Title of article :
Association between altered expression of adipogenic factor SREBP1 in lipoatrophic adipose tissue from HIV-1-infected patients and abnormal adipocyte differentiation and insulin resistance
Author/Authors :
Jean-Philippe Bastard، نويسنده , , Martine Caron، نويسنده , , Hubert Vidal، نويسنده , , Véronique Jan، نويسنده , , Martine Auclair، نويسنده , , Corinne Vigouroux، نويسنده , , Jacqueline Luboinski، نويسنده , , Martine Laville، نويسنده , , Mustapha Maachi، نويسنده , , Pierre-Marie Girard، نويسنده , , Willy Rozenbaum، نويسنده , , Philippe Levan، نويسنده , , Jacqueline Capeau، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2002
Pages :
6
From page :
1026
To page :
1031
Abstract :
Background Lipodystrophy is a major side-effect of antiretroviral therapy but its pathophysiology remains elusive. In-vitro studies show that HIV-1-protease inhibitors affect adipocyte differentiation at an early step involving sterol-regulatory-element-binding-protein-1 (SREBP1), but in-vivo studies are lacking. Methods We compared fat morphology and mRNA and protein expression of major adipocyte differentiation markers and cytokines in subcutaneous abdominal adipose tissue from 26 HIV-1-infected patients who developed peripheral lipoatrophy while on protease inhibitors and from 18 HIV-1-seronegative healthy controls. Findings Patientsʹ fat contained a higher proportion of small adipocytes than control fat, together with lower mRNA concentrations of the adipogenic differentiation factors CCAAT-enhancer binding protein (C/EBP) β and α, peroxisome proliferator-activated receptor (PPAR) γ, and the 1c isoform of SREBP1, with a median decrease of 93% in the latter. The SREBP1 protein concentration was increased 2•6-fold, whereas the PPARγ protein concentration was decreased by 70%. The expression of adipocyte-specific markers, including leptin, was lower in fat from patients than in fat from controls, whereas expression of tumour necrosis factor (TNF) α was higher and correlated negatively with the expression of SREBP1c and downstream adipogenic factors. SREBP1c mRNA concentrations correlated negatively, and TNFα mRNA concentrations positively, with glycaemia and insulin resistance, but did not correlate with lipid variables. Interpretation The altered differentiation status of peripheral adipocytes in HIV-1-infected patients with antiretroviral-induced lipoatrophy is associated with greatly reduced SREBP1c expression. Since the differentiation factor SREBP1 is rapidly targeted by protease inhibitors in vitro, our results suggest that SREBP1c could be an important mediator of peripheral lipoatrophy in this setting, leading to metabolic alterations such as insulin resistance.
Journal title :
The Lancet
Serial Year :
2002
Journal title :
The Lancet
Record number :
555987
Link To Document :
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