Patent Application: US-8607202-A

Abstract:
the method for using matrix metalloproteinase inhibitors to prevent and treat sinusoidal obstruction syndrome . in particular , the present invention provides a method of preventing and treating chemotherapy - and radiation - induced liver disease . this invention can be given prophylatically to patients who are receiving high dose chemotherapy and / or radiation and who are at risk for sos or radiation - induced liver disease . this method may also be used to treat patients therapeutically who have developed sos or radiation - induced liver disease . because the development of chemotherapy or radiation - induced liver disease limits patient eligibility for several chemotherapeutic drugs , the present invention increases patient eligibility for many of these drugs .

Description:
all scientific terms are to be given their ordinary meanings as understood by those of skill in the art , unless an alternate meaning is set forth below . in case of conflict , the definitions set forth in this specification shall control . in the present invention , the term “ sinusoidal obstruction syndrome ” or “ sos ” is synonymous with the term “ hepatic venoocclusive disease .” in the present invention , it is disclosed that an explanation for the rounding up of sinusoidal endothelial cells may be due to increased activity of mmps . because mmps degrade extracellular matrix , increased mmp activity on the ablumenal side of the sinusoidal endothelial cell would allow the cells to let loose from the space of disse . in the experimental model , de novo synthesis of mmp - 9 ( gelatinase b ) and increased mmp - 9 activity occur 12 hours after monocrotaline , which coincides with rounding up of the sinusoidal endothelial cells . 12 inhibition of mmp activity completely prevents sos . mmp expression and activity are regulated by redox status and can be suppressed by glutathione and n - acetylcysteine . 27 - 30 thus , the protective effect of glutathione and n - acetylcysteine appears to be due to inhibition of mmp activity . the present invention extrapolates from the above model to disclose a method for using matrix metalloproteinase ( mmp ) inhibitors to prevent or treat sos and radiation - induced liver disease . the present invention discloses that doxycycline , an mmp inhibitor , completely prevented sos in a rat model and with human subjects . further experimentation showed that this was a class effect as the mmp - 2 mmp - 9 inhibitor , 2 -[( 4 - biphenylsulfonyl ) amino ]- 3 - phenyl - propionic acid ( bpp ) also completely inhibits sos . a number of other mmp inhibitors will also be effective in the prevention and treatment of sos and radiation - induced liver disease . for example , marimastat , prinomastat and rs - 130 , 830 are potent inhibitors of the mmps that are increased in the monocrotaline model of sos . cgs 27023a , solimastat , bay 12 - 9566 , ro 32 - 3555 , bms - 272591 , ilomastat , d2163 are also mmp inhibitors that could be used in humans . metastat , neovastat , and periostat also have potential therapeutic uses in treating and preventing sos and radiation - induced liver disease . as described in example i below , the protective effect of both doxycline and of 2 -[( 4 - biphenylsulfonyl ) amino ]- 3 - phenyl - propionic acid is dose - dependent , further supporting the biologic mechanism of action . in our animal model the gelatinolytic activity was greatly increased early on in hepatic venoocclusive disease and this increase in gelatinolytic activity could be attributed to mmp9 . 12 the inventors of the present invention have demonstrated that in the rat monocrotaline model , there is actin depolymerization in sinusoidal endothelial cells and that this in turn leads to increased mmp activity . 13 the causality of the actin depolymerization and increased mmp activity is confirmed by the demonstration that prevention of f - actin depolymerization prevents the monocrotaline - induced increase in matrix metalloproteinase activity . in vitro studies with the various populations of liver cells in vitro have also confirmed that the matrix metalloproteinase activity originates in the sinusoidal endothelial cell rather than in hepatocytes , kupffer cells or stellate cells . the following examples are intended to illustrate but not limit the present invention . the methods of the present invention can be further modified for uses such as the identification of drug and diagnostic therapies . the present invention provides methods for using matrix metalloproteinase inhibitors to prevent and treat chemotherapy - induced liver disease , such as sos and radiation - induced liver disease . these studies were done in an in vivo model of monocrotaline - induced hepatic venoocclusive disease which closely resembles the human disease . 