C-reactive protein is produced by a small number of normal human peripheral blood lymphocytes

doi:10.1084/jem.164.1.321

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C-reactive protein is produced by a small number of normal human peripheral blood lymphocytes

AE Kuta and LL Baum

Biosynthetic labeling with [35S]met and immunoprecipitation with anti-C- reactive protein (CRP) antibodies and Staphylococcus aureus indicate that cell surface CRP is produced by lymphocytes. The ability of anti- CRP to reduce NK activity, and the demonstration that 125I-anti-CRP- labeled PBL are found in low-density Percoll fractions associated with large granular lymphocyte (LGL) and NK activity suggest that S-CRP- bearing cells are NK effectors. The production of S-CRP by LGL supports this hypothesis. While lymphocytes were shown to synthesize S-CRP, monocytes produced no detectable S-CRP. The lymphocytes that produce S- CRP apparently do not secrete it; when lymphocyte culture supernatants were tested, no S-CRP was found. This is the first description of extrahepatic synthesis of CRP.
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