called probiotic approach to health maintenance and therapy consists, essentially, in delivering the probiotic bacteria to the body cavities, which in healthy individuals are inhabited by commensal microorganisms, in order to fostering or reconstituting the natural environment. 
         [0007]    To this extent, as commensal microorganisms are known to compete with pathogenic ones, they can have disease preventive properties or even curative properties. 
         [0008]    Many commensal microorganisms have been studied so far and special attention has been given to various  lactobacillus  or  bifidobacterium  species as well as to  Enterococcus faecium  SF68 and the yeast  Saccharomyces boulardii.    
         [0009]    Among them, particularly promising appear to be  lactobacillus  and  bifidobacterium  species. 
         [0010]    Lactic acid bacteria and bifidobacteria are natural hosts of the intestines and the vagina, where they protect the tissue from pathogenic organisms that, by adhering to the mucosa and tissues, may invade body cavities. 
         [0011]    It has been shown that  Lactobacillus paracasei  strains CNCM I-1390 and CNCM I-1391 and  Lactobacillus acidophilus  strain CNCM I-1447, isolated from healthy babies, bind in large numbers to both buccal and intestinal epithelial cells (Ref. 29), thus demonstrating that they naturally adhere to the same mucosal cells as it may occur for pathogenic microorganisms. 
         [0012]    As such, a competition for binding sites between pathogenic microbes and healthy lactic acid bacteria, within body cavities, has been demonstrated (Ref. 30 and Ref. 37). 
         [0013]    Some lactic acid bacteria, in addition, proved to inhibit growth of pathogens. Among them are, for example,  Lactobacillus paracasei  strains CNCM I-1390 and CNCM I-1391 and  Lactobacillus acidophilus  strain CNCM I-1447 that are able to inhibit, in vitro, the growth of enterotoxigenic  E. coli  ATCC 35401 or  Salmonella enteritidis  IMM 2. 
         [0014]    Moreover, a mixture of these  lactobacillus  strains resulted particularly effective in the inhibition, although weak, even of the  Vibrio cholerae  E1 Tor (Ref. 31). 
         [0015]    Because of all the above, pharmaceutical products containing lactic acid bacteria or bifidobacteria, for the prevention or treatment of pathological infections, are known in the art and have been already described. 
         [0016]    Among them are, just as an example, vaginal capsules comprising a strain of  Lactobacillus gasseri; lactobacillus  vaginal suppositories to prevent recurrence of urinary tract infections after antibiotic therapy (Ref. 3); vaginal medicaments based preferably on  Lactobacillus crispatus  CTV-05 effective against a variety of pathogens (Ref. 4). 
         [0017]    Various other products also intended for oral administration and containing live lactic acid bacteria or bifidobacteria are also known in the art and recommended, for instance, in the treatment of diarrhea. These products may come either as pharmaceutical formulations or in the form of fermented milk products. 
         [0018]    However, although disease prevention and/or therapy with commensal lactic acid bacteria and bifidobacteria have shown some efficacy (Ref. 5 to 12), the evidence was never sufficiently convincing to lead to a widely spread standard form of treatment. Presumably, this is because they are not yet as effective as one would expect, at least on theoretical basis. 
         [0019]    It is known that iron is an essential growth factor, basically for every cell and microorganism. The unsatisfactory therapeutic results obtained with previous products comprising commensal microorganisms have been thus associated with too elevated concentrations of free iron (III) ions, which promote the growth of pathogens while disfavoring a number of lactic acid bacteria. 
         [0020]    Lactoferrin (see The Merck Index, XIII Ed., 2001, No. 9647), a glycoprotein endogenously produced by neutrophils and also known to be a major component of secreted fluids, including saliva, gastric juices and bile, is a very important factor of the human milk bacteriostatic system. 
         [0021]    Because of its iron chelating properties, the inclusion of lactoferrin, either per se or in combination with other organic components, is widely known in the art, particularly regarding the dietary supplements (Ref. 14). 
         [0022]    Lactoferrin capsules may thus contain, for example, said protein with a degree of purity up to 95% and in amounts up to 480 mg. 
         [0023]    However, in preliminary therapeutic trials with very small numbers of patients, only few indications of any antibacterial (Ref. 15) and antiviral efficacy (Ref. 16) of the lactoferrin based products were obtained, and the results were insufficient to fostering further studies on this approach. 
