Preconditioning of bovine endothelial cells

The protective effect is mediated by an adenosine A2 receptor through a protein kinase C signaling pathway

Xiaobo Zhou, Xiaolin Zhai, Muhammad Ashraf

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

We tested the hypothesis that anoxic preconditioning could protect coronary endothelial cells against anoxic and reoxygenation injury and that this preconditioning effect could be mediated by an adenosine A2 receptor via the protein kinase C (PKC) pathway. Cells were preconditioned with 10- minute anoxia and 10-minute reoxygenation and were then subjected to anoxia for 60 minutes, followed by 120 minutes of reoxygenation. In some groups, the preconditioning effect was prevented by 8-sulfophenyltheophylline (SPT [50 μmol/L], a nonselective adenosine receptor antagonist) or calphostin C (100 nmol/L, a PKC inhibitor). In other groups, 2-p-(2- carboxyethyl)phenethylamino-5'-N-ethylcarboxamidoadenosine (CGS-21680 [20 nmol/L], an adenosine A2 receptor agonist), R-(-)-N6-(2-phenylisopropyl)- adenosine (R-PIA [50 nmol/L], an adenosine A1 receptor agonist), or 4β- phorbol 12-myristate 13-acetate (PMA) [100 nmol/L], a PKC activator) was given as a pretreatment to mimic the preconditioning effect. Endothelial cells were also pretreated with 100 nmol/L calphostin C to confirm whether inhibition of PKC can block the effects of adenosine A2 receptor activation by CGS-21680 on anoxia and reoxygenation injury. Preconditioning reduced LDH release, increased adenosine release, promoted translocation of PKC from cytosol to membrane, increased cell viability, and preserved ATP content and cell morphology. Pretreatment with either CGS-21680 or PMA resulted in protection similar to that seen with anoxic preconditioning. The protection was totally abolished by SPT or calphostin C. The results suggest that (1) preconditioning protects coronary endothelial cells against anoxia and reoxygenation injury, (2) the protection is probably mediated by activation of adenosine A2 receptors through the PKC pathway, and (3) the preservation of endothelial cells may be one of the mechanisms of myocardial preconditioning.

Original languageEnglish (US)
Pages (from-to)73-81
Number of pages9
JournalCirculation research
Volume78
Issue number1
DOIs
StatePublished - Jan 1 1996

Fingerprint

Adenosine A2 Receptors
Protein Kinase C
Endothelial Cells
Adenosine
Wounds and Injuries
Acetates
Adenosine A2 Receptor Agonists
Myocardial Ischemic Preconditioning
Adenosine A1 Receptor Agonists
Purinergic P1 Receptor Antagonists
Cell Hypoxia
Protein C Inhibitor
Protein Kinase Inhibitors
Cytosol
Cell Survival
Adenosine Triphosphate
Membranes

Keywords

  • endothelial cells
  • preconditioning
  • protein kinase C

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

@article{2663ae68142b4f2ba2d6c2ebc663b902,
title = "Preconditioning of bovine endothelial cells: The protective effect is mediated by an adenosine A2 receptor through a protein kinase C signaling pathway",
abstract = "We tested the hypothesis that anoxic preconditioning could protect coronary endothelial cells against anoxic and reoxygenation injury and that this preconditioning effect could be mediated by an adenosine A2 receptor via the protein kinase C (PKC) pathway. Cells were preconditioned with 10- minute anoxia and 10-minute reoxygenation and were then subjected to anoxia for 60 minutes, followed by 120 minutes of reoxygenation. In some groups, the preconditioning effect was prevented by 8-sulfophenyltheophylline (SPT [50 μmol/L], a nonselective adenosine receptor antagonist) or calphostin C (100 nmol/L, a PKC inhibitor). In other groups, 2-p-(2- carboxyethyl)phenethylamino-5'-N-ethylcarboxamidoadenosine (CGS-21680 [20 nmol/L], an adenosine A2 receptor agonist), R-(-)-N6-(2-phenylisopropyl)- adenosine (R-PIA [50 nmol/L], an adenosine A1 receptor agonist), or 4β- phorbol 12-myristate 13-acetate (PMA) [100 nmol/L], a PKC activator) was given as a pretreatment to mimic the preconditioning effect. Endothelial cells were also pretreated with 100 nmol/L calphostin C to confirm whether inhibition of PKC can block the effects of adenosine A2 receptor activation by CGS-21680 on anoxia and reoxygenation injury. Preconditioning reduced LDH release, increased adenosine release, promoted translocation of PKC from cytosol to membrane, increased cell viability, and preserved ATP content and cell morphology. Pretreatment with either CGS-21680 or PMA resulted in protection similar to that seen with anoxic preconditioning. The protection was totally abolished by SPT or calphostin C. The results suggest that (1) preconditioning protects coronary endothelial cells against anoxia and reoxygenation injury, (2) the protection is probably mediated by activation of adenosine A2 receptors through the PKC pathway, and (3) the preservation of endothelial cells may be one of the mechanisms of myocardial preconditioning.",
keywords = "endothelial cells, preconditioning, protein kinase C",
author = "Xiaobo Zhou and Xiaolin Zhai and Muhammad Ashraf",
year = "1996",
month = "1",
day = "1",
doi = "10.1161/01.RES.78.1.73",
language = "English (US)",
volume = "78",
pages = "73--81",
journal = "Circulation Research",
issn = "0009-7330",
publisher = "Lippincott Williams and Wilkins",
number = "1",

