title: Bovine Doppel (Dpl) and prion protein (PrP) expression on lymphoid tissue and circulating leukocytes.
abstract: Doppel (Dpl) protein shares some structural features with prion protein (PrP), whose pathologic isoform (PrPsc) is considered to be the causative agent of transmissible spongiform encephalopathies. Dpl is mainly expressed in testes but, when ectopically expressed in the central nervous system, is neurotoxic. We have examined the expression pattern of Dpl and PrP on bovine lymphoid tissues and circulating leukocytes. A polyclonal anti-Dpl antibody along with a panel of monoclonal antibodies specific for leukocyte membrane antigens or PrP were used to examine frozen sections from spleen, lymph nodes, and bone marrow by immunohistochemistry. Blood was analyzed by flow cytometry. Double staining was used to study the possible coexpression of the two proteins and to characterize cells expressing Dpl and/or PrP. Dpl was expressed in B-cells, in dendritic cells within lymphoid follicles, bone marrow, circulating myeloid cells, and circulating B-cells. The distribution of Dpl was quite similar to that of PrP. The only differences in expression observed concerned the low number of Dpl+ cells in lymph nodes and the strong Dpl positivity of circulating granulocytes. The two proteins were rarely co-expressed, suggesting an independent expression mechanism in resting cells. The role of Dpl+ leukocytes in the pathogenesis of Dpl- or PrP-induced diseases merits further investigation.
authors.affiliation: Department of Veterinary Pathology, Hygiene and Health, University of Milan, Milan, Italy. saverio.paltrinieri@unimi.it
authors.forename: Saverio
authors.initials: S
authors.lastname: Paltrinieri
authors.forename: Stefano
authors.initials: S
authors.lastname: Comazzi
authors.forename: Valentina
authors.initials: V
authors.lastname: Spagnolo
authors.forename: Marco
authors.initials: M
authors.lastname: Rondena
authors.forename: Wilma
authors.initials: W
authors.lastname: Ponti
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Ceciliani
mesh_terms: D000818:Animals; D001775:Blood Circulation; D001853:Bone Marrow / Q000378:metabolism; D002417:Cattle; D005260:Female; D005434:Flow Cytometry; D007150:Immunohistochemistry; D007962:Leukocytes / Q000378:metabolism*; D008198:Lymph Nodes / Q000378:metabolism; D008221:Lymphoid Tissue / Q000378:metabolism*; D008297:Male; D011328:Prions / Q000096:biosynthesis*; D013154:Spleen / Q000166:cytology / Q000378:metabolism
chemical_list: D011328:Prions