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GH secretion in a cohort of children with pseudohypoparathyroidism type Ia

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Abstract

Pseudohypoparathyroidism type Ia (PHP-Ia) is characterized by Albright’s hereditary osteodistrophy (AHO) and resistance to hormones that act via the α subunit of the Gs protein (Gsα) protein, ie PTH, TSH, FSH/LH, and, as recently described in limited series, GHRH. However, the current lack of data on GHRH secretion, obesity and short stature included in the AHO phenotype hampers interpretation of GH secretory status and its effects on these subjects. We evaluated GH secretion after GHRH plus arginine (Arg) stimulus, IGF-I levels and anthropometric features in an exclusively pediatric population of 10 PHP-Ia subjects. Of our PHP-Ia children, 5 out of 10 (50%) showed impaired GH responsiveness to the provocative test, with a lower prevalence than the 75–100% previously reported. A negative correlation (p=0.024) was found between GH secretion and body mass index (BMI), whereas no correlation emerged between GH and IGF-I values (p=0.948). Height and growth velocity did not significantly differ between GH-deficient and GH-sufficient subjects. In the 5 GH-deficient patients, GHRH resistance could arguably be responsible for hormonal impairment; however, 3 of them were obese, showing normal stature and IGF-I levels: the increased BMI in these subjects could influence GH secretion and its effects. In conclusion, GH deficiency is frequent among PHP-Ia children and its prevalence is variable, two factors indicating that GH secretory testing should be part of the routine management of this patient group. It could be argued that GHRH resistance is the pathogenetic mechanism in most patients, but further studies on GHRH secretion are needed to define which values can be considered as raised. Lastly, because BMI has been indicated as a major determinant of evoked adult GH response to provocative testing, GH levels related to increased BMI also in childhood could be helpful in defining GH assessment in obese or overweight PHP-Ia children.

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Authors and Affiliations

  1. Department of Pediatrics, University of Turin, Turin, Italy

    L. de Sanctis MD, PhD

  2. Department of Paediatric Endocrinology, Regina Margherita Children’s Hospital, Turin, Italy

    J. Bellone & C. de Sanctis

  3. Department of Pediatrics, Federico II University of Naples, Naples, Italy

    M. Salerno

  4. Department of Pediatrics, IRCCS Burlo Garofolo, Trieste, Italy

    E. Faleschini

  5. Department of Pediatrics, University of Catania, Catania, Italy

    M. Caruso-Nicoletti

  6. Department of Pediatrics, Caldarelli Hospital, Campobasso, Italy

    M. Cicchetti

  7. Department of Pediatrics, University of Catanzaro, Catanzaro, Italy

    D. Concolino

  8. Department of Pediatric Endocrinology, University of Bologna, Bologna, Italy

    A. Balsamo

  9. Department of Pediatrics, University of Brescia, Brescia, Italy

    F. Buzi

  10. Department of Pediatrics, University of Parma, Parma, Italy

    L. Ghizzoni

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  1. L. de Sanctis MD, PhD
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  11. C. de Sanctis
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Correspondence to L. de Sanctis MD, PhD.

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de Sanctis, L., Bellone, J., Salerno, M. et al. GH secretion in a cohort of children with pseudohypoparathyroidism type Ia. J Endocrinol Invest 30, 97–103 (2007). https://doi.org/10.1007/BF03347406

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  • DOI: https://doi.org/10.1007/BF03347406

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