Mouse B-1 cell-derived mononuclear phagocyte, a novel cellular component of acute non-specific inflammatory exudate
Data
2001-09-01
Autores
Almeida, Sandro Rogério de 
Frymuller, E.
Dias, Maria Ângela Amorim
Bogsan, Cristina Stewart Bittencourt
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At least three B cell subsets, B-1a, B-1b and B-2, or conventional B cells are present in the mouse periphery. Here we demonstrate that B-1 cells spontaneously proliferate in stationary cultures of normal adherent mouse peritoneal cells. B-1 cells were characterized by morphology, immunohistochemistry and flow cytometry. IgM was detected in the supernatants of these cultures. We demonstrated that the major cell population analyzed expresses the B-1b phenotype. When these cells were transferred to a new culture, a large proportion of them adhere to the plastic surface, and spread as bipolar cells endowed with the capacity to phagocytose via Fe and mannose receptors. Flow cytometry analysis of these adherent cells demonstrated that the great majority of them share both B-220 and Mac-1 antigens. Nevertheless, 45% of them were exclusively Mac-1(+). Finally, when they were labeled in vitro with [H-3]thymidine and transferred to the peritoneal cavity of naive mice, they migrate to a non-specific inflammatory focus induced by a foreign-body implant. These data demonstrate that B-1 cells, mainly B-1b cells, not only proliferate and differentiate into a mononuclear phagocyte in vitro, but also that they exit the peritoneal cavity and migrate to a non-specific inflammatory milieu.
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International Immunology. Oxford: Oxford Univ Press, v. 13, n. 9, p. 1193-1201, 2001.