Abstract
Cells of the immune system produce biologically active adrenocorticotropic hormone (ACTH). Many laboratories, however, have been unable to replicate experiments which demonstrate ACTH in immune cells. Sensitive immunohistochemical staining and digital scanning, confocal microscopy were used to study regulation of ACTH-like immunoreactivity (ACTH-IR) in human mononuclear cells. Cytoplasmic ACTH-IR was induced by corticotrophin releasing factor (CRF)/arginine vasopressin (AVP), and also by protein kinase C (PKC) activation and by the interferon (IFN-alpha beta inducer, Na-polyinosinic-polycytidylic acid (polyIC). Induction of cytoplasmic ACTH-IR was maximal within 6 hr of stimulation with CRF/AVP or phorbol myristate acetate (PMA). Recombinant human interleukin-1 beta (rhIL-1 beta) was also stimulatory, but rhIL-1 alpha had minimal effect. Regulation of ACTH-IR production in immune cells parallels the regulation of ACTH in the anterior pituitary, and ACTH-like material may affect immune responses.
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