pVHL-mediated transcriptional repression of c-Myc by recruitment of histone deacetylases

The biological functions of Myc are to regulate cell growth, apoptosis, cell differentiation and stem-cell self-renewal. Abnormal accumulation of c-Myc is able to induce excessive proliferation of normal cells. von Hippel-Lindau protein (pVHL) is a key regulator of hypoxia-inducible factor1α HIF1α), thus accumulation and hyperactivation of HIF1α is the most prominent feature of VHL-mutated renal cell carcinoma. Interestingly, the Myc pathway is reported to be activated in renal cell carcinoma even though the precise molecular mechanism still remains to be established. Here, we demonstrated that pVHL locates at the c-Myc promoter region through physical interaction with Myc. Furthermore, pVHL reinforces HDAC1/2 recruitment to the Myc promoter, which leads to the auto-suppression of Myc. Therefore, one possible mechanism of Myc auto-suppression by pVHL entails removing histone acetylation. Our study identifies a novel mechanism for pVHL-mediated negative regulation of c-Myc transcription.