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Characteristics of Chicken Intraembryonic Cells that Express B‐L (Ia‐Like) Antigen under the Influence of Cultured Bursal Epithelium
Author(s) -
EEROLA E.,
LASSILA O.,
GILMOUR D. G.,
TOIVANEN A.
Publication year - 1983
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1111/j.1365-3083.1983.tb00855.x
Subject(s) - incubation , biology , antigen , peripheral blood mononuclear cell , epithelium , microbiology and biotechnology , bursa of fabricius , in vitro , immunology , immune system , biochemistry , genetics
In‐vitro‐cultured bursal epithelium (BE) and BE‐conditioned medium (BECM) induce B‐L antigen on chicken intraembryonic cells. Cells prepared from 9‐day‐old intraembryonic mesoderm were fractionated in accordance with cell size by linear albumin gradient sedimentation at 1 g. Two cell types could be distinguished on which expression of the B‐L antigen was altered after a 6‐h incubation with the bursal epithelial component. One fraction contained small mononuclear cells with low sedimentation velocity (≤ 3 mm/h) and low spontaneous proliferation activity. These cells responded strongly to BECM and showed a slight but not significant response to BE (index after incubation with BECM 3.8, with BE 1.7, as compared with RPMI medium control). The other fraction was composed of large mononuclear cells with sedimentation velocity > 9 mm/h and with high spontaneous proliferation. These cells showed a response of equal magnitude to both BE and BECM (index after incubation with BE 2.0, with BECM 2.3). These results suggest that the bursa of Fabricius has influence on two different cell types: a large, probably primitive undifferentiated cell, responding equally to bursal cellular contacts and BE culture supernatant, and a small mononuclear cell type, probably more mature, responding more clearly to the bursal humoral factor.