Large intestine smooth muscle cell

Large intestine smooth muscle cells are specialized contractile cells forming the muscular layers (muscularis propria and muscularis mucosae) of the colon. They are responsible for the involuntary, rhythmic contractions that propel feces and mix luminal content (peristalsis, segmentation). These cells are electrically and functionally coupled with interstitial cells of Cajal and mesenchymal stromal cells, forming an integrated syncytium that coordinates motility. Large intestine smooth muscle cells respond to neurotransmitters (e.g., acetylcholine, nitric oxide), hormones, and mechanical stretch. Dysregulation of their function leads to motility disorders, and they participate in pathologic processes such as fibrosis and inflammation. While not a classical molecular drug target (e.g., receptor or enzyme), drugs affecting bowel motility act directly or indirectly on these cells; however, this entry represents a cell type rather than a single pharmacological entity, so it is not a precise drug target[1][4][5][6][8].\n\nNote: "Large intestine smooth muscle cell" is a tissue or cell type, not a single molecular target such as a receptor, enzyme, or transporter. Therefore, it is not considered an individual "therapeutic target" in standard pharmacological terms, and this entry would typically be considered *incorrect* for a drug discovery target database. For drug discovery purposes, one should instead specify individual molecular entities (e.g., muscarinic acetylcholine receptor M3, serotonin 5-HT4 receptor) present in these cells.

Other names

Colonic smooth muscle cellGastrointestinal smooth muscle cell (in large intestine)Intestinal smooth muscle cell

Modulation of acetylcholine or muscarinic signaling (antispasmodics inhibit contraction); Agonism/antagonism of serotonin (5-HT4) receptors (prokinetics stimulate contraction); Inhibition of calcium influx (calcium channel blockers reduce contraction); Opioid receptor agonism inhibits neurotransmitter release, decreasing motility