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Res. Commun."],"published-print":{"date-parts":[[2025,3,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>\n                  <jats:italic>Background.<\/jats:italic> Exposure to PM<jats:sub>2.5<\/jats:sub> is associated with adverse birth outcomes and early development. Pregnancy is typically characterized by the production of several important hormones that impact aspects of maternal and fetal physiology, including progesterone, estriol, and corticotropin releasing hormone (CRH). No previous studies have examined PM associations in pregnant persons for CRH and estriol. <jats:italic>Methods.<\/jats:italic> We used linear mixed effects models to investigate associations between PM<jats:sub>2.5<\/jats:sub> and pregnancy hormones in 1,041 pregnant persons ages 18\u201341 living in Puerto Rico between 2011 and 2020. Individual 3\u2013, 7\u2013, and 30-day moving average exposures were assigned from EPA data sources. Hormone levels were analyzed in blood collected at study visits at 16\u201320 and 20\u201324 weeks of gestation. Models were adjusted for demographics, socioeconomic status, and health behaviors.<jats:italic>Results.<\/jats:italic> Mean participant exposures for 3\u2212, 7\u2212, and 30-day PM<jats:sub>2.5<\/jats:sub> were 8.0 \u00b1 5.9, 8.2 \u00b1 5.3, and 8.1 \u00b1 4.4 \u03bcg m<jats:sup>\u22123<\/jats:sup>. In base models, increased PM<jats:sub>2.5<\/jats:sub> exposure was associated with lower levels of progesterone, CRH, and estriol. In adjusted models, 10 \u03bcg m<jats:sup>\u22123<\/jats:sup> increase in PM<jats:sub>2.5<\/jats:sub> was associated with 11.2% (95% CI: 17.6, 4.3; p = 0.003) and 14.9% (95% CI: 23.4, 5.4; p = 0.004) lower CRH for 7-day and 30-day exposures. In cross-sectional models, the inverse CRH association was driven by the 20\u201324 week gestation period with a 12.4% reduction (95% CI: 21.8, 1.9; p = 0.022) for 7-day and 17.5% reduction (95% CI: 29.7, 3.0; p = 0.020) for 30-day exposure. Other investigated associations were null.<jats:italic>Conclusions.<\/jats:italic> In pregnant persons in Puerto Rico, we observed that elevated PM<jats:sub>2.5<\/jats:sub> exposures were significantly associated with decrements in CRH, but not in other pregnancy-associated hormones. CRH may be an important pathway through which prenatal PM<jats:sub>2.5<\/jats:sub> impacts normal pregnancy.<\/jats:p>","DOI":"10.1088\/2515-7620\/adc0f1","type":"journal-article","created":{"date-parts":[[2025,3,14]],"date-time":"2025-03-14T22:54:21Z","timestamp":1741992861000},"page":"031008","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Associations among PM<sub>2.5<\/sub>, corticotropin releasing hormone, estriol, and progesterone in pregnant persons in Puerto Rico"],"prefix":"10.1088","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4620-5717","authenticated-orcid":true,"given":"Trenton","family":"Honda","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8805-4406","authenticated-orcid":true,"given":"Trenton","family":"Henry","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christina A","family":"Porucznik","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura","family":"Corlin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kipruto","family":"Kirwa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Akram","family":"Alshawabkeh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0564-6391","authenticated-orcid":true,"given":"Jos\u00e9 F","family":"Cordero","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carmen M","family":"Velez Vega","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zaira Y","family":"Rosario Pabon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John D","family":"Meeker","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Helen","family":"Suh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2025,3,26]]},"reference":[{"article-title":"O.f.E.C.-o.a.D. 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