         [0024]    Some combinations of lactic acid bacteria with lactoferrin are also commercially available (e.g., Colostrum with Lactoferrin Chewable Tablets, Peak Nutrition Inc., Syracuse N.Y.). In this product, however, the quantity of live bacteria (≦3.4×10 6  CFU) is orders of magnitude below the limit required for effective intestinal colonization. 
         [0025]    Moreover, to the extent of our knowledge, there are no animal or clinical studies demonstrating the efficacy of the combination of lactic acid bacteria with lactoferrin over the bacteria alone. 
         [0026]    Lactoferrin has also been suggested to have multiple biological roles including facilitating iron absorption, modulating the immune response, regulating embryonic development and influencing cell proliferation. In addition, it has also been demonstrated the role of the mentioned protein in regulating the release of tumor necrosis factor alpha and interleukin 6 (Ref. 17). 
         [0027]    Oral lactoferrin may thus produce many different effects than simple sequestration of iron ions. 
         [0028]    Remarkably, it has been demonstrated that certain pathogens can even utilize lactoferrin as an iron source (Ref. 18), thereby counteracting the intended purpose of withholding iron ions from bacteria. For these reasons, the possible therapeutic use of lactoferrin remains a very questionable choice if solely chelation or sequestration of iron ions is intended to be associated with probiotic bacteria. 
         [0029]    A low molecular weight natural chelator for iron, namely deferoxamine (see The Merck Index, XIII Ed., 2001, No. 2879), has been used to study the mechanisms of bacterial iron transport and its participation in the competition of commensal lactic acid bacteria with the pathogen  Neisseria gonorrhoeae,  in the mouse genital tract (Ref. 19). It was observed that “the degree of  lactobacillus  grown on base agar with and without deferoxamine was similar” and it was therefore concluded that “commensal lactobacilli may increase the availability of iron to  N. gonorrhoeae  during infection of females, although the exact mechanism by which this occurs is not known”. 
         [0030]    Furthermore, it is also known the ability of certain Bifidobacteria to produce a siderophore, particularly where said bifidocateria are grown on agar in the presence of an iron chelator moiety (Ref. 38). 
         [0031]    Nevertheless, no suggestions regarding the possible use of a chelator in the formulation of therapeutic or probiotic products were ever made. In any case, it is known that certain bacteria actually possess a deferoxamine receptor (Ref. 20). Accordingly, being a natural siderophore, i.e., an iron uptake mediator, from  Streptomyces pylosus,  it can also act as siderophore for certain pathogenic bacteria, e.g.,  Yersinia enterocolitica  and  Yersinia pseudotuberculosis  (Ref. 21), thus exerting the undesired feature of iron donor. 
         [0032]    Low molecular weight non-proteinaceous iron chelators have been shown to possess antimicrobial activity on species that require iron. 
         [0033]    In particular, ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), trans-1,2-diaminocyclohexane-N,N,N′,N′-tetraacetic acid (CDTA) and triethylene-tetraaminehexaacetic acid (TTHA) have been shown to inhibit the growth of  Staphylococcus epidermidis  (Ref. 22). A number of chelators including R,S-ethylenediaminedisuccinic acid (R,S-EDDS), have been shown to inhibit growth of  Corynebacterium xerosis  ATCC 7711 (Ref. 23). 
         [0034]    Low molecular weight non-proteinaceous iron chelators have also been proposed as additives in buccal disinfectants (Ref. 24), as additives in topical deodorant formulations (Ref. 22, 23 and 25), as components of bactericidal compositions for intestinal use (Ref. 26) and, apparently, for topical use (Ref. 27). A catamenial tampon carrying a chelator was also conceived (Ref. 25). 
         [0035]    Chelators with selectivity for first transition series elements, which include iron, intended for use in several biomedical applications, including bacterial and fungal replication, are known in the art (Ref. 28). 
         [0036]    However, as the aforementioned prior art documents disclose compositions including chelators being intended for their bactericidal or even sterilizing property, said compositions could not be used for the prevention and/or treatment of infections within human body cavities, as their effect would be detrimental also for the lactic acid bacteria and bifidobacteria actually present in the flora of healty individuals. 
         [0037]    To our knowledge, no products combining lactic acid bacteria or bifidobacteria with low molecular weight non-proteinaceous iron chelators are described, or even theoretically suggested, in the prior art. 
       SUMMARY OF THE INVENTION 
