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Authors Pinchot SN, Adler JT, Luo Y, Ju J, Li W, Shen B, Kunnimalaiyaan M, Chen H
Author Profile(s)
Journal Am. J. Surg. Volume: 197 Issue: 3 Pages: 313-9
Publish Date 2009 Mar
PubMed ID 19245907
PMC ID 2664746

Carcinoids are neuroendocrine (NE) tumors with limited treatment options. Raf-1 pathway activation has been shown to suppress hormone production in carcinoid cells. We investigated a novel treatment for carcinoid cell growth based on pharmacologic Raf-1 activation using the compound tautomycin (TTY).Human carcinoid cells were treated with TTY for 48 hours. Western blot analysis was used to demonstrate Raf-1 pathway activation by phosphorylation of ERK1/2 and to determine the effect on NE tumor markers. Cellular growth was measured by methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay.Treatment with TTY resulted in dose-dependent activation of the Raf-1 pathway. Furthermore, a significant decrease in NE tumor markers was seen. Importantly, TTY inhibited carcinoid cellular growth and induced the cell-cycle inhibitors p21 and p27.TTY activates the Raf-1 pathway, limits carcinoid cell growth, and suppresses NE marker production in vitro. This new compound warrants further investigation in animal models of carcinoid cancer.

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