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Phenotypical and biochemical characterization of a variant CD45R expression pattern in human leukocytes

As a result of a regulatory polymorphism a variant pattern of CD45R expression can be found in 8% of healthy individuals. We have previously reported that all resting T cells of these individuals react with CD45RA monoclonal antibodies (mAb) that are directed to the high‐molecular mass isoforms (220 and 205 kDa) of the leukocyte common antigen (CD45). In addition, their T cells remain CD45RA+ after in vitro activation. In this report we studied the regulatory CD45R polymorphism in more detail. Flow cytometry studies revealed that CD45RA antigens are weakly expressed on normal monocytes but are absent from granulocytes. In individuals displaying the variant CD45R pattern both monocytes and granulocytes were CD45RA+. In controls and variant T cells CD45RA mAb precipitated two chains with molecular masses of about 220 and 205 kDa. In activated T cells from controls (CD45RA−) neither p220 nor the p205 chain of CD45RA could be detected. However, activated T cells from variant individuals (CD45RA+) did not express p220 but expressed p205 of CD45RA. These data indicate that there is a failure to down‐regulate p205 CD45RA in individuals displaying the variant CD45R expression pattern. Since their T cells lost p220 CD45RA during activation the data also suggest that the two isoforms detected by CD45RA mAb can be regulated independently.