Format

Send to

Choose Destination
Reprod Biomed Online. 2016 Jun;32(6):635-41. doi: 10.1016/j.rbmo.2016.03.003. Epub 2016 Mar 29.

Luteinizing hormone/chorionic gonadotrophin receptor overexpressed in granulosa cells from polycystic ovary syndrome ovaries is functionally active.

Author information

1
Institute of Life Science 1, College of Medicine, Swansea University, Swansea, UK. Electronic address: k.venkateswarlu@swansea.ac.uk.
2
Bristol Centre for Reproductive Medicine, North Bristol NHS Trust, Southmead Hospital, Westbury-on-Trym, Bristol, UK.
3
Division of Obstetrics and Gynaecology, School of Clinical Sciences, University of Bristol, Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology, Bristol, UK.

Abstract

Polycystic ovarian syndrome (PCOS) is associated with anovulatory infertility. Luteinizing hormone/chorionic gonadotrophin receptor (LHCGR), which is critical for ovulation, has been suggested to be expressed prematurely in the ovarian follicles of women with PCOS. This study aimed to analyse the expression and activity of LHCGR in ovarian granulosa cells from PCOS patients and the involvement of ARF6 small GTPase in LHCGR internalization. Granulosa cells (GC) isolated from follicular fluid collected during oocyte retrieval from normal women (n = 19) and women with PCOS (n = 17) were used to study differences in LHCGR protein expression and activity between normal and PCOS patients. LHCGR expression is up-regulated in GC from PCOS women. LHCGR in PCOS GC is functionally active, as shown by increased cAMP production upon human gonadotrophin (HCG)-stimulation. Moreover, ARF6 is highly expressed in GC from PCOS patients and HCG-stimulation increases the concentrations of active ARF6. The inhibition of ARF6 activation attenuates HCG-induced LHCGR internalization in both normal and PCOS GC, indicating that there are no alterations in LHCGR internalisation in GC from PCOS. In conclusion, the expression and activation of LHCGR and ARF6 are up-regulated in GC from PCOS women but the mechanism of agonist-induced LHCGR internalization is unaltered.

KEYWORDS:

ARF6; LHCGR; PCOS; cAMP; human granulosa cells

PMID:
27061682
DOI:
10.1016/j.rbmo.2016.03.003
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center