Teleocidin derivatives and the core structure, (-)-
indolactam-V ((-)-IL-V), adopt two conformations in
solution, the "twist" and the "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 12 nM, respectively. As for the induction of
tumor necrosis factor-alpha (
TNF-alpha) 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-alpha in the medium, were 1700, 500 and 19 nM for (-)-IL-V, (-)-BL-V8-310 and
teleocidin 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% and 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.