Regulatory mechanisms for natriuretic peptide signalling in sheep granulosa cells.

Abstract:

:Natriuretic peptides (NPs) have been reported to have critical roles in follicular development and oocyte maturation in rodents. This study aimed to extend our current understanding of NP-mediated signalling pathways and mechanisms of action in the follicles of a monovulatory species. Ovine granulosa cells (GCs) and theca cells (TCs) were cultured under conditions designed to allow gonadotrophin-stimulated cell differentiation. Gene expression analysis was performed by qualitative (q)PCR for NPs and NPRs (between 16 and 96 h of culture) and VEGF120 and VEGF164 (between 16 and 144 h of culture). A qualitative analysis of the production of NP/NPR family members and NP ligand/receptor associations was carried out utilising a highly sensitive immunological approach known as 'proximity ligation assay' (PLA). All NPRs were observed in GCs, while NPRA was absent in TCs. In GCs, gene expression of NPRA, NPRB and NPRC was apparent but only active BNP and CNP and not ANP, were detected. Also in GCs, ANP but not CNP was able to significantly (P < 0.05) reduce oestradiol and increase (P < 0.05) progesterone. Inhibition of VEGF164 by ANP and CNP (P < 0.01) after 48 h of culture preceded up-regulation of VEGF120 by ANP (P < 0.01) after 144 h, but not CNP. Taken together, these findings appear to demonstrate that NP responsiveness in the GC compartment of sheep follicles is multi-facilitated, utilising both autocrine and paracrine stimulation pathways.

journal_name

J Mol Endocrinol

authors

Alhamdan R,Maalouf W,Campbell BK,Hernandez-Medrano JH,Marsters P

doi

10.1530/JME-20-0034

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

223-234

issue

4

eissn

0952-5041

issn

1479-6813

pii

JME-20-0034

journal_volume

64

pub_type

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