tetano
Editor, Senior Moderator
J Reprod Dev
. 2022 Jan 27.
doi: 10.1262/jrd.2021-126. Online ahead of print.
Spike protein of SARS-CoV-2 suppresses gonadotrophin secretion from bovine anterior pituitaries
Dimas Arya Abdillah[SUP] 1 [/SUP], Onalenna Kereilwe[SUP] 1 [/SUP], Raihana Nasrin Ferdousy[SUP] 1 [/SUP], Risa Saito[SUP] 1 [/SUP], Hiroya Kadokawa[SUP] 1 [/SUP]
Affiliations
Abstract
Coronavirus disease (COVID-19), the ongoing global pandemic, is caused by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). Recent evidence shows that the virus utilizes angiotensin-converting enzyme 2 (ACE2) as a spike protein receptor for entry into target host cells. The bovine ACE2 contains key residues for binding to the spike protein receptor-binding domain. This study evaluated the hypothesis that bovine gonadotroph expresses ACE2, and spike protein suppresses luteinizing hormone (LH) and follicle-stimulating hormone (FSH) secretion from cultured bovine anterior pituitary (AP) cells. ACE2 mRNA expression and ACE2 protein expression were detected in the bovine AP cells using reverse transcription PCR and western blot analysis. Immunofluorescence microscopy analysis with the anti-ACE2 antibody revealed the co-localization of ACE2 and gonadotropin-releasing hormone (GnRH) receptor on the gonadotroph plasma membrane. Approximately 90% of GnRH receptor-positive cells expressed ACE2, and approximately 46% of ACE2-positive cells expressed the GnRH receptor. We cultured bovine AP cells for 3.5 days and treated them with increasing concentrations (0, 0.07, 0.7, or 7 pM) of recombinant spike protein having both S1 and S2 regions. The spike protein (0.07-7 pM) suppressed both basal and GnRH-induced LH secretion (P < 0.05). Spike protein (0.7-7 pM) suppressed GnRH-induced (P < 0.05), but not basal FSH secretion. In contrast, pre-treatment with ERK 1/2/5 inhibitor (U0126) partially restored the GnRH-induced LH and FSH secretion from the spike protein suppression. Collectively, the results indicate that gonadotrophs express ACE2, a receptor for coronavirus 2 spike protein, which in turn suppresses LH and FSH secretion from AP cells.
Keywords: Angiotensin-converting enzyme 2 (ACE2); Anterior pituitary gland; Coronavirus disease (COVID-19); Gonadotroph; S1; S2.
. 2022 Jan 27.
doi: 10.1262/jrd.2021-126. Online ahead of print.
Spike protein of SARS-CoV-2 suppresses gonadotrophin secretion from bovine anterior pituitaries
Dimas Arya Abdillah[SUP] 1 [/SUP], Onalenna Kereilwe[SUP] 1 [/SUP], Raihana Nasrin Ferdousy[SUP] 1 [/SUP], Risa Saito[SUP] 1 [/SUP], Hiroya Kadokawa[SUP] 1 [/SUP]
Affiliations
- PMID: 35082199
- DOI: 10.1262/jrd.2021-126
Abstract
Coronavirus disease (COVID-19), the ongoing global pandemic, is caused by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). Recent evidence shows that the virus utilizes angiotensin-converting enzyme 2 (ACE2) as a spike protein receptor for entry into target host cells. The bovine ACE2 contains key residues for binding to the spike protein receptor-binding domain. This study evaluated the hypothesis that bovine gonadotroph expresses ACE2, and spike protein suppresses luteinizing hormone (LH) and follicle-stimulating hormone (FSH) secretion from cultured bovine anterior pituitary (AP) cells. ACE2 mRNA expression and ACE2 protein expression were detected in the bovine AP cells using reverse transcription PCR and western blot analysis. Immunofluorescence microscopy analysis with the anti-ACE2 antibody revealed the co-localization of ACE2 and gonadotropin-releasing hormone (GnRH) receptor on the gonadotroph plasma membrane. Approximately 90% of GnRH receptor-positive cells expressed ACE2, and approximately 46% of ACE2-positive cells expressed the GnRH receptor. We cultured bovine AP cells for 3.5 days and treated them with increasing concentrations (0, 0.07, 0.7, or 7 pM) of recombinant spike protein having both S1 and S2 regions. The spike protein (0.07-7 pM) suppressed both basal and GnRH-induced LH secretion (P < 0.05). Spike protein (0.7-7 pM) suppressed GnRH-induced (P < 0.05), but not basal FSH secretion. In contrast, pre-treatment with ERK 1/2/5 inhibitor (U0126) partially restored the GnRH-induced LH and FSH secretion from the spike protein suppression. Collectively, the results indicate that gonadotrophs express ACE2, a receptor for coronavirus 2 spike protein, which in turn suppresses LH and FSH secretion from AP cells.
Keywords: Angiotensin-converting enzyme 2 (ACE2); Anterior pituitary gland; Coronavirus disease (COVID-19); Gonadotroph; S1; S2.