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Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
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Vascular remodeling: implications for small artery function and target organ damage.

Kazuhiko Sonoyama1, Adam Greenstein, Anna Price

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Essential hypertension causes inward arterial remodeling via myogenic tone. In diabetes, damaged myogenic autoregulation leads to outward hypertrophic remodeling, increasing hypertensive injury risk.

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Area of Science:

  • Vascular biology
  • Cardiovascular research
  • Hypertension and diabetes

Background:

  • Essential hypertension is linked to eutrophic inward remodeling in small arteries, characterized by reduced lumen diameter and increased wall thickness.
  • This remodeling was previously attributed to smooth muscle cell hypertrophy/hyperplasia but is now understood to involve myogenic tone, an artery's ability to contract in response to intraluminal pressure.
  • Myogenic autoregulation is crucial for stabilizing distal pressures and preventing organ damage; its impairment leads to target organ injury.

Purpose of the Study:

  • To investigate the arterial remodeling changes in hypertension, particularly when myogenic autoregulation is impaired.
  • To explore the link between impaired myogenic autoregulation, hypertrophic remodeling, and the increased susceptibility to hypertensive injury in type 2 diabetes.
  • To examine the role of specific integrins (alpha5beta1 and alphanubeta3) in myogenic autoregulation and remodeling, and their potential dysfunction in diabetes.

Main Methods:

  • Observational studies analyzing arterial remodeling in animal models and human small arteries.
  • Comparison of arterial wall structure and lumen diameter in hypertensive states with and without impaired myogenic autoregulation.
  • Examination of small arteries from patients with type 2 diabetes.

Main Results:

  • In animal models, impaired myogenic autoregulation during hypertension shifts eutrophic remodeling to hypertrophic remodeling (outward growth with preserved lumen diameter).
  • This hypertrophic remodeling pattern has been independently observed in small arteries from patients with type 2 diabetes.
  • Integrins alpha5beta1 and alphanubeta3 are identified as essential for normal myogenic autoregulation and eutrophic remodeling.

Conclusions:

  • Impaired myogenic autoregulation in diabetes may drive hypertrophic remodeling, explaining the heightened risk of hypertensive injury in these patients.
  • Dysfunction of integrins alpha5beta1 and alphanubeta3 could be a key factor in the altered remodeling and increased vascular damage seen in diabetic patients.
  • Understanding these mechanisms offers potential targets for preventing or mitigating hypertensive injury in diabetes.