title: Absence of B stem cells in spleens of chickens fed the androgen analog mibolerone.
abstract: Bursa-derived stem cells in the spleens of chickens treated with the androgen analog mibolerone or with cyclophosphamide and in the spleens of untreated controls were examined by a transplantation technique. Spleen cells from syngeneic donors 2-20 weeks old were transferred to syngeneic cyclophosphamide-treated recipients, and the immunocompetence of the recipients was tested 5 weeks after the transfer by antigenic stimuli with sheep erythrocytes and Brucella abortus. Spleens of mibolerone-treated chickens failed to reconstitute the immunologic capability of cyclophosphamide-treated recipients in a manner similar to spleen cells from normal donors. Spleens of cyclophosphamide-treated donors did not contain stem cells. Stem cells were detected in the spleens of untreated controls as young as 2 weeks old; activity was highest after the 13th week of age.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000187:drug effects* / Q000276:immunology; D002645:Chickens / Q000276:immunology*; D003520:Cyclophosphamide / Q000494:pharmacology; D009277:Nandrolone / Q000031:analogs & derivatives* / Q000494:pharmacology; D013154:Spleen / Q000187:drug effects* / Q000276:immunology; D045165:Testosterone Congeners / Q000494:pharmacology*
chemical_list: D045165:Testosterone Congeners; D009277:Nandrolone; D003520:Cyclophosphamide