Methylglyoxal-modified collagen promotes myofibroblast differentiation

Area of Science:

• Biochemistry
• Cell Biology
• Pathology

Background:

• Fibrosis is a common complication of diabetes mellitus affecting multiple organs.
• The precise mechanisms linking diabetes-induced extracellular matrix protein glycation to fibrotic lesion formation remain unclear.
• Myofibroblasts are key mediators of fibrosis.

Purpose of the Study:

• To investigate the impact of collagen glycation on the transformation of human cardiac fibroblasts into myofibroblasts.
• To elucidate the role of methylglyoxal (MGO), a glucose metabolite, in collagen glycation and subsequent fibrotic processes.

Main Methods:

• Collagen glycation was induced using methylglyoxal (MGO).
• Human cardiac fibroblasts were cultured on MGO-treated collagen.
• Assays included α-smooth muscle actin promoter activity, gene expression analysis (α-smooth muscle actin, ED-A fibronectin, cadherin), collagen gel contraction, cell migration (Transwell assays), and cell adhesion assays.
• The role of TGF-β and Rho kinase in MGO-collagen-induced α-smooth muscle actin expression was examined.

Main Results:

• Cells cultured on MGO-treated collagen showed increased myofibroblast marker expression (α-smooth muscle actin, ED-A fibronectin, cadherin).
• MGO treatment dose-dependently enhanced collagen gel contraction and increased cell migration.
• Cell adhesion to MGO-treated collagen was reduced, with inhibited formation of high-affinity β1 integrin-dependent adhesions.
• MGO-collagen-induced α-smooth muscle actin expression was dependent on TGF-β signaling.

Conclusions:

• Collagen glycation by MGO promotes myofibroblast formation and migration.
• These findings highlight a mechanism by which diabetes-induced collagen glycation contributes to fibrosis.
• Targeting collagen glycation may offer therapeutic strategies for diabetic fibrosis.