| First Author | Li J | Year | 2019 |
| Journal | Int J Biol Sci | Volume | 15 |
| Issue | 7 | Pages | 1533-1545 |
| PubMed ID | 31337982 | Mgi Jnum | J:290630 |
| Mgi Id | MGI:6442814 | Doi | 10.7150/ijbs.32020 |
| Citation | Li J, et al. (2019) Amorphous solid dispersion of Berberine mitigates apoptosis via iPLA2beta/Cardiolipin/Opa1 pathway in db/db mice and in Palmitate-treated MIN6 beta-cells. Int J Biol Sci 15(7):1533-1545 |
| abstractText | Aims: Berberine (BBR) improves beta-cell function in Type 2 diabetes (T2D) because of its anti-apoptotic activity, and our laboratory developed a new preparation named Huang-Gui Solid Dispersion (HGSD) to improve the oral bioavailability of BBR. However, the mechanism by which BBR inhibits beta-cell apoptosis is unclear. We hypothesized that the Group VIA Ca(2+)-Independent Phospholipase A2 (iPLA2beta)/Cardiolipin(CL)/Opa1 signaling pathway could exert a protective role in T2D by regulating beta-cell apoptosis and that HGSD could inhibit beta-cell apoptosis through iPLA2beta/CL/Opa1 upregulation. Methods: We examined how iPLA2beta and BBR regulated apoptosis and insulin secretion through CL/Opa1 in vivo and in vitro. In in vitro studies, we developed Palmitate(PA)-induced apoptotic cell death model in mouse insulinoma cells (MIN6). iPLA2beta overexpression and silencing technology were used to examine how the iPLA2beta/CL/Opa1 interaction may play an important role in BBR treatment. In in vivo studies, db/db mice were used as a diabetic animal model. The pancreatic islet function and morphology, beta-cell apoptosis and mitochondrial injury were examined to explore the effects of HGSD. The expression of iPLA2beta/CL/Opa1 was measured to explore whether the signaling pathway was damaged in T2D and was involved in HGSD treatment. Results: The overexpression of iPLA2beta and BBR treatment significantly attenuated Palmitate- induced mitochondrial injury and apoptotic death compared with Palmitate-treated MIN6 cell. In addition, iPLA2beta silencing could simultaneously partly abolish the anti-apoptotic effect of BBR and decrease CL/Opa1 signaling in MIN6 cells. Moreover, HGSD treatment significantly decreased beta-cell apoptosis and resulted in the upregulation of iPLA2beta/CL/Opa1 compared to those of the db/db mice. Conclusion: The results indicated that the regulation of iPLA2beta/CL/Opa1 by HGSD may prevent beta-cell apoptosis and may improve islet beta-cell function in Type 2 diabetic mice and in palmitate-treated MIN6 cells. |
