Ansatrienin B

Ansatrienin B (Mycotrienin II) is an ansamycin antibiotic isolated from Streptomyces. Ansatrienin B is active against fungi and yeasts, but inactive against bacteria.Ansatrienin B displays antitumor antibiotic activity and can be used as an ADC Toxin[1][2].

Research Areas >> Cancer

Research Areas >> Infection

Signaling Pathways >> Anti-infection >> Bacterial

Ansatrienin B exhibits antimicrobial activities of Penicillium chrysogenuin 1AM 7106, Mucor pusillus IAM 6122, Rhizopus delemar IAM 6015, Saccharornyces cerevisiae IFO 0304, Candida utilus IFO 0396 and Candida krusei IFO 0590 with MIC values of 12.5 μg/ml, 12.5 μg/ml, 12.5 μg/ml, 8.0 μg/ml, 4.0 μg/ml, 4.0 μg/ml, and 4.0 μg/ml, respectively[1]. Ansatrienin B inhibits the release of 45calcium into the culture medium by fetal rat long bones with an apparent halfmaximal inhibition (IC50) value of 21 nM[2]. Ansatrienin B inhibits the translationof the protein synthesis stage by specific inhibition of L-leucine incorporation (IC50=58 nM) in A549 cells). At the same time, it also inhibits TNF-α-induced expression of ICAM-1 with an IC50 of 300 nM[3].

Ansatrienin B (intraperitoneal injection; once daily; 6 days) is against P-388 -injected mouse tumor growth. The LD50 value in mice of MTN-II is 80 mg/kg in CDF1 male mice[2].

[1]. M Sugita, et al. Studies on Mycotrienin Antibiotics, a Novel Class of Ansamycins. I. Taxonomy, Fermentation, Isolation and Properties of Mycotrienins I and II. J Antibiot (Tokyo). 1982 Nov;35(11):1460-6.

[2]. D Feuerbach, et al. Mycotrienins. A New Class of Potent Inhibitors of Osteoclastic Bone Resorption. J Biol Chem. 1995 Oct 27;270(43):25949-55.

[3]. Yuriko Yamada, et al.Mycotrienin II, a Translation Inhibitor That Prevents ICAM-1 Expression Induced by Pro-Inflammatory Cytokines. J Antibiot (Tokyo). 2011 May;64(5):361-6.