Role of nitric oxide in human esophageal circular smooth muscle in vitro.

Journal Article

The role of nitric oxide in human esophageal smooth muscle was examined. Immunostaining for constitutive nitric oxide synthase labeled nerve fibers and bundles within longitudinal and circular smooth muscle layers of resected tissue samples. Strips of circular muscle mounted in organ baths exhibited spontaneous contractions and active tone. When exposed to 5-second trains of electric field stimulation at 20 Hz, most strips exhibited intrastimulus "on" and poststimulus "off" contractions. Exposure to a 0.1 mumol/L (or greater) concentration of atropine converted "on" contractions to "on" relaxations and reduced "off" contractions by 63%. Exposure to NG-nitro-L-arginine resulted in concentration-dependent enhancement of "on" contractions and abolition of "off" contractions. Excess L-arginine enhanced the reversal of these effects. Sodium nitroprusside inhibited both spontaneous and evoked contractions. These results suggest that nitric oxide synthesis is a mediator of neural inhibition of human esophageal circular smooth muscle and is necessary for the occurrence of "off" contractions.

Full Text

Duke Authors

Cited Authors

  • Richards, WG; Stamler, JS; Kobzik, L; Sugarbaker, DJ

Published Date

  • July 1995

Published In

Volume / Issue

  • 110 / 1

Start / End Page

  • 157 - 164

PubMed ID

  • 7541879

Pubmed Central ID

  • 7541879

Electronic International Standard Serial Number (EISSN)

  • 1097-685X

International Standard Serial Number (ISSN)

  • 0022-5223

Digital Object Identifier (DOI)

  • 10.1016/s0022-5223(05)80021-2


  • eng