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Somatic cell plasticity and Niemann-pick type C2 protein: adipocyte differentiation and function
Chad Csepeggi1, Min Jiang, Andrey Frolov
1Department of Internal Medicine, Division of Cardiovascular Diseases, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA.
The Journal of Biological Chemistry
|July 24, 2010
Summary
Loss of NPC2 gene function in fibroblasts promotes differentiation into white adipocytes. NPC2 is crucial for maintaining white adipocyte function and metabolic state, offering a therapeutic target for metabolic disorders.
Area of Science:
- Cell Biology
- Metabolic Disorders
- Molecular Biology
Background:
- Somatic cell phenotypic stability is vital for organ integrity.
- Deregulated cell plasticity can lead to diseases like cancer and type 2 diabetes.
- A mutation in the NPC2 gene activates human skin fibroblasts into myofibroblasts with stem cell properties.
Purpose of the Study:
- To investigate the role of the NPC2 gene in adipocyte differentiation and function.
- To explore NPC2's mechanism in controlling adipogenesis and metabolic state.
- To identify NPC2 as a potential therapeutic target for metabolic disorders.
Main Methods:
- Comparison of NPC2-null and normal skin fibroblasts for adipogenic potential.
- Analysis of gene expression patterns related to adipogenesis.
- Silencing NPC2 in mature white adipocytes using siRNA.
- Assessment of metabolic changes, including lipolysis and insulin sensitivity.
Main Results:
- NPC2-null fibroblasts exhibit characteristics of adipogenic progenitors and differentiate into white adipocytes.
- NPC2 is necessary for maintaining mature white adipocyte function.
- NPC2 silencing in adipocytes up-regulates PPARG, promoting a brown adipocyte-like metabolic state with increased insulin sensitivity.
- NPC2 controls adipogenesis and adipocyte metabolism via FGFR2 activation and PPARG induction.
Conclusions:
- NPC2 acts as an intracrine/autocrine factor regulating adipocyte differentiation and function.
- NPC2 plays a critical role in maintaining the metabolic state of white adipocytes.
- Targeting NPC2 presents a potential therapeutic strategy for type 2 diabetes and related metabolic disorders.
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