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Identification of uterine pacemaker regions at the myometrial-placental interface in the rat

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Lutton, E. Josiah, Lammers, Wim J. E. P., James, Sean G., Berg, Hugo van den and Blanks, Andrew M. (2018) Identification of uterine pacemaker regions at the myometrial-placental interface in the rat. The Journal of Physiology, 596 (14). pp. 2841-2852. doi:10.1113/JP275688

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Official URL: http://dx.doi.org/10.1113/JP275688

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Abstract

Coordinated uterine contractions are essential for delivering viable offspring in mammals. In contrast to other visceral smooth muscles, it is not known where excitation within the uterus is initiated, and no defined pace‐making region has hitherto been identified. Using multi‐electrode array recordings and high‐resolution computational reconstruction of the three‐dimensional micro‐structure of late pregnant rat uterus, we demonstrate that electrical potentials are initiated in distinct structures within the placental bed of individual implantation sites. These previously unidentified structures represent modified smooth muscle bundles that are derived from bridges between the longitudinal and circular layers. Coordinated implantation and encapsulation by invading trophoblast give rise to isolated placental/myometrial interface bundles that directly connect to the overlying longitudinal smooth muscle layer. Taken together, these observations imply that the anatomical structure of the uterus, combined with site‐specific implantation, gives rise to emergent patterns of electrical activity that drive effective contractility during parturition.

Item Type: Journal Article
Subjects: Q Science > QP Physiology
Divisions: Faculty of Medicine > Warwick Medical School > Biomedical Sciences > Cell & Developmental Biology
Faculty of Medicine > Warwick Medical School > Biomedical Sciences
Faculty of Science > Mathematics
Faculty of Medicine > Warwick Medical School
Library of Congress Subject Headings (LCSH): Uterus -- Contraction, Myometrium, Rats -- Parturition, Excitation (Physiology)
Journal or Publication Title: The Journal of Physiology
Publisher: Blackwell
ISSN: 0022-3751
Official Date: 15 July 2018
Dates:
DateEvent
15 July 2018Published
28 April 2018Available
19 April 2018Accepted
Volume: 596
Number: 14
Page Range: pp. 2841-2852
DOI: 10.1113/JP275688
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
G0900208-2[MRC] Medical Research Councilhttp://dx.doi.org/10.13039/501100000265

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