Overexpression of endothelium nitric oxide synthase reverses the diminished vasorelaxation in the hindlimb vasculature in ischemic heart failure in vivo

Mohamed A. Gaballa, Steven Goldman

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

After myocardial infarction (MI), nitric oxide (NO)-mediated vasorelaxation is attenuated in both conduit and resistance arteries. To determine if the attenuated vasorelaxation after MI is due to downregulation of eNOS protein, pharmacological immunoblotting, and gene transfer of eNOS were performed in rats 3 weeks after MI. Gene transfer was accomplished using a 'first-generation' serotype 5, replication-deficient, adenoviral vector (1.2 x 109 pfus) containing eNOS cDNA in the hindlimb vasculature for 30 min. Five days after infection, overexpression of eNOS protein was confirmed by immunohistochemical staining and immunoblotting. Recombinant gene expression was localized primarily to the vascular endothelial cells. After MI, eNOS protein level decreased (3.3 ± 0.9 vs 2.1 ± 0.8 intensity units/μg protein, n = 6, P < 0.05): after gene transfer it increased (P < 0.05) two-fold to 4.3 ± 1.2 intensity units/μg protein, n = 5. There were no changes in hemodynamics in MI rats transfected with eNOS. Acetylcholine (ACh)-stimulated vasorelaxation was decreased (P < 0.05)) by 30% after MI and was restored to normal with eNOS transfection. Addition of 100 μM N(G)-nitro-L-arginine methyl ester (L-NAME) abolished the difference between sham, MI, and MI transfected rats. L-arginine (1 mM) restored the ACh-response in MI-transfected rats toward control, but it did not eliminate the difference between MI and sham rats. We conclude that the attenuated endothelial NO-mediated vasorelaxation in the hindlimb after MI is due to a downregulation of eNOS protein and overespression of eNOS transgene restores normal endothelial N0-mediated vasorelaxation.

Original languageEnglish (US)
Pages (from-to)1243-1252
Number of pages10
JournalJournal of Molecular and Cellular Cardiology
Volume31
Issue number6
DOIs
StatePublished - Jun 1999

Fingerprint

Hindlimb
Vasodilation
Nitric Oxide Synthase
Endothelium
Heart Failure
Myocardial Infarction
Proteins
NG-Nitroarginine Methyl Ester
Immunoblotting
Acetylcholine
Nitric Oxide
Down-Regulation
Genes
Transgenes
Transfection
Arginine
Endothelial Cells
Complementary DNA
Arteries
Hemodynamics

Keywords

  • Gene transfer
  • Hindlimb vasculature
  • Myocardial infarction
  • Nitric oxide

ASJC Scopus subject areas

  • Molecular Biology
  • Cardiology and Cardiovascular Medicine

Cite this

@article{56350e52cc88440a9a47518ef261ca86,
title = "Overexpression of endothelium nitric oxide synthase reverses the diminished vasorelaxation in the hindlimb vasculature in ischemic heart failure in vivo",
abstract = "After myocardial infarction (MI), nitric oxide (NO)-mediated vasorelaxation is attenuated in both conduit and resistance arteries. To determine if the attenuated vasorelaxation after MI is due to downregulation of eNOS protein, pharmacological immunoblotting, and gene transfer of eNOS were performed in rats 3 weeks after MI. Gene transfer was accomplished using a 'first-generation' serotype 5, replication-deficient, adenoviral vector (1.2 x 109 pfus) containing eNOS cDNA in the hindlimb vasculature for 30 min. Five days after infection, overexpression of eNOS protein was confirmed by immunohistochemical staining and immunoblotting. Recombinant gene expression was localized primarily to the vascular endothelial cells. After MI, eNOS protein level decreased (3.3 ± 0.9 vs 2.1 ± 0.8 intensity units/μg protein, n = 6, P < 0.05): after gene transfer it increased (P < 0.05) two-fold to 4.3 ± 1.2 intensity units/μg protein, n = 5. There were no changes in hemodynamics in MI rats transfected with eNOS. Acetylcholine (ACh)-stimulated vasorelaxation was decreased (P < 0.05)) by 30{\%} after MI and was restored to normal with eNOS transfection. Addition of 100 μM N(G)-nitro-L-arginine methyl ester (L-NAME) abolished the difference between sham, MI, and MI transfected rats. L-arginine (1 mM) restored the ACh-response in MI-transfected rats toward control, but it did not eliminate the difference between MI and sham rats. We conclude that the attenuated endothelial NO-mediated vasorelaxation in the hindlimb after MI is due to a downregulation of eNOS protein and overespression of eNOS transgene restores normal endothelial N0-mediated vasorelaxation.",
keywords = "Gene transfer, Hindlimb vasculature, Myocardial infarction, Nitric oxide",
author = "Gaballa, {Mohamed A.} and Steven Goldman",
year = "1999",
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pages = "1243--1252",
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T1 - Overexpression of endothelium nitric oxide synthase reverses the diminished vasorelaxation in the hindlimb vasculature in ischemic heart failure in vivo

AU - Gaballa, Mohamed A.