       [0038]    We have now found that selected iron chelating agents incorporated into pharmaceutical or probiotic formulations comprising live lactic acid bacteria or bifidobacteria permit, unexpectedly, the growth of probiotic bacteria while inhibiting the growth of pathogenic microorganisms. 
         [0039]    Accordingly, the present invention relies on a product that combines: 
         [0040]    (a) live bacteria belonging to the natural flora of the body cavity considered, preferably strains of  lactobacillus  or  bifidobacterium  species, even more preferably those species selected for their high tendency to bind to mucosal surfaces, and/or to co-aggregate with pathogens, with 
         [0041]    (b) low molecular weight non-proteinaceous iron chelators able to decrease the iron concentration over the physiological pH-range of relevance, to levels that inhibit the growth of pathogens, whilst allowing the growth of the bacteria of the composition. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0042]    It is therefore a first aspect of the present invention a pharmaceutical or probiotic composition comprising: 
         [0043]    (a) at least one  lactobacillus  species and strain or at least one  bifidobacterium  species and strain, or any mixtures thereof; and 
         [0044]    (b) at least one low molecular weight non-proteinaceous iron chelator. 
         [0045]    The compositions of the invention are particularly advantageous as they may be used in the prevention and/or treatment of pathologies or pathological states due to infections of the human body cavities. 
         [0046]    In the present description, and unless otherwise provided, with the term  lactobacillus  species and strain and  bifidobacterium  species and strain we intend those species and strains having a good tolerability in humans and a high affinity for human mucosa. 
         [0047]    Preferably, the  lactobacillus  strain belongs to the species selected from  Lactobacillus johnsonii, Lactobacillus reuterii, Lactobacillus paracasei, Lactobacillus casei, Lactobacillus animalis, Lactobacillus ruminis, Lactobacillus acidophilus, Lactobacillus rhamnosus, Lactobacillus fermentum,  and  Lactobacillus delbrueckii  subsp.  Lactis.    
         [0048]    Even more preferably,  lactobacillus  strains are those selected from the group consisting of  Lactobacillus johnsonii  La1 NCC 2461 (=CNCM I-2116),  Lactobacillus reuterii  strains 4000 and 4020 (from BioGaia Biologics Inc., Raleigh, N.C.),  Lactobacillus paracasei  strains CNCM I-1390, CNCM I-1391, CNCM I-1392,  Lactobacillus casei  strain Shirota,  Lactobacillus acidophilus  strain CNCM I-1447,  Lactobacillus acidophilus  Lat 11/83,  Lactobacillus acidophilus  NCC 2463 (=CNCM I-2623),  Lactobacillus rhamnosus  GG (ATCC 53103),  Lactobacillus rhamnosus  271 (DSMZ 6594) and  Lactobacillus rhamnosus  VTT E-800. 
         [0049]    As far as the  bifidobacterium  strain is concerned, it preferably belongs to the species selected from:  Bifidobacterium  spp.,  Bifidobacterium bifidum, Bifidobacterium longum, Bifidobacterium pseudolongum, Bifidobacterium infantis, Bifidobacterium adolescentis,  and  Bifidobacterium lactis.    
         [0050]    Even more preferably,  bifidobacterium  strains are selected from the group consisting of:  Bifidobacterium bifidum  NCC 189 (=CNCM I-2333),  Bifidobacterium adolescentis  NCC 251 (=CNCM I-2168),  Bifidobacterium lactis  (ATCC 27536),  Bifidobacterium breve  CNCM I-1226,  Bifidobacterium infantis  CNCM I-1227, and  Bifidobacterium longum  CNCM I-1228. 
         [0051]    All the mentioned lactobacilli and bifidobacteria are well known to the skilled person and they may be isolated according to known methods or, in case, they may be obtained directly from the referred bacterial collections. 
         [0052]    Unless otherwise provided, the pharmaceutical or probiotic compositions of the invention may comprise one or more  lactobacillus  species and strain, or one or more  bifidobacterium  species and strain, or even any mixture thereof, selected from the aforementioned lactobacilli and bifidobacteria. 
         [0053]    Preferably, however, the compositions comprise at least one  lactobacillus  species and strain or at least one  bifidobacterium  species and strain. 
         [0054]    Even more preferably, the pharmaceutical or probiotic compositions of the invention comprise at least one  lactobacillus  species and strain. 
         [0055]    In the present description, unless stated otherwise, with the term chelator we intend chemical moieties, agents, compounds or molecules, either as such or in the form of pharmaceutically acceptable salts, characterized by the presence of functional groups which are able to form a complex by more than one coordination bond with a transition metal or another metal entity. 
         [0056]    In the specific case, the chelator, otherwise known as chelating agent, according to the invention, is a physiologically acceptable derivative enabling for the formation of an iron coordination complex, acting by that as an iron sequestring agent. 
