Mar. 2009 | Tayeba Khan, Eric S. Muise, Puneeth Iyengar, Zhao V. Wang, Manisha Chandalia, Nicola Abate, Bei B. Zhang, Paolo Bonaldo, Streamson Chua, Philipp E. Scherer
This study investigates the role of collagen VI in adipose tissue fibrosis and its impact on metabolic health. The authors found that during metabolic challenges, such as diabetes or obesity, the extracellular matrix in adipose tissue is upregulated, leading to a condition known as "adipose tissue fibrosis." Collagen VI, a key component of the extracellular matrix, is particularly enriched in adipose tissue and is upregulated in metabolically stressed conditions. In a genetic model of collagen VI deficiency (col6KOob/ob mice), the authors observed that these mice had lower body weights and improved metabolic parameters, including better glucose and lipid metabolism, reduced pancreatic hyperplasia, and decreased inflammation. The absence of collagen VI led to larger adipocyte sizes and a more flexible extracellular matrix, which enabled adipocytes to expand without the usual constraints, reducing shear stress and improving insulin signaling. Additionally, col6KOob/ob mice showed reduced inflammation and necrotic cell death, suggesting that the absence of collagen VI can mitigate the inflammatory and metabolic complications associated with obesity. These findings highlight the importance of collagen VI in maintaining the structural integrity of adipose tissue and its potential as a therapeutic target for metabolic disorders.This study investigates the role of collagen VI in adipose tissue fibrosis and its impact on metabolic health. The authors found that during metabolic challenges, such as diabetes or obesity, the extracellular matrix in adipose tissue is upregulated, leading to a condition known as "adipose tissue fibrosis." Collagen VI, a key component of the extracellular matrix, is particularly enriched in adipose tissue and is upregulated in metabolically stressed conditions. In a genetic model of collagen VI deficiency (col6KOob/ob mice), the authors observed that these mice had lower body weights and improved metabolic parameters, including better glucose and lipid metabolism, reduced pancreatic hyperplasia, and decreased inflammation. The absence of collagen VI led to larger adipocyte sizes and a more flexible extracellular matrix, which enabled adipocytes to expand without the usual constraints, reducing shear stress and improving insulin signaling. Additionally, col6KOob/ob mice showed reduced inflammation and necrotic cell death, suggesting that the absence of collagen VI can mitigate the inflammatory and metabolic complications associated with obesity. These findings highlight the importance of collagen VI in maintaining the structural integrity of adipose tissue and its potential as a therapeutic target for metabolic disorders.