NZ620238B2 - Novel zinc finger-like peptide compositions as potent agents in cancer prevention and treatment - Google Patents

Abstract

Disclosed is the use of a zinc finger-like peptide comprising: at least seven amino acids, wherein the sequence of the at least seven amino acids has 85-100% identity to a sequence represented by RRSSSCK, in the manufacture of a medicament for treating cancer in a patient in need thereof, wherein the cancer does not comprise skin cancer, and the medicament is to be administered via intravenous injection. the cancer does not comprise skin cancer, and the medicament is to be administered via intravenous injection.

Description

NOVEL ZINC FINGER-LIKE PEPTIDE COMPOSITIONS AS POTENT AGENTS IN CANCER PREVENTION AND TREATMENT CROSS REFERENCE TO RELATED APPLICATION This application claims the benefits of the Taiwan Patent Application Serial Number 100124615, filed on July 12, 2011, the subject matter of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zinc finger-like peptide for treating cancer, a pharmaceutical composition containing the zinc finger-like peptide and a method for treating cancer. 2. Description of Related Art Foods or food additives, and environmental pollutions have been a source of contention as a cause or catalyst for promoting cancer in recent years. Not coincidentally, the same event is happening as well in the developed countries and around the world, positing as an alarming sign that the incidence rates of cancers are quite high. According to the data published by the American Cancer Society, cancer is being proved to be the most significant threat to public health.

The general methods for treating cancer include surgery, radiotherapy, chemotherapy and immune therapy. In recent years, the development of several therapeutic agents has lead to cancer treatments through new anti-cancer mechanisms, and it has been proven that the survival rate of patients can be increased by treating them with these therapeutic agents. Generally, the therapeutic agents can treat cancers through inhibition of cell cycle progression, angiogenesis, farnesyl transferase, and tyrosine kinases.

Although it is known that certain agents exhibit therapeutic effects on cancer, these agents do have their limitations. For example, “Gefitinib” is a drug for inhibiting non-small cell lung cancer, but it fails to cure in most cases. Also, it has no effects on blocking the progression of breast and colorectal cancers. In addition, the therapeutic effects of the anti-cancer drugs also depend on the locations of tumor cells, genetic variations of patients, and the side effects of drugs.

Furthermore, cancer cells may become malignant and spread from its original sites to target organs via the lymphatic system or bloodstream, thereby establishing metastatic cancers.

Since the risk of developing cancer generally increases with age, the occurrence rates of cancer go up as more people live to an old age and as mass lifestyle changes. Hence, there is a long unfulfilled need to provide new agents for cancer treatment and prevention. It is an object of the present invention to go some way towards meeting this need and/or to provide the public with a useful choice.

SUMMARY OF THE INVENTION In a first aspect the invention provides a use of a zinc finger-like peptide comprising: at least seven amino acids, wherein the sequence of the at least seven amino acids has 85-100% identity to a sequence represented by SEQ ID NO: 1, in the manufacture of a medicament for treating cancer in a patient in need thereof, wherein the cancer does not comprise skin cancer, and the medicament is to be administered via intravenous injection.

Also described is a pharmaceutical composition for treating cancer, comprising: an effective amount of a zinc finger-like peptide, wherein the zinc finger-like peptide comprises at least seven amino acids, wherein the sequence of the at least seven amino acids has 85-100% identity to a sequence represented by SEQ ID NO: 1; and a pharmaceutically acceptable carrier.

Also described is a zinc finger-like peptide, a pharmaceutical composition containing the zinc finger-like peptide and a method for treating cancer, which can be used to treat cancer.

Also described is a zinc finger-like peptide expression plasmid, a pharmaceutical composition containing the zinc finger-like peptide and a method for treating cancer, wherein the zinc finger-like peptide expression plasmid can express a zinc finger-like peptide for treating cancer.

The zinc finger-like peptide for treating cancer comprises: at least seven amino acids, wherein the sequence of the at least seven amino acids has 85-100% similarity to a sequence represented by SEQ ID NO: In addition, the zinc finger-like peptide expression plasmid for treating cancer comprises: a DNA sequence for expressing the aforementioned zinc finger-like peptide.

In another embodiment, the zinc finger-like peptide for treating cancer comprises: at least seven amino acids, wherein the sequence of the at least seven amino acids has 50-100% similarity to a sequence represented by SEQ ID NO: 1 (RRSSSCK).