}

TY - JOUR

T1 - Preconditioning of bovine endothelial cells

T2 - The protective effect is mediated by an adenosine A2 receptor through a protein kinase C signaling pathway

AU - Zhou, Xiaobo

AU - Zhai, Xiaolin

AU - Ashraf, Muhammad

PY - 1996/1/1

Y1 - 1996/1/1

N2 - We tested the hypothesis that anoxic preconditioning could protect coronary endothelial cells against anoxic and reoxygenation injury and that this preconditioning effect could be mediated by an adenosine A2 receptor via the protein kinase C (PKC) pathway. Cells were preconditioned with 10- minute anoxia and 10-minute reoxygenation and were then subjected to anoxia for 60 minutes, followed by 120 minutes of reoxygenation. In some groups, the preconditioning effect was prevented by 8-sulfophenyltheophylline (SPT [50 μmol/L], a nonselective adenosine receptor antagonist) or calphostin C (100 nmol/L, a PKC inhibitor). In other groups, 2-p-(2- carboxyethyl)phenethylamino-5'-N-ethylcarboxamidoadenosine (CGS-21680 [20 nmol/L], an adenosine A2 receptor agonist), R-(-)-N6-(2-phenylisopropyl)- adenosine (R-PIA [50 nmol/L], an adenosine A1 receptor agonist), or 4β- phorbol 12-myristate 13-acetate (PMA) [100 nmol/L], a PKC activator) was given as a pretreatment to mimic the preconditioning effect. Endothelial cells were also pretreated with 100 nmol/L calphostin C to confirm whether inhibition of PKC can block the effects of adenosine A2 receptor activation by CGS-21680 on anoxia and reoxygenation injury. Preconditioning reduced LDH release, increased adenosine release, promoted translocation of PKC from cytosol to membrane, increased cell viability, and preserved ATP content and cell morphology. Pretreatment with either CGS-21680 or PMA resulted in protection similar to that seen with anoxic preconditioning. The protection was totally abolished by SPT or calphostin C. The results suggest that (1) preconditioning protects coronary endothelial cells against anoxia and reoxygenation injury, (2) the protection is probably mediated by activation of adenosine A2 receptors through the PKC pathway, and (3) the preservation of endothelial cells may be one of the mechanisms of myocardial preconditioning.

AB - We tested the hypothesis that anoxic preconditioning could protect coronary endothelial cells against anoxic and reoxygenation injury and that this preconditioning effect could be mediated by an adenosine A2 receptor via the protein kinase C (PKC) pathway. Cells were preconditioned with 10- minute anoxia and 10-minute reoxygenation and were then subjected to anoxia for 60 minutes, followed by 120 minutes of reoxygenation. In some groups, the preconditioning effect was prevented by 8-sulfophenyltheophylline (SPT [50 μmol/L], a nonselective adenosine receptor antagonist) or calphostin C (100 nmol/L, a PKC inhibitor). In other groups, 2-p-(2- carboxyethyl)phenethylamino-5'-N-ethylcarboxamidoadenosine (CGS-21680 [20 nmol/L], an adenosine A2 receptor agonist), R-(-)-N6-(2-phenylisopropyl)- adenosine (R-PIA [50 nmol/L], an adenosine A1 receptor agonist), or 4β- phorbol 12-myristate 13-acetate (PMA) [100 nmol/L], a PKC activator) was given as a pretreatment to mimic the preconditioning effect. Endothelial cells were also pretreated with 100 nmol/L calphostin C to confirm whether inhibition of PKC can block the effects of adenosine A2 receptor activation by CGS-21680 on anoxia and reoxygenation injury. Preconditioning reduced LDH release, increased adenosine release, promoted translocation of PKC from cytosol to membrane, increased cell viability, and preserved ATP content and cell morphology. Pretreatment with either CGS-21680 or PMA resulted in protection similar to that seen with anoxic preconditioning. The protection was totally abolished by SPT or calphostin C. The results suggest that (1) preconditioning protects coronary endothelial cells against anoxia and reoxygenation injury, (2) the protection is probably mediated by activation of adenosine A2 receptors through the PKC pathway, and (3) the preservation of endothelial cells may be one of the mechanisms of myocardial preconditioning.

KW - endothelial cells

KW - preconditioning

KW - protein kinase C

UR - http://www.scopus.com/inward/record.url?scp=0030023207&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030023207&partnerID=8YFLogxK

U2 - 10.1161/01.RES.78.1.73

DO - 10.1161/01.RES.78.1.73

M3 - Article

VL - 78

SP - 73

EP - 81

JO - Circulation Research

JF - Circulation Research

SN - 0009-7330

IS - 1

ER -