Disruption of microtubular network attenuates histamine-induced dilation in rat mesenteric vessels

Carla De Arêdes Brum, Igor Dimitri Gama Duarte, R Clinton Webb, Romulo Leite

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Cytoplasmic microtubules are important in many cellular homeostatic processes in the cell. They regulate cell shape and movement as well as serving as a network by which vesicles and membrane-bound organelles can travel. Lately, there have been many studies demonstrating that microtubules are involved in regulation of intracellular signaling and, therefore, affect vascular reactivity. In this study, we tested the hypothesis that microtubule disruption attenuates agonist-induced endothelium-dependent vasodilation. Isolated mesenteric arterial bed from normotensive rats was preconstricted with phenylephrine, and dose-response curves for histamine, acetylcholine (ACh), sodium nitroprusside (SNP), and pinacidil were performed before and after incubation with nocodazole or colchicine. Treatment of the vascular beds with nocodazole or colchicine significantly attenuated histamine relaxation but did not change the ACh-, SNP-, or pinacidil-induced vasorelaxation. Nocodazole did not cause an additional attenuation of the histamine-mediated dilation in mesenteric vessels in the presence of Nω-nitro-L-arginine methyl ester, high extracellular K+, or K+ channel blockers. These data suggest that disruption of microtubules affects an essential endothelial component of histamine-mediated vasodilation in the mesenteric arterial bed. The mechanism(s) involved in this effect might be related to an impairment of endothelial NO synthesis, which might not be as important for the ACh as for the histamine vasodilator response in rat mesenteric vessels. These results demonstrate the importance of the microtubular system for endothelium-dependent NO-mediated smooth muscle relaxation.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Cell Physiology
Volume288
Issue number2 57-2
DOIs
StatePublished - Feb 1 2005

Fingerprint

Histamine
Dilatation
Nocodazole
Microtubules
Vasodilation
Pinacidil
Acetylcholine
Colchicine
Nitroprusside
Endothelium
Blood Vessels
Muscle Relaxation
Cell Shape
Phenylephrine
Vasodilator Agents
Organelles
Cell Movement
Smooth Muscle
Membranes

Keywords

  • Mesenteric arterial bed
  • Nitric oxide
  • Nocodazole

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

Cite this

Disruption of microtubular network attenuates histamine-induced dilation in rat mesenteric vessels. / Brum, Carla De Arêdes; Duarte, Igor Dimitri Gama; Webb, R Clinton; Leite, Romulo.

In: American Journal of Physiology - Cell Physiology, Vol. 288, No. 2 57-2, 01.02.2005.

Research output: Contribution to journalArticle

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