Oestrogen Receptors ERα, ERβ and GPER Mediate the Activation of AMPK
and the Inhibition of the Inflammatory Signaling Pathway TLR4/NFκB
in Dairy Cow Neutrophils
1College
of Animal Science and Technology, Inner Mongolia Minzu University,
Tongliao 028000, China
2Key
Laboratory for Prevention and Control of Herbivorous Livestock
Perinatal Diseases, Inner Mongolia Minzu University, Tongliao
028000, China;
*Corresponding author:
duliyin2016@163.com
Abstract
Different inflammatory diseases in dairy cows are related to the impairment of
neutrophils function, which is affected by blood oestrogen level. In this study,
the molecular mechanism of 17β-oestradiol (E2) receptors mediated by the basal
physiological concentration of E2 in the immune activity and energy status of
circulating cow neutrophils was elucidated in vitro based on 9 blood samples collected
from 3 adult Simmental cows at 2-weeks intervals. Western blotting and
qRT‒PCR were used to investigate E2 nuclear receptors (ERα and ERβ)
and G-protein coupled receptor (GPER) expression in resting and
lipopolysaccharide (LPS)-activated neutrophils at the basal physiological level
of E2 (20 pg/mL) in vitro and the effect on the inflammatory signaling
pathway Toll-like receptor 4 (TLR4)/nuclear factor
kappa B (NFκB) and the AMP-activated protein kinase (AMPK), the regulators of
energy metabolism. Results showed that E2 upregulated GPER protein expression,
and decreased TLR4 mRNA and protein expression, myeloid differentiation Factor
88 (MyD88) mRNA expression and NFκB (p65) phosphorylation, but ERα and ERβ mRNA
and protein expression were not changed. However, ERα mRNA and protein
expression and GPER protein expression were decreased, and ERβ mRNA and protein
expression was increased in activated neutrophils. TLR4 mRNA and protein
expression, MyD88 mRNA expression and NFκB (p65) phosphorylation were
upregulated, while AMPK phosphorylation was inhibited in activated neutrophils,
with an opposite effect on oestrogen-treated neutrophils. In conclusion, basal
physiological E2 concentration can mediate ERα, ERβ and GPER to slow down the
activation of the TLR4/NFκB signaling pathway in LPS-activated neutrophils and
to promote cell energy metabolism in cows.
To Cite This Article:
Wang
X, Zhang Y,
Mao J,
Li Y,
Deng Q,
Jia Z,
Tang M,
Zhang X and
Du L, 2022.
Oestrogen receptors ERα, ERβ and GPER
mediate the activation of AMPK and the inhibition of the inflammatory signaling
pathway TLR4/NFκB in dairy cow neutrophils. Pak Vet J.
http://dx.doi.org/10.29261/pakvetj/2022.077