Gastrointestinal tract smooth muscle

Gastrointestinal tract smooth muscle refers to the muscle tissue lining the walls of the gastrointestinal (GI) tract, from the esophagus to the rectum. It is composed of spindle-shaped smooth muscle cells arranged in inner circular and outer longitudinal layers. The coordinated contractions of these muscle layers, regulated by the autonomic nervous system and local pacemaker cells (interstitial cells of Cajal), are essential for peristalsis and mixing, enabling the digestion and absorption of food and the movement of waste. GI smooth muscle responds to neurotransmitters, hormones, and mechanical stimuli, operating involuntarily. Abnormalities in function or regulation of this tissue underlie several GI motility disorders, but the tissue itself is not a molecular therapeutic target; rather, diverse molecular targets within or regulating this tissue are modulated for therapeutic effect[1][2][4][6][7][8]. "Gastrointestinal tract smooth muscle" is a tissue, not a canonical therapeutic target such as a receptor, channel, or enzyme. Drugs act upon many molecular targets within this tissue (e.g., muscarinic acetylcholine receptor M3, serotonin receptors, calcium channels), but not upon the smooth muscle tissue as a single entity[1][2][4][6]. The correct use for structured drug/discovery databases is to specify the particular molecular target (such as "muscarinic acetylcholine receptor M3" or "L-type calcium channel") relevant to GI smooth muscle, rather than the tissue type itself.

Other names

gastrointestinal smooth muscleGI tract smooth musclegut smooth muscle