Induction of NO synthase in rat cardiac microvascular endothelial cells by IL-1β and IFN-γ

J. L. Balligand, D. Ungureanu-Longrois, W. W. Simmons, L. Kobzik, C. J. Lowenstein, S. Lamas, R. A. Kelly, T. W. Smith, T. Michel

Research output: Contribution to journalArticle

Abstract

There are important phenotypic differences between endothelial cells of large vessels and the microvasculature and among microvascular endothelial cells isolated from different tissues and organs. In contrast to most macrovascular endothelial cells, we demonstrate that cultured cardiac microvascular endothelial cells (CMEC) have no detectable constitutive NO synthase (NOS) activity but have a robust increase in NOS activity in response to specific inflammatory cytokines. To determine the identity of the inducible NOS (iNOS) isoform(s) induced by cytokines, we used reverse- transcription polymerase chain reaction techniques to clone and sequence a 217-bp cDNA fragment from CMEC cultures pretreated with interleukin-1β (IL- 1β) and interferon-γ (IFN-γ) that was identical to the corresponding portion of the murine macrophage iNOS cDNA. By use of this CMEC iNOS cDNA as a probe in Northern analyses, IL-1β, but not IFN-γ, increased iNOS mRNA content in CMEC, although IFN-γ markedly potentiated iNOS induction in these cells. In IL-1β- and IFN-γ-pretreated CMEC, dexamethasone only minimally suppressed the rise in iNOS mRNA, protein abundance, or maximal iNOS enzyme activity in whole cell lysates but suppressed nitrite production by 60% in intact CMEC. Dual labeling of cytokine-pretreated CMEC in primary culture with an anti-iNOS antiserum and a fluorescein-labeled lectin specific for the microvascular endothelium of rat heart (GS-1) confirmed the presence of iNOS expression in these cells. iNOS was also detected in microvascular endothelium in situ in ventricular muscle from lipopolysaccharide-, but not sham-injected, rat hearts. The induction of iNOS in the endothelium of the cardiac microvasculature may have important implications for understanding the pathophysiology of some forms of inflammatory cardiomyopathies.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume268
Issue number3 37-3
StatePublished - 1995
Externally publishedYes

Fingerprint

interleukin-1
interferons
Interleukin-1
Nitric Oxide Synthase
Interferons
endothelial cells
Endothelial Cells
rats
endothelium
Endothelium
cytokines
Complementary DNA
Cytokines
Microvessels
heart
Messenger RNA
cardiomyopathy
Nitric Oxide Synthase Type II
cells
fluorescein

Keywords

  • cardiac myocytes
  • cytokine
  • endothelium
  • glucocorticoid
  • lipopolysaccharide

ASJC Scopus subject areas

  • Physiology
  • Agricultural and Biological Sciences(all)

Cite this

Balligand, J. L., Ungureanu-Longrois, D., Simmons, W. W., Kobzik, L., Lowenstein, C. J., Lamas, S., ... Michel, T. (1995). Induction of NO synthase in rat cardiac microvascular endothelial cells by IL-1β and IFN-γ. American Journal of Physiology - Heart and Circulatory Physiology, 268(3 37-3).

Induction of NO synthase in rat cardiac microvascular endothelial cells by IL-1β and IFN-γ. / Balligand, J. L.; Ungureanu-Longrois, D.; Simmons, W. W.; Kobzik, L.; Lowenstein, C. J.; Lamas, S.; Kelly, R. A.; Smith, T. W.; Michel, T.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 268, No. 3 37-3, 1995.

Research output: Contribution to journalArticle

Balligand, JL, Ungureanu-Longrois, D, Simmons, WW, Kobzik, L, Lowenstein, CJ, Lamas, S, Kelly, RA, Smith, TW & Michel, T 1995, 'Induction of NO synthase in rat cardiac microvascular endothelial cells by IL-1β and IFN-γ', American Journal of Physiology - Heart and Circulatory Physiology, vol. 268, no. 3 37-3.
Balligand JL, Ungureanu-Longrois D, Simmons WW, Kobzik L, Lowenstein CJ, Lamas S et al. Induction of NO synthase in rat cardiac microvascular endothelial cells by IL-1β and IFN-γ. American Journal of Physiology - Heart and Circulatory Physiology. 1995;268(3 37-3).
Balligand, J. L. ; Ungureanu-Longrois, D. ; Simmons, W. W. ; Kobzik, L. ; Lowenstein, C. J. ; Lamas, S. ; Kelly, R. A. ; Smith, T. W. ; Michel, T. / Induction of NO synthase in rat cardiac microvascular endothelial cells by IL-1β and IFN-γ. In: American Journal of Physiology - Heart and Circulatory Physiology. 1995 ; Vol. 268, No. 3 37-3.
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abstract = "There are important phenotypic differences between endothelial cells of large vessels and the microvasculature and among microvascular endothelial cells isolated from different tissues and organs. In contrast to most macrovascular endothelial cells, we demonstrate that cultured cardiac microvascular endothelial cells (CMEC) have no detectable constitutive NO synthase (NOS) activity but have a robust increase in NOS activity in response to specific inflammatory cytokines. To determine the identity of the inducible NOS (iNOS) isoform(s) induced by cytokines, we used reverse- transcription polymerase chain reaction techniques to clone and sequence a 217-bp cDNA fragment from CMEC cultures pretreated with interleukin-1β (IL- 1β) and interferon-γ (IFN-γ) that was identical to the corresponding portion of the murine macrophage iNOS cDNA. By use of this CMEC iNOS cDNA as a probe in Northern analyses, IL-1β, but not IFN-γ, increased iNOS mRNA content in CMEC, although IFN-γ markedly potentiated iNOS induction in these cells. In IL-1β- and IFN-γ-pretreated CMEC, dexamethasone only minimally suppressed the rise in iNOS mRNA, protein abundance, or maximal iNOS enzyme activity in whole cell lysates but suppressed nitrite production by 60{\%} in intact CMEC. Dual labeling of cytokine-pretreated CMEC in primary culture with an anti-iNOS antiserum and a fluorescein-labeled lectin specific for the microvascular endothelium of rat heart (GS-1) confirmed the presence of iNOS expression in these cells. iNOS was also detected in microvascular endothelium in situ in ventricular muscle from lipopolysaccharide-, but not sham-injected, rat hearts. The induction of iNOS in the endothelium of the cardiac microvasculature may have important implications for understanding the pathophysiology of some forms of inflammatory cardiomyopathies.",
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