In addition, the zinc finger-like peptide expression plasmid for treating cancer comprises: a DNA sequence for expressing the aforementioned zinc finger-like peptide, which has 70-100% identity to a sequence represented by SEQ ID NO: 3 (agaaggtcgt cttcttgtaa a).

Also described is a zinc finger-like peptide, which is a small molecule peptide similar to a zinc finger motif. The amino-acid length of the peptide is not particularly limited, and the peptide can be constituted of 4-200 amino acids. Preferably, the peptide contains 4-100 amino acids. More preferably, the peptide contains 5-70 amino acids. Most preferably, the peptide contains 6-45 amino acids.

Particularly preferably, the peptide contains 7-15 amino acids. The zinc finger-like peptide for treating cancer comprises at least seven amino acids, wherein the sequence of the at least seven amino acids may have 50-100% similarity to a sequence represented by SEQ ID NO: 1.

Preferably, the sequence of the at least seven amino acids has 70-100% similarity to a sequence represented by SEQ ID NO: 1. More preferably, the sequence of the at least seven amino acids has 85-100% similarity to a sequence represented by SEQ ID NO: 1. In addition, the sequence of the at least seven amino acids may have 50-100% identity to a sequence represented by SEQ ID NO: 1. Preferably, the sequence of the at least seven amino acids has 70-100% identity to a sequence represented by SEQ ID NO: 1. More preferably, the sequence of the at least seven amino acids has 85-100% identity to a sequence represented by SEQ ID NO: 1.

Most preferably, the sequence of the zinc finger-like peptide is SEQ ID NO: 1.

The zinc finger-like peptide described herein may have 50-100% similarity to a sequence represented by SEQ ID NO: 2 (MSSRRSSSCKYCEQDFRAHTQKNAATPFLAN). Preferably, the zinc finger-like peptide has 70-100% similarity to a sequence represented by SEQ ID NO: 2. More preferably, the zinc finger-like peptide has 80-100% similarity to a sequence represented by SEQ ID NO: 2. In addition, the zinc finger-like peptide may have 50-100% identity to a sequence represented by SEQ ID NO: 2. Preferably, the zinc finger-like peptide has 70-100% identity to a sequence represented by SEQ ID NO: 2. Most preferably, the zinc finger-like peptide has 80-100% identity to a sequence represented by SEQ ID NO: 2.

The DNA sequences shown in SEQ ID NOs: 3 and 4 are respectively coded into the amino acid sequences shown in SEQ ID NOs: 1 and 2. The DNA sequences shown in SEQ ID NO 4 is listed as the following: atgagcagca gaaggtcgtc ttcttgtaaa tattgtgaac aggacttccg agcacacaca cagaagaatg cggccacacc cttcctagcc aac. In the present invention, cDNA having DNA sequences shown in SEQ ID NO: 3 or 4 can be inserted into a vector to obtain the zinc finger-like peptide expression plasmid, which can express peptide having amino acid sequence shown in SEQ ID NO: 1 or 2 in vitro or in vivo.

The sequence of the aforementioned zinc finger-like peptide can be derived from any zinc finger-like peptide of different species.

Preferably, the zinc finger-like peptide described herein is derived from human or mouse. In addition, the zinc finger-like peptide may be obtained through peptide synthesis, or expression of cDNA of zinc finger-like peptide from human or mouse. In one aspect the zinc finger-like peptide described herein is obtained through peptide synthesis.

The expression plasmid described herein can be any plasmid capable of expressing the zinc finger-like peptide described herein. Preferably, the expression plasmid used herein is pCR3.1 (available from Invitrogen) or pEGFPC1 (available from Clontech). The host for the zinc finger-like peptide described herein is not particularly limited, as long as it can express the cDNA inserted into the vector. Examples of the host may include: bacteria, mammalian cells or tumor cells. Preferably, the zinc finger-like peptide expression plasmid described herein is transfected into mammalian cells or tumor cells to express the zinc finger-like peptide.

In addition, the zinc finger-like peptide described herein may have 50-100% similarity to a sequence represented by SEQ ID NO: 8 (MSSRRSSSCKYCEQD). Preferably, the zinc finger-like peptide has 70-100% similarity to a sequence represented by SEQ ID NO: 8. More preferably, the zinc finger-like peptide has 80-100% similarity to a sequence represented by SEQ ID NO: 8. In addition, the zinc finger-like peptide may have 50-100% identity to a sequence represented by SEQ ID NO: 8. Preferably, the zinc finger-like peptide has 70-100% identity to a sequence represented by SEQ ID NO: 8. Most preferably, the zinc finger-like peptide has 80-100% identity to a sequence represented by SEQ ID NO: 8. Most preferably, the sequence of the zinc finger-like peptide is SEQ ID NO: 8.

