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Molecular and Cellular Bases of Lipodystrophy Syndromes
Jamila Zammouri1, Camille Vatier1,2, Emilie Capel1
1Sorbonne University, Inserm UMR_S 938, Saint-Antoine Research Centre, Cardiometabolism and Nutrition University Hospital Institute (ICAN), Paris, France.
Abstract:
Lipodystrophy syndromes are rare diseases originating from a generalized or partial loss of adipose tissue. Adipose tissue dysfunction results from heterogeneous genetic or acquired causes, but leads to similar metabolic complications with insulin resistance, diabetes, hypertriglyceridemia, nonalcoholic fatty liver disease, dysfunctions of the gonadotropic axis and endocrine defects of adipose tissue with leptin and adiponectin deficiency. Diagnosis, based on clinical and metabolic investigations, and on genetic analyses, is of major importance to adapt medical care and genetic counseling. Molecular and cellular bases of these syndromes involve, among others, altered adipocyte differentiation, structure and/or regulation of the adipocyte lipid droplet, and/or premature cellular senescence. Lipodystrophy syndromes frequently present as systemic diseases with multi-tissue involvement. After an update on the main molecular bases and clinical forms of lipodystrophy, we will focus on topics that have recently emerged in the field. We will discuss the links between lipodystrophy and premature ageing and/or immuno-inflammatory aggressions of adipose tissue, as well as the relationships between lipomatosis and lipodystrophy. Finally, the indications of substitutive therapy with metreleptin, an analog of leptin, which is approved in Europe and USA, will be discussed.
Insights
Lipodystrophy syndromes involve rare adipose tissue loss, causing metabolic issues like diabetes and insulin resistance. Early diagnosis and understanding molecular causes are key for managing these systemic diseases.
Area of Science:
- Endocrinology
- Genetics
- Metabolic Diseases
Background:
- Lipodystrophy syndromes are rare genetic or acquired disorders characterized by adipose tissue loss.
- These conditions lead to severe metabolic complications, including insulin resistance, diabetes, and hypertriglyceridemia.
- Dysfunctions in adipose tissue hormones like leptin and adiponectin are central to the pathology.
Purpose of the Study:
- To provide an update on the molecular bases and clinical presentations of lipodystrophy syndromes.
- To explore emerging topics such as links to premature aging, inflammation, and lipomatosis.
- To discuss the therapeutic indications for metreleptin, a leptin analog.
Main Methods:
- Review of current literature on molecular and cellular mechanisms of lipodystrophy.
- Analysis of clinical investigations and genetic testing in diagnosis.
- Discussion of recent research on associated conditions and therapeutic strategies.
Main Results:
- Adipose tissue dysfunction stems from diverse genetic/acquired causes, resulting in consistent metabolic disturbances.
- Molecular bases involve altered adipocyte differentiation, lipid droplet regulation, and cellular senescence.
- Emerging research highlights connections to premature aging, immune/inflammatory processes, and lipomatosis.
Conclusions:
- Accurate diagnosis through clinical, metabolic, and genetic evaluation is crucial for patient care and counseling.
- Understanding the systemic nature and molecular underpinnings of lipodystrophy is vital.
- Metreleptin offers a potential therapeutic option for specific lipodystrophy cases.
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