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Related Experiment Videos

Nitric oxide as a signal in thyroid.

R Z Esteves1, J van Sande, J E Dumont

  • 1Institute of Interdisciplinary Research, School of Medicine, Free University of Brussels, Belgium.

Molecular and Cellular Endocrinology
|December 1, 1992
PubMed
Summary

Nitric oxide (NO) appears to mediate thyroid cGMP responses to calcium signaling. Inhibitors of NO synthesis blocked these effects, suggesting NO

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Area of Science:

  • Endocrinology
  • Cell Signaling
  • Molecular Biology

Background:

  • Agonist activation of the PIP2/calcium cascade in the thyroid enhances cGMP accumulation via soluble guanylate cyclase.
  • Nitric oxide (NO) is a key physiological signal for soluble guanylate cyclase in many tissues, with synthesis regulated by intracellular calcium (Ca2+).

Purpose of the Study:

  • To investigate the potential role of NO as an intermediate in the thyroid's cGMP response to the PIP2/calcium cascade.
  • To determine if NO is an autocrine or paracrine factor in thyroid function.

Main Methods:

  • Incubation of dog thyroid slices with carbamylcholine or A23187 to measure intracellular Ca2+ and cGMP levels.
  • Use of NG-Monomethyl-L-arginine (NMMA), an inhibitor of nitric oxide synthase, to assess its effect on cGMP responses.
  • Application of sodium nitroprusside to directly activate soluble guanylate cyclase and methylene blue to block NO-mediated activation.

Main Results:

  • Carbamylcholine and A23187 significantly increased intracellular Ca2+ and cGMP levels in dog thyroid slices.
  • NMMA inhibited these carbamylcholine- and A23187-induced cGMP increases, but did not affect responses to sodium nitroprusside.
  • Arginine administration reversed the inhibitory effect of NMMA.
  • Methylene blue reduced both basal and stimulated cGMP levels, as well as the stimulatory effects of carbamylcholine and A23187.

Conclusions:

  • Results suggest that nitric oxide (NO) is an intermediate in the thyroid's cGMP response to PIP2/calcium cascade activation.
  • NO may function as an important autocrine and/or paracrine factor within the thyroid gland.
  • These findings elucidate a novel signaling pathway involving NO in thyroid physiology.

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