Twist Form of Teleocidin Derivatives is Active in in Vivo Tumor Promotion by (-)-Benzolactam-V8-310

Abstract

Teleocidin derivatives and the core structure, (-)-indolactam-V ((-)-IL-V), adopt two conformations in solution, the "twist" and he "sofa" forms. (-)-Benzolactam-V8-310 ((-)-BL-V8-310), which specifically adopts the twist form in solution, has been reported to have a significant effect on HL-60 cells and protein kinase C affinity. In this paper, we describe the biological activity with regard to tumor promotion on mouse skin and the wide variety of biological activity of (-)-BL-V8-310 and its derivatives. In both twist and sofa forms (-)-BL-V8-310 inhibited specific ³H-12-O-tetradecanoylphorbol-13-acetate (TPA) binding to a particulate fraction of mouse skin more strongly than (-)-IL-V. The doses for 50% inhibition (IC₅₀) of (-)-IL-V, (-)-BL-V8-310, and teleocidin B-4 were 1000, 400 and 12nM, respectively. As for the induction of tumor necrosis factor-α(TNF-α) release into the medium from HL-60 cells, the EC₂₀₀ values, which are the concentrations of the compound required to achieve 200 pg/ml TNF-α in the medium, were 1700, 500 and 19 nM for (-)-IL-V, (-)-BL-V8-310 and telecidin B-4, respectively. The same amounts (5.5 nmol per application) of (-)-BL-V8-310 and teleocidin B-4, induced tumors on mouse skin initiated with 7, 12-dimethylbenz(a)anthracene (DMBA) in 13.3% abd 86.7% of tumor-bearing mice, respectively, in week 20. These results confirmed that the twist form of teleocidin derivatives is the active form as far as the induction of biological activity is concerned. Also (-)-BL-V8-310 is a new synthetic tumor promoter designed from data obtained using the receptor cavity model of TPA-type tumor promoters.