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Isolation and Properties of Cytotoxic Antibiotics Produced by Myxococcus stipitatus JW150  

안종웅 (한국화학연구원 생명의약부)
이정옥 (한국화학연구원 생명의약부)
Publication Information
YAKHAK HOEJI / v.46, no.2, 2002 , pp. 108-112 More about this Journal
Abstract
Drug resistance is one of the most significant impediments to successful chemotherapy of cancer. Multidrug-resistance (MDR) is characterized by decreased cellular sensitivity to anticancer agents due to the overexpression of P-glycoprotein. By employing a resistant subline of HCT15 to adriamycin (CL02), we undertook the screening for agents which were effective to multidrug-resistant cancer cells. As a result, a myxobacterial strain JW150 was selected for study since an activity against CL02 cells was discovered in the strain. Cytotoxicity-guided fractionation of the culture broth led to the isolation of cystothiazole A and melithiazole F. The producing organism was identified as Myxococcus stipitatus by taxonomic comparison with type strains of Myxococcus sp. as well as its morphological and physiological characteristics. Cystothiazole A and melithiazole F demonstrated potent cytotoxicity against certain human cancer cells with $IC_{50}$ values ranging from 0.03~ $0.72{\mu}{\textrm{g}}$/ml. Both compounds were interestingly as active against drug-resistant sublines CL02 and CP70 as against the corresponding parental cells.
Keywords
Myxococcus stipitatus; cystothiazole A; melithiazole F; mdr-cancer cell; cytotoxicity;
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