An anti-tumor pharmaceutical composition comprises the conjugation of Canavalia ensiformis-extracted protein with metal ions to form a metalloprotein complex for inhibiting the growth of tumor with enhanced activity and stability, but without toxicity.

BACKGROUND OF THE INVENTION

There are many ways for treating cancer. Besides the surgery to remove malignant tumor for treating cancer, a chemotherapy or radiation therapy may be applied for the treatment of cancer. However, it will incur side effects to hurt the patient.

It is known that many compositions are derived from Chinese herbal medicines, medicinal plants and extracts thereof for treating cancers. Nevertheless, a single plant extract without being conjugated with other effective ingredients, its anti-tumor effect is still unsatisfactory.

The present inventor has found these phenomena and invented the present anti-tumor composition by conjugating Canavalia ensiformis -extracted protein with metal ions.

SUMMARY OF THE INVENTION

The object of the present invention is to provide an anti-tumor pharmaceutical composition comprising the conjugation of Canavalia ensiformis -extracted protein with metal ions to form a metalloprotein complex for inhibiting the growth of tumor with enhanced activity and stability, but without toxicity.

DETAILED DESCRIPTION

For preparing the anti-tumor pharmaceutical composition of the present invention, the following steps of the preparation procedure may be applied:

1. Fresh seeds of Canavalia ensiformis as planted in Taiwan, 10 grams, are obtained for water-washing, soaking in the water and drying in the air.

2. The dried seeds were then ground into fine powder and lipids were extracted with 100 ml of hexane for 10 minutes. The solvent is then decanted and the precipitate is collected for next treatment.

3. The precipitate is then dissolved in 100 ml of pure water (pH: 7) and stirred for 30 minutes at the temperature ranging from 0 C. to room temperature to obtain an aqueous solution containing the Canavalia ensiformis protein.

1. The aqueous solution is settled for 30 60 minutes to precipitate any impurity residue which is then removed. Such an aqueous solution is then filtered to remove any residue through a filtration membrane, e.g., 0.22 m milipore membrance to obtain a crude solution of Canavalia ensiformis -extracted protein from the filtrate.

2. Magnesium oxide (MgO), or calcium chloride (CaCl 2 ) or aluminum hydroxide (Al(OH) 3 ) were mixed with the solution of crude water extract of Canavalia ensiformis protein under agitation for four hours to obtain the metalloprotein complex solution. Pure water was added to adjust protein concentration to 1 mg protein/1 ml of metallocomplex solution for oral administration. MgO. CaCl 2 and Al(OH) 3 can also be used when mixed in a weight ratio 1:1:1.

Such group of metallic-ion containing compounds include metallic ions of aluminum ion (Al ), magnesium ion (Mg ) and calcium ion (Ca ). When mixing the metallic-ion containing compounds (of which the weight may be designated as Wi) with the crude solution of Canavalia ensiformis -extracted protein (of which the weight may be designated as Wp) for making the complex solution, the following mixing ratio may be considered:

3. The metalloprotein complex solution is lyophilized by a lyophilizer to obtain crystallized complex. An excipient such as lactose may be added into the crystallized complex with a weight ratio of 3:1, i.e., 3 parts of excipient with one part of crystallized complex, thereby producing pharmaceutically acceptable powder, tablets and capsules of the Canavalia ensiformis -extracted protein conjugated with metal ions.

Conjugating the Canavalia ensiformis extract with metallic ions increases the activity and stability of the crude extract.

When the conjugate (pH>7) of this invention passing through the stomach filled with gastric acid into the intestinal canal, the metallic ions will render an active transport in cooperation with the excipient or carrier (such as lactose) to thereby increase the absorptivity of the effective ingredients of the present invention by the patient's body (e.g. the villi) to greatly inhibit the tumor growth for enhancing the anti-tumor effect.

Besides the excipient of lactose, other protein carriers such as the protein carrier existing in milk or other natural foods may be served for an effective carrier for carrying the effective ingredients of the present invention to the patient's target organs or cells for treating his or her cancer.

Although the metallic-ion compounds containing group ions of aluminum, magnesium and calcium ions as above-mentioned may be together conjugated with the Canavalia ensiformis extracted protein to effectively treat a patient's tumor, other metallic-ion compound containing single ion (without forming group of ions or plural ions) may also be conjugated with the extracted protein, not limited in this invention.

The above-mentioned examples are given for describing the present invention only, but not to limit the claiming scope of this application within the examples as described herewith. If merely feeding natural beans of Canavalia ensiformis , no anti-tumor effect has been proven.

In order to prove the medicinal effect of the present invention, a plurality of tests are performed and reported as follows:

In Vitro Test:

Four different cancer cells as listed below are respectively tested for checking their proliferation by adding therein with the aqueous solution of the crystallized complex of the present invention:

a. Cells from a primary adenocarcinoma of the human colon, SW-480 according to ATCC of USA;

Five tubes are provided each filled with 1 ml of aqueous solution of crystallized complex of the present invention and their concentrations have been adjusted for five groups as follows:

The SW-480 (colon cancer) cells, with cell number of 1 10 4 cell/ml, are transferred by pipet into wells of several well plates. Each well is then added therein with the above-prepared aqueous solution of crystallized complex of different concentrations, i.e., 1 mg/1 ml, 0.5 mg/ml, 0.25 mg/ml, 0.125 mg/ml and 0.0625 mg/ml respectively for incubation of the cancer cells. After 3 days, each group of the aqueous solution is analyzed by adding crystalviolet (0.1%) therein and by an analysis instrument such as ELISA reader to obtain the test result as shown in FIG. 1 , from which the solution with increased concentration of the crystallized complex of the present invention results in a smaller cell number, thereby proving the tumor-inhibition effect of the present invention.

The testing procedures of Example 1 are repeated by checking the cells of TSGH-8301 (bladder cancer) to obtain the test result as shown in FIG. 2 .

Testing procedures of Example 1 are repeated, but cells of MCF-7 (breast cancer) are tested to obtain the result as shown in FIG. 3 .

Example 1 is repeated, except that the LLC (lung cancer) cells are tested to have the result as shown in FIG. 4 .

B6-mice are divided into three groups, 10 mice for each group (5 male and 5 female) to be tested as follows:

Each mouse ready for test has an average weight of 20 grams.

1. Control group: each B6 mouse fed with PBS 2 ml every day.

2. Low dose group: each B6 mouse fed with 10 mg crystallized complex in 2 ml PBS every day.

3. High dose group: each B6 mouse fed with 40 mg crystallized complex in 2 ml PBS every day.

After feeding Group 1, 2, 3 from the first day through the 35th day, the respective tumor size and weight of mice are observed as follows:

There is showing no appreciable weight variation even fed with high dose.

Toxicity Test

10 rats (5 male, 5 female) average 200-250 g for each rat, 8 rats fed with 4 g crystallized complex in 4 ml normal saline, 2 rats fed with 4 ml normal saline as control group.

Observation of survival, changes in hair, skin, weight, and toxicity syndrome, proved that administrtion of the composition of the present invention has no toxic effects. Table 1 shows the result.

The present invention is prepared from a plant extract for treating cancer, causing no side effect as commonly resulted from chemotherapy or radiation therapy.

The present invention may be modified without departing from the spirit and scope of the present invention.

The basic composition may be optionally adjusted for obtaining a proper conjugating proportion range as follows:

Canavalia ensiformis extracted protein 60 98% (by weight); Metallic-ion containing compound 2 10% (by weight). Other excipients or carriers may be further added into the basic composition as above-mentioned.