The Neuroendocrine Effects of Interleukin-2 Treatment

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Abstract
Observations of neuropsychiatric changes in patients receiving interleukin-2 (IL-2) led us to examine the effects of IL-2 administration on the stress-related hormones, β-endorphin, ACTH, cortisol, and CRH. We evaluated 30 cancer patients who received immunotherapy with IL-2 or IL-2 plus lymphokine-activated killer (LAK) cells. Blood samples were taken immediately before and 4 and 8 h after infusion of IL-2 or IL-2 plus LAK cells. IL-2 stimulated increased hormone levels 4 h after infusion compared with those before therapy and with basal levels in normal volunteers at the following magnitudes: β-endorphin, 10-fold; ACTH, 20-fold; and cortisol, 2-fold. The effect of IL-2 was not altered in patients also receiving LAK cells. An effect of treatment course was noted, with higher stimulated values seen 4 h after IL-2 in the second treatment course compared with those after the first course [change (Δ) in β-endorphin, 101 vs. 11 fmol/L; Δ ACTH, 138 vs. 8 pmol/L; Δ cortisol, 414 vs. 218 nmol/L]. We conclude that IL-2 treatment induces the release of neuroendocrine hormones and that a significant increase in hormonal stimulation occurs upon reexposure to IL-2.