B-1-Like cells exist in sheep. Characterization of their phenotype and behaviour
1998
Chevalier, Nathalie | Berthelemy, Madeleine | Laine-Prade, Veronique | Le Rhun, Danielle | Polack, Bruno | Féménia, Françoise | Naessens, J | Levy, Daniel | Schwartz-Cornil, Isabelle | École nationale vétérinaire d'Alfort (ENVA) | Immunologie cellulaire et moléculaire ; Institut National de la Santé et de la Recherche Médicale (INSERM) | Unité mixte de recherche biologie moléculaire et immunologie parasitaires et fongiques ; Agence Française de Sécurité Sanitaire des Aliments (AFSSA)-École nationale vétérinaire d'Alfort (ENVA)-Institut National de la Recherche Agronomique (INRA)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12) | Unité de recherche Virologie et Immunologie Moléculaires (VIM (UR 0892)) ; Institut National de la Recherche Agronomique (INRA)
International audience
اظهر المزيد [+] اقل [-]إنجليزي. Two populations of B lymphocytes, B-1 (CD5+ and/or CD11b+) and B-2 (CD5- and CD11b-) cells have been described. In mice, which is the species of reference for B-1 and B-2 cell studies, these two subsets present different developmental schemes, phenotypes, antibody repertoires, localization and behaviours. Interestingly, in sheep, B cells rearrange their immunoglobulin (Ig) loci around the neonatal period, similarly to murine B-1 cells. However, the phenotype of the sheep B cells has not been characterized with regards to their developmental pathway. In this report, we show that two sheep B-cell subsets can be distinguished on the basis of CD11b expression. Relative to CD11b- B cells, the CD11b+ B cells frequently co-express CD5, CD11c, higher levels of surface IgM (sIgM), show larger cell size and higher cell-cycling activity, and thus present a B-1-like phenotype. However, unlike murine B-1 cells, sheep B-1 like cells mainly localize in blood, display a higher propensity to spontaneous apoptosis relative to B-2-like cells, and proliferate after sIgM stimulation. Our data show that despite neonatal immunoglobulin loci rearrangements, sheep B cells do not all express a B-1-like phenotype. However, B-1-and B-2-like cells co-exist and present phenotypic and behavioural specificities. Nevertheless, sheep B-1-and B-2-like cells differ from the murine B-1 and B-2 cells in their cell behaviour. These subsets can thus not be considered as true homologues among species
اظهر المزيد [+] اقل [-]المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique