Establishment and Characterization of a Stromal Cell Line Derived From a Patient With Thoracic Endometriosis

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Researchers established and characterized the TH-EM1 cell line from thoracic endometriosis implants, finding it expresses mesenchymal and embryonic markers, has chromosomal gains, and its growth is inhibited by medroxyprogesterone acetate.

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The study established and characterized TH-EM1, a spontaneously growing stromal-like cell line derived from lung parenchymal endometriotic implants from a single patient with thoracic endometriosis. Cells grew long-term with a 5–6 day doubling time, and treatment with medroxyprogesterone acetate inhibited proliferation and induced morphological changes toward epithelial-like features; immunohistochemistry and flow cytometry showed expression of nuclear estrogen and progesterone receptors and erythropoietin receptor, along with CD9/CD13/CD73/CD90/CD105/CD157. The cells also expressed embryonic/pluripotency-associated markers SOX-2 and Nanog in a subset and fetal hemoglobin/α-globin in a substantial fraction, and cytogenetic analyses revealed normal metaphases with specific DNA copy-number gains. A major limitation is that the model is derived from one thoracic endometriosis patient and the characterization is largely phenotypic/genomic rather than functional across broader patient cohorts. This paper is centrally about endometriosis—specifically thoracic endometriosis—by creating an ex vivo stromal cell line from lung endometriotic implants.

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Abstract

Thoracic endometriosis (TE) syndrome is a clinical condition known as an extrapelvic form of endometriosis with the presence of functioning endometrial tissue involving lung parenchyma, pleura, chest wall, or diaphragm. In an effort to obtain an endometriosis ex vivo model, we established the spontaneously growing TH-EM1 cell line from endometriotic implants in lung parenchyma from a woman with TE. Maintained in long-term culture, the cells grew as large mesenchymal-like cells with a doubling time between 5 and 6 days. Treatment with medroxyprogesterone acetate (10–7 mol/L) inhibited the TH-EM1 cells growth and induced morphological changes to an epithelial-like cells. Strong expression of the nuclear estrogen receptors, progesterone receptors, and erytropoietin receptors were found in both the pulmonary implant and the TH-EM1 cells by immunohistochemical analysis. Consistent immunoreactivity of TH-EM1 cells for CD9, CD13, CD73, CD90, CD105, and CD157 was revealed by flow cytometry. Likewise, the embryonic markers, SRY-box 2 (SOX-2) and the Nanog molecules, were detected in 76% and 52% of the cells, while fetal hemoglobin and a-globin were detected in 76% and 65% of TH-EM1 cells, respectively. By RHG banding, normal metaphases were observed, while the microarray chromosomal analysis showed gains of DNA sequences located on the segments 8p23.1, 11p15.5, and 12p11.23. The described in vitro cellular model can serve as a useful tool to study the pathogenesis of endometriosis and to improve the knowledge of molecular mechanisms controlling the endometriotic cