Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner.

Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner. Research Abstract Details 

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Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner. Abstract Text:

Harri J Ranki,Russell M Crawford,Grant R Budas,Aleksandar Jovanovi?,

The opening of sarcolemmal K(ATP) channels is considered to be an important endogenous cardioprotective mechanism. On the other hand, age-dependent changes in the myocardial susceptibility to ischemia and hypoxia have been observed in different species, including humans. Here, we have hypothesized that aging might be associated with the changes in sarcolemmal K(ATP) channels. Therefore, the main objective of the present study was to establish whether aging changes expression of cardiac sarcolemmal ATP-sensitive K+ (K(ATP)) channels. RT-PCR using primers specific for K(ATP) channel subunits, Kir6.2, Kir6.1 and SUR2A subunits was performed using total RNA from guinea-pig ventricular tissue. Whole cell electrophysiology was done on isolated guinea-pig ventricular cardiomyocytes. Western blotting using anti-Kir6.2 and anti-SUR2A antibodies was performed on cardiac membrane fraction. Tissue and cells were harvested from young and old, male and female guinea-pigs. RT-PCR analysis did not reveal significant age-related changes in levels of Kir6.1 or Kir6.2 mRNAs. However, levels of SUR2A were significantly lower in old than in young females. Such age-differences were not observed with cardiac tissue from male animals. In both old and young males, pinacidil (100 microM) induced outward currents. The difference between current density of pinacidil-sensitive component in females, but not males, was statistically significant. Western blotting analysis revealed higher levels of Kir6.2 and SUR2A proteins in cardiac membrane fraction from young than old females. The present study demonstrates that in females, but not males, aging is associated with decrease in number of cardiac K(ATP) channels which is due to decrease in levels of the SUR2A subunit.

Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner. Publishing Authors By Initials

HJ Ranki,RM Crawford,GR Budas,A Jovanovi?,

For similar epidemiologic factors: sex factors research abstracts see: epidemiologic factors: sex factors research

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Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Mechanisms of ageing and development

VOLUME: 123

Page Numbers: 695-705

Journal Abbreviation: Mech. Ageing Dev.

ISSN: 0047-6374

DAY: 31

MONTH: Mar

YEAR: 2002

Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner. Information

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LANGUAGE: eng

NlmUniqueID: 347227

Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner. Keywords Mesh Terms:

KEYWORDS: Sex Factors

MESH TERMS: metabolism

Chemical & Substance for Abstract: Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner. Information

Substance Name: Adenosine Triphosphate

Registry Number: 56-65-5

Grant and Affiliation Information for Ageing is associated with a decrease in the number of sarcolemmal ATP-sensitive K+ channels in a gender-dependent manner.

AFFILIATION: Tayside Institute of Child Health, Ninewells Hospital & Medical School, University of Dundee, DD1 9SY, Scotland, Dundee, UK.

Country: Ireland

AGENCY: United Kingdom British He

GRANT: PG/02/091/14227

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MEDLINETA: Mech Ageing Dev

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