immune system
• thymic T cell subsets are normal with the exception of high expression of the CD45 isoforms RA and RC that are not expressed on wild-type thymoctes
• nave CD44lo T cells fail to accumulate in the periphery as the mice age
• CD44hi memory T cells compensate for peripheral T cell lymphopenia by homeostatic proliferation leading to an increase in the percentage of memory CD4 T cells
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• the overall CD4+ T cell number is reduced in these mice
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• the percentage of peripheral T cells expressing the memory marker CD44hi is increased about 4-fold in the periphery of mice over 12 weeks of age
• this increase in CD44hi memory T cells is secondary to a loss of nave CD44lo T cells
• the RA and RB isoforms of CD45, normally not expressed on memory T cells, are very highly expressed on the CD4+ memory T cells
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• memory T cells are defective in generating transcripts with alternative splices or promoters from numerous genes including the Ptprc gene (CD45)
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hematopoietic system
• thymic T cell subsets are normal with the exception of high expression of the CD45 isoforms RA and RC that are not expressed on wild-type thymoctes
• nave CD44lo T cells fail to accumulate in the periphery as the mice age
• CD44hi memory T cells compensate for peripheral T cell lymphopenia by homeostatic proliferation leading to an increase in the percentage of memory CD4 T cells
|
• the overall CD4+ T cell number is reduced in these mice
|
• the percentage of peripheral T cells expressing the memory marker CD44hi is increased about 4-fold in the periphery of mice over 12 weeks of age
• this increase in CD44hi memory T cells is secondary to a loss of nave CD44lo T cells
• the RA and RB isoforms of CD45, normally not expressed on memory T cells, are very highly expressed on the CD4+ memory T cells
|
• memory T cells are defective in generating transcripts with alternative splices or promoters from numerous genes including the Ptprc gene (CD45)
|