The luteinizing hormone/chorionic gonadotropin receptor has distinct transmembrane conductors for cAMP and inositol phosphate signals.

Gilchrist, R.L.; Ryu, Kyeong‐Sik; Ji, Inhae; Ji, Tae H.

doi:10.1016/s0021-9258(18)39930-7

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“…Activate LHCGR couples to Gα s G-proteins to initiate the adenylyl cyclase, cAMP and protein kinase A (PKA) signalling pathway (1, 10), but it can also activate extracellular signal-regulated kinase (ERK) and protein kinase B (PKB/AKT) to drive cell proliferation, differentiation and survival (1, 12). In addition, at high hormone and receptor levels, LHCGR can also couple to Gα q G-proteins to activate phospholipase C and inositol phosphate signalling to increase intracellular Ca 2+ (13, 14).…”

Section: Introductionmentioning

confidence: 99%

Lack of evidence for functional luteinising hormone chorionic gonadotropin receptors in non-pregnant human endometrial stromal cells

Mann

Lucas

et al. 2022

Preprint

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The human luteinising hormone chorionic gonadotropin receptor (LHCGR) is a G-protein coupled receptor activated by both human chorionic gonadotropin (hCG) and luteinizing hormone (LH), two structurally related gonadotropins with essential roles in ovulation and maintenance of the corpus luteum. LHCGR expression predominates in ovarian tissues where it elicits functional responses through cyclic adenosine mononucleotide (cAMP), Ca2+ and extracellular signal-regulated kinase (ERK) signalling. LHCGR has also been localized to the human endometrium, with purported roles in decidualization and implantation. However, these observations are contentious. In this investigation, transcripts encoding LHCGR were undetectable in bulk RNA sequencing datasets from whole cycling endometrial tissue and cultured human endometrial stromal cells (EnSC). However, analysis of single-cell RNA sequencing data revealed cell-to-cell transcriptional heterogeneity and identified a small subpopulation of stromal cells with discernible LHCGR transcripts. In HEK-293 cells expressing recombinant LHCGR, both hCG and LH elicited robust cAMP, Ca2+ and ERK signals that were absent in wild type HEK-293 cells. However, none of these responses were recapitulated in primary EnSC cultures. In addition, proliferation, viability and decidual transformation of EnSC were refractory to both hCG and LH, irrespective of treatment to induce differentiation. Although we challenge the assertion that LHCGR is expressed at a functionally active level in the human endometrium, the discovery of a discrete subpopulation of EnSC that express LHCGR transcripts may plausibly account for the conflicting evidence in the literature.

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