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Marko Stojanovic Neuroendocrinology Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, Clinical Centre of Serbia, Belgrade, Serbia
University of Belgrade, Medical Faculty, Belgrade, Serbia

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Zida Wu Department of Medicine for Endocrinology, Diabetes and Nutritional Medicine, Charité Universitätsmedizin, Campus Mitte, Berlin, Germany

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Craig E Stiles Centre for Endocrinology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK

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Dragana Miljic Neuroendocrinology Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, Clinical Centre of Serbia, Belgrade, Serbia
University of Belgrade, Medical Faculty, Belgrade, Serbia

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Ivan Soldatovic University of Belgrade, Medical Faculty, Belgrade, Serbia
Insitute of Medical Statistics and Informatics, Belgrade, Serbia

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Sandra Pekic Neuroendocrinology Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, Clinical Centre of Serbia, Belgrade, Serbia
University of Belgrade, Medical Faculty, Belgrade, Serbia

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Mirjana Doknic Neuroendocrinology Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, Clinical Centre of Serbia, Belgrade, Serbia
University of Belgrade, Medical Faculty, Belgrade, Serbia

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Milan Petakov Neuroendocrinology Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, Clinical Centre of Serbia, Belgrade, Serbia
University of Belgrade, Medical Faculty, Belgrade, Serbia

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Vera Popovic University of Belgrade, Medical Faculty, Belgrade, Serbia

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Christian Strasburger Department of Medicine for Endocrinology, Diabetes and Nutritional Medicine, Charité Universitätsmedizin, Campus Mitte, Berlin, Germany

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Márta Korbonits Centre for Endocrinology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK

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Background

Aryl hydrocarbon receptor-interacting protein (AIP) is evolutionarily conserved and expressed widely throughout the organism. Loss-of-function AIP mutations predispose to young-onset pituitary adenomas. AIP co-localizes with growth hormone in normal and tumorous somatotroph secretory vesicles. AIP protein is detectable in circulation. We aimed to investigate possible AIP and GH co-secretion, by studying serum AIP and GH levels at baseline and after GH stimulation or suppression, in GH deficiency (GHD) and in acromegaly patients.

Subjects and methods

Insulin tolerance test (ITT) was performed in GHD patients (n = 13) and age-BMI-matched normal GH axis control patients (n = 31). Oral glucose tolerance test (OGTT) was performed in active acromegaly patients (n = 26) and age-BMI-matched normal GH axis control patients (n = 18). In-house immunometric assay was developed for measuring circulating AIP.

Results

Serum AIP levels were in the 0.1 ng/mL range independently of gender, age or BMI. Baseline AIP did not differ between GHD and non-GHD or between acromegaly and patients with no acromegaly. There was no change in peak, trough or area under the curve during OGTT or ITT. Serum AIP did not correlate with GH during ITT or OGTT.

Conclusions

Human circulating serum AIP in vivo was assessed by a novel immunometric assay. AIP levels were independent of age, sex or BMI and unaffected by hypoglycaemia or hyperglycaemia. Despite co-localization in secretory vesicles, AIP and GH did not correlate at baseline or during GH stimulation or suppression tests. A platform of reliable serum AIP measurement is established for further research of its circulatory source, role and impact.

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Mirjana Doknic Neuroendocrine Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, University Clinical Center of Serbia, Belgrade, Serbia
Faculty of Medicine, University of Belgrade, Belgrade, Serbia

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Marko Stojanovic Neuroendocrine Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, University Clinical Center of Serbia, Belgrade, Serbia
Faculty of Medicine, University of Belgrade, Belgrade, Serbia

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Ivan Soldatovic Faculty of Medicine, University of Belgrade, Belgrade, Serbia
Institute of Medical Statistics and Informatics, Belgrade, Serbia

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Tatjana Milenkovic Mother and Child Health Care Institute of Serbia ‘Dr Vukan Cupic’, Belgrade, Serbia

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Vera Zdravkovic Faculty of Medicine, University of Belgrade, Belgrade, Serbia
University Children’s Clinic, Belgrade, Serbia