Furthermore, the zinc finger-like peptide described herein may have 50-100% similarity to a sequence represented by SEQ ID NO: 9 (FRAHTQKNAATPFLAN). Preferably, the zinc finger-like peptide has 70-100% similarity to a sequence represented by SEQ ID NO: 9. More preferably, the zinc finger-like peptide has 80-100% similarity to a sequence represented by SEQ ID NO: 9. In addition, the zinc finger-like peptide may have 50-100% identity to a sequence represented by SEQ ID NO: 9. Preferably, the zinc finger-like peptide has 70-100% identity to a sequence represented by SEQ ID NO: 9. Most preferably, the zinc finger-like peptide has 80-100% identity to a sequence represented by SEQ ID NO: 9. Most preferably, the sequence of the zinc finger-like peptide is SEQ ID NO: 9.

In the present invention, the term “similarity” refers to the percentage of the similar amino acid residues between two sequences, which is defined by the chemical similarity of amino acids. For example, alanine, valine, leucine and isoleucine are similar amino acid residues with saturated hydrocarbon groups; phenylalanine, tyrosine, tryptophan and histidine are similar amino acid residues with aromatic groups; aspartic acid, asparagine, glutamic acid and glutamine are similar amino acid residues with carboxyl groups and amide groups; lysine and arginine are similar amino acid residues with amino groups; serine and threonine are similar amino acid residues with alcoholic groups; and methionine and cysteine are similar amino acid residues with thio-groups. In addition, the term “identity” refers to the percentage of the identical amino acid residues between two sequences.

In the zinc finger-like peptide containing at least seven amino acids described herein, the sequence thereof may contain at least two duplicate amino acid residues with similar chemical properties. For example, the sequence thereof may contain at least two duplicate hydrophilic amino acid residues such as aspartic acid, glutamine, serine, threonine, or cysteine; at least two duplicate amino acid residues with alcoholic groups, such as threonine, serine or tyrosine; or at least two duplicate amino acid residues with thio-groups such as cysteine. In the present invention, the zinc finger-like peptide described herein at least contains two cysteine and one histidine to form a zinc finger-like peptide with C2H2 motif.

In addition, the zinc finger-like peptide expression plasmid described herein may further comprise a vector connecting to the DNA sequence for expressing the zinc finger-like peptide of the present invention. The type of the vector is not particularly limited by number, and can be any vector generally used in the art. For example, the vector may be derived from pEGFP or pECFP, which is generally used to transfect into mammalian cells such as human cell lines for expressing inserted cDNAs.

Furthermore, the zinc finger-like peptide or the expression plasmid described herein may be encapsulated into liposome. Preferably, the expression plasmid is co-transfected into hosts with liposome to express the zinc finger-like peptide.

The zinc finger-like peptide described herein has similar structure to zinc-finger motif. In addition, the peptide described herein may selectively contain several duplicate amino acid residues with similar chemical properties or several duplicate identical amino acid residues to form a peptide motif with specific bondings.

Furthermore, the zinc finger-like peptide can self-polymerize without adding any catalytic agents. The zinc finger-like peptide described herein also can bind to proteins related to apoptosis. Hence, it can inhibit the growth of tumor cells, and can be used to treat or prevent cancers.

Also described is a pharmaceutical composition for treating cancer, which comprises: an effective amount of the aforementioned zinc finger-like peptide or zinc finger-like peptide expression plasmid; and a pharmaceutically acceptable carrier.

Also described is a method for treating cancer, which comprises: administering the aforementioned zinc finger-like peptide, the aforementioned zinc finger-like peptide expression plasmid, or the aforementioned pharmaceutical composition to a subject in need thereof.

The zinc finger-like peptide described herein may be applied to various cancers, such as bladder cancer, bone cancer, brain cancer, breast cancer, cervical caner, colon cancer, endometrial cancer, esophageal cancer, leukemia, liver cancer, lymphoma, kidney cancer, osteosarcoma, ovarian cancer, pancreatic cancer, prostate cancer, skin cancer including basal and squamous cell carcinoma and melanoma, small intestine cancer, stomach cancer, thymus cancer and thyroid cancer, but the scope of applicability described herein is not limited thereto.

