The adult uterus undergoes repeated cycles of """"""""injury and repair"""""""" in response to hormonal signals during the estrous cycle in mice (or the menstrual cycle in primates) numerous times in a normal mammalian reproductive lifespan, as well as during pregnancy when it grows ten-fold to accommodate the fetus. Although this process of remodeling is essential for reproduction, the molecular mechanisms involved are largely unknown, particularly in primates where the top layer of the endometrium is shed and regenerated every month. The principal investigators have shown that conditional deletion of ?-catenin in the Mullerian duct mesenchyme results in a progressive replacement of uterine smooth muscle cells in the myometrium with adipose tissue. They have also shown that the converse experiment with conditional expression of a gain-of-function allele of ?-catenin results in myometrial smooth muscle hyperplasia and development of stromal sarcomas and leiomyoma's (uterine fibroids). Both phenotypes were observed only after mice entered sexual maturity, suggesting that the mechanisms disrupted in these mice are regulated by ovarian steroid hormones. The principal investigators hypothesize that disruption of the nuclear function of ?-catenin, a key determinant of stemness in many stem cell microenvironments, in myometrial stem cells leads to these uterine pathologies. They have identified the regenerative myometrial smooth muscle stem cells in mice and in humans and propose to investigate whether endocrine disruptors (1) impact the differentiation and pluripotency of myometrial stem cells in vitro and in vivo during cycling, pregnancy, and leiomyoma development;(2) dysregulate the molecular mechanisms of Wnt/?-catenin signaling in our gain-of-function and loss-of-function models;and (3) alter the differentiation and pluripotency of myometrial stem cells during the perinatal window of myometrial development. The results of these experiments will help determine whether endocrine disruptors have a significant impact on the differentiation and function of myometrial stem cells. Performing these experiments in unique mouse models of dysregulated Wnt/?-catenin signaling will also help determine which of the molecular mechanisms used by ?-catenin, during normal and conditionally disrupted differentiation and in the adult activities of the myometrial stem cells, are affected. The principal investigator predict that an environmentally relevant level of exposure to endocrine disruptors plays an important role in uterine biology, particularly at the myometrial stem cell level and its contribution to uteine fibroid etiology and pathophysiology.

Public Health Relevance

Uterine fibroids afflict approximately 20% of American women during their reproductive years and are a significant source of pelvic pain, abnormal uterine bleeding, and infertility. Uterine fibroids are also the major reason for hysterectomies in the United States. Despite the major health care burden posed by uterine fibroids, very little is known about their cause or the best treatment strategies. The overall aims of the proposed studies are to understand the effects of environmental exposure to endocrine-disrupting compounds (EDCs) on the stem cells that are responsible for uterine fibroid development and determine whether therapeutic intervention at the stem cell level can lead to better management strategies for this disease.

National Institute of Health (NIH)
Office of The Director, National Institutes of Health (OD)
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Special Emphasis Panel (ZES1-TN-D (ST))
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Mirochnitchenko, Oleg
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Massachusetts General Hospital
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Patterson, Amanda L; George, Jitu W; Chatterjee, Anindita et al. (2018) Label-Retaining, Putative Mesenchymal Stem Cells Contribute to Myometrial Repair During Uterine Involution. Stem Cells Dev :
Patterson, Amanda L; Pirochta, Jamieson; Tufano, Stephanie Y et al. (2017) Gain-of-function ?-catenin in the uterine mesenchyme leads to impaired implantation and decidualization. J Endocrinol 233:119-130
Syed, Khaja Mohieddin; Joseph, Sunu; Mukherjee, Ananda et al. (2016) Histone chaperone APLF regulates induction of pluripotency in murine fibroblasts. J Cell Sci 129:4576-4591
Commandeur, Arno E; Styer, Aaron K; Teixeira, Jose M (2015) Epidemiological and genetic clues for molecular mechanisms involved in uterine leiomyoma development and growth. Hum Reprod Update 21:593-615
Tanwar, Pradeep S; Mohapatra, Gayatry; Chiang, Sarah et al. (2014) Loss of LKB1 and PTEN tumor suppressor genes in the ovarian surface epithelium induces papillary serous ovarian cancer. Carcinogenesis 35:546-53
Park, Joo Hyun; Tanaka, Yoshihiro; Arango, Nelson A et al. (2014) Induction of WNT inhibitory factor 1 expression by Müllerian inhibiting substance/antiMullerian hormone in the Müllerian duct mesenchyme is linked to Müllerian duct regression. Dev Biol 386:227-36
Patterson, Amanda L; Zhang, Ling; Arango, Nelson A et al. (2013) Mesenchymal-to-epithelial transition contributes to endometrial regeneration following natural and artificial decidualization. Stem Cells Dev 22:964-74