| First Author | Guo H | Year | 2012 |
| Journal | J Biol Chem | Volume | 287 |
| Issue | 30 | Pages | 24941-54 |
| PubMed ID | 22665489 | Mgi Jnum | J:316033 |
| Mgi Id | MGI:6832563 | Doi | 10.1074/jbc.M112.369355 |
| Citation | Guo H, et al. (2012) Transcriptional regulation of the protocadherin beta cluster during Her-2 protein-induced mammary tumorigenesis results from altered N-glycan branching. J Biol Chem 287(30):24941-54 |
| abstractText | Changes in the levels of N-acetylglucosaminyltransferase V (GnT-V) can alter the function of several types of cell surface receptors and adhesion molecules by causing altered N-linked glycan branching. Using a her-2 mammary tumor mouse model, her-2 receptor signaling was down-regulated by GnT-V knock-out, resulting in a significant delay in the onset of her-2-induced mammary tumors. To identify the genes that contributed to this GnT-V regulation of early events in tumorigenesis, microarray analysis was performed using her-2 induced mammary tumors from wild-type and GnT-V-null mice. We found that 142 genes were aberrantly expressed (>2.0-fold) with 64 genes up-regulated and 78 genes down-regulated after deletion of GnT-V. Among differentially expressed genes, the expression of a subgroup of the cadherin superfamily, the protocadherin beta (Pcdhbeta) cluster, was up-regulated in GnT-V-null tumors. Altered expression of the Pcdhbeta cluster in GnT-V-null tumors was not due to changes in promoter methylation; instead, impaired her-2-mediated signaling pathways were implicated at least in part resulting from reduced microRNA-21 expression. Overexpression of Pcdhbeta genes inhibited tumor cell growth, decreased the proportion of tumor-initiating cells, and decreased tumor formation in vivo, demonstrating that expression of the Pcdhbeta gene cluster can serve as an inhibitor of the transformed phenotype. Our results suggest the up-regulation of the Pcdhbeta gene cluster as a mechanism for reduced her-2-mediated tumorigenesis resulting from GnT-V deletion. |
