| First Author | Spaeth JM | Year | 2017 |
| Journal | Diabetes | Volume | 66 |
| Issue | 11 | Pages | 2830-2839 |
| PubMed ID | 28705881 | Mgi Jnum | J:245178 |
| Mgi Id | MGI:5913982 | Doi | 10.2337/db16-1516 |
| Citation | Spaeth JM, et al. (2017) Defining a Novel Role for the Pdx1 Transcription Factor in Islet beta-Cell Maturation and Proliferation During Weaning. Diabetes 66(11):2830-2839 |
| abstractText | The transcription factor encoded by the Pdx1 gene is a critical transcriptional regulator, as it has fundamental actions in the formation of all pancreatic cell types, islet beta-cell development, and adult islet beta-cell function. Transgenic- and cell line-based experiments have identified 5'-flanking conserved sequences that control pancreatic and beta-cell type-specific transcription, which are found within areas I (bp -2694 to -2561), II (bp -2139 to -1958), III (bp -1879 to -1799), and IV (bp -6200 to -5670). Because of the presence in area IV of binding sites for transcription factors associated with pancreas development and islet cell function, we analyzed how an endogenous deletion mutant affected Pdx1 expression embryonically and postnatally. The most striking result was observed in male Pdx1DeltaIV mutant mice after 3 weeks of birth (i.e., the onset of weaning), with only a small effect on pancreas organogenesis and no deficiencies in their female counterparts. Compromised Pdx1 mRNA and protein levels in weaned male mutant beta-cells were tightly linked with hyperglycemia, decreased beta-cell proliferation, reduced beta-cell area, and altered expression of Pdx1-bound genes that are important in beta-cell replication, endoplasmic reticulum function, and mitochondrial activity. We discuss the impact of these novel findings to Pdx1 gene regulation and islet beta-cell maturation postnatally. |
