Short stature caused by a biologically inactive mutant growth hormone (GH-C53S).

Besson, Amélie; Salemi, Souzan; Deladoëy, Johnny; Vuissoz, Jean-Marc; Eblé, Andrée; Bidlingmaier, Martin; Bürgi, Sibylle; Honegger, Ulrich; Flück, Christa; Mullis, Primus-Eugen (2005). Short stature caused by a biologically inactive mutant growth hormone (GH-C53S). The Journal of clinical endocrinology and metabolism, 90(5), pp. 2493-2499. The Endocrine Society 10.1210/jc.2004-1838

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Human GH has two disulfide bridges linking Cys-53 to Cys-165 and Cys-182 to Cys-189. Although absence of the first disulfide bridge has been shown to affect the bioactivity of GH in transgenic mice, little is known of the importance of this bridge in mediating the GH/GH-receptor (GHR) interaction in humans. However, we have identified a missense mutation (G705C) in the GH1 gene of a Serbian patient. This mutation was found in the homozygous state and leads to the absence of the disulfide bridge Cys-53 to Cys-165. To study the impact of this mutation in vitro, GHR binding and Janus kinase (Jak)2/signal transducer and activator of transcription (Stat)5 activation experiments were performed, in which it was observed that at physiological concentrations (3-50 ng/ml) both GHR binding and Jak2/Stat5 signaling pathway activation were significantly reduced in the mutant GH-C53S, compared with wild-type (wt)-GH. Higher concentrations (400 ng/ml) were required for this mutant to elicit responses similar to wt-GH. These results demonstrate that the absence of the disulfide bridge Cys-53 to Cys-165 affects the binding affinity of GH for the GHR and subsequently the potency of GH to activate the Jak2/Stat5 signaling pathway. In conclusion, we have demonstrated that GH-C53S is a bioinactive GH at the physiological range and that the disulfide bridge Cys-53 to Cys-163 is required for mediating the biological effects of GH.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Pharmacology
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR)
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine > Endocrinology/Metabolic Disorders
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Endokrinologie / Diabetologie / Metabolik (Pädiatrie)

UniBE Contributor:

Salemi, Souzan; Deladoëy, Johnny; Vuissoz, Jean-Marc; Eblé, Andrée; Bürgi, Sibylle; Flück, Christa and Mullis, Primus-Eugen

Subjects:

600 Technology > 610 Medicine & health
500 Science > 570 Life sciences; biology

ISSN:

1945-7197

Publisher:

The Endocrine Society

Language:

English

Submitter:

Christa Emma Flück Pandey

Date Deposited:

22 Aug 2014 09:23

Last Modified:

22 Aug 2014 09:23

Publisher DOI:

10.1210/jc.2004-1838

PubMed ID:

15713716

URI:

https://boris.unibe.ch/id/eprint/45690

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