Alteration of ZnT5-mediated zinc import into the early secretory pathway affects the secretion of growth hormone from rat pituitary cells

Petkovic, Vibor; Miletta, Maria Consolata; Eblé, Andrée; Flück, Christa; Mullis, Primus-Eugen (2014). Alteration of ZnT5-mediated zinc import into the early secretory pathway affects the secretion of growth hormone from rat pituitary cells. Hormone research in paediatrics, 82(4), pp. 245-251. Karger 10.1159/000365924

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BACKGROUND Aggregation of growth hormone (GH) required for its proper storage in granules is facilitated by zinc (Zn(2+)) transported by specific zinc transporters in and out of the regulated secretory pathway. Slc30a5 (ZnT5) was reported to have the highest gene expression among all zinc transporters in primary mouse pituitary cells while ZnT5-null mice presented with abnormal bone development and impaired growth compared to wild-type counterparts. METHODS In vitro studies performed in GH3 cells, a rat pituitary cell line that endogenously produces rat GH (rGH), included analysis of: cytoplasmic Zn(2+) pool changes after altering rSlc30a5 expression (luciferase assay), rZnT5 association with different compartments of the regulated secretory pathway (confocal microscopy), and the rGH secretion after rSlc30a5 knock-down (Western blot). RESULTS Confocal microscopy demonstrated high co-localization of rZnT5 with ER and Golgi (early secretory pathway) while siRNA-mediated knock-down of rSlc30a5 gene expression led to a significant reduction in rGH secretion. Furthermore, altered expression of rSlc30a5 (knock-down/overexpression) evoked changes in the cytoplasmic Zn(2+) pool indicating its important role in mediating Zn(2+) influx into intracellular compartments of the regulated secretory pathway. CONCLUSION Taken together, these results suggest that ZnT5 might play an important role in regulated GH secretion that is much greater than previously anticipated.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Petkovic, Vibor; Miletta, Maria Consolata; Eblé, Andrée; Flück, Christa and Mullis, Primus-Eugen

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1663-2818

Publisher:

Karger

Language:

English

Submitter:

André Schaller

Date Deposited:

20 Mar 2015 11:47

Last Modified:

29 Oct 2015 10:19

Publisher DOI:

10.1159/000365924

PubMed ID:

25196974

BORIS DOI:

10.7892/boris.65298

URI:

https://boris.unibe.ch/id/eprint/65298

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