Detection of receptors for murine B cell stimulatory factor 1 (BSF1): presence of functional receptors on CBA/N splenic B cells
- PMID: 3496389
Detection of receptors for murine B cell stimulatory factor 1 (BSF1): presence of functional receptors on CBA/N splenic B cells
Abstract
The presence of receptors specific for murine B cell stimulatory factor 1 (BSF1) was demonstrated by utilizing an internally radiolabeled recombinant BSF1. Radiolabeled BSF1 was efficiently produced in Xenopus laevis oocytes injected with a cloned mRNA for BSF1 and 35S-methionine. The labeled BSF1 specifically bound to splenic B cells. A Scatchard analysis indicated the existence of one class of receptor sites. BSF1 receptors were found to be distributed on a wide range of hematopoietic lineage cells, including B cells, T cells, macrophages, and mast cells. B cells from CBA/N mice with the xid gene defect had a similar level of BSF1 binding capacity compared with BALB/c strain B cells, and responded well to insoluble anti-Ig and BSF1 in proliferation assays, indicating that CBA/N B cells express functional BSF1 receptors at normal levels. Pre-B cell lines showed low levels of BSF1 binding, suggesting that cells in the B cell lineage acquire BSF1 responsiveness early in development.
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