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Pelosi M, Testet E, Le Lay S, Dugail I, Tang X, Mabilleau G, Hamel Y, Madrange M, Blanc T, Odent T, McMullen TPW, Alfò M, Brindley DN, de Lonlay P. Normal human adipose tissue functions and differentiation in patients with biallelic LPIN1 inactivating mutations. J Lipid Res 2017; 58:2348-2364. [PMID: 28986436 PMCID: PMC5711497 DOI: 10.1194/jlr.p075440] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 08/23/2017] [Indexed: 12/22/2022] Open
Abstract
Lipin-1 is a Mg2+-dependent phosphatidic acid phosphatase (PAP) that in mice is necessary for normal glycerolipid biosynthesis, controlling adipocyte metabolism, and adipogenic differentiation. Mice carrying inactivating mutations in the Lpin1 gene display the characteristic features of human familial lipodystrophy. Very little is known about the roles of lipin-1 in human adipocyte physiology. Apparently, fat distribution and weight is normal in humans carrying LPIN1 inactivating mutations, but a detailed analysis of adipose tissue appearance and functions in these patients has not been available so far. In this study, we performed a systematic histopathological, biochemical, and gene expression analysis of adipose tissue biopsies from human patients harboring LPIN1 biallelic inactivating mutations and affected by recurrent episodes of severe rhabdomyolysis. We also explored the adipogenic differentiation potential of human mesenchymal cell populations derived from lipin-1 defective patients. White adipose tissue from human LPIN1 mutant patients displayed a dramatic decrease in lipin-1 protein levels and PAP activity, with a concomitant moderate reduction of adipocyte size. Nevertheless, the adipose tissue develops without obvious histological signs of lipodystrophy and with normal qualitative composition of storage lipids. The increased expression of key adipogenic determinants such as SREBP1, PPARG, and PGC1A shows that specific compensatory phenomena can be activated in vivo in human adipocytes with deficiency of functional lipin-1.
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Affiliation(s)
- Michele Pelosi
- Centre de Référence des Maladies Héréditaires du Métabolisme, Institut Imagine des Maladies Génétiques, Laboratoire de génétique des maladies autoinflammatoires monogéniques, INSERM UMR1163, Université Paris Descartes et Hôpital Necker-Enfants malades (Assistance publique - Hôpitaux de Paris), Paris, France
| | - Eric Testet
- Laboratoire de Biogenèse Membranaire-UMR 5200, CNRS, Université de Bordeaux, Villenave d'Ornon, France
| | - Soazig Le Lay
- INSERM, UMR1063, Université d'Angers, UBL, Angers, France
| | - Isabelle Dugail
- INSERM, U1166, Equipe 6, Université Pierre et Marie Curie, Paris, France
| | - Xiaoyun Tang
- Department of Biochemistry, Signal Transduction Research Group, University of Alberta, Edmonton, Alberta, Canada
| | | | - Yamina Hamel
- Centre de Référence des Maladies Héréditaires du Métabolisme, Institut Imagine des Maladies Génétiques, Laboratoire de génétique des maladies autoinflammatoires monogéniques, INSERM UMR1163, Université Paris Descartes et Hôpital Necker-Enfants malades (Assistance publique - Hôpitaux de Paris), Paris, France
| | - Marine Madrange
- Centre de Référence des Maladies Héréditaires du Métabolisme, Institut Imagine des Maladies Génétiques, Laboratoire de génétique des maladies autoinflammatoires monogéniques, INSERM UMR1163, Université Paris Descartes et Hôpital Necker-Enfants malades (Assistance publique - Hôpitaux de Paris), Paris, France
| | - Thomas Blanc
- Department of Pediatric Surgery and Urology, Hôpital Necker-Enfants malades-Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Thierry Odent
- Department of Pediatric Orthopedics, Hôpital Necker-Enfants malades-Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Todd P W McMullen
- Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
| | - Marco Alfò
- Dipartimento di Scienze Statistiche, Sapienza Università di Roma, Rome, Italy
| | - David N Brindley
- Department of Biochemistry, Signal Transduction Research Group, University of Alberta, Edmonton, Alberta, Canada
| | - Pascale de Lonlay
- Centre de Référence des Maladies Héréditaires du Métabolisme, Institut Imagine des Maladies Génétiques, Laboratoire de génétique des maladies autoinflammatoires monogéniques, INSERM UMR1163, Université Paris Descartes et Hôpital Necker-Enfants malades (Assistance publique - Hôpitaux de Paris), Paris, France
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