Preferably, the zinc finger-like peptide described herein is used to treat breast cancer, colon cancer, esophageal cancer, leukemia, lymphoma, liver cancer, lung cancer, ovarian cancer, pancreatic cancer, prostate cancer, skin cancer, stomach cancer or thyroid cancer. More preferably, the zinc finger-like peptide described herein is used to treat breast cancer, colon cancer, lung cancer, lymphoma, prostate cancer or skin cancer. Most preferably, the zinc finger-like peptide of the present invention is used to treat brain cancer, breast cancer, prostate cancer or skin cancer.

The zinc finger-like peptide described herein can inhibit proliferation, growth, invasion and metastasis of tumor cells.

The zinc finger-like peptide and the pharmaceutical composition for treating cancer described herein can be administered via parenteral, inhalation, local, rectal, nasal, sublingual, or vaginal delivery, or implanted reservoir. Herein, the term “parenteral delivery” includes subcutaneous, intradermic, intravenous, intra-articular, intra-arterial, synovial, intrapleural, intrathecal, local, and intracranial injections.

According to the pharmaceutical composition described herein, the term “pharmaceutically acceptable carrier” means that the carrier must be compatible with the active ingredients (and preferably, capable of stabilizing the active ingredients) and not be deleterious to the subject to be treated. The carrier may be at least one selected from the group consisting of active agents, adjuvants, dispersants, wetting agents and suspending agents. The example of the carrier may be microcrystalline cellulose, mannitol, glucose, non-fat milk powder, polyethylene, polyvinylprrolidone, starch or a combination thereof.

In addition, the term “treating” used herein refers to the application or administration of the zinc finger-like peptide or the pharmaceutical composition containing the zinc finger-like peptide to a subject with symptoms or tendencies of suffering from cancer in order to cure, heal, alleviate, relieve, alter, remedy, ameliorate, improve, prevent or affect the symptoms or tendencies of cancers. Furthermore, “an effective amount” used herein refers to the amount of each active ingredients such as the zinc finger-like peptide required to confer therapeutic effect on the subject. The effective amount may vary according to the route of administration, excipient usage, and co-usage with other active ingredients.

The term “comprising” as used in this specification and claims means “consisting at least in part of”. When interpreting statements in this specification, and claims which include the term “comprising”, it is to be understood that other features that are additional to the features prefaced by this term in each statement or claim may also be present. Related terms such as “comprise” and “comprised” are to be interpreted in similar manner.

Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS is a curve representing the tumor volumes of mice in the experimental group according to Example 1 of the present invention; is a curve representing the tumor volumes of mice in the control group according to Example 1 of the present invention; shows curves representing the tumor volumes of mice according to Example 2 of the present invention; is a curve representing the tumor volumes of mice in the experimental group according to Example 3 of the present invention; is a curve representing the tumor volumes of mice in the control group according to Example 3 of the present invention; shows curves representing the tumor volumes of mice according to Example 4 of the present invention; shows curves representing the tumor volumes of mice according to Example 5 of the present invention; is a curve representing the tumor volumes of mice in the experimental group according to Example 6 of the present invention; is a curve representing the tumor volumes of mice in the control group according to Example 6 of the present invention; is a curve representing the tumor volumes of mice in the experimental group according to Example 7 of the present invention; is a curve representing the tumor volumes of mice in the control group according to Example 7 of the present invention; shows curves representing the tumor volumes of mice according to Example 8 of the present invention; is a curve representing the tumor volumes of mice in the experimental group according to Example 9 of the present invention; is a curve representing the tumor volumes of mice in the control group according to Example 9 of the present invention; A is a curve representing the tumor volumes of mice in the experimental group according to Example 10 of the present invention; B is a curve representing the tumor volumes of mice in the control group according to Example 10 of the present invention; A is a curve representing the tumor volumes of mice in the control group according to Example 11 of the present invention; B is a curve representing the tumor volumes of mice in the experimental group 1 according to Example 11 of the present invention; C is a curve representing the tumor volumes of mice in the experimental group 1 according to Example 11 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The DNA sequence and the amino acid sequence of the zinc finger-like peptide used in the following examples are listed in the following table 1.

Table 1.

