Publication: A new role for monocytes in modulating myometrial inflammation during human labor
3
Issued Date
2014-01-01
Resource Type
ISSN
15297268
00063363
00063363
Other identifier(s)
2-s2.0-84906256965
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Mahidol University
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SCOPUS
Bibliographic Citation
Biology of Reproduction. Vol.91, No.1 (2014)
Suggested Citation
Khetsopon Srikhajon, Oksana Shynlova, Anyarin Preechapornprasert, Boonsri Chanrachakul, Stephen Lye A new role for monocytes in modulating myometrial inflammation during human labor. Biology of Reproduction. Vol.91, No.1 (2014). doi:10.1095/biolreprod.113.114975 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/33481
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Title
A new role for monocytes in modulating myometrial inflammation during human labor
Abstract
Here we fully characterize the cytokine profile of laboring human myometrium using Luminex analysis of 48 cytokine proteins, and stereologically quantified infiltration of monocytes and neutrophils into the myometrium. We hypothesized that monocytes can regulate their accumulation in the myometrium by disruption of proinflammatory cytokines to prevent an uncontrolled inflammatory response after labor onset. We isolated primary human myometrial cells (HMCs) from term, nonlaboring myometrial biopsies. Confluent HMCs were cocultured directly with human monocytic (THP-1) or lymphocytic (U937) cells, and with the same cells spatially separated by a membrane insert. After 72 h, HMCs and THP-1 were harvested separately, and RNA was extracted and analyzed by quantitative PCR. Coculture supernatants were collected and analyzed by Luminex assay and ELISA. We found that the laboring human myometrium produces significantly higher amounts of interleukin (IL) 6, IL9, IL18, IL1RA, CCL2, CCL7, CXCL8, CSF3, and tumor necrosis factor alpha, which coincides with the influx of immune cells. The direct contact or presence of THP-1 monocytes (but not U937 cells) significantly decreased CCL2 protein levels and increased IL1RA protein levels secreted by HMCs. This time-dependent decrease of CCL2 was greater with increasing number of monocytes being in direct contact with HMCs. We suggest a novel mechanism by which monocytes are first recruited to the myometrium by multiple cytokines and contribute to the physiologic inflammation of labor. After completing transmigration, activated monocytes disrupt locally established CCL2 gradients (possible by CCR2-mediated consumption) to limit their accumulation in the uterus. This mechanism may serve as a negative feedback loop to control the local inflammation and promote a return to homeostasis. © 2014 by the Society for the Study of Reproduction, Inc.