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Analytical Techniques for Assaying Nitric Oxide Bioactivity
11:28

Analytical Techniques for Assaying Nitric Oxide Bioactivity

Published on: June 18, 2012

Endogenously produced nitric oxide inhibits endothelial cell growth as demonstrated using novel antisense cell lines

J E Cartwright1, A P Johnstone, G S Whitley

  • 1Department of Biochemistry and Immunology, St. George's Hospital Medical School, Cranmer Terrace, London, SW17 ORE. j.cartwright@sghms.ac.uk

British Journal of Pharmacology
|August 26, 2000
PubMed

Insights

Nitric oxide (NO) derived from inducible nitric oxide synthase (iNOS) inhibits endothelial cell proliferation. This study demonstrates NO

Area of Science:

  • Endothelial cell biology
  • Vascular repair and angiogenesis
  • Nitric oxide signaling

Background:

  • Endothelial cell proliferation is crucial for vascular repair and angiogenesis.
  • The role of nitric oxide (NO) in endothelial cell proliferation is debated, with conflicting reports suggesting both inhibitory and promotional effects.
  • Inducible nitric oxide synthase (iNOS) is a key enzyme in NO production within endothelial cells.

Purpose of the Study:

  • To investigate the direct effect of endogenously produced NO from iNOS on endothelial cell proliferation.
  • To generate and characterize endothelial cell lines with suppressed iNOS expression.
  • To clarify the specific role of iNOS-derived NO in regulating endothelial cell growth.

Main Methods:

  • Generation of murine endothelial cell lines (sEnd-1) stably expressing antisense RNA against iNOS.
  • Stimulation of cell lines with lipopolysaccharide (LPS) and interferon-gamma (IFN-gamma).
  • Quantification of iNOS RNA, iNOS protein, and NO production.
  • Assessment of endothelial cell proliferation and cell death.

Main Results:

  • Antisense cells exhibited significantly reduced iNOS RNA and protein levels, and an 82% decrease in NO production compared to control cells after stimulation.
  • Control cells showed significant NO production and inhibited proliferation upon stimulation.
  • Antisense cells, producing minimal NO, maintained proliferation rates similar to unstimulated cells, with no observed differences in cell death.

Conclusions:

  • Endogenously produced nitric oxide (NO) derived from inducible nitric oxide synthase (iNOS) directly inhibits endothelial cell proliferation.
  • This study provides direct evidence clarifying the inhibitory role of iNOS-derived NO in endothelial cell growth.
  • The developed antisense RNA approach offers a novel method to study NO function, overcoming limitations of previous studies using NO donors or non-specific inhibitors.

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