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Expression of renal and vascular angiotensin II receptor subtypes in children

M Viswanathan1, D M Selby, P E Ray

  • 1Center for Molecular Physiology, Children's Research Institute, Washington, DC 20010, USA. mviswana@cnmc.org

Pediatric Nephrology (Berlin, Germany)
|September 7, 2000
PubMed

Insights

This study reveals how angiotensin II receptor subtypes change in young children's kidneys and blood vessels. AT1 receptors dominate the brain arteries and kidney glomeruli, while AT2 receptors are prevalent in the aorta and other arteries.

Area of Science:

  • Cardiovascular Science
  • Renal Physiology
  • Developmental Biology

Background:

  • Angiotensin II (Ang II) AT1 receptors are key regulators of kidney and cardiovascular functions.
  • The role of AT2 receptors, abundant in fetal tissues, remains unclear.
  • Changes in AT2 receptor expression in pediatric kidneys and arteries are unstudied.

Purpose of the Study:

  • To investigate the expression and distribution of Angiotensin II receptor subtypes (AT1 and AT2) in pediatric renal and cardiovascular tissues.
  • To characterize these receptors in children during their first two years of life.

Main Methods:

  • Quantitative autoradiography was employed to localize and quantify AT1 and AT2 receptor subtypes.
  • Tissues examined included the kidney, interlobular arteries, thoracic aorta, and middle cerebral artery.

Main Results:

  • Renal glomeruli and middle cerebral arteries showed exclusive expression of AT1 receptors.
  • Thoracic aorta and interlobular arteries predominantly expressed AT2 receptors (over 80%).
  • Significant variation in Angiotensin II receptor subtype distribution was observed across different vascular tissues.

Conclusions:

  • The expression patterns of Angiotensin II receptor subtypes differ significantly between various vascular structures in young children.
  • These findings highlight tissue-specific regulation of Angiotensin II receptor subtypes during early development.

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