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2017 ; 8
(ä): 422
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Male Seminal Relaxin Contributes to Induction of the Post-mating Cytokine
Response in the Female Mouse Uterus
#MMPMID28674503
Glynn DJ
; Heng K
; Russell DL
; Sharkey DJ
; Robertson SA
; Anand-Ivell R
; Ivell R
Front Physiol
2017[]; 8
(ä): 422
PMID28674503
show ga
The hormone relaxin is important in female reproduction for embryo implantation,
cardiovascular function, and during labor and lactation. Relaxin is also
synthesized in males by organs of the male tract. We hypothesized that relaxin
might be one component of seminal plasma responsible for eliciting the female
cytokine response induced in the uterus at mating. When recombinant relaxin was
injected into the uterus of wild-type (Rln(+/+)) mice at estrus, it evoked the
production of Cxcl1 mRNA and its secreted protein product CXCL1 in four of eight
animals. Mating experiments were then conducted using mice with a null mutation
in the relaxin gene (Rln(-/-) mice). qRT-PCR analysis of mRNA expression in
wild-type females showed diminished uterine expression of several cytokine and
chemokine genes in the absence of male relaxin. Similar differences were also
noted comparing Rln(-/-) and Rln(+/+) females mated to wild-type males.
Quantification of uterine luminal fluid cytokine content confirmed that male
relaxin provokes the production of CXCL10 and CSF3 in Rln(+/+) females.
Differences were also seen comparing Rln(-/-) and Rln(+/+) females mated with
Rln(-/-) males for CXCL1, CSF3, and CCL5, implying that endogenous relaxin in
females might prime the uterus to respond appropriately to seminal fluid at
coitus. Finally, pan-leukocyte CD45 mRNA was increased in wild-type matings
compared to other combinations, implying that male and female relaxin may trigger
leukocyte expansion in the uterus. We conclude that male and/or female relaxin
may be important in activating the uterine cytokine/chemokine network required to
initiate maternal immune adaptation to pregnancy.