Regulatory Expression of Genes Related to Metastasis by TGF-beta and Activin A in B16 Murine Melanoma Cells

Overview

Journal Mol Biol Rep

Specialty Molecular Biology

Date 2009 Mar 17

PMID 19288218

Citations 16

Authors

Masaru Murakami

Makiko Suzuki

Yoshii Nishino

Masayuki Funaba

Affiliations

Soon will be listed here.

Abstract

TGF-beta induces epithelial-mesenchymal transition, which occurs during tumor cell invasiveness in pathological state, in limited cells. As a first step to understand the role of TGF-beta and the structurally related activin during melanoma metastasis, expression of metastasis-related genes was examined in murine melanoma cells. Treatment with TGF-beta1 or activin A down-regulated E-cadherin in B16 cells in a dose-dependent manner. In epithelial cells, TGF-beta-induced high mobility group A2 (HMGA2) gene product is suggested to down-regulate E-cadherin through up-regulation of zinc-finger transcription factors Slug and Snail, and basic helix-loop-helix transcription factor Twist. Unlike the regulation in epithelial cells, TGF-beta1 treatment rather decreased mRNA expression of HMGA2, indicating a distinct mechanism on TGF-beta/activin-induced down-regulation. Transfection of double-stranded interfering RNA (dsRNAi) for activin receptor-like kinase (ALK) type I receptors revealed that ALK5, a prototype of TGF-beta receptor, mainly transmits TGF-beta signals on the E-cadherin down-regulation at the mRNA level, and that a prototype receptor ALK4 elicited the activin effect. TGF-beta/activin potentiated down-regulation of E-cadherin and HMGA2 also in B16 sublines that are susceptible to metastasis. However, the extent of down-regulation tended to be smaller, and less Smad2, a signal mediator for TGF-beta/activin, was phosphorylated in response to the ligand, resulting from less expression of type I receptors in the B16 sublines. These results suggest that the receptor expression level determines strength of the signals for TGF-beta/activin through phosphorylation of Smad2, which explains pluripotency of the ligand family partly.

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