Copeptin levels increase in response to both insulin-induced hypoglycemia and arginine but not to clonidine: data from GH-stimulation tests

Author:

Stankovic Jelena1ORCID,Kristensen Kurt23,Birkebæk Niels3,Jørgensen Jens Otto Lunde1ORCID,Søndergaard Esben12ORCID

Affiliation:

1. Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark

2. Steno Diabetes Center Aarhus (SDCA), Aarhus University Hospital, Aarhus, Denmark

3. Department of Pediatrics, Aarhus University Hospital, Aarhus, Denmark

Abstract

Background The diagnosis of the polyuria–polydipsia syndrome is challenging. Copeptin is a robust biomarker of arginine vasopressin (AVP) secretion. Arginine, which stimulates growth hormone (GH), has been shown also to stimulate copeptin secretion via unknown mechanisms. Aim The aim was to investigate copeptin levels in response to three different GH stimulation tests in patients suspected of GH deficiency. Methods In this cross-sectional study, we measured plasma copeptin levels at baseline and at 60, 105, and 150 min in patients undergoing a stimulation test for growth hormone deficiency with either arginine (n = 16), clonidine (n = 8) or the insulin tolerance test (ITT) (n = 10). Results In patients undergoing the arginine test, the mean age was 9 years, and 10 years for clonidine. The ITT was only performed in adult patients (>18 years) with a mean age of 49 years. Copeptin level increased significantly from baseline to 60 min after arginine (P <0.01) and ITT (P < 0.01). By contrast, copeptin level tended to decrease after clonidine stimulation (P = 0.14). Conclusion These data support that infusion of arginine increases plasma copeptin levels and reveal a comparable response after an ITT. We hypothesize that the underlying mechanism is abrogation of somatostatin-induced AVP suppression.

Publisher

Bioscientifica

Subject

Endocrinology,Endocrinology, Diabetes and Metabolism,Internal Medicine

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4. Development and clinical application of a new method for the radioimmunoassay of arginine vasopressin in human plasma;Robertson,1973

5. Vasopressin and copeptin in health and disease;Christ-Crain,2019

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