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JCI:cullin 4B-RING E3连接酶复合物调节胰腺δ细胞旁分泌相互作用

2017-06-13 Yara MedSci原创

该研究结果揭示了δ细胞旁分泌相互作用的表观遗传调控机制,其中CRL4B-PRC2复合物,Cav1.2和AC6表达调节生长抑素分泌并促进胰岛中的葡萄糖体内平衡。

由胰腺δ细胞分泌的生长抑素介导胰岛中重要的旁分泌互作,包括通过控制胰岛素和胰高血糖素分泌来维持葡萄糖代谢。这种回路的破坏会导致糖尿病的发展。然而,目前关于胰岛控制生长抑素分泌的精确机制仍然难以捉摸。在这里,研究人员发现包含cullin 4B-RING E3连接酶(CRL4B)和polycomb抑制性复合物2(PRC2)的超级复合物表观上调节胰岛中的生长抑素分泌。CUL4B是CRL4B-PRC2复合物的核心部分,组织消融CUL4B后,在δ细胞中葡萄糖耐受量降低,并会通过增强生长抑素释放降低胰岛素分泌。此外,在δ细胞特异性转录因子造血表达同源异型盒(HHEX)的控制下,CRL4B-PRC2复合物通过组蛋白翻译后修饰来决定细胞内钙和cAMP的水平,从而调节Cav1的表达,随后改变了Cav1.2钙通道和腺苷酸环化酶6(AC6)和调节生长抑素分泌。cullin 4B(CUL4B)可以响应高葡萄糖水平或尿皮质素3(UCN3)刺激,而且cullin 4B(CUL4B)和PRC2亚基组蛋白赖氨酸N-甲基转移酶EZH2的表达增加以及相应的Cav1.2和AC6表达量减少共同调节生长抑素分泌。该研究结果揭示了δ细胞旁分泌相互作用的表观遗传调控机制,其中CRL4B-PRC2复合物,Cav1.2和AC6表达调节生长抑素分泌并促进胰岛中的葡萄糖体内平衡。

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    2017-09-10 gwc392
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    2017-06-15 ylz8405
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    2017-06-15 lfcmxl

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