Abstract
Ca2+ mobilization in muscle cells from the circular muscle layer of the mammalian intestine is mediated by IP3-dependent Ca2+ release. Ca2+ mobilization in muscle from the adjacent longitudinal muscle layer involves a distinct, phosphoinositide-independent pathway. Receptors for contractile agonists in longitudinal muscle cells are coupled via a pertussis toxinsensitive G protein to activation of PLA2 and formation of arachidonic acid (AA). The latter activates Cl− channels resulting in depolarization of the plasma membrane and opening of voltage-sensitive Ca2+ channels. Ca2+ influx via these channels induces Ca2+ release by activating sarcoplasmic ryanodine receptor/Ca2+ channels. The increase in [Ca2+]i activates membrane-bound ADP ribosyl cyclase, and the resultant formation of cADPR enhances Ca2+-induced Ca2+ release.
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Abbreviations
- cADPR:
-
cyclic adenosine diphospho-ribose
- ADP ribosyl cyclase:
-
adenosine diphospho-ribosyl cyclase
- β-NAD+ :
-
β-nicotinamide adenine dinucleotide, reduced form
- IP3 :
-
inositol 1,4,5-trisphosphate
- PIP2 :
-
phosphatidylinositol 4,5-bis-phosphate
- PIP:
-
phosphatidylinositol 4-monophosphate
- PLA2 :
-
phospholipase A2
- AA:
-
arachidonic acid
- CCK-8:
-
cholecystokinin octapeptide
- GDPβS:
-
guanosine 5′-0-(β-thio) diphosphate
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Kuemmerle, J.F., Murthy, K.S. & Makhlouf, G.M. Longitudinal smooth muscle of the mammalian intestine. Cell Biochem Biophys 28, 31–44 (1998). https://doi.org/10.1007/BF02738308
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DOI: https://doi.org/10.1007/BF02738308