| First Author | Khan D | Year | 2017 |
| Journal | Biochim Biophys Acta | Volume | 1861 |
| Issue | 4 | Pages | 749-758 |
| PubMed ID | 28069397 | Mgi Jnum | J:254052 |
| Mgi Id | MGI:6104271 | Doi | 10.1016/j.bbagen.2017.01.005 |
| Citation | Khan D, et al. (2017) Influence of neuropeptide Y and pancreatic polypeptide on islet function and beta-cell survival. Biochim Biophys Acta 1861(4):749-758 |
| abstractText | BACKGROUND: In the present study we assessed the impact of neuropeptide Y receptor (NPYR) modulators, neuropeptide Y (NPY) and pancreatic polypeptide (PP), on islet function and beta-cell survival. METHODS: The effects of NPY and PP on beta-cell function were examined in BRIN BD11 and 1.1B4 beta-cells, as well as isolated mouse islets. Involvement of both peptides in pancreatic islet adaptations to streptozotocin and hydrocortisone, as well as effects on beta-cell proliferation and apoptosis was also evaluated. RESULTS: Neither NPY nor PP affected in vivo glucose disposal or insulin secretion in mice. However, both peptides inhibited (p<0.05 to p<0.001) glucose stimulated insulin secretion from rat and human beta-cells. NPY exerted similar insulinostatic effects in isolated mouse islets. NPY and PP inhibited alanine-induced changes in BRIN BD11 cell membrane potential and (Ca(2+))i. Streptozotocin treatment decreased and hydrocortisone treatment increased beta-cell mass in mice. In addition, streptozotocin, but not hydrocortisone, increased PP cell area. Streptozotocin also shifted the normal co-localisation of NPY with PP, towards more pronounced co-expression with somatostatin in delta-cells. Both streptozotocin and hydrocortisone increased pancreatic exocrine expression of NPY. More detailed in vitro investigations revealed that NPY, but not PP, augmented (p<0.01) BRIN BD11 beta-cell proliferation. In addition, both peptides exerted protective effects against streptozotocin-induced DNA damage in beta-cells. CONCLUSION: These data emphasise the involvement of PP, and particularly NPY, in the regulation of beta-cell mass and function. GENERAL SIGNIFICANCE: Modulation of PP and NPY signalling is suitable for further evaluation and possible clinical development for the treatment of diabetes. |
