homeostasis/metabolism
• the increase in intracellular calcium following surface IgM crosslinking is more rapid in mutant B cells than in wild-type B cells
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immune system
• B cell development and maturation are delayed in young mutants
• impaired transition from pre-B to immature B cells and from immature to mature B cells
• adult mutants exhibit a slower rate of generating mature recirculating B cells
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• increase in numbers of immature IgM hi B220 lo B cells in the spleens of young mutants
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• increase in IgM-IgD- B cells in Peyer's patches and mesenteric lymph nodes
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• B-1 cell numbers are increased in the spleen and peritoneal cavity
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• modest increase of spleen marginal zone B cells
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• splenic (B220+) B cells are decreased by 24% compared to wild-type; numbers in lymph nodes and Peyer's patches are decreased by 32% and 20%, respectively
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• decrease in numbers of mature B cells in the bone marrow and periphery
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• mature B-2 cell numbers are reduced in the periphery
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• 38% reduction in IgM int CD23+ mature long-lived follicular B cells in the spleen
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• increase in the number of IgM-IgD- pre-B cells
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• increase in the number of activated B cells
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• splenic B cells show increased proliferative responses to low levels of IgM cross-linking and to stimulation with LPS
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• the increase in intracellular calcium following surface IgM crosslinking is more rapid in mutant B cells than in wild-type B cells
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• small, but significant, increase in the serum IgM level in nonimmunized mutants
• mutants show normal T-independent responses except for a slightly stronger IgM response to TNP-Ficoll, and normal type 2 T cell-independent responses
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hematopoietic system
• B cell development and maturation are delayed in young mutants
• impaired transition from pre-B to immature B cells and from immature to mature B cells
• adult mutants exhibit a slower rate of generating mature recirculating B cells
|
• increase in numbers of immature IgM hi B220 lo B cells in the spleens of young mutants
|
• increase in IgM-IgD- B cells in Peyer's patches and mesenteric lymph nodes
|
• B-1 cell numbers are increased in the spleen and peritoneal cavity
|
• modest increase of spleen marginal zone B cells
|
• splenic (B220+) B cells are decreased by 24% compared to wild-type; numbers in lymph nodes and Peyer's patches are decreased by 32% and 20%, respectively
|
• decrease in numbers of mature B cells in the bone marrow and periphery
|
• mature B-2 cell numbers are reduced in the periphery
|
• 38% reduction in IgM int CD23+ mature long-lived follicular B cells in the spleen
|
• increase in the number of IgM-IgD- pre-B cells
|
• increase in the number of activated B cells
|
• splenic B cells show increased proliferative responses to low levels of IgM cross-linking and to stimulation with LPS
|
• the increase in intracellular calcium following surface IgM crosslinking is more rapid in mutant B cells than in wild-type B cells
|
• small, but significant, increase in the serum IgM level in nonimmunized mutants
• mutants show normal T-independent responses except for a slightly stronger IgM response to TNP-Ficoll, and normal type 2 T cell-independent responses
|
cellular
• splenic B cells show increased proliferative responses to low levels of IgM cross-linking and to stimulation with LPS
|