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      Endotoxin- and Corticotropin Releasing Hormone-Induced Release of ACTH and Cortisol

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          The present study compares the effects of endotoxin, a key factor in gram-negative bacterial infection, and of corticotropin-releasing hormone (CRH) on ACTH and cortisol secretion in healthy male volunteers in a placebo-controlled design. Endotoxin (isolated from Salmonella abortus equi; 0.4 ng/kg body weight) induced a significantly delayed and prolonged increase of ACTH and cortisol secretion as compared to CRH (100 µg), supporting the hypothesis that different intermediate mechanisms are involved ( baseline/peak: ACTH<sub>Endotoxin</sub> vs. ACTHCRH: 140 ± 40 min vs. 44 ± 17 min (p < 0.001); Cortisol<sub>Endotoxin</sub> vs. Cortisol<sub>CRH</sub>: 113 ± 51 min vs. 66 ± 31 min (p < 0.05); peak/baseline: ACTH<sub>Endotoxin</sub> vs. ACTH<sub>CRH</sub>: 244 ± 79 min vs. 200 ± 25 min (p < 0.05); Cortisol<sub>Endotoxin</sub> vs. Cortisol<sub>CRH</sub> 278 ± 76 min vs. 182 ± 16 min (p < 0.001)). Activation of the hypothalamo-pituitary-adrenocortical (HPA) system by endotoxin in men is associated with increased interleukin-6 (peak value: 124 ± 109 pg/ml) and tumor necrosis factor-α (peak value: 69 ± 53 pg/ml) plasma levels which, probably together with locally produced interleukin-1, stimulate the HP A system both at the hypothalamic and (to a lesser degree) at the pituitary site. Provided that strictly controlled laboratory conditions are applied, the endotoxin challenge test presented here may serve as an appropriate and safe tool to explore an individual’s capacity for neuroendocrine adaptation to a bacterial stressor, thus providing information complementary to the CRH test.

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          Author and article information

          S. Karger AG
          08 April 2008
          : 58
          : 1
          : 123-128
          aMax Planck Institute of Psychiatry, Clinical Institute, Department of Psychiatry, Munich; bMax Planck Institute of Immunobiology, Freiburg, FRG
          126526 Neuroendocrinology 1993;58:123–128
          © 1993 S. Karger AG, Basel

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          Pages: 6
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