title: Effects of oligo(3-hydroxyalkanoates) on the viability and insulin secretion of murine beta cells.
abstract: Biopolyesters of polyhydroxyalkanoates (PHAs), including poly-3-hydroxybutyrate (PHB), co-polyester of 3-hydroxybutyrate and 4-hydroxybutyrate (P3HB4HB), and co-polyester of 3-hydroxybutyrate and 3-hydroxyhexanoate (PHBHHx) have been well investigated for their biocompatibility. For in vivo application, it is very important that the degradation products of PHAs, especially the oligomers, are not harmful to the cells and surrounding tissues. In this study, in vitro effects of oligo(3-hydroxybutyrate) (OHB), oligo(3-hydroxybutyrate-co-4-hydroxybutyrate) (O3HB4HB) and oligo(3-hydroxybutyrate-co-3-hydroxyhexanoate) (OHBHHx) on growth and differentiation of the murine beta cell line NIT-1 were investigated. Among the three oligo-hydroxyalkanoates (Oligo-HAs), cells treated with OHBHHx displayed higher viability, as measured by CCK-8 assay. Flow cytometric analysis of NIT-1 cells indicated that Oligo-HAs had an inhibitory effect on cell apoptosis. The cytosolic Ca(2+) transient of NIT-1 cells increased when fed with 0.04 g/l Oligo-HAs. For gap junction intercellular communication of cells, the effect of OHBHHx was the best among all materials tested. More importantly, extracellular insulin secretion was up-regulated after growing in OHBHHx for 48 h. The results demonstrated that the degradation products of PHAs, especially OHBHHx from PHBHHx, were not harmful to the beta cells. Therefore, PHBHHx warrant further study for application as a pancreatic tissue engineering material.
authors.affiliation: Shantou University, Shantou 515063, Guangdong, People's Republic of China.
authors.forename: Xiao-Di
authors.initials: XD
authors.lastname: Yang
authors.forename: Xiang-Hui
authors.initials: XH
authors.lastname: Zou
authors.forename: Zhong-Wei
authors.initials: ZW
authors.lastname: Dai
authors.forename: Rong-Cong
authors.initials: RC
authors.lastname: Luo
authors.forename: Chi-Ju
authors.initials: CJ
authors.lastname: Wei
authors.forename: Guo-Qiang
authors.initials: GQ
authors.lastname: Chen
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D002087:Butyrates / Q000737:chemistry*; D002118:Calcium / Q000378:metabolism; D002450:Cell Communication / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D017629:Gap Junctions / Q000187:drug effects / Q000378:metabolism; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D050417:Insulin-Secreting Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D008422:Materials Testing; D051379:Mice; D011108:Polymers / Q000737:chemistry* / Q000494:pharmacology*; D023822:Tissue Engineering; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D002087:Butyrates; D007328:Insulin; D011108:Polymers; D002118:Calcium