CORTICOTROPIN-RELEASING FACTOR-BINDING PROTEIN CONCENTRATIONS IN PLASMA OF PATIENTS WITH HYPOTHALAMIC-PITUITARY-ADRENAL DISORDERS

Immunoreactive corticotropin-releasing factor-binding protein (CRF-BP) concentrations in human plasma were determined by means of radioimmun oassay for human CRF-BP. CRF-BP antiserum to the C-terminal fragment o f human CRF-BP (298-322) was produced, and CRF-BP (298-322) was used a s the tracer and the standard. Large amounts of human CRF did not affe ct measurement of plasma CRF-BP with this radioimmunoassay. The basal plasma CRF-BP concentration in normal subjects was 4.19 +/- 0.57 nmol/ L (mean +/- SD). The CRF-BP concentration was low in patients with Cus hing's syndrome, except those with preclinical Cushing's syndrome, and high in patients with Addison's disease, hypopituitarism and isolated ACTH deficiency. After surgery, the plasma CRF-BP concentration in pa tients with Cushing's syndrome rose, peaked, and then decreased to the control level. In patients with Addison's disease, the high plasma CR F-BP concentration decreased to the control level after hydrocortisone replacement, the same as plasma ACTH concentration. These findings su ggest that the immunoreactive CRF-BP concentration in human plasma was decreased by glucocorticoids, at least under chronic conditions.