         [0057]    Most preferred iron chelators are those with a conditional formation constant for iron (III) ions over the pH range of 4.6 to 8.2, of at least 10 15  L/mol, and preferably above 10 17  L/mol. 
         [0058]    With the term physiologically acceptable we intend any chelator suitable for the administration to humans for the intended therapeutic use, in combination with the above lactobacilli and/or bifidobacteria, in any suitable administration routes. 
         [0059]    With the term non-proteinaceous chelator or chelating agent we intend any chelators not having the characterizing structures of proteins, being the definition of protein widely known to the skilled person. 
         [0060]    Typically, the non-proteinaceous chelator of the invention has an average molecular weight (MW) lower than 10 kDa, more preferably lower than 5 kDa and even more preferably lower than 1 kDa, that is well below the average MW of the protein structures (e.g. lactoferrin MW=80 kDa). 
         [0061]    Suitable chelating agents are, for instance, selected from the group consisting of: pyridinone derivatives such as Deferiprone (see The Merck Index, XIII Ed. 2001, No. 2878), hydroxamates such as Desferroxamine B or acetohydroxamic acid; cathecols such as 1,8-dihydroxynaphthalene-3,6-sulfonic acid, MECAMS, 4-LICAMS, 3,4-LICAMS, 8-hydroxyquinoline or disulfocathecol; polyaminopolycarboxylic acids and derivatives thereof comprising, inter alia, ethylenediamine-N,N′-bis(2-hydroxyphenylacetic acid) (EDDHA), N-(hydroxyethyl)-ethylenediaminetriacetic acid (HEDTA), N,N′-bis(2-hydroxybenzyl)-ethylenediamine-N,N′-diacetic acid (HBED), N,N′-ethylenebis-2-(O-hydroxyphenyl)glycine (EHPG), triethylene-tetraaminehexaacetic acid (TTHA), diethylenetriamine pentaacetic acid (DTPA), DTPA-bismethylamide, benzo-DTPA, dibenzo-DTPA, phenyl-DTPA, diphenyl-DTPA, benzyl-DTPA, dibenzyl-DTPA, N,N-bis[2-[(carboxymethyl)[(methylcarbamoyl)methyl]ethyl]-glycine (DTPA-BMA), N-[2-[bis(carboxymethyl)amino]-3-(4-ethoxyphenyl)propyl)]-N-[2-[bis(carboxymethyl)amino]ethyl]glycine (EOB-DTPA), 4-carboxy-5,8,11-tris(carboxymethyl)-1-phenyl-2-oxa-5,8,11-triazatridecan-13-oic acid (BOPTA), N,N-bis[2-[bis(carboxymethyl)amino]ethyl]L-glutamic acid (DTPA-GLU) and DTPA-Lys; ethylenediaminotetraacetic acid (EDTA), trans-1,2-diaminocyclohexane; N,N,N′,N′-tetraacetic acid (CDTA), NTA, PDTA, 1,4,7,10-teraazacyclododecane-1,4,7,-triacetic acid (DO3A) and derivatives thereof including, for example, [10-(2-hydroxypropyl)-1,4,7,10-teraazacyclododecane-1,4,7,-triacetic acid (HPDO3A) and corresponding [10-(2-hydroxypropyl)-1,4,7,10-tetraazado decane-1,4,7-triacetato(3-)-N 1 ,N 4 ,N 7 N 10 ,O 1 ,O 4 ,O 7 ,O 10 ]calcinate(1-), calcium (2:1), better known as calteridol or Ca 3 (HPDO3A) 2 , 1,4,7-triazacyclononane-N,N′,N″-triacetic acid (NOTA), 6-[bis(carboxymethyl)amino]tetrahydro-6-methyl-1H-1,4-diazepine-1,4(5H)-diacetic acid (AAZTA) and derivative thereof, 1,4,7,10-tetraazacyclotetradecane-1,4,7,10-tetraacetic acid (DOTA) and derivatives thereof including, among others, benzo-DOTA, dibenzo-DOTA, (α,α′,α″,α′″)-tetramethyl-1,4,7,10-tetraazacyclo-tetradecane-1,4,7,10-tetraacetic acid (DOTMA), and 1,4,8,11-tetraazacyclotetradecane-N,N′,N″,N′″-tetraacetic acid (TETA), or corresponding compounds wherein one or more carboxylic group is replaced by a phosphonic and/or phosphinic group including, for instance, N,N′-bis-(pyridoxal-5-phosphate)-ethylenediamine-N.N′-diacetic acid (DPDP), ethylenedinitrilotetrakis(methylphosphonic) acid (EDTP), 1,4,7,10-tetraazacyclotetradecane-1,4,7,10-tetra(methylenepho sphonic) acid (DOTP); as well as texaphyrins, porphyrins and phthalocyanines. 
         [0062]    Preferred chelating agents according to the present invention include Deferiprone, HPDO3A and derivatives thereof such as, inter alia, calteridol, DTPA and derivatives thereof comprising, for instance, DTPA-Glu and DTPA-Lys; DOTA and derivatives thereof; BOPTA; AAZTA and derivatives thereof; EDTA and derivatives thereof; TETA and derivatives thereof. 
         [0063]    The above listed chelating agents are widely known in the art and may be in case prepared according to known methods. For most of them, in addition, there already exists experience with human use. 
         [0064]    For a general reference to iron chelators see, for instance, Zu D. Liu, Robert C. Hider; Design of iron chelators with therapeutic application; Coordination Chemistry Reviews Volume 232, Issues 1-2, October 2002, Pages 151-171. 
         [0065]    As an example, the iron chelator DTPA in the form of calcium trisodium pentetate (Ditripentat®, Heyl &amp; Co., Berlin, Germany) is used subcutaneously, at daily doses of 0.5 to 1 g for 5 days a week, for the treatment of thalassemia in patients with high-tone deafness caused by deferoxamine (Ref. 32). 
