Stem cell factor potentiates histamine secretion by multiple mechanisms, but does not affect tumour necrosis factor-alpha release from rat mast cells.
The effect of stem cell factor (SCF) on histamine and tumour necrosis factor-alpha (TNF-alpha) release from rat peritoneal mast cells (PMC) was determined and the intracellular pathways involved in the potentiation of histamine secretion were investigated. The effects of SCF (2-100 ng/ml) were examined following both short-term (0 and 20 min) and long-term (up to 24hr) preincubations with SCF. Pretreatment of PMC with SCF for 0 min (concurrent) or 20 min did not induce histamine secretion directly, but significantly increased antigen (Ag)-induced histamine secretion. SCF potentiated Ag-induced intracellular Ca2+ increase and calcium ionophore A23187-induced histamine secretion. Pertussis toxin (PT) inhibited SCF-induced potentiation of IgE-dependent histamine secretion, indicating that PT-sensitive G-proteins are involved in the immediate effects of SCF. In long-term incubation experiments, SCF pretreatment for 18-24 hr significantly enhanced Ag-induced histamine secretion, but did not affect Ag-induced intracellular Ca2+ levels. The effects of long-term incubation with SCF, but not the short-term effects, were blocked by cycloheximide. Interestingly, spontaneous and Ag-induced TNF-alpha release from rat PMC were not affected by pretreatment with SCF (2-500 ng/ml) for 1 to 24 hr. Thus, through immediate and delayed mechanisms, SCF potentiates histamine release from PMC, but has not effect on TNF-alpha release. The regulation of MC by SCF may be important in allergic and other inflammatory diseases.
Lin
T J
TJ
Department of Medicine, University of Alberta, Edmonton, Canada.
Bissonnette
E Y
EY
Hirsh
A
A
Befus
A D
AD
D000818:Animals; D000947:Antigens, Helminth / Q000494:pharmacology; D001202:Ascitic Fluid / Q000276:immunology; D000001:Calcimycin / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism; D002478:Cells, Cultured; D006636:Histamine Release; D008297:Male; D008407:Mast Cells / Q000187:drug effects / Q000378:metabolism*; D009559:Nippostrongylus / Q000276:immunology; D051381:Rats; D017207:Rats, Sprague-Dawley; D019089:Stem Cell Factor / Q000494:pharmacology*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism*
D000947:Antigens, Helminth; D019089:Stem Cell Factor; D014409:Tumor Necrosis Factor-alpha; D000001:Calcimycin; D002118:Calcium