RELATIONSHIP BETWEEN CORTICOTROPIN-RELEASING FACTOR AND INTERLEUKIN-2- EVOLUTIONARY EVIDENCE

The addition of corticotropin-releasing factor (CRF) to molluscan hemo cytes induces the release of biogenic amines (norepinephrine, epinephr ine, dopamine), a phenomenon we have considered as an ancestral type o f stress response [(1992) Gen. Comp. Endocrinol. 87, 354-360]. A simil ar but less significant response was observed following the addition o f interleukin-2 (IL-2). Pre-incubation of hemocytes with IL-2 or anti- IL-2 monoclonal antibody significantly reduced or completely eliminate d the CRF-induced release of biogenic amines. Further direct evidence of competition between CRF and IL-2 was revealed by immunocytochemical and cytofluorimetric analysis. The data are compatible with the prese nce of a unique (ancestral?) receptor on molluscan hemocytes, capable of binding both CRF and IL-2, two key molecules of the neuroendocrine and immune system, respectively.