Detection of bleomycin- like antitumor agent produced by Streptomyces spp. local isolates

J. Rweish, Asia; A. K. Ibrahim, Mohammed; A. Abdul-karim, Rafid; R. Abdul-majeed, Mohammed; K. Jawad, Zahra

	Detection of bleomycin- like antitumor agent produced by Streptomyces spp. local isolates
Jornal of Biotechnology Research Center
Article 1, Volume 1, Issue 1, 2007, Pages 15-26
Authors
Asia J. Rweish; Mohammed A. K. Ibrahim; Rafid A. Abdul-karim; Mohammed R. Abdul-majeed; Zahra K. Jawad
Abstract
Ethyl acetate extracts of fermentation cultures of five local Streptomyces isolates SRY-3, SRY-25, 5b, 10, NS-38 were identified as inhibitors of plasmacytoma cell line. Concentration at 0.016 µg/ml of ethyl acetate extract of (SRY-3,SRY-25,5b,10,NS-38) inhibited (46%,40%,21%,34%,34%) of mouse plasmacytoma cells respectively, where as 0.5 µg/ml inhibited (58%, 55%, 35%, 33%, 36%) of plasmacytoma cells . Quantities analysis of crude extracts by using HPLC on the basis of their retention times showed that the values were (4.3,4.4,4.86,4.83&4.84) min. for SRY-3, SRY-25, 5b, 10,NS-38 respectively, while the retention time of standard antitumor compounds was (4.26) min. This suggests that unknown compound of SRY-3 extract contain bleomycin-like compound. Addition of standard bleomycin to crude extract of SRY-3 increased milliabsorbans unit (M.A.U.) from 0.49 to 1.4. The concentration of bleomycin-like antitumor in fermentation broth of SRY-3 isolate was 3.441 µg/ml. The five Streptomyces isolates have moderate activity against gram-positive and gram-negative bacteria, while standard BLM have no activity.

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