Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel.

Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel. Research Abstract Details 

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Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel. Abstract Text:

Russell M Crawford,Sofija Jovanovi?,Grant R Budas,Anthony M Davies,Harish Lad,Roland H Wenger,Kevin A Robertson,Douglas J Roy,Harri J Ranki,Aleksandar Jovanovi?,

Chronic exposure to lower oxygen tension may increase cellular resistance to different types of acute metabolic stress. Here, we show that 24-h-long exposure to slightly decreased oxygen tension (partial pressure of oxygen (PO2) of 100 mm Hg instead of normal 144 mm Hg) confers resistance against acute hypoxia/reoxygenation-induced Ca2+ loading in heart-derived H9c2 cells. The number of ATP-sensitive K+ (K(ATP)) channels were increased in cells exposed to PO2 = 100 mm Hg relative to cells exposed to PO2 = 144 mm Hg. This was due to an increase in transcription of SUR2A, a K(ATP) channel regulatory subunit, but not Kir6.2, a K(ATP) channel pore-forming subunit. PO2 = 100 mm Hg also increased the SUR2 gene promoter activity. Experiments with cells overexpressing wild type of hypoxia-inducible factor (HIF)-1alpha and dominant negative HIF-1beta suggested that the HIF-1-signaling pathway did not participate in observed PO2-mediated regulation of SUR2A expression. On the other hand, NADH inhibited the effect of PO2 = 100 mm Hg but not the effect of PO2 = 20 mm Hg. LY 294002 and PD 184 352 prevented PO2-mediated regulation of K(ATP) channels, whereas rapamycin was without any effect. HMR 1098 inhibited the cytoprotective effect of PO2 = 100 mm Hg, and a decrease of PO2 from 144 to 100 mm Hg did not change the expression of any other gene, including those involved in stress and hypoxic response, as revealed by Affymetrix high density oligonucleotide arrays. We conclude that slight hypoxia activates HIF-1alpha-independent signaling cascade leading to an increase in SUR2A protein, a higher density of K(ATP) channels, and a cellular phenotype more resistant to acute metabolic stress.

Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel. Publishing Authors By Initials

RM Crawford,S Jovanovi?,GR Budas,AM Davies,H Lad,RH Wenger,KA Robertson,DJ Roy,HJ Ranki,A Jovanovi?,

For similar proteins: transcription factors research abstracts see: proteins: transcription factors research

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Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel. Journal Published:

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

Journal: The Journal of biological chemistry

VOLUME: 278

Page Numbers: 31444-55

Journal Abbreviation: J. Biol. Chem.

ISSN: 0021-9258

DAY: 5

MONTH: 06

YEAR: 2003

Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel. Information

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LANGUAGE: eng

NlmUniqueID: 2985121

Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel. Keywords Mesh Terms:

KEYWORDS: Transcription Factors

MESH TERMS: metabolism

Chemical & Substance for Abstract: Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel. Information

Substance Name: Protein-Serine-Threonine Kinases

Registry Number: EC 2.7.11.1

Grant and Affiliation Information for Chronic mild hypoxia protects heart-derived H9c2 cells against acute hypoxia/reoxygenation by regulating expression of the SUR2A subunit of the ATP-sensitive K+ channel.

AFFILIATION: Maternal and Child Health Sciences, Tayside Institute of Child Health, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, United Kingdom.

Country: United States

AGENCY: United Kingdom British He

GRANT: PG/02/091/14227

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MEDLINETA: J Biol Chem

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