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Maja Jesic Faculty of Medicine, University of Belgrade, Belgrade, Serbia
University Children’s Clinic, Belgrade, Serbia

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Sladjana Todorovic Mother and Child Health Care Institute of Serbia ‘Dr Vukan Cupic’, Belgrade, Serbia

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Katarina Mitrovic Faculty of Medicine, University of Belgrade, Belgrade, Serbia
Mother and Child Health Care Institute of Serbia ‘Dr Vukan Cupic’, Belgrade, Serbia

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Rade Vukovic Faculty of Medicine, University of Belgrade, Belgrade, Serbia
Mother and Child Health Care Institute of Serbia ‘Dr Vukan Cupic’, Belgrade, Serbia

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Dragana Miljic Neuroendocrine Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, University Clinical Center of Serbia, Belgrade, Serbia
Faculty of Medicine, University of Belgrade, Belgrade, Serbia

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Dragan Savic Clinic for Neurosurgery, University Clinical Center of Serbia, Belgrade, Serbia

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Mihajlo Milicevic Clinic for Neurosurgery, University Clinical Center of Serbia, Belgrade, Serbia

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Aleksandar Stanimirovic Clinic for Neurosurgery, University Clinical Center of Serbia, Belgrade, Serbia

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Vojislav Bogosavljevic Faculty of Medicine, University of Belgrade, Belgrade, Serbia
Clinic for Neurosurgery, University Clinical Center of Serbia, Belgrade, Serbia

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Sandra Pekic Neuroendocrine Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, University Clinical Center of Serbia, Belgrade, Serbia
Faculty of Medicine, University of Belgrade, Belgrade, Serbia

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Emilija Manojlovic-Gacic Faculty of Medicine, University of Belgrade, Belgrade, Serbia
Institute of Pathology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia

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Aleksandar Djukic Department of Pathophysiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia

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Danica Grujicic Faculty of Medicine, University of Belgrade, Belgrade, Serbia
Clinic for Neurosurgery, University Clinical Center of Serbia, Belgrade, Serbia

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Milan Petakov Neuroendocrine Department, Clinic for Endocrinology, Diabetes and Metabolic Diseases, University Clinical Center of Serbia, Belgrade, Serbia
Faculty of Medicine, University of Belgrade, Belgrade, Serbia

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Objective

To analyze metabolic parameters, body composition (BC), and bone mineral density (BMD) in childhood-onset GH deficiency (COGHD) patients during the transition period (TP).

Design

Single- center, retrospective study was performed on 170 consecutive COGHD patients (age 19.2 ± 2.0 years, range 16–25) transferred after growth completion from two pediatric clinics to the adult endocrine unit. Two separate analyses were performed: (i) cross-sectional analysis of hormonal status, metabolic parameters, BC, and BMD at first evaluation after transfer from pediatrics to the adult department; (ii) longitudinal analysis of BC and BMD dynamics after 3 years of GH replacement therapy (rhGH) in TP.

Results

COGHD was of a congenital cause (CONG) in 50.6% subjects, tumor-related (TUMC) in 23.5%, and idiopathic (IDOP) in 25.9%. TUMC patients had increased insulin and lipids levels (P < 0.01) and lower Z score at L-spine (P < 0.05) compared to CONG and IDOP groups. Patients treated with rhGH in childhood demonstrated lower fat mass and increased BMD compared to the rhGH-untreated group (P < 0.01). Three years of rhGH after growth completion resulted in a significant increase in lean body mass (12.1%) and BMD at L-spine (6.9%), parallel with a decrease in FM (5.2%).

Conclusion

The effect of rhGH in childhood is invaluable for metabolic status, BC, and BMD in transition to adulthood. Tumor-related COGHD subjects are at higher risk for metabolic abnormalities, alteration of body composition, and decreased BMD, compared to those with COGHD of other causes. Continuation of rhGH in transition is important for improving BC and BMD in patients with persistent COGHD.

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