Stem cell factor potentiates histamine secretion by multiple mechanisms, but does not affect tumour necrosis factor-alpha release from rat mast cells

Immunology
T J LinA D Befus

Abstract

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 b...Continue Reading

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