title: The effects of nonidet P40 on the function of rat peritoneal mast cells in vitro.
abstract: 1 Treatment of purified rat peritoneal mast cells at 37 degrees C with concentrations of the non-ionic detergent nonidet P40 (NP40) up to 0.005% (v/v) failed to reduce their viability. 2 There was a marked reduction in the histamine releasing capacity of NP40-treated mast cells upon challenge with a variety of selective (adrenocorticotrophic hormone 1-24 (Synacthen), rabbit anti-rat IgE antiserum, adenosine triphosphate (ATP) and the calcium ionophore, A 23187) and non-selective (rabbit anti-rat mast cell antiserum plus complement) histamine liberators. 3 Nonidet P40 (0.005%) was found to reduce the activity of a mast cell membrane 'ecto-enzyme', calcium-activated ATPase, by about 45% when presented at the time of its assay.
mesh_terms: D000818:Animals; D001202:Ascitic Fluid / Q000166:cytology; D000252:Calcium-Transporting ATPases / Q000032:analysis; D003902:Detergents / Q000494:pharmacology*; D006636:Histamine Release / Q000187:drug effects; D066298:In Vitro Techniques; D008407:Mast Cells / Q000187:drug effects* / Q000378:metabolism; D017830:Octoxynol; D011092:Polyethylene Glycols; D051381:Rats; D013501:Surface-Active Agents / Q000494:pharmacology*
chemical_list: D003902:Detergents; D013501:Surface-Active Agents; D011092:Polyethylene Glycols; D017830:Octoxynol; C010615:Nonidet P-40; D000252:Calcium-Transporting ATPases