Role of cyclin D1 as a mediator of c-Met- and beta-catenin-induced hepatocarcinogenesis.

Cancer Research
Mohini A PatilXin Chen

Abstract

Activation of c-Met signaling and beta-catenin mutations are frequent genetic events observed in liver cancer development. Recently, we demonstrated that activated beta-catenin can cooperate with c-Met to induce liver cancer formation in a mouse model. Cyclin D1 (CCND1) is an important cell cycle regulator that is considered to be a downstream target of beta-catenin. To determine the importance of CCND1 as a mediator of c-Met- and beta-catenin-induced hepatocarcinogenesis, we investigated the genetic interactions between CCND1, beta-catenin, and c-Met in liver cancer development using mouse models. We coexpressed CCND1 with c-Met in mice and found CCND1 to cooperate with c-Met to promote liver cancer formation. Tumors induced by CCND1/c-Met had a longer latency period, formed at a lower frequency, and seemed to be more benign compared with those induced by beta-catenin/c-Met. In addition, when activated beta-catenin and c-Met were coinjected into CCND1-null mice, liver tumors developed despite the absence of CCND1. Intriguingly, we observed a moderate accelerated tumor growth and increased tumor malignancy in these CCND1-null mice. Molecular analysis showed an up-regulation of cyclin D2 (CCND2) expression in CCND1-null tumor sa...Continue Reading

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