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We have produced a transgenic mouse (PV1TgL) that can only generate B lymphocytes with an Ig receptor specific for the synthetic polymer polyvinyl pyrrolidinone. Before immunization, bone marrow B cell numbers are very low, and peripheral lymphoid organs are almost devoid of B cells, confirming the role of positive selection by Ag in the development of mature B cell populations. The predominant population of B cells in the spleens of naive adult PV1TgL mice have most of the characteristics of marginal zone B cells, including anatomical location in the peripheral areas of the splenic white pulp. After immunization, a new population of B cells appears in the spleen with the characteristics of B-1 cells. Similar cells also appear somewhat later in the peritoneal cavity. Our findings suggest that immunization with a thymus-independent Ag can lead to the appearance and expansion of Ag-reactive B-1 cells in an adult mouse.

Rapid Induction of Splenic and Peritoneal B-1a Cells in Adult Mice by Thymus-Independent Type-2 Antigen