Oxytocin levels in response to pituitary provocation tests in healthy volunteers
Objective: Oxytocin, secreted into circulation through the posterior pituitary, regulates lactation, weight, and socio-behavioral functioning. Oxytocin deficiency has been suggested in patients with hypopituitarism, however, diagnostic testing for oxytocin deficiency has not been developed. The aim of this study was to investigate known pituitary provocation tests to stimulate plasma oxytocin. Design: 65 healthy volunteers underwent either the hypertonic saline or arginine infusion test, known to stimulate copeptin, or the oral macimorelin test, known to stimulate growth hormone. Plasma oxytocin was measured before and once plasma sodium ≥150mmol/l for the hypertonic saline, after 60 minutes for the arginine infusion and after 45 minutes for the oral macimorelin test (expected peak of copeptin and growth hormone levels, respectively). Primary outcome was change from basal to stimulated oxytocin levels using paired t-tests. Results: As expected, copeptin increased in response to hypertonic saline and arginine infusion (p<0.001), and growth hormone increased to oral macimorelin (p<0.001). Oxytocin increased in response to hypertonic saline infusion from 0.4pg/mL (0.2) to 0.6pg/mL (0.3) (p=0.003) but with a high variance. There was no change to arginine infusion (p=0.4), and a trend to lower stimulated levels to oral macimorelin (p=0.05). Conclusion: Neither the arginine infusion nor the oral macimorelin test stimulate plasma oxytocin levels, whereas there was an increase with high variance upon hypertonic saline infusion. As a predictable rise in most participants is required for a reliable pituitary provocation test, none of the investigated pituitary provocation tests can be recommended diagnostically to identify patients with an oxytocin deficiency.