         [0066]    Additionally, although in the form of a salified gadolinium complex, gadopentetate dimeglumine (Magnevist®, Schering AG, Berlin, Germany) is used as a contrast agent for magnetic resonance imaging. Its enteral form contains trisodium pentetate as excipient at a level of 455 mg/L of administrable drink. 
         [0067]    As the maximal recommended dose is 1 L, an oral dose of 455 mg (0.99 mmol) of trisodium pentetate is already being used and proven to be safe, at least for a single administration. The acute oral semilethal dose (LD 50 ) of DTPA in mice is 3500 mg/kg. Thus, DTPA is a safe oral drug, representing a preferred iron chelator for the compositions of the present invention. 
         [0068]    Likewise, the compound 4-carboxy-5,8,11-tris(carboxymethyl)-1-phenyl-2-oxa-5,8,11-triazatridecan-13-oic acid (BOPTA) has been found to have an acute oral LD 50  in mice of 8.4 mmol/kg. It is therefore a further preferred iron chelator for the compositions of the invention. 
         [0069]    For the pharmaceutical use, these chelators may also be formulated as complexes in the form of a pharmaceutical acceptable salt, including neutral salts, such as in particular, calcium complexes. In this direction, in fact, the calcium binding affinity is weak enough to not substantially interfere with the iron binding of pharmacological interest. 
         [0070]    In this respect, another preferred iron chelator in the form of a calcium complex, is calteridol also known as Ca 3 (HPDO3A) 2  and corresponding to [10-(2-hydroxypropyl)-1,4,7,10-tetraazadodecane-1,4,7-triacetato(3-)-N 1 ,N 4 ,N 7 ,N 10 ,O 1 ,O 4 ,O 7 ,O 10 ]calcinate(1-), calcium (2:1), which is used in the intravenous contrast agent formulations of Gadoteridol (see The Merck Index, XIII Ed., 2001, No. 4353). 
         [0071]    The preferred therapeutic or probiotic compositions of the invention can be formulated in different ways, depending on the desired route of administration, according to methods adopted in the pharmaceutical field. 
         [0072]    Preferably, the compositions of the invention may be administered either orally or topically, as reported in more details herein below. 
         [0073]    As an example, said compositions can be formulated as a mixture of components or, alternatively, they can equally be offered as separate pharmaceutical formulations in a single kit, for example for the simultaneous or sequential oral or vaginal administration. Therefore, it is an additional embodiment of the invention a kit of parts wherein a first part comprises at least one  lactobacillus  species and strain or at least one  bifidobacterium  species and strain, or mixtures thereof, and a second part comprises at least one low molecular-weight non-proteinaceous iron chelator. 
         [0074]    Non limitative examples of particularly preferred compositions of the invention are disclosed below. 
         [0075]    Compositions for Intestinal Use 
         [0076]    A first embodiment of the invention is represented by the compositions generally intended for gastrointestinal use, to be preferably administered as a drink, a capsule, an infant formula or a dairy product. 
         [0077]    To this extent, the selected bacterial strains may be suitably employed so that the amount of bacteria available to the individual corresponds to about 10 3  to about 10 14  CFU per day, preferably from about 10 7  to about 10 12  CFU per day, and even more preferably from about 10 9  to about 10 12  CFU per day. 
         [0078]    The corresponding amount of iron chelator may range from about 10 −3  to about 10 −9  mol, and preferably from 10 −4  to about 10 −7  mol. 
         [0079]    In case the compositions of the invention should be intended in the form of an oral formulation, they might be offered in any proper form, such as, among others, a milk drink, a yoghurt-similar milk product, a cheese, an ice-cream, a fermented cereal-based product, a milk-based powder, an infant formula, a tablet, a capsule, a liquid suspension, a dried oral grit or powder, a wet oral paste or jelly, a grit or powder for dry tube feeding or a fluid for wet tube feeding. 
         [0080]    Alternatively, the drink may be prepared before use from a dissolvable capsule containing the active ingredients. 
         [0081]    Preferably, the drink may be prepared before use by reconstituting a dry powder containing the lyophilized bacteria and the iron chelator or, alternatively, by reconstituting a dry powder containing the lyophilized bacteria with a physiological solution already comprising the chelator. 
         [0082]    The dry powder is preferably packaged in such a way that the stability of the solid may be retained along the time, such as for instance, into airtight and light-tight sachets, under air or nitrogen, under a noble gas or under vacuum. 
         [0083]    As far as the capsules are concerned, they may be properly manufactured according to conventional methods. 