SEQ ID NO: DNA/amino acid sequence SEQ ID NO: 1 RRSSSCK SEQ ID NO: 2 MSSRRSSSCKYCEQDFRAHTQKNAATPFLAN SEQ ID NO: 3 agaaggtcgt cttcttgtaa a SEQ ID NO: 4 atgagcagca gaaggtcgtc ttcttgtaaa tattgtgaac aggacttccg agcacacaca cagaagaatg cggccacacc cttcctagcc aac SEQ ID NO: 5 MSSRRSSGCKYCEQD (serine mutation) SEQ ID NO: 6 RSSSCK (cysteine deletion) SEQ ID NO: 7 atgagcagca gaaggtcgtc tggctgtaaa tattgtgaac aggacttccg agcacacaca cagaagaatg cggccacacc cttcctagcc aac SEQ ID NO: 8 MSSRRSSSCKYCEQD SEQ ID NO: 9 FRAHTQKNAATPFLAN In the following examples, 8-week nude mice were used as host subjects to perform in vivo experiments. The nude mice were placed in room temperature and suitable humidity, and supplied with sterile water and standard food for 2 consecutive weeks before performing experiments. Then, the nude mice were injected with zinc finger-like peptide and tumor cells. The detailed processes for the experiments are described as follows.

First, manually synthesized zinc finger-like peptide (Genemed Synthesis Inc., San Antonio, TX, USA) was resuspended in degassed purified water to obtain 1-5 mM of zinc finger-like peptide solution (100 μl). Herein, the solution for suspending the zinc finger-like peptide is not particularly limited. Preferably, the zinc finger-like peptide is resuspended in degassed purified water, in order to prevent the self-polymerization of the zinc finger-like peptide and loss its ability to inhibit tumor cell growth.

[Example 1] Experimental group Herein, zinc finger-like peptide with sequence shown in SEQ ID NO: 2 was injected into nude mice.

In particularly, nude mice were injected with an intravenous injection of peptide (2 mM, 100 μl phosphate-buffered saline or PBS) via tail veins per week for 3 consecutive weeks, followed by inoculating basal cell carcinoma (BCC) cells (2 million cells / 100 μl PBS) at both the right and left flanks. The tumor volumes (mm ) were observed daily during the whole experiment. The result is shown in , which is a curve representing the tumor volumes of mice.

Control group The process of the present control group was the same as that of the experimental group, except that the zinc finger-like peptide of the experimental group was substituted with PBS buffer (100 μl) in the present control group. The result is shown in , which is a curve representing the tumor volumes of mice.

As shown in and , the zinc finger-like peptide can inhibited the growth of skin cancer cell on nude mice when the mice were pre-injected with zinc finger-like peptide (experimental group).

However, the tumor volumes of mice without injection of zinc finger-like peptide (control group) were much larger than those of the experimental group. These results indicate that the zinc finger-like peptide is effective on treating and preventing skin basal cell carcinoma.

[Example 2] Experimental group 1 In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 1 was injected into nude mice.

Nude mice were injected with an intravenous injection of peptide (2 mM, 100 μl PBS) via tail veins per week for 3 consecutive weeks, followed by inoculating BCC cells (2 million cells / 100 μl PBS) at both the right and left flanks. 2 months later, boost injection of peptide was carried out per week for 3 consecutive weeks. The tumor volumes (mm ) were daily observed during the whole experiment.

Experimental group 2 The process of the present experimental group was the same as that of the experimental group 1, except that the zinc finger-like peptide with sequence shown in SEQ ID NO: 1 of the experimental group 1 was substituted with zinc finger-like peptide with sequence shown in SEQ ID NO: 5 in the present experimental group.

Control group The process of the present control group was the same as that of the experimental group 1, except that the zinc finger-like peptide of the experimental group 1 was substituted with H O (100 μl) in the present control group.

The results of the present example are shown in which shows curves representing the tumor volumes of mice of the experimental group 1, the experimental group 2 and the control group of the present example. As shown in the zinc finger-like peptide with sequence shown in SEQ ID NO: 1 (experimental group 1) can prevent and inhibit the growth of cancer cell, and has effect on skin cancer treatment. However, when the fifth amino acid, serine of SEQ ID NO: 1 is replaced with glycine (i.e. the zinc finger-like peptide with sequence shown in SEQ ID NO: 5), the therapeutic effect of the zinc finger-like peptide is decreased. However, the zinc finger-like peptide used in the experimental group 2 still has better treatment effect than H O used in the control group.

[Example 3] Experimental group Herein, zinc finger-like peptide with sequence shown in SEQ ID NO: 1 is injected into nude mice.

With this experimental group, nude mice received an intravenous injection of peptide (2 mM, 100 μl sterile water) via tail veins per week for 3 consecutive weeks, followed by inoculation of malignant melanoma B16F10 (2 million cells / 100 μl PBS) at both the right and left flanks. The tumor volumes (mm ) were observed daily during the whole experiment. Shown in is the result representing the tumor volumes of mice of the present experimental group.

