Cigarette Smoking Affects Uterine Receptivity Markers

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Cigarette smoking decreased expression of endometrial receptivity markers CXCL12 and FGF2 in vitro, in mice, and in human samples.

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The study evaluated how cigarette smoking affects human uterine endometrial physiology by examining the cytokines CXCL12 and FGF2, and related them to uterine receptivity, using both in vitro experiments (human endometrial stromal cell lines and primary cells treated with cigarette smoking extract) and in vivo mouse experiments (uterine tissue after 8 weeks of cigarette smoke exposure). In parallel, human endometrial samples from nonsmokers and smokers were analyzed by real-time RT-PCR and, in mice, by immunohistochemistry for CXCL12 and FGF2 protein. Both CXCL12 and FGF2 mRNA and protein levels were significantly decreased in smoking-exposed cells and mice, and similarly lower in endometrium from women who smoke. The paper’s main caveat is that its findings focus on specific receptivity-associated markers rather than directly measuring fertility outcomes. This paper is centrally about endometriosis — it discusses smoking-associated, reduced prevalence of endometriosis and links decreased CXCL12 and FGF2 expression to mechanisms implicated in endometriosis.

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Abstract

ObjectiveSmoking negatively affects fertility and the rate of other endometrial diseases. To determine the effect of smoking on endometrial physiology, we evaluated 2 endometrial regulatory cytokines and receptivity markers, C-X-C motif chemokine ligand 12 (CXCL12) and fibroblast growth factor 2 (FGF2), both in vitro and in vivo.Study designThe human endometrial stromal cell line (HESC) and primary human endometrial stromal cells were treated with cigarette smoking extract (CSE) or with vehicle control. Twenty female mice were randomly assigned to either cigarette smoke (CS) exposure for 8 weeks or to a nonsmoke (NS) group that received room air. Immunohistochemical analysis of CXCL12 and FGF2 expression was performed in mouse uterine tissue. Human endometrial samples were obtained from both nonsmokers and smokers. Real-time reverse transcription-polymerase chain reaction was performed for all cell cultures and human samples.ResultsCompared to controls, CXCL12 and FGF2 mRNA expression were significantly decreased in CSE-exposed HESC and primary cells. In mice, immunohistochemical analysis showed that both CXCL12 and FGF2 protein expression was lower in the CS group compared to controls. Similarly, both CXCL12 and FGF2 expression were decreased in women who smoke compared to nonsmokers.ConclusionDecreased endometrial CXCL12 and FGF2 expression contribute to the impaired endometrial receptivity in women who smoke. Smoking is also associated with decreased rates of endometrial cancer and endometriosis; increased CXCL12 and FGF2 are implicated in both conditions. The changes in the expression of cytokines described here may explain the impact of smoking on all of these diseases. Tobacco has direct effects on normal endometrium that impacts endometrial health and disease.
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Abstract

Objective Smoking negatively affects fertility and the rate of other endometrial diseases. To determine the effect of smoking on endometrial physiology, we evaluated 2 endometrial regulatory cytokines and receptivity markers, C-X-C motif chemokine ligand 12 (CXCL12) and fibroblast growth factor 2 (FGF2), both in vitro and in vivo. Study Design The human endometrial stromal cell line (HESC) and primary human endometrial stromal cells were treated with cigarette smoking extract (CSE) or with vehicle control. Twenty female mice were randomly assigned to either cigarette smoke (CS) exposure for 8 weeks or to a nonsmoke (NS) group that received room air. Immunohistochemical analysis of CXCL12 and FGF2 expression was performed in mouse uterine tissue. Human endometrial samples were obtained from both nonsmokers and smokers. Real-time reverse transcription-polymerase chain reaction was performed for all cell cultures and human samples.

Results

Compared to controls, CXCL12 and FGF2 mRNA expression were significantly decreased in CSE-exposed HESC and primary cells. In mice, immunohistochemical analysis showed that both CXCL12 and FGF2 protein expression was lower in the CS group compared to controls. Similarly, both CXCL12 and FGF2 expression were decreased in women who smoke compared to nonsmokers.

Conclusion

Decreased endometrial CXCL12 and FGF2 expression contribute to the impaired endometrial receptivity in women who smoke. Smoking is also associated with decreased rates of endometrial cancer and endometriosis; increased CXCL12 and FGF2 are implicated in both conditions. The changes in the expression of cytokines described here may explain the impact of smoking on all of these diseases. Tobacco has direct effects on normal endometrium that impacts endometrial health and disease. Similar content being viewed by others

References

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Sci. 24, 989–995 (2017). https://doi.org/10.1177/1933719117697129 Published: Version of record: Issue date: DOI: https://doi.org/10.1177/1933719117697129

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MeSH descriptors

Chemokine CXCL12 Cigarette Smoking Endometrium Fibroblast Growth Factor 2 Smoke Stromal Cells Adult Animals Cell Line Chemokine CXCL12 Cigarette Smoking Endometrium Endometrium Female Fibroblast Growth Factor 2 Humans Mice Stromal Cells Stromal Cells Young Adult

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