         [0084]    From all of the above, it is clear to the skilled person that the compositions of the invention may further comprise any additional excipients among those commonly employed in pharmaceutical formulations, in order, for instance, to stabilize the compositions themselves, or to render them easily dispersible or to give them an agreeable taste. 
         [0085]    Among said excipients inulin, fructose, starch, xylo-oligosaccharides, silicon oxide, buffering agents as well as flavors, are suitable examples. 
         [0086]    Furthermore, optional active ingredients may be also present in the compositions of the invention such as, for instance, vitamins, amino acids, polypeptides and the like. 
         [0087]    An example of an optional active ingredient may be represented by glutamine (Ref. 33) which may help intestinal cells to defend themselves under stress conditions due to pathogenic organisms (Ref. 34 and 35). 
         [0088]    Alanyl-glutamine (Ref. 36) as well as a variety of vitamins may also represent additional ingredients within the compositions. 
         [0089]    The presence of transition metals should be preferably avoided so to not impair the binding and/or sequestration of the naturally occurring iron ions by the chelator. However, by considering that the preferred chelators according to the invention bind iron ions much stronger than other physiological transition-metal ions, for instance zinc or copper, the presence of these latter substantially does not affect the efficacy of the present compositions. 
         [0090]    Compositions for Vaginal Use 
         [0091]    According to an additional embodiment, the present invention also provides for a composition intended for the vaginal use, for instance as a compressed vaginal suppository or insert, preferably as a rapidly dissolving type, such as a tampon or a douche. 
         [0092]    Vaginal suppositories and capsules are well-known pharmaceutical formulations. During their manufacturing process, however, special cares should be taken to operate at temperature conditions at which the bacteria may survive, according to methods known in the art (Ref. 4). 
         [0093]    Vaginal inserts are also known in the art and may be manufactured, for instance, by powder compression of maltodextrin beads including the components of the invention (Ref. 4). 
         [0094]    Standard catameneal tampons, and their production methods, can be well adapted for obtaining vaginal tampons bearing the ingredients of the invention on their surface; preferably, the final tampon is packaged in a way suitable for the protection from moisture. 
         [0095]    Vaginal douches are commercially known and generally consist of a product to be locally applied by a proper applicator, hence suitable for the vaginal delivery of the compositions of the invention. 
         [0096]    Clearly, unlike otherwise provided, also the compositions intended for vaginal use may comprise additional excipients among those known in the art (e.g., buffering agents) and/or active ingredients known for formulations of this type. 
         [0097]    The compositions of the invention resulted to be particularly effective in the colonization of the gastrointestinal tract or the vaginal tract and, hence, allow for the restoration of a well functioning microflora, particularly in the case of a previous use of antibiotics. 
         [0098]    It will be self evident to the skilled person, that said compositions may find a wide range of applications either in the maintenance of probiotic bacteria adhering to healthy mucosal surfaces or in the treatment of the infections of the human body cavities such as, e.g., the vaginal tract, the male urethra, the intestine and the buccal cavity. 
         [0099]    Vaginal infections wherein the compositions of the invention may be advantageously used may comprise, as non limiting examples, bacterial vaginosis, symptomatic yeast vaginitis, gonorrhea, chlamydia, trichomoniasis, human immunodeficiency virus infection, urinary tract infection or pelvic inflammatory disease. 
         [0100]    Further, among the pathological conditions of the gastrointestinal tract, the compositions of the invention may be used for the treatment of acute diarrhea in adults and infants, rotavirus-related, travel&#39;s or antibiotic-associated diarrhea, and recurrent  clostridium difficile  colitis. 
         [0101]    Experimental Section 
         [0102]    With the aim of illustrating the present invention, without posing any limitation to it, the following examples are now given. 
       EXAMPLE 1  
       [0103]    Drink Formulation 
         [0104]    A powder containing lactobacilli and at least one small molecular weight non-proteinaceous iron chelator, suitable for preparing a drink, was formulated to have the following composition: 
         [0000]    
       