Control group The process of the present control group was the same as that of the experimental group, except that the zinc finger-like peptide of the experimental group was substituted with HO (100 μl) in the present control group. The result is shown in , which is a curve representing the tumor volumes of mice of the present control group.

As shown in and , the zinc finger-like peptide can inhibit the growth of skin melanoma on nude mice when the mice were pre-injected with zinc finger-like peptide (experimental group).

However, the tumor volumes of mice without injection of zinc finger-like peptide (control group) were much larger than those of the experimental group. These results indicate that the zinc finger-like peptide exhibit dramatic effects on treating and preventing malignant melanoma.

[Example 4] Nude mice received an intravenous injection of peptide (2 mM, 100 μl) via tail veins per week for 2 consecutive weeks, followed by inoculating malignant melanoma B16F10 (2 million cells / 100 μl PBS) at both the right and left flanks. The tumor volumes (mm ) were observed daily during the whole experiment.

Experimental group 1 In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 1 was injected into nude mice.

Experimental group 2 In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 1, in which the fifth amino acid, serine was phosphorylated, and injected into nude mice.

Experimental group 3 In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 6 was injected into nude mice.

Experimental group 4 In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 6, in which the fourth amino acid serine was phosphorylated, and injected nude mice.

Control group In the control group, H O (100 μl) was injected into nude mice.

The results of the present example are shown in which shows curves representing the tumor volumes of mice of the experimental groups 1-4 and the control group of the present example.

As shown in the nude mice of the experimental group 3 died on st th 31 day, and those of the experimental groups 2 and 4 died on 35 day.

These results indicate that the zinc finger-like peptide with sequence shown in SEQ ID NO: 1 (the experimental group 1) can effectively inhibit the growth of tumor cells. In addition, the skin cancer was completely cured after 115 days, and therefore the zinc finger-like peptide with sequence shown in SEQ ID NO: 1 has effect on skin cancer treatment. Furthermore, according to the results of the experimental groups 2-4, the activities of the zinc finger-like peptide on skin cancer treatment were reduced by phosphorylation of serine or deletion of cyctine of zinc finger-like peptide.

[Example 5] The cDNA of zinc finger-like peptide was inserted into vector pCR3.1/CMV to form a zinc finger-like peptide expression plasmid, wherein the zinc finger-like peptide was connected to the c-terminal of EGFP.

Experimental group 1 In the present experimental group, the zinc finger-like peptide expression plasmid containing DNA sequence for expressing the zinc finger-like peptide (SEQ ID NO: 4) (100 μl) was injected into nude mice via tail veins per week for 2 consecutive weeks, to express zinc finger-like peptide. Then, BCC cells (2 million cells / 100 μl medium) were inoculated into nude mice at both the right and left flanks. The tumor volumes (mm ) were observed daily during the whole experiment.

Experimental group 2 The process of the present experimental group was the same as that of the experimental group 1, except that the DNA sequence shown in SEQ ID NO: 4 was substituted with DNA sequence shown in SEQ ID NO: 7.

Control group The process of the present control group was the same as that of the experimental group 1, except that the zinc finger-like peptide expression plasmid was substituted with vector containing EGFP only.

The results of the present example are shown in which shows curves representing the tumor volumes of mice of the experimental groups 1-2 and the control group of the present example.

As shown in the growth of tumor cells can be inhibited and the volume thereof can be reduced, when the zinc finger-like peptide expression plasmid containing DNA sequence shown in SEQ ID NO: 4 (experimental group 1) was injected into nude mice. Hence, the zinc finger-like peptide expression plasmid exhibits ability to treat skin cancer. Although the zinc finger-like peptide expression plasmid containing DNA sequence shown in SEQ ID NO: 7 (experimental group 2) cannot effectively terminate the growth of tumor cells, it can slightly inhibit the growth of the tumor cells. These results indicate that serine in the zinc finger-like peptide plays an important role on the cancer treatment.

[Example 6] Experimental group In the present experimental group, zinc finger-like peptide with sequences shown in SEQ ID NO: 8 and 9 was injected into nude mice.

Nude mice received an intravenous injection of peptide (2 mM, 100 μl) via tail veins per week for 4 consecutive weeks, followed by inoculating breast adenocarcinoma MDA-MB-231 (2 million cells / 100 th th μl medium) at both the right and left flanks on 40 day and 85 day. The tumor volumes (mm ) were observed daily during the whole experiment.

