The long term objective is to provide a quantitative understanding of the myogenic and neurogenic processes which regulate gastrointestinal smooth muscle activity in experimental animals and in man. Smooth muscle from the internal anal sphincter, ileocolonic/ileocecal sphincter, muscularis mucosa of the esophagus, small and large intestines and the inner and outer circular muscle lamellae will be used. The areas of particular interest are: (1) the electrophysiological properties of the smooth muscle cell membrane in each of these areas; (2) the electrophysiological characteristics of neuroeffector responses; (3) the pattern of intramural innervation; (4) the identity of the neurotransmitters which cause excitation and inhibition; and (5) the electrophysiological and neurotransmission processes in normal and diseased human GI smooth muscle. The methods of approach will involve recording simultaneously mechanical and intracellular electrical activity, the recording of contractility of strips of muscle, radio-immunoassay of muscle to identify the type and content of peptides and radio-immunological and immunological techniques to identify the excitatory and inhibitiory transmitters. In vitro studies are planned. Dogs, cats, rabbits, guinea pigs and human GI smooth muscle will be used. These studies may be particularly relevant to understanding motor disturbances involving hypoganglionosis of the intrinsic plexuses in man. They man also be relevant to disturbances in anal continence in man.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
5R37DK017238-14
Application #
3483179
Study Section
General Medicine A Subcommittee 2 (GMA)
Project Start
1976-12-01
Project End
1990-11-30
Budget Start
1986-12-01
Budget End
1987-11-30
Support Year
14
Fiscal Year
1987
Total Cost
Indirect Cost
Name
Mayo Clinic, Rochester
Department
Type
DUNS #
City
Rochester
State
MN
Country
United States
Zip Code
55905
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Sha, Lei; Linden, David R; Farrugia, Gianrico et al. (2013) Hydrogen sulfide selectively potentiates central preganglionic fast nicotinic synaptic input in mouse superior mesenteric ganglion. J Neurosci 33:12638-46
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Linden, David R; Levitt, Michael D; Farrugia, Gianrico et al. (2010) Endogenous production of H2S in the gastrointestinal tract: still in search of a physiologic function. Antioxid Redox Signal 12:1135-46
Matsuda, Nilce Mitiko; Miller, Steven M; Szurszewski, Joseph H (2010) Heme-oxygenase-2 immunolabelling in pig jejunum. Acta Histochem 112:402-6
Sha, L; Farrugia, G; Linden, D R et al. (2010) The transwall gradient across the mouse colonic circular muscle layer is carbon monoxide dependent. FASEB J 24:3840-9
Ueda, Kazuo; Valdivia, Carmen; Medeiros-Domingo, Argelia et al. (2008) Syntrophin mutation associated with long QT syndrome through activation of the nNOS-SCN5A macromolecular complex. Proc Natl Acad Sci U S A 105:9355-60
Mazzone, Amelia; Farrugia, Gianrico (2007) Evolving concepts in the cellular control of gastrointestinal motility: neurogastroenterology and enteric sciences. Gastroenterol Clin North Am 36:499-513, vii

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