alexa Isolation and characterization of a cytotoxin P4 from the venom of Naja nigricollis nigricollis preferentially active on tumor cells.
Toxicology

Toxicology

Journal of Clinical Toxicology

Author(s): ChaimMatyas A, Borkow G, Ovadia M

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Abstract Cytotoxin P4 was isolated from the venom of Naja nigricollis nigricollis in three steps and contained 55\% of the crude cytotoxic activity. It had a molecular weight of 8 KD, was stable over a pH range of 1-11 and in boiling water for at least 15 min. It had no measurable enzymatic activities, but was destroyed by proteases. Concentrations of 0.8, 1, 1.2, 25. 20 and 45 ug/ml, were needed to destroy murine melanoma B16 and WEHI 3B leukemia, rat chondrosarcoma, mouse erythrocytes and spleen cells, and human erythrocytes, respectively, thereby showing preferential cytotoxicity to the examined tumor cells. It also prevented the development of the melanoma, leukemia and chondrosarcoma tumors in vivo when mixed with the cells prior to the injection into the animal.
This article was published in Biochem Int and referenced in Journal of Clinical Toxicology

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