Involvement of I-A-restricted B-B cell interaction in the polyclonal B cell differentiation induced by lipopolysaccharide
- Osaka Univ. Medical School (Japan)
The present study has examined a functional role of Ia molecules expressed on murine B cells in polyclonal B cell differentiation induced by lipopolysaccharide (LPS). Reverse, IgM PFC responses of unprimed B cells induced by LPS in the apparent absence of T cells and adherent accessory cells were markedly inhibited in a haplotype-specific manner by Fab monomer fragment of anti-class II (Ia) but not anti-class I MHC monoclonal antibody (mAb). However, the degree of inhibition of LPS responses of H-2-heterozygous F1 B cells expressing both parental I-A products by either one of anti-I-A mAb was at best half that of the parental B cells. Interestingly, when (B10 x B10.-BR)F1 (H-2b/k) B cells were fractionated into adherent and nonadherent populations by their ability to bind to parental B10 B cell monolayers, LPS responses of F1 B cells adherent to and nonadherent to the B10 B cell monolayers were selectively inhibited by anti-I-Ab and anti-I-Ak mAb, respectively. These results suggest that LPS-responsive F1 B cells comprise at least two separate populations with restriction specificity for only one of the parental I-A products expressed on B cells. In addition, it was demonstrated that the I-A-restriction specificity of LPS-responsive B cells is plastic and determined by H-2-genotype of bone marrow cells present during B cell ontogeny but not by that of radiation-resistant host elements. Namely, the LPS responses of B10-derived B cells from (B10 + B10.BR) (H-2b x H - 2k)F1 radiation bone marrow chimeras but not from B10 (H-2b x H-2k)F1 chimeras became sensitive to the inhibition of anti-I-Ak mAb in the presence of mitomycin C-treated I-Ak-positive B cells, supporting a notion of receptor-Ia molecules interactions rather than like-like interactions.
- OSTI ID:
- 6867438
- Journal Information:
- Advances in Experimental Medicine and Biology; (USA), Vol. 256; ISSN 0065-2598
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BONE MARROW CELLS
TRANSPLANTS
LIPOPOLYSACCHARIDES
BIOCHEMICAL REACTION KINETICS
LYMPHOCYTES
CELL DIFFERENTIATION
ANTIGENS
GENOTYPE
MICE
MONOCLONAL ANTIBODIES
RADIATION CHIMERAS
ANIMAL CELLS
ANIMALS
ANTIBODIES
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY FLUIDS
CARBOHYDRATES
CHIMERAS
CONNECTIVE TISSUE CELLS
KINETICS
LEUKOCYTES
LIPIDS
MAMMALS
MATERIALS
MOSAICISM
ORGANIC COMPOUNDS
POLYSACCHARIDES
REACTION KINETICS
RODENTS
SACCHARIDES
SOMATIC CELLS
VERTEBRATES
560152* - Radiation Effects on Animals- Animals