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Renal perivascular adipose tissue: Form and function.

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Renal perivascular adipose tissue (RPVAT) stores norepinephrine (NE). This NE can be released independently of nerve input, potentially influencing renal artery function and blood pressure.

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Area of Science:

  • Cardiovascular Physiology
  • Adipose Tissue Biology
  • Renal Function

Background:

  • Renal sympathetic activity increases blood pressure by releasing norepinephrine (NE) onto renal arteries.
  • The role of renal perivascular adipose tissue (RPVAT) in storing and releasing NE remains unclear.

Purpose of the Study:

  • To investigate if RPVAT contains a releasable pool of NE.
  • To determine if RPVAT-derived NE can influence renal vascular function independently of sympathetic innervation.

Main Methods:

  • RPVAT, thoracic aortic PVAT, and mesenteric PVAT were collected from Sprague Dawley rats.
  • NE content was quantified, and NE localization in RPVAT adipocytes was visualized using immunohistochemistry.
  • Isolated renal arteries with and without RPVAT were challenged with NE and tyramine, with responses assessed using receptor antagonists and transporter inhibitors.

Main Results:

  • RPVAT, thoracic aortic PVAT, and mesenteric PVAT all contained NE, with RPVAT showing significant levels.
  • Tyramine-induced contraction was greater in renal arteries with RPVAT, suggesting NE release from the tissue.
  • This tyramine effect was blocked by α1-adrenoceptor and NE transporter inhibitors, confirming NE release.
  • Renal denervation reduced RPVAT NE content but did not affect tyramine-induced contractions, indicating an innervation-independent NE pool.

Conclusions:

  • RPVAT contains a releasable pool of norepinephrine.
  • This NE pool is independent of renal sympathetic nerve input.
  • RPVAT-derived NE has the potential to modulate renal arterial function.