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Integrins and extracellular matrix proteins modulate adipocyte thermogenic capacity
Maria A Gonzalez Porras1, Katerina Stojkova1, Marcella K Vaicik2
1Department of Biomedical Engineering and Chemical Engineering, AET 1.102, The University of Texas at San Antonio, 1 UTSA Circle, San Antonio, TX, 78249, USA.
Scientific Reports
|March 9, 2021
Summary
Laminin α4 (LAMA4) gene mutation enhances thermogenic fat markers in mice. This study reveals extracellular matrix proteins, like integrin α7 (ITA7), regulate beige adipose formation and energy metabolism.
Area of Science:
- Metabolic disease research
- Adipose tissue biology
- Extracellular matrix composition
Background:
- Obesity and metabolic diseases increase mortality.
- Activating brown or beige fat enhances thermogenesis, a potential metabolic disease treatment.
- Local factors controlling adipocyte fate are not fully understood.
Purpose of the Study:
- Evaluate changes in white adipose tissue (WAT) extracellular matrix in laminin α4 (LAMA4) gene knockout (KO) mice.
- Investigate the role of extracellular matrix interactions in adipocyte thermogenic capacity and beige fat formation.
Main Methods:
- Liquid chromatography/tandem mass spectrometry to analyze WAT extracellular matrix.
- Immunohistochemical staining to assess protein levels and distribution.
- In vitro differentiation of adipose-derived stem cells with gene knockdown.
Main Results:
- KO mice showed reduced collagen 1A1, 3A1, integrin α7 (ITA7), and β1 (ITB1) in WAT.
- Lower ITA7 and collagen levels were observed in brown adipose tissue compared to WAT in wild-type mice.
- ITA7 knockdown during stem cell differentiation increased beige fat formation.
Conclusions:
- Extracellular matrix interactions, particularly involving ITA7, regulate adipocyte thermogenic capacity.
- ITA7 plays a significant role in beige adipose formation.
- Understanding these mechanisms can improve energy metabolism and glucose homeostasis.
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