目的:II型糖尿病(T2D)源于胰岛素抵抗,β细胞功能障碍是其进展的标志。研究表明,β细胞在T2D发育过程中发生凋亡或去分化。转录因子PAX4对β分化和存活至关重要,因此可能是T2D胰岛β细胞功能的潜在增强剂。材料和方法:将人PAX4cDNA与腺病毒载体一起递送到T2D人胰岛中,并检查了其对β细胞的影响。结果:PAX4基因递送显著提高β细胞存活率,T2D人胰岛中的β细胞组成增加。表达PAX4的胰岛中的基础胰岛素和葡萄糖刺激的胰岛素分泌明显高于未处理或对照处理的T2D人胰岛。结论:在T2D人胰岛中引入PAX4表达可改善β细胞功能,因此可以为T2D治疗提供治疗益处。
II型糖尿病(T2D)由胰岛素抵抗引起,β细胞功能障碍在其进展中起关键作用。β细胞质量和功能的缺陷主要归因于通过凋亡导致的β细胞死亡;然而,最近的研究表明,β细胞衰竭也可能是由β细胞去分化引起的-也就是说,β细胞经历成熟身份的丧失,在T2D发育过程中采用祖细胞样或产生胰高血糖素的α细胞状态。因此,防止β细胞去分化同时促进其存活的策略对于T2D治疗是有益的。在这项研究中,我们探索了PAX4,β分化和存活的关键转录因子,可以减轻T2D患者胰岛β细胞功能障碍。要做到这一点,通过基于腺病毒载体的载体将人PAX4cDNA递送到从T2D供体分离的人胰岛中,Ad5.评价Pax4及其对β细胞功能的影响。结果表明,PAX4的表达显着提高了T2D胰岛中的β细胞存活并增加了β细胞组成。值得注意的是,PAX4处理的T2D胰岛的基础胰岛素分泌和葡萄糖刺激的胰岛素分泌明显高于对照处理的胰岛。数据表明,将PAX4基因递送到T2D人胰岛中可增强β细胞质量和功能,因此可以在T2D的治疗中提供治疗益处。
Aim: Type II diabetes (T2D) stems from insulin resistance, with β-cell dysfunction as a hallmark in its progression. Studies reveal that β cells undergo apoptosis or dedifferentiation during T2D development. The transcription factor PAX4 is vital for β differentiation and survival, thus may be a potential enhancer of β-cell function in T2D islets. Materials & methods: Human PAX4 cDNA was delivered into T2D human islets with an adenoviral vector, and its effects on β cells were examined. Results: PAX4 gene delivery significantly improved β-cell survival, and increased β-cell composition in the T2D human islets. Basal insulin and glucose-stimulated insulin secretion in PAX4-expressing islets were substantially higher than untreated or control-treated T2D human islets. Conclusion: Introduced PAX4 expression in T2D human islets improves β-cell function, thus could provide therapeutic benefits for T2D treatment.
Type II diabetes (T2D) results from insulin resistance, with β-cell dysfunction playing a pivotal role in its progression. Deficits in β-cell mass and function have been attributed primarily to β-cell death through apoptosis; however, recent studies suggest β-cell failure can also arise from β-cell dedifferentiation – that is, β cells undergo a loss of mature identity, adopting either progenitor-like or glucagon-producing α cell states during T2D development. Therefore, a strategy preventing β-cell dedifferentiation while promoting its survival is beneficial for T2D treatment. In this study, we explored whether PAX4, a critical transcription factor for β differentiation and survival, could alleviate β-cell dysfunction in human islets derived from T2D patients. To accomplish that, human PAX4 cDNA was delivered into human islets isolated from T2D donors by an adenoviral vector-based vector, Ad5.Pax4 and its effects on β-cell function were evaluated. The results showed PAX4 expression significantly improved β-cell survival and increased β-cell composition in the T2D islets. Notably, PAX4-treated T2D islets exhibited significantly higher basal insulin secretion and glucose-stimulated insulin secretion than control-treated islets. The data demonstrate that PAX4 gene delivery into T2D human islets enhances β-cell mass and function, and thus may offer therapeutic benefits in the treatment of T2D.