title: Role of intracellular calcium in histamine release from rat mast cells.
abstract: Compound 48/80-induced histamine release may utilize both intracellular and extracellular calcium. The release is inhibited by La3+ and TMB-8 both in the presence and absence of calcium. The observations are consistent with a mobilization of calcium from the inner surface of the plasma membrane supporting the release. TMB-8 probably acts at more than one site. It has been shown to inhibit skeletal muscle contraction and this has been correlated to its inhibitory effect on the release of Ca2+ from the sarcoplasmic reticulum. TMB-8 also inhibits resting cellular influx and efflux of calcium in the ileum. Anaphylactic and dextran-induced histamine release is dependent on extracellular calcium; the inhibition of the release by TMB-8 seems to be primarily due to an interference with calcium transport across the plasma membrane. In the absence of extracellular calcium the inhibition of compound 48/80-induced histamine release by TMB-8 seems to be due to stabilization of Ca2+ binding to cellular stores.
mesh_terms: D000818:Animals; D002118:Calcium / Q000502:physiology*; D003911:Dextrans / Q000494:pharmacology; D004492:Edetic Acid / Q000494:pharmacology; D005707:Gallic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D006636:Histamine Release / Q000187:drug effects; D066298:In Vitro Techniques; D007811:Lanthanum / Q000494:pharmacology; D008274:Magnesium / Q000494:pharmacology; D008297:Male; D008407:Mast Cells / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D003189:p-Methoxy-N-methylphenethylamine / Q000494:pharmacology
chemical_list: D003911:Dextrans; D003189:p-Methoxy-N-methylphenethylamine; C006014:8-(N,N-diethylamino)octyl-3,4,5-trimethoxybenzoate; D005707:Gallic Acid; D007811:Lanthanum; D004492:Edetic Acid; D008274:Magnesium; D002118:Calcium