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Related Experiment Videos

Hypertension-linked decrease in the expression of brain gamma-adducin.

Hong Yang1, Sharon C Francis, Kathleen Sellers

  • 1Department of Physiology and Functional Genomics, College of Medicine and University of Florida McKnight Brain Institute, Gainesville, Fla 32610, USA.

Circulation Research
|October 5, 2002
PubMed
Summary
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Decreased gamma-adducin protein in the brain is linked to hypertension. This reduction affects neurotransmission and may play a role in the central regulation of blood pressure.

Area of Science:

  • Neuroscience
  • Cardiovascular Research
  • Molecular Biology

Background:

  • Gene profiling and adducin polymorphism studies suggest a link between cytosolic protein expression in the brain and hypertension.
  • Decreased adducin expression in the brain may be a key factor in the central control of hypertension.

Purpose of the Study:

  • To determine which adducin subunit gene expression is altered in the hypothalamus and brainstem of hypertensive rats.
  • To analyze the role of adducins in neurotransmission at the cellular level.

Main Methods:

  • Compared adducin subunit gene expression in Wistar Kyoto (WKY) and spontaneously hypertensive (SH) rats.
  • Investigated adducin expression in renin transgenic rats and neuronal cultures.
  • Assessed neuronal firing rate and the effects of angiotensin II and gamma-adducin antibodies.

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Main Results:

  • Gamma-adducin subunit expression was 40-60% lower in SH rats compared to WKY rats.
  • A similar decrease in gamma-adducin was observed in renin transgenic rats.
  • Angiotensin II decreased gamma-adducin expression and increased neuronal firing rate; a gamma-adducin antibody mimicked this effect.

Conclusions:

  • Decreased gamma-adducin expression in cardioregulatory brain areas is linked to hypertension.
  • This reduction may regulate neurotransmitter release, contributing to central blood pressure control.
  • Losartan treatment did not normalize gamma-adducin gene expression in SH rats.