1. Autoantibodies to Perilipin-1 Define a Subset of Acquired Generalized Lipodystrophy.
- Author
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Mandel-Brehm, Caleigh, Vazquez, Sara E, Liverman, Christopher, Cheng, Mickie, Quandt, Zoe, Kung, Andrew F, Parent, Audrey, Miao, Brenda, Disse, Emmanuel, Cugnet-Anceau, Christine, Dalle, Stéphane, Orlova, Elizaveta, Frolova, Elena, Alba, Diana, Michels, Aaron, Oftedal, Bergithe E, Lionakis, Michail S, Husebye, Eystein S, Agarwal, Anil K, Li, Xilong, Zhu, Chengsong, Li, Quan, Oral, Elif, Brown, Rebecca, Anderson, Mark S, Garg, Abhimanyu, and DeRisi, Joseph L
- Subjects
Biomedical and Clinical Sciences ,Immunology ,Women's Health ,Clinical Research ,Autoimmune Disease ,Immunotherapy ,Rare Diseases ,2.1 Biological and endogenous factors ,Inflammatory and immune system ,Humans ,Animals ,Mice ,Perilipin-1 ,Autoantibodies ,Lipodystrophy ,Congenital Generalized ,Lipodystrophy ,Adipose Tissue ,Medical and Health Sciences ,Endocrinology & Metabolism ,Biomedical and clinical sciences - Abstract
Acquired lipodystrophy is often characterized as an idiopathic subtype of lipodystrophy. Despite suspicion of an immune-mediated pathology, biomarkers such as autoantibodies are generally lacking. Here, we used an unbiased proteome-wide screening approach to identify autoantibodies to the adipocyte-specific lipid droplet protein perilipin 1 (PLIN1) in a murine model of autoimmune polyendocrine syndrome type 1 (APS1). We then tested for PLIN1 autoantibodies in human subjects with acquired lipodystrophy with two independent severe breaks in immune tolerance (including APS1) along with control subjects using a specific radioligand binding assay and indirect immunofluorescence on fat tissue. We identified autoantibodies to PLIN1 in these two cases, including the first reported case of APS1 with acquired lipodystrophy and a second patient who acquired lipodystrophy as an immune-related adverse event following cancer immunotherapy. Lastly, we also found PLIN1 autoantibodies to be specifically enriched in a subset of patients with acquired generalized lipodystrophy (17 of 46 [37%]), particularly those with panniculitis and other features of autoimmunity. These data lend additional support to new literature that suggests that PLIN1 autoantibodies represent a marker of acquired autoimmune lipodystrophies and further link them to a break in immune tolerance.
- Published
- 2023