The Journal of Immunology, Vol 150, Issue 2 617-624, Copyright © 1993 by American Association of Immunologists

ARTICLES

Mouse 3T3 fibroblasts induce rat basophilic leukemia (RBL-2H3) cells to acquire responsiveness to compound 48/80

M Swieter, RJ Midura, H Nishikata, C Oliver, EH Berenstein, SE Mergenhagen, VC Hascall and RP Siraganian
Laboratory of Immunology, National Institute of Dental Research, National Institutes of Health, Bethesda, MD 20892.

2H3 subline of rat basophilic leukemia (RBL-2H3) cells are mast cell analogs that lack responsiveness to nonimmunologic stimuli such as compound 48/80 and substance P. To determine if fibroblasts can influence this responsiveness, RBL-2H3 cells were cocultured with confluent monolayers of mouse 3T3 fibroblasts and assayed for secretagogue-induced histamine release. After 1 wk in coculture, RBL- 2H3 cells began to respond to compound 48/80. Responsiveness reached a maximum at 2 wk in coculture and remained at this level for an additional 2 wk. Histamine release was specific, noncytotoxic, dose- dependent, and occurred even in the absence of extracellular Ca2+. No soluble factor from 3T3 cells was found that induced these alterations. Moreover, neither recombinant rat or mouse steel factor, at concentrations up to 250 ng/ml, was able to alter RBL-2H3 cell reactivity to compound 48/80. By 2 wk in coculture, RBL-2H3 cells also became responsive to substance P, although no changes in histamine content, Alcian blue+/safranin- staining or type of serine protease were detected. These results show that 3T3 fibroblasts cause an alteration in the functional repertoire of RBL-2H3 cells and that soluble steel factor cannot duplicate the effect.

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