Diabetes-Induced Aortic Wall Stiffening in Rats Linked to Collagen Cross-Linking

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Collagen cross-linking has been identified as a key contributor to aortic wall matrix stiffness in rats with diabetes, highlighting a potential mechanism for the increased risk of cardiovascular disease in individuals with diabetes. Researchers from the United States conducted a study to investigate the relationship between collagen cross-linking and aortic wall stiffness in streptozotocin-induced diabetic rats. The results demonstrated significant increases in maximum load, stress, and Young's modulus of elasticity in diabetic aortas compared to controls, indicating a stiffening of the blood vessel.

Key Takeaways:

  • The study found a significant increase in maximum load (26%), stress (22%), Young's modulus of elasticity (60%), and toughness (32%) in diabetic aortas compared to control.
  • The maximum strain of the diabetic rat aorta was significantly reduced by 20% compared to control rats, suggesting stiffening of the blood vessel.
  • Biochemical analysis revealed that the amount of total collagen increased by 21% in diabetic tissues compared to the control.
  • Sequential extractions of collagen showed that diabetic specimens yielded 34% more neutral salt-soluble collagen (NSC) than the control, 31% less pepsin-soluble collagen, and 56% more insoluble collagen (ISC).
  • A significant accumulation of advanced glycation end products (AGEs) was seen in pepsin- and collagenase-soluble collagen in diabetic vessels.
  • The altered biomechanical properties of the vessel wall were strongly correlated with the biochemistry of collagen.

Statistics:

  • 26% increase in maximum load in diabetic aortas compared to control.
  • 22% increase in stress in diabetic aortas compared to control.
  • 60% increase in Young's modulus of elasticity in diabetic aortas compared to control.
  • 32% increase in toughness in diabetic aortas compared to control.
  • 20% reduction in maximum strain of the diabetic rat aorta compared to control.
  • 21% increase in total collagen in diabetic tissues compared to control.
  • 34% increase in neutral salt-soluble collagen (NSC) in diabetic specimens compared to control.
  • 31% decrease in pepsin-soluble collagen in diabetic tissues compared to control.
  • 56% increase in insoluble collagen (ISC) in diabetic tissues compared to control.
  • Significant accumulation of advanced glycation end products (AGEs) in pepsin- and collagenase-soluble collagen in diabetic vessels.

Sources:

  • Kesava Reddy, G. Microvascular Research. (2004); 68(2):132-142. "AGE-related cross-linking of collagen is associated with aortic wall matrix stiffness in the pathogenesis of drug-induced diabetes in rats."
  • Reddy, G. K. Baylor Charles A Sammons Cancer Center, Suite 185, 3535 Worth Street, Dallas, TX 75246, USA. E-mail: kreddy_usa@rediffmail.com.