Ontogeny and tissue distribution of the chicken Bu-1a antigen - PubMed (original) (raw)
Ontogeny and tissue distribution of the chicken Bu-1a antigen
E Houssaint et al. Immunology. 1987 Nov.
Abstract
By using a sensitive technique of immunofluorescence on polyethylene glycol-embedded tissue sections, we could better determine the distribution of L22+ cells in embryonic and adult chickens. L22 mAb was originally described as reacting with bursa and bursa-derived lymphocytes. We now present evidence to suggest that this mAb also reacts with a subset of macrophages found in bursa, thymus, spleen, liver, intestine and peritoneum. The L22+ cells appear early during embryonic life, simultaneously in yolk sac, bursa, thymus, spleen and bone marrow. At all steps of their ontogeny, thymocytes were L22-, while most, if not all, bursal lymphoid cells were L22+. Moreover, L22 antigen can be detected on haemopoietic cells probably precursors, before and during their entry into the bursal rudiment on Day 9 or 10 of embryonic life. We conclude from these data that L22 is not restricted to the B-cell lineage as it is shared with a subset of macrophages. Furthermore, our observations of L22+ cells during embryonic life favour the hypothesis of separate lineages for B-cell and T-cell precursors in chick embryo, which was previously put forward on the basis of different sets of experiments.
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