p388/adr

Zosuquidar trihydrochloride (LY-335979 trihydrochloride) is a highly selective, potent competitive inhibitor of P-glycoprotein (P-gp, ABCB1) with a Ki value of 59 nM. Zosuquidar trihydrochloride exhibits antitumor activity and can be used in research on tumors such as leukemia.

Dihydrocytochalasin B (H2CB) is a cell division inhibitor that prevents cytokinesis, alters cell morphology, disrupts actin structures in Swiss/3T3 mouse fibroblasts, and inhibits DNA synthesis induced by serum growth factors in quiescent cultures. Low doses of H2CB lead to cell rounding and the loss of actin microfilament bundles.

Hydroquinone is a phenolic compound belonging to the hydroquinone class of reducing agents. It is used in organic synthesis, the preparation of antioxidants, as a polymerization inhibitor, and in analytical chemistry. By interfering with tyrosinase-related processes, hydroquinone reduces melanin formation and is used in research on skin pigmentation abnormalities such as hyperpigmentation and melasma. Hydroquinone exhibits strong redox activity and antioxidant properties.

A 30312 is a fused indole, which overcomes multidrug resistance in P388/Adr cells in vitro. It potentiates the cytotoxicity of the antitumor drugs Adriamycin, vincristine and vinblastine in multidrug-resistant cells with no effect on drug-sensitive parent P388 cells.

FD-211 is a δ lactone originally isolated from M. lutea with anticancer activity.1 It is cytotoxic to adriamycin-susceptible P388, T-24, HeLa, A549, and HL-60 cancer cells (IC50s = 4, 0.5, 1, 1, and 0.2 μg/ml, respectively), as well as adriamycin-resistant HL-60/ADR cells (IC50 = 0.1 μg/ml). FD-211 also inhibits DNA, RNA, and protein synthesis in HeLa cells (IC50 = 1.25 μg/ml for all). |1. Nozawa, O., Okazaki, T., Sakai, N., et al. A novel bioactive δ lactone FD-211. Taxonomy, isolation and characterization. J. Antibiot. (Tokyo) 48(2), 113-118 (1995).