         
               
               
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 Inulin 
                 145.00 
                 kg 
               
               
                   
                 Fructose 
                 57.69 
                 kg 
               
               
                   
                 L-glutamine 
                 50.00 
                 kg 
               
               
                   
                 Xylo-oligosacchrides 
                 25.00 
                 kg 
               
               
                   
                   Lactobacillus paracasei  CNCM I-1390 
                 11.13 
                 kg 
               
               
                   
                 (3.85 × 10 11  CFU/g) 
               
               
                   
                 Orange aroma 
                 10.50 
                 kg 
               
               
                   
                 Silicon dioxide 
                 0.40 
                 kg 
               
               
                   
                 Pentetate calcium trisodium (DTPA CaNa 3 ) 
                 0.21 
                 kg 
               
               
                   
                 Vitamin B6 hydrochloride 
                 0.07 
                 kg 
               
               
                   
                 Lot 
                 300.00 
                 kg 
               
               
                   
                   
               
             
          
         
       
     
         [0105]    Portions of 7 g of this powder were filled into sachets under low humidity conditions and sealed. A single dose of the drink consisted in the content of a sachet suspended in a glass of water. 
       EXAMPLE 2  
       [0106]    Drink Formulation 
         [0107]    Analogously to Example 1, a powder containing the selected strain of lactobacilli and the small molecular weight non-proteinaceous iron chelator was formulated, wherein the chelator was calteridol, which is [10-(2-hydroxypropyl)-1,4,7,10-tetraazadodecane-1,4,7-triacetato(3-)-N 1,N   4 ,N 7 ,N 10 ,O 1 ,O 4 ,O 7 ,O 10 ]calcinate(1-), calcium (2:1), abbreviated Ca 3 (HP-DO3A) 2 , in the same amount. 
       EXAMPLE 3  
       [0108]    Drink Formulation 
         [0109]    A powder containing the selected lactobacilli strain and at least one small molecular weight non-proteinaceous iron chelator suitable for preparing a drink was formulated to have the following composition: 
         [0000]    
       
         
               
               
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 Corn starch 
                 86.24 
                 kg 
               
               
                   
                 Fructose 
                 120.00 
                 kg 
               
               
                   
                 L-glutamine 
                 42.87 
                 kg 
               
               
                   
                 Xylo-oligosacchrides 
                 30.00 
                 kg 
               
               
                   
                   Lactobacillus paracasei  CNCM I-1390 
                 11.13 
                 kg 
               
               
                   
                 (3.85 × 10 11  CFU/g) 
               
               
                   
                 Orange aroma Drycell 01142 
                 9.00 
                 kg 
               
               
                   
                 Silicon dioxide 
                 0.33 
                 kg 
               
               
                   
                 Deferiprone (1,2-dimethyl-3-hydroxypyrid-4-one) 
                 0.43 
                 kg 
               
               
                   
                 Lot 
                 300.00 
                 kg 
               
               
                   
                   
               
             
          
         
       
     
         [0110]    Portions of 7 g of this powder were filled into sachets under low humidity conditions and sealed. A single dose of the drink consisted in the content of a sachet suspended in a glass of water. 
       EXAMPLE 4  
       [0111]    Therapeutic Infant Formulation 
         [0112]    A therapeutic infant formulation was obtained by mixing from 0.5% to 5%, preferably 2%, of polypeptides; from 0.2% to 10%, preferably 4%, of fat; from 1% to 25%, preferably 8%, of non-levan carbohydrates (including lactose 65%, maltodextrin 20% and starch 15%); a proper amount of an iron chelator, and at least 10 6  CFU/mL of the following strain:  Lactobacillus acidophilus  CNCM I-1447, in combination with traces of vitamins to meet the daily requirements; from 0.01% to 2%, preferably 0.3%, of minerals, and from 50% to 75% of water. 
       EXAMPLE 5  
       [0113]    Therapeutic Dairy Product 
         [0114]    A yoghurt-like milk product was prepared by the following procedure. One liter of a milk product containing 2.8% of fats and supplemented with 2% of skimmed milk powder and 6% of sucrose was prepared. Then, the product was pasteurized at 96° C. for 30 min according to known methods. A proper amount of calteridol was then added. 
         [0115]    A preculture of  Lactobacillus paracasei  CNCM I-1390 was reactivated in a medium containing 10% of reconstituted milk powder and 0.1% of commercial yeast extract with 1% sucrose. The pasteurized milk product was then inoculated with 1% of the reactivated preculture and this milk product was then allowed to ferment until the pH reaches a value of 4.5. The resulting therapeutic yoghurt-like milk-product was stored at 4° C. 
       EXAMPLE 6  
       [0116]    Vaginal Suppository 
         [0117]    In a sterilized blender, 0.12 kg finely ground calteridol was blended with 1.33 kg of polyethylene glycol 1000 (PEG 1000) under nitrogen, during which the polyethylene glycol melts. Under continued mild mixing the calteridol-PEG 1000 mixture was cooled until returned to a semi-solid consistency. 
         [0118]    By intensive mechanical mixing and under vacuum in a cooled container, the following ingredients were admixed: 
         [0000]    
       
         
               
               
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 Polyethylene glycol 1000 
                 72.43 
                 kg 
               
               
                   
                 Polyethylene glycol 4000 
                 24.48 
                 kg 
               
               
                   
                   Lactobacillus paracasei  CNCM I-1390 
                 2.00 
                 kg 
               
               
                   
                 (3.85 × 10 11  CFU/g) 
               
               
                   
                 Calteridol-PEG 1000 mixture 
                 1.09 
                 kg 
               
               
                   
                 Lot 
                 100.00 
                 kg 
               
               
                   
                   
               
             
          
         
       
