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Physiological and Pathological Implications of Retinoid Action in the Endometrium

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Physiological and Pathological Implications of Retinoid Action in the Endometrium 236 3 Journal of Y Jiang et al. Retinoids and endometrium 236:3 R169–R188 Endocrinology REVIEW Physiological and pathological implications of retinoid action in the endometrium Yanwen Jiang1, Lu Chen1, Robert N Taylor2, Chunjin Li1,* and Xu Zhou1,* 1College of Animal Sciences, Jilin University, Changchun, Jilin, China 2Departments of Obstetrics and Gynecology and Molecular Medicine and Translational Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA Correspondence should be addressed to X Zhou or C Li: [email protected] or [email protected] *(C Li and X Zhou contributed equally to this work) Abstract Retinol (vitamin A) and its derivatives, collectively known as retinoids, are required for Key Words maintaining vision, immunity, barrier function, reproduction, embryogenesis and cell f retinoids proliferation and differentiation. Despite the fact that most events in the endometrium f endometrial stroma are predominantly regulated by steroid hormones (estrogens and progesterone), f implantation accumulating evidence shows that retinoid signaling is also involved in the development f endometriosis and maintenance of the endometrium, stromal decidualization and blastocyst implantation. Moreover, aberrant retinoid metabolism seems to be a critical factor in the development of endometriosis, a common gynecological disease, which affects up to 10% of reproductive age women and is characterized by the ectopic localization of endometrial-like tissue in the pelvic cavity. This review summarizes recent advances in research on the mechanisms and molecular actions of retinoids in normal endometrial development and physiological function. The potential roles of abnormal retinoid signaling in endometriosis are also discussed. The objectives are to identify limitations in current knowledge regarding the molecular actions of retinoids in endometrial biology and to stimulate new investigations toward the development potential therapeutics to Journal of Endocrinology ameliorate or prevent endometriosis symptoms. (2018) 236, R169–R188 Introduction In many species, such as human, nonhuman primates and epithelium under unopposed estrogenic action (Cheng rodents, the endometrium consists of epithelial glands et al. 2008). Though progesterone is critical for the supported by a connective tissue stroma that undergoes initiation and maintenance of decidualization in the cycles of proliferation and secretory activity. The uterine estrogen-primed endometrium, other factors, including mucosa proliferates under the influence of estrogen. prostaglandins, prolactin, growth factors and extracellular However, after ovulation, luteal progesterone changes the matrix proteins, are important. proliferative pattern to a secretory pattern that includes Retinoic acid (RA), the physiological active metabolite decidualization of endometrial stromal cells, which of vitamin A (retinol), controls multiple biological provides the nutritive and immune-privileged matrix for processes, including differentiation, apoptosis and cell embryo implantation (Gellersen & Brosens 2014) and survival, via its nuclear receptors RARs or nonclassical prevents the malignant transformation of endometrial RA receptor peroxisome proliferator-activated http://joe.endocrinology-journals.org © 2018 Society for Endocrinology https://doi.org/10.1530/JOE-17-0544 Published by Bioscientifica Ltd. Printed in Great Britain Downloaded from Bioscientifica.com at 10/05/2021 07:30:05AM via free access 10.1530/JOE-17-0544 Journal of Y Jiang et al. Retinoids and endometrium 236:3 R170 Endocrinology receptor β/δ (PPARβ/δ). The pathway of RA is also signaling. This contention was recently supported in considered to be involved in the proliferation of a mouse model of endometriosis where treatment with epithelia and the transformation of endometrial stromal RA suppressed IL-6 and the establishment, growth and cells into specialized decidual cells. Numerous studies vascularity of peritoneal implants, promoted macrophage have demonstrated that the distribution of RA (Zheng differentiation (Wieser et al. 2012). et al. 2000), as well as the expression of RA receptors RA plays fundamental roles in the normal (Fukunaka et al. 2001, Ozaki et al. 2017), cellular retinol maintenance of endometrial physiology (Zheng and RA-binding proteins (CRBP1, CRABP1 and CRABP2; et al. 2000, Sidell et al. 2002, Ding et al. 2003, Kuroda Zheng & Ong 1998, Zheng et al. 2000), RA-synthesizing et al. 2013), and aberrant RA metabolism might be a enzymes ALDH1A1 and ALDH1A2 (Napoli 1999, Duester predisposing factor for the development of endometriosis 2000), and the RA-catabolizing enzyme CYP26A1 (Vermot (Pavone et al. 2011, Wieser et al. 2012, Pierzchalski et al. et al. 2000) are highly and differentially regulated in 2014, Yamagata et al. 2015). However, a comprehensive the differentiating endometrium during the ovarian and systematic analysis and understanding of RA cycle and during the phase of blastocyst implantation pathway in endometrial physiology and pathology (Vermot et al. 2000, Zheng 2000, Ozaki et al. 2017). remain lacking. In this review, the latest advances The expression of these same genes can be modulated with regard to understanding the retinoid pathway by ovarian steroid hormones (i.e., estradiol and are first discussed, followed by an assessment of the progesterone) treatment (Vermot et al. 2000, Li & Ong functional roles of this signaling network in endometrial 2003, Rühl et al. 2006, Fritzsche et al. 2007). The retinoid development and physiological function. This review also pathway is known to play vital roles in endometrial summarizes evidence that supports fundamental defects development and differentiation (Tanmahasamut & in retinoid metabolism and action among women with Sidell 2005, Wu et al. 2013, Nakajima et al. 2016), as well endometriosis. The objectives are to identify limitations as endometrial neovascularization (Sidell et al. 2010) and in our current knowledge regarding molecular retinoid blastocyst implantation (Han et al. 2010, Xia et al. 2010, actions in endometrial biology and to propose future Ma et al. 2012). investigations to develop therapeutic or preventative In addition, accumulating evidence shows that an agents for clinical endometriosis management. aberrant RA metabolism can be a critical factor in the development of endometriosis (Pavone et al. 2011, Wieser et al. 2012, Pierzchalski et al. 2014, Yamagata et al. 2015), Retinoid metabolism and signaling a common gynecological disease that affects up to 10% of reproductive-age women. This disease is characterized Retinol (vitamin A) is a lipid-soluble vitamin that cannot by the ectopic localization of endometrial-like tissues be synthesized de novo by animals and is obtained from the in the pelvic cavity, and its pathogenesis involves diet as either preformed retinoids or carotenoids within uncontrollable cell proliferation and is associated the intestine. In the enterocytes, proretinoid carotenoids, with local invasion and distant metastasis. Among the such as β-carotene, can be either cleaved and converted numerous aspects of endometrial behavior regulated by to retinoids or incorporated intact and unmodified along RA are matrix metalloproteinase secretion, gap junctional with dietary fat and cholesterol into chylomicrons. Dietary intracellular communication and the production of retinoids that are newly absorbed by the enterocytes are various cytokines involved in stromal cell growth, esterified to retinyl ester and packaged with dietary fat and adhesion and differentiation (Wu et al. 2013). Interleukin cholesterol into chylomicrons, which are later secreted 6 (IL-6), monocyte chemotactic protein 1 (MCP-1), tumor into the lymphatic system. Approximately 66%–75% of necrosis factor α (TNF-α), vascular endothelial growth newly acquired retinoids are absorbed and stored in the factor (VEGF) and connexin43 are all aberrantly expressed liver as lipid droplet retinyl esters (Harrison 2005). The in endometriotic lesions (Sawatsri et al. 2000, Sharpe- remainder is absorbed by extrahepatic tissues (Quadro Timms 2001, Nozaki et al. 2006, Sidell et al. 2010, Wu 2004). In cases of dietary vitamin A deficiency, the stored et al. 2013). Thus, many seemingly discordant features of retinoid is hydrolyzed and mobilized back to retinol, endometriosis, including decreased cell death, increased which can be bound by RBP4 and enter the bloodstream growth and migration, inflammation and enhanced for transport to peripheral tissues. In blood, holo-RBP4 invasive properties of intraperitoneally seeded endometrial is bound to transthyretin (TTR), a carrier protein for cells, might be accounted for by the dysregulation of RA thyroid hormones. In a fasting circulation, retinol-RBP4 http://joe.endocrinology-journals.org © 2018 Society for Endocrinology https://doi.org/10.1530/JOE-17-0544 Published by Bioscientifica Ltd. Printed in Great Britain Downloaded from Bioscientifica.com at 10/05/2021 07:30:05AM via free access Review Journal of Y Jiang et al. Retinoids and endometrium 236:3 R171 Endocrinology is the preponderant retinoid form comprising >95% of Cellular retinol can be stored in the form of retinyl ester retinoids, whereas, after a retinoid-rich meal, chylomicron catalyzed by lecithin: retinol acyltransferase (LRAT) or retinyl ester concentrations exceed those of retinol-RBP4. converted into transcriptionally active RA metabolites In extrahepatic tissues, retinoids are acquired from the via two enzymatic reactions. First, retinol
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