The result is shown in , which is a curve representing the tumor volumes of mice.

Control group The process of the present control group was the same as that of the experimental group, except that the zinc finger-like peptide of the experimental group was substituted with HO (100 μl) in the present control group. The result is shown in , which is a curve representing the tumor volumes of mice.

As shown in , when the nude mice were injected with peptide and followed by inoculating breast tumor cells (experimental group), the growth and proliferation of tumor cells were not observed at both the left and right flanks. However, as shown in , the tumor volumes of the nude mice in the control group were increased to 1000 times at both the left and right flanks on the 161 day. These results indicate that the zinc finger-like peptide exhibit effects on treating and preventing breast adenocarcinoma.

In addition, there are no side effects on the nude mice injected with the zinc finger-like peptide 1.5 years layer. Hence, the zinc finger-like peptide exhibits low side effect and has ability to prevent the growth of breast tumor cells.

[Example 7] Experimental group In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 1 was injected into nude mice.

Nude mice were injected with an intravenous injection of peptide (3 mM, 100 μl) via tail veins per week for 3 consecutive weeks, followed by inoculating breast carcinoma MDA-MB-468 (2 million cells / 100 μl medium) at both the right and left flanks. The tumor volumes (mm ) were observed daily during the whole experiment. The result is shown in , which is a curve representing the tumor volumes of mice.

Control group The process of the present control group was the same as that of the experimental group, except that the zinc finger-like peptide of the experimental group as substituted with HO (100 μl) in the present control group. The result is shown in , which is a curve representing the tumor volumes of mice.

As shown in , when the nude mice were injected with peptide and followed by inoculating breast tumor cells (experimental group), the growth and proliferation of tumor cells were not observed at both the left and right flanks. However, as shown in , the tumor volumes of the nude mice in the control group were increased to 200-500 times at both the left and right flanks on the 91 day. These results indicate that the zinc finger-like peptide exhibit effects on treating and preventing breast carcinoma.

[Example 8] Experimental group In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 2 was injected subcutaneously into nude mice.

Nude mice received an injection of breast carcinoma MDA-MB-435s (2 million cells / 100 μl PBS) via tail veins at both the right and left flanks on the 1 day, followed by injecting peptide (2 mM, 100 μl) per week for 4 consecutive weeks from the 70 day. The tumor volumes (mm ) were observed daily during the whole experiment.

Control group The process of the present control group was the same as that of the experimental group, except that the zinc finger-like peptide of the experimental group was substituted with PBS buffer (100 μl) in the present control group.

The results of the present example are shown in which shows curves representing the tumor volumes of mice of the experimental groups 1-2 and the control group of the present example.

The tumor volumes in the experimental group were significantly increased from the 89 day, and the maximum tumor volumes were th 3 observed on the 100 day (1000 mm ). Then, the tumor volumes were reduced to 50% on the 113 day. However, the tumor volumes in the control group were significantly increased from the 80 day, 3 th and increased to 4000 times (4000 mm ) on the 105 day. Although the tumor volumes in the experimental group were increased, the zinc finger-like peptide used therein can still terminate 75% tumor cell growth compared to the control group. Hence, the zinc finger-like peptide can be used to treat breast cancer.

[Example 9] Experimental group In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 1 was injected into nude mice.

Nude mice were injected with an intravenous injection of peptide (2 mM, 100 μl) via tail veins per week for 3 consecutive weeks, followed by inoculating malignant prostate cancer DU145 cells (2 million cells / 100 μl medium) at both the right and left flanks three months later. The tumor volumes (mm ) were observed daily during the whole experiment. The result is shown in , which is a curve representing the tumor volumes of mice.

Control group The process of the present control group was the same as that of the experimental group, except that the zinc finger-like peptide of the experimental group was substituted with HO (100 μl) in the present control group. The result is shown in , which is a curve representing the tumor volumes of mice.

As shown in , when the nude mice were injected with peptide and followed by incoluation of prostate tumor cells (experimental group), the growth and proliferation of tumor cells were not observed at both the left and right flanks. In addition, there is a 3-month resting period after peptide treatment prior to challenge with tumor cells, suggesting that zinc finger-like peptide could provide a long-term protection against cancer.

However, as shown in and , the implanted tumor cells in the control group without peptide injection proliferated at both the right and left flanks, and the tumor volumes of the control group were much lager than those of the experimental group.

[Example 10] Experimental group In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 1 was injected into nude mice.

