T-cell suppression is enhanced by intact RBCs but this effect is unrelated solely to alloantigens. Neither apoptosis nor necrosis of T cells contributes to this phenomenon. IL-2 synthesis is suppressed after RBC exposure as a consequence of T-cell inhibition, but is not the primary cause of suppression. Fresh RBCs do not mediate T-cell suppression, indicating that changes in the RBC and development of the storage lesion may occur during initial blood bank processing.
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Long et al. (2013) studied this question.
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