title: Potentiation of antigen-induced histamine release from rat peritoneal mast cells through a direct interaction between mast cells and non-mast cells.
abstract: Rat peritoneal mast cells, which had been sensitized two days earlier by an intraperitoneal injection of rat monoclonal IgE antibodies, were purified by density gradient centrifugation with 60% Percoll (cell purity > 95%). Histamine release from the purified mast cells (PMC) was then compared to that of a non-purified preparation (peritoneal exudate cells; PEC). Both PEC and PMC released similar amounts of histamine upon stimulation with calcium ionophore A23187 and compound 48/80. In contrast, antigen-induced histamine release from PMC was very low compared to that of PEC. PEC released up to 30% of total histamine upon challenge with 1 microgram/ml of antigen, whereas histamine release from PMC was only one third or less than that of PEC. When PEC was suspended in 60% Percoll and treated for a period needed for purification, the reduction of antigen-induced histamine release was negligible. Mast cells purified by centrifugation on a metrizamide gradient released only small amount of histamine similar to Percoll-purified mast cells. Non-mast cells (NMC) recovered from the interface of the 60% Percoll potentiated the antigen-induced histamine release from PMC concentration- and time-dependently. The supernatant of the NMC suspension which was incubated at 37 degrees C for 60 min, however, failed to potentiate histamine release in PMC. We concluded therefore that separation media such as Percoll and metrizamide do not cause the low antigen-induced histamine release in PMC, but that the separation of mast cells from other cells present in the peritoneal cavity itself causes it. Antigen-induced mast cell histamine release is potentiated through a direct interaction between mast cells and NMC, and some cell surface molecules also seem to be involved.
authors.affiliation: Department of Pharmacology, Gifu Pharmaceutical University, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Inagaki
authors.forename: H
authors.initials: H
authors.lastname: Kawasaki
authors.forename: M
authors.initials: M
authors.lastname: Ueno
authors.forename: H
authors.initials: H
authors.lastname: Nagai
authors.forename: A
authors.initials: A
authors.lastname: Koda
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D000001:Calcimycin / Q000494:pharmacology*; D002450:Cell Communication; D002469:Cell Separation; D002478:Cells, Cultured; D002499:Centrifugation, Density Gradient; D004140:Dinitrophenols / Q000494:pharmacology*; D006636:Histamine Release / Q000187:drug effects / Q000502:physiology*; D007073:Immunoglobulin E / Q000494:pharmacology; D008297:Male; D008407:Mast Cells / Q000187:drug effects / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D012710:Serum Albumin, Bovine / Q000494:pharmacology*; D003189:p-Methoxy-N-methylphenethylamine / Q000494:pharmacology*
chemical_list: D000911:Antibodies, Monoclonal; D004140:Dinitrophenols; C034638:dinitrophenyl-bovine serum albumin; D012710:Serum Albumin, Bovine; D007073:Immunoglobulin E; D000001:Calcimycin; D003189:p-Methoxy-N-methylphenethylamine