期刊
AIDS
卷 17, 期 17, 页码 2437-2444出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00002030-200311210-00005
关键词
protease inhibitor; 3T3-F442A adipocyte; thiazolidinedione; SREBP-1; lamin A/C; nuclear morphology
Objectives: To study whether HIV protease inhibitors could induce nuclear lamina alterations in adipocytes as observed in a genetic form of lipodystrophy due to lamin A/C mutation. Design: We have previously observed that indinavir (IDV) impairs adipocyte differentiation and sterol regulatory element-binding protein-1 (SREBP-1) nuclear localization in 3T3-F442A adipocytes. We compared here the effects of IDV with that produced by two other PIs, nelfinavir (NFV) and amprenavir (APV) on adipose conversion, cellular localization of SREBP-1, nuclear morphology, and maturation and stability of the lamina network. Results: IDV and NFV, but not APV, altered adipose cell differentiation, as shown by lipid staining and protein expression of SREBP-1, CAAAT/enhancer binding protein (C/ EBP)alpha and fatty acid synthase (FAS). In IDV-treated cells, 50-60% of the nuclei could not accumulate SREBP-1. Twenty percent of these SREBP-negative nuclei were grossly dysmorphic, with blebs and prominent herniations, and showed an altered distribution of lamin A/C and lamin B. In IDV-treated cells, nuclear fragilization was shown by the abnormal extractibility of lamina proteins and SREBP-1, and the accumulation of prelamin A. NFV similarly altered lamin A/C maturation whereas APV was almost ineffective. Conclusions: We show in an adipose cell line that IDV and NFV induced alterations at the nuclear level by promoting defects in lamin A/C maturation, organization and stability. We suggest that these lamina network alterations might be responsible for SREBP-1 nuclear mislocalization therefore resulting in altered adipocyte differentiation. (C) 2003 Lippincott Williams Wilkins.
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