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条件肝细胞切除PDIA1揭示了在APOB和MTTP折叠中不可或缺的作用,以支持VLDL分泌

Zhouji Chen¹, Shiyu Wang¹, Anita Pottekat¹

¹Degenerative Diseases Program, Center for Genetics and Aging Research, Sanford Burnham Prebys Medical Discovery Institute, 10901 N. Torrey Pines Rd, La Jolla CA 92037, USA.

Molecular metabolism

|January 11, 2024

概括

蛋白二硫化异构酶A1 (PDIA1) 对于肝脏非常低密度脂蛋白 (VLDL) 的组合和分泌至关重要. PDIA1支持阿波利波蛋白B (APOB) 折叠和微体三糖转移蛋白 (MTTP) 合成,这对脂质稳定至关重要.

科学领域:

肝病学肝病学是一种肝病学.
脂质代谢脂质代谢是什么
分子陪伴者分子陪伴者

背景情况:

肝脏非常低密度脂蛋白 (VLDL) 的组合和分泌对于脂质稳定至关重要.
蛋白质二硫化异构酶A1 (PDIA1) 作为内 плазма网膜中的分子伴侣,对蛋白质折叠至关重要.

研究的目的:

调查PDIA1在维护VLDL聚集和分泌中的体内需求.
阐明PDIA1影响VLDL生产的机制.

主要方法:

在成年小鼠肝细胞中条件删除Pdia1/P4hb.
在初级肝细胞中进行机械分析,以评估MTTP和Apolipoprotein B (APOB) 的合成,降解和分泌.
评估PDIA1与APOB的相互作用及其陪伴功能.

主要成果:

肝细胞特异性Pdia1删除抑制了MTTP表达,降低了VLDL的产生,并导致肝脏肥胖症和低脂血症.
PDIA1 除阻止了Mttp mRNA 翻译,但没有影响MTTP mRNA或蛋白质的稳定性.
PDIA1与MTTP独立地与APOB相互作用,促进APOB的折叠和分泌.

结论:

对于APOB折叠,MTTP合成和活动来说,PDIA1是不可或缺的,从而支持VLDL组装.
PDIA1是肝脏VLDL生产的必需组成部分,与APOB和MTTP一起.

关键词:

脂肪肝疾病是一种脂肪肝疾病.脂蛋白代谢的代谢方式微小的三糖转移蛋白质是微小的三糖.蛋白质二硫化物异构酶A1是蛋白质二硫化物异构酶A1的一种.蛋白质折叠过程中的蛋白质折叠不折叠的蛋白质反应反应这是一种VLDL分泌物.

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