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The Journal of Immunology, Vol 148, Issue 3 868-871, Copyright © 1992 by American Association of Immunologists
ARTICLES |
HR Katz, MB Raizman, CS Gartner, HC Scott, AC Benson and KF Austen
Department of Medicine, Harvard Medical School, Boston, MA.
The releases of beta-hexosaminidase, LTC4, LTB4, and PGD2 after the bridging of Fc gamma R3 were assessed in mouse IL-3-dependent bone marrow-derived progenitor mast cells (BMMC), BMMC maintained in coculture with 3T3 fibroblasts separated by a filter to achieve maturation of the granules toward those of a serosal mast cell (SMC), and SMC that are the prototype of a mouse connective tissue mast cell. Bridging of Fc gamma R on BMMC with the 2.4G2 rat anti-Fc gamma RII/III mAb and anti-rat IgG elicited only 4% net release of beta- hexosaminidase and 4, 2, and 1 ng/10(6) cells of immunoreactive LTC4, LTB4, and PGD2, respectively. Bridging of Fc-IgE receptors (Fc epsilon R) on BMMC yielded 35% net release of beta-hexosaminidase and 9, 4, and 3 ng/10(6) cells of immunoreactive LTC4, LTB4, and PGD2, respectively. BMMC maintained in coculture responded to the bridging of Fc gamma R with statistically significant increases in the net percent release of beta-hexosaminidase to 16% and in the generation of immunoreactive LTC4 to 11 ng/10(6) cells, but without a significant change in the production of either LTB4 or PGD2. Bridging of Fc epsilon R on cocultured mast cells yielded a net percent release of beta- hexosaminidase and lipid mediator amounts and profile similar to those for BMMC. Bridging of Fc gamma R on purified mouse SMC resulted in a maximal net percent release of beta-hexosaminidase of 10% and the generation of 4, 1, and 17 ng/10(6) cells of immunoreactive LTC4, LTB4, and PGD2, respectively; the net percent release of beta-hexosaminidase and PGD2 generation were significantly greater than those obtained from BMMC. The Fc epsilon R-mediated net percent release of beta- hexosaminidase from purified SMC was 34%, with PGD2 being the predominant metabolite of arachidonic acid. That the predominant lipid mediator generated with activation by either Fc gamma R or Fc epsilon R is LTC4 for cocultured mast cells and PGD2 for SMC suggests that the mast cell phenotype rather than the receptor class being bridged determines the lipid mediator profile. The responsiveness to Fc gamma R bridging elicited by coculture of BMMC with fibroblasts in vitro and present in SMC derived in vivo relative to BMMC may relate to the previously measured increases in receptor number per cell, but may also involve the acquisition of an enhanced signal transduction capability, possibly through the increased expression of Fc gamma RIII.
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