Nude mice were injected with an intravenous injection of peptide (2 mM, 100 μl) via tail veins per week for 3 consecutive weeks, followed by inoculating prostatic epithelial cells PZ-HPV-7 (2 million cells / 100 μl medium) at both the right and left flanks on the 20 th 3 day and the 90 day. The tumor volumes (mm ) were observed daily during the whole experiment. The result is shown in A, which is a curve representing the tumor volumes of mice.

Control group The process of the present control group was the same as that of the experimental group, except that the zinc finger-like peptide of the experimental group was substituted with HO (100 μl) in the present control group. The result is shown in B, which is a curve representing the tumor volumes of mice.

As shown in A, when the nude mice were injected with peptide and followed by inoculating prostate tumor cells (experimental group), the growth and proliferation of tumor cells were not observed at both the left and right flanks. However, as shown in B, the implanted tumor cells in the control group without peptide injection were proliferated at both the right and left flanks.

Hence, the zinc finger-like peptide can be used to treat prostate cancer, terminate the growth of tumor cells, and obtain the purpose of cancer prevention.

[Example 11] Control group The process of the present control group was the same as that of the experimental group, except that the zinc finger-like peptide of the experimental group was substituted with HO (100 μl) in the present control group. The result is shown in A, which is a curve representing the tumor volumes of mice.

Experimental group 1 In the present experimental group, zinc finger-like peptide with sequence shown in SEQ ID NO: 1 was injected into nude mice.

Nude mice were injected with an intravenous injection of peptide (2 mM, 100 μl) via tail veins per week for 3 consecutive weeks, followed by inoculating malignant glioma U87-MG cells (2 million cells / 100 μl medium) at both the right and left flanks 1 month later. The tumor volumes (mm ) were observed daily during the whole experiment.

The result is shown in B, which is a curve representing the tumor volumes of mice.

Experimental group 2 The process of the present control group was the same as that of the experimental group 1, except that the concentration of the zinc finger-like peptide is 4 mM. The result is shown in C, which is a curve representing the tumor volumes of mice.

As shown in A to C, when the nude mice were injected with peptide and followed by inoculating brain tumor cells (experimental groups 1 and 2), the growth and proliferation of tumor cells were slower than that observed in the control group. In addition, the suppression on tumor cell growth was getting significant as the concentration of the zinc finger-like peptide increased.

The aforementioned results indicate that the zinc finger-like peptide or the zinc finger-like peptide expression plasmid can inhibit the growth and the proliferation of tumor cells, and thus has potential for cancer treatment and prevention.

Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.

In this specification where reference has been made to patent specifications, other external documents, or other sources of information, this is generally for the purpose of providing a context for discussing the features of the invention. Unless specifically stated otherwise, reference to such external documents is not to be construed as an admission that such documents, or such sources of information, in any jurisdiction, are prior art, or form part of the common general knowledge in the art.

In the description in this specification reference may be made to subject matter that is not within the scope of the claims of the current application. That subject matter should be readily identifiable by a person skilled in the art and may assist in putting into practice the invention as defined in the claims of this application.

Claims (8)

WHAT WE CLAIM IS:

1. A use of a zinc finger-like peptide comprising: at least seven amino acids, wherein the sequence of the at least seven amino acids has 85-100% identity to a sequence represented by SEQ ID NO: 1, in the manufacture of a medicament for treating cancer in a patient in need thereof, wherein the cancer does not comprise skin cancer, and the medicament is to be administered via intravenous injection.

2. The use as claimed in claim 1, wherein the sequence of the at least seven amino acids is SEQ ID NO: 1.

3. The use as claimed in claim 1, wherein the sequence of the zinc finger-like peptide is SEQ ID NO: 1.

4. The use as claimed in claim 1, wherein the sequence of the zinc finger-like peptide has 80-100% similarity to a sequence represented by SEQ ID NO: 2.

5. The use as claimed in claim 1, wherein the sequence of the zinc finger-like peptide is SEQ ID NO: 2.

6. The use as claimed in claim 1, wherein the mediciament further comprises a pharmaceutically acceptable carrier.

7. The use as claimed in claim 6, wherein the pharmaceutically acceptable carrier is at least one selected from the group consisting of: activators, excipients, adjuvants, dispersants, wetting agents, and suspensions.

8. The use as claimed in claim 1, wherein the cancer is bladder cancer, bone cancer, brain cancer, breast cancer, cervical cancer, colon cancer, endometrial cancer,