AU - Goldman, Steven

PY - 1999/6

Y1 - 1999/6

N2 - After myocardial infarction (MI), nitric oxide (NO)-mediated vasorelaxation is attenuated in both conduit and resistance arteries. To determine if the attenuated vasorelaxation after MI is due to downregulation of eNOS protein, pharmacological immunoblotting, and gene transfer of eNOS were performed in rats 3 weeks after MI. Gene transfer was accomplished using a 'first-generation' serotype 5, replication-deficient, adenoviral vector (1.2 x 109 pfus) containing eNOS cDNA in the hindlimb vasculature for 30 min. Five days after infection, overexpression of eNOS protein was confirmed by immunohistochemical staining and immunoblotting. Recombinant gene expression was localized primarily to the vascular endothelial cells. After MI, eNOS protein level decreased (3.3 ± 0.9 vs 2.1 ± 0.8 intensity units/μg protein, n = 6, P < 0.05): after gene transfer it increased (P < 0.05) two-fold to 4.3 ± 1.2 intensity units/μg protein, n = 5. There were no changes in hemodynamics in MI rats transfected with eNOS. Acetylcholine (ACh)-stimulated vasorelaxation was decreased (P < 0.05)) by 30% after MI and was restored to normal with eNOS transfection. Addition of 100 μM N(G)-nitro-L-arginine methyl ester (L-NAME) abolished the difference between sham, MI, and MI transfected rats. L-arginine (1 mM) restored the ACh-response in MI-transfected rats toward control, but it did not eliminate the difference between MI and sham rats. We conclude that the attenuated endothelial NO-mediated vasorelaxation in the hindlimb after MI is due to a downregulation of eNOS protein and overespression of eNOS transgene restores normal endothelial N0-mediated vasorelaxation.

AB - After myocardial infarction (MI), nitric oxide (NO)-mediated vasorelaxation is attenuated in both conduit and resistance arteries. To determine if the attenuated vasorelaxation after MI is due to downregulation of eNOS protein, pharmacological immunoblotting, and gene transfer of eNOS were performed in rats 3 weeks after MI. Gene transfer was accomplished using a 'first-generation' serotype 5, replication-deficient, adenoviral vector (1.2 x 109 pfus) containing eNOS cDNA in the hindlimb vasculature for 30 min. Five days after infection, overexpression of eNOS protein was confirmed by immunohistochemical staining and immunoblotting. Recombinant gene expression was localized primarily to the vascular endothelial cells. After MI, eNOS protein level decreased (3.3 ± 0.9 vs 2.1 ± 0.8 intensity units/μg protein, n = 6, P < 0.05): after gene transfer it increased (P < 0.05) two-fold to 4.3 ± 1.2 intensity units/μg protein, n = 5. There were no changes in hemodynamics in MI rats transfected with eNOS. Acetylcholine (ACh)-stimulated vasorelaxation was decreased (P < 0.05)) by 30% after MI and was restored to normal with eNOS transfection. Addition of 100 μM N(G)-nitro-L-arginine methyl ester (L-NAME) abolished the difference between sham, MI, and MI transfected rats. L-arginine (1 mM) restored the ACh-response in MI-transfected rats toward control, but it did not eliminate the difference between MI and sham rats. We conclude that the attenuated endothelial NO-mediated vasorelaxation in the hindlimb after MI is due to a downregulation of eNOS protein and overespression of eNOS transgene restores normal endothelial N0-mediated vasorelaxation.

KW - Gene transfer

KW - Hindlimb vasculature

KW - Myocardial infarction

KW - Nitric oxide

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AN - SCOPUS:0033151981

VL - 31

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EP - 1252

JO - Journal of Molecular and Cellular Cardiology

JF - Journal of Molecular and Cellular Cardiology

SN - 0022-2828

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