     
         [0119]    The resulting mixture was formed into 5 g suppositories by a cooled compression molding technique. 
       EXAMPLE 7  
       [0120]    Vaginal Capsules 
         [0121]    The procedure substantially follows the one of Example 3 of Ref. 4, with the difference that the maltodextrin beads was first sprayed with an aqueous solution of calteridol sodium and dried in a fluid bed drier, and then sprayed with the bacterial cell matrix suspension. 
         [0122]    A preservation matrix was prepared as follow: 
         [0123]    2 parts gelatin (e.g., 137.5 g per 500 mL reagent water) and 4 parts skim milk (e.g., 15 g per 250 mL reagent water) were autoclaved at about 121° C. for about 15 min. 4 Parts xylitol (e.g., 59 g per 250 mL reagent water) and 4 parts dextrose (25 g per 250 mL reagent water) were mixed together, the mixture was adjusted to pH 7.2-7.4 and filter sterilized with a 0.22 μm filter. The sterile components were therefore combined into a single solution (gelatin base) and stored at 2-8° C. Ascorbic acid was prepared as a 5% (w/w) solution, filter-sterilized with a 0.22 μm filter and stored at −20° C. At the time of the production of the vaginal medicant, the gelatin base was melted and tempered to about 35° C. Then, the 5% (w/w) ascorbic acid was added to the gelatin base at a ratio of 1:10 to form the preservation matrix solution. 
         [0124]    A solution of calteridol (462 mg/mL reagent water) was prepared and sterilized at 121° C. for 20 min. 
         [0125]      Lactobacillus paracasei  CNCM I-1390 is grown as described in Ref. 30 at a cell density of about 5×10 9  cells/mL and a cell pellet was prepared by centrifugation for 5 min at 1400-1600 rpm. 
         [0126]    The cell pellet was resuspended in a phosphate-buffered saline and pelleted again by centrifugation. The cell pellet was resuspended in 1 part of phosphate-buffered saline and 10 parts of preservation matrix solution. The cell matrix suspension was gently mixed and maintained under continuous mixing at 35° C. 
         [0127]    To form the complete vaginal medicant, a fluid bed dryer having sterilized components was assembled for use. Maltodextrin beads (Maltrin® QD M510, Grain Processing Corporation, Muscatine, Iowa) were placed into the fluid bed dryer and dried at 33° C. until a sufficient dryness was achieved. The air pressure was then set to 14 psi, and the solution of calteridol sodium [Ca 3 (HP-DO3A) 2 ] (50 mL per kg of maltodextrin beads) was sprayed onto the beads using a peristaltic pump. The beads were allowed to dry for 30 min at about 38° C. The temperature was decreased to 33° C. and the cell matrix suspension (50 mL per kg of maltodextrin beads) was sprayed onto the beads with the aid of the peristaltic pump. After 50% of the cell matrix suspension was sprayed onto the beads, the temperature was increased to 38° C. After all the cell matrix suspension was sprayed onto the beads, the coated beads were allowed to dry at about 38° C. for about 30 min. In case, the coated maltodextrin beads may be frozen and stored as a powder. 
         [0128]    The powder was filled into gelatin capsules Type 00 to a level of about 500 mg per capsule. One capsule contains about 5×10 8  CFU of lactobacilli. 
         [0129]    The capsules may be packaged, optionally under nitrogen or vacuum, into air and vapor-tight primary packaging material. 
       EXAMPLE 8  
       [0130]    Vaginal Capsules 
         [0131]    The procedure substantially follows the one of the preceding Example 7, with the difference that the phosphate-buffered saline used in the preparation of the cell matrix suspension was modified to contain 10 mM of a small molecular weight non-proteinaceous iron chelator, preferably calteridol sodium [Ca 3 (HP-DO3A) 2 ], under reduction of the sodium chloride concentration to achieve isotonicity, i.e., about 290 mOsmol/kg. 
       EXAMPLE 9  
       [0132]    Vaginal Capsules 
         [0133]    Vaginal capsules were prepared essentially as described in present Example 8, except that  Lactobacullus paracasei  CNCM I-1390 was replaced by the  Lactobacullus crispatus  CTV-05 described in Ref. 4. 
       EXAMPLE 10  
       [0134]    Vaginal Insert 
         [0135]    The maltodextrin beads coated with  Lactobacullus paracasei  CNCM I-1390 were prepared as described in Example 14. Vaginal inserts were prepared by compression. 
       EXAMPLE 11  
       [0136]    Vaginal Tampon 
         [0137]    A lyophilized powder containing lactic acid bacteria, the chelator and the excipients was prepared. 
         [0138]    A vaginal tampon was prepared composed of an absorbent compressed, cylindrical core of tissue pulp and short rayon fibers. Maximal dryness of the core was assured by placing it in a high vacuum overnight and working in a low humidity environment. The tailing one-third was temporarily wrapped with plastic and the leading two-thirds were covered with the described powder by turning and rubbing it by hand on a flat glass surface. A non-woven cover was wrapped around the core and a withdrawal string was knotted around the core at its trailing end. The finished tampon was packaged under dry nitrogen into airtight and light-tight pharmaceutical sachet. 
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