Mechanisms of strain-dependent development of mast cells from mouse splenocytes

Immunology and Cell Biology
Zhi-Qing HuTadakatsu Shimamura

Abstract

Mast cell development from spleen cells was not triggered by prostaglandin E1 (PGE1) or dibutyryl cAMP (db-cAMP) during a 12 day culture when the spleen cells were obtained from C57BL/6N and DBA/1 mice, but mast cells did develop when the spleen cells were obtained from C3H/HeN, BALB/c and ICR mice. A lack of endogenous IFN-gamma in the initial 2 days of the culture period was responsible for the failure. This was confirmed by adding neutralizing anti-IFN-gamma antibody and rIFN-gamma to the cultures and by determining IFN-gamma levels in the spleen cell cultures. Th1 cells in the spleens of C57Bl and DBA/1 mice were much more sensitive to PGE1 and db-cAMP than Th1 cells from other inbred mice strains, and consequently, IFN-gamma production was inhibited in spleen cell cultures of C57BL and DBA/1 mice on addition of PGE1 or db-cAMP. Furthermore, the different sensitivities of Th1 cells to PGE and db-cAMP were dependent on the different levels of IL-12 p40 monomers or homodimers in the spleen cell cultures. As the endogenous specific inhibitors of IL-12 p70 (heterodimers of p40 and p35), large amounts of IL-12 p40 monomers or homodimers in the spleen cell cultures of C57BL and DBA/1 mice enhanced the ability of PGE1 and db-cAMP ...Continue Reading

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