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The cytolytic action of all-D mastoparan M on tumor cell lines
Abstract:
All-D and all-L mastoparan M, a tetradecapeptide toxin (INLKAIAALAKKLL-NH2) from hornet venom, were chemically synthesized in this study. Under circular dichroism investigation, all-D and L-mastoparan M adopted a 30% alpha-helical structure in 30% trifluroethanol solution but only a 10% á-helical structure in phosphate solution. After being added to the cultures of tumor cell lines in vitro, D-mastoparan (12.5 micrograms/ml) directly inhibited the growth of the tumor cell lines Colo 225 (59%), KB (38%), Hep-2 (63%), H226Br (43%) and HeLa (54%) determined by the MTT assay. We also found that D-mastoparan M has a higher potency of antitumor cell activity in vitro than L-mastoparan M. When examined under the scanning-beam electron microscope, hollow, shrunk and collapsed structures of tumor cells could be seen, after being mixed with D-mastoparan M. The appearance of these morphological alterations indicated that mastoparan M inhibits the growth of tumor cells by direct lysis of target cells.
Insights
D-mastoparan M, a synthetic peptide from hornet venom, effectively inhibits tumor cell growth by directly lysing cancer cells. This study demonstrates D-mastoparan M
Area of Science:
- Biochemistry and Molecular Biology
- Pharmacology and Toxicology
- Cancer Research
Background:
- Mastoparan M is a tetradecapeptide toxin isolated from hornet venom.
- Peptides from natural sources are increasingly investigated for therapeutic potential.
- Understanding the structure-activity relationship of mastoparan M is crucial for its development.
Purpose of the Study:
- To chemically synthesize all-D and all-L mastoparan M.
- To investigate the secondary structure of mastoparan M in different solutions.
- To evaluate the in vitro antitumor activity of D-mastoparan M against various tumor cell lines.
Main Methods:
- Chemical synthesis of all-D and all-L mastoparan M.
- Circular dichroism spectroscopy to determine alpha-helical content.
- MTT assay to assess tumor cell viability and growth inhibition.
- Scanning-beam electron microscopy for morphological analysis of treated cells.
Main Results:
- Both D- and L-mastoparan M exhibited significant alpha-helical structures in 30% trifluoroethanol but reduced helical content in phosphate buffer.
- D-mastoparan M demonstrated potent inhibition of tumor cell growth across multiple cell lines (Colo 225, KB, Hep-2, H226Br, HeLa) at 12.5 µg/mL.
- Electron microscopy revealed direct cell lysis, characterized by hollow, shrunk, and collapsed structures, in tumor cells treated with D-mastoparan M.
Conclusions:
- D-mastoparan M possesses superior in vitro antitumor activity compared to its L-enantiomer.
- The mechanism of action involves direct lysis of tumor cells.
- Mastoparan M represents a promising candidate for further investigation as an anticancer agent.
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