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Related Experiment Videos

Decrease in A1 adenosine receptors in adipocytes from spontaneously hypertensive rats.

A Green1, J L Johnson, D J DiPette

  • 1Department of Internal Medicine, University of Texas Medical Branch, Galveston 77550.

Metabolism: Clinical and Experimental
|December 1, 1990
PubMed
Summary
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Hypertension may cause insulin resistance through reduced adenosine receptors in fat cells, not fewer insulin receptors. This finding links hypertension to impaired glucose metabolism via adenosine signaling.

Area of Science:

  • Biochemistry
  • Physiology
  • Endocrinology

Background:

  • Insulin resistance is a known complication of hypertension.
  • The underlying mechanisms, specifically the role of adenosine receptors in adipocytes, remain unclear.

Purpose of the Study:

  • To investigate whether insulin resistance in hypertension is linked to decreased insulin receptors or adenosine receptors in adipocyte membranes.
  • To explore the potential role of adenosine metabolism in hypertension-related insulin resistance.

Main Methods:

  • Isolated adipocyte membranes from spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto (WKy) rats.
  • Assayed membranes for insulin receptors and A1 adenosine receptors using radioligand binding assays.
  • Measured 5'-nucleotidase activity to assess adenosine production capacity.

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Main Results:

  • Adipocyte membranes from SHR and WKy rats showed equal binding for insulin.
  • SHR membranes exhibited approximately 25% less binding for an A1 adenosine receptor agonist (125I-HPIA) compared to WKy.
  • Scatchard analysis revealed a lower number of A1 adenosine receptors in SHR adipocytes, with similar affinity.
  • 5'-Nucleotidase activity was ~40% higher in SHR membranes, suggesting increased adenosine production.

Conclusions:

  • Hypertension is associated with a reduced number of A1 adenosine receptors in adipocytes.
  • Increased adenosine production in SHR adipose tissue may lead to adenosine receptor down-regulation.
  • This adenosine receptor down-regulation could contribute to the insulin resistance observed in hypertension.