8 two commercially available mmp inhibitors were tested in the in vivo rat model of hepatic venoocclusive disease : doxycycline and the mmp - 2 / mmp - 9 inhibitor , 2 -[( 4 - biphenylsulfonyl ) amino ]- 3 - phenyl - propionic acid . doxycycline , 15 mg / kg was given twice daily by gavage prior to onset of the disease and continued until the time of sacrifice . 2 -[( 4 - biphenylsulfonyl ) amino ]- 3 - phenyl - propionic acid , 200 μg / hour was infused into the portal circulation until the time of sacrifice . a systematic scoring system was devised to review all the changes associated with hepatic venoocclusive disease . the rats that were treated with the mmp inhibitors were sacrificed on day 4 , which is the time - point with most severe disease in this model of hepatic venoocclusive disease when no therapeutic interventions are used . all the livers from the rats treated with doxycycline or with 2 -[( 4 - biphenylsulfonyl ) amino ]- 3 - phenyl - propionic acid were examined blindly by a pathologist according to the scoring system and the pathologist was able to confirm an absence of hepatic venoocclusive disease with doxycycline 15 mg / kg twice daily by gavage or with 2 -[( 4 - biphenylsulfonyl ) amino ]- 3 - phenyl - propionic acid , 200 μg / hour infused intraportally by osmotic minipump ( see fig1 ). both doxycycline and 2 -[( 4 - biphenylsulfonyl ) amino ]- 3 - phenyl - propionic acid were administered at various doses : lower doses than those mentioned above provided partial protection , whereas the doses listed above completely prevented liver changes in the in vivo model of hepatic venoocclusive disease . both of these mmp inhibitors prevent hepatic venoocclusive disease in a dose - dependent manner , these showing that this is a class effect of mmp inhibitors and characteristic of mmp inhibition . in further support of the effect of mmp inhibitors , two analogues of doxycycline were tested for their ability to prevent sos , anhydrotetracycline and isochlorotetracycline . these two compounds are chemically similar to doxycycline but have little inhibitory effect on mmps . these analogues had minimal protective effect in the in vivo model ( see fig1 ). furthermore , in the animal model for hepatic venoocclusive disease , the gelatinolytic activity in liver tissue is greatly increased early on and this increase in gelatinolytic activity could be attributed to mmp9 . mmp9 mrna and mmp9 proenzyme also increase very early in the course of disease . no increased gelatinolytic activity could be found in the hepatic vein effluent indicating it is not a non - specific activity in the circulation . in this disease , as mmp9 activity increases , sinusoidal endothelial cell are rounded up resulting in the loss of sinusoidal integrity , which compromises liver microcirculation . inhibition of the initial rounding up of the sinusoidal endothelial cell by inhibition of matrix metalloproteinases prevents the whole cascade of events . it will be understood by those skilled in the art that the foregoing illustrates the presently preferred embodiments of the present invention and that modifications may be made in order to accomplish specific ends which do not depart from the spirit of the present invention which is to be limited only by the following claims . 1 . deleve l d , shulman h m , mcdonald g b . toxic injury to hepatic sinusoids : sinusoidal obstruction syndrome ( venoocclusive disease ). sem . liver dis . 2002 ; 22 ( 1 ): 623 - 38 . 2 . rajvanshi p , shulman h m , sievers e l , mcdonald g b . hepatic sinusoidal obstruction following gemtuzumab ozogamicin ( mylotarg ®). blood 2002 : in press . 3 . deleve l d . liver function and hepatotoxicity in cancer . in : holland j f , frei e , bast r c , jr ., kufe d w , pollock r e , weichselbaum r r , editors . cancer medicine . 5th ed . hamilton , ontario , canada : b . c . decker inc ; 2000 . p . chapter 151 . 4 . deleve l d . dacarbazine toxicity in murine liver cells : a novel model of hepatic endothelial injury and glutathione defense . j . pharmacol . exp . ther . 1994 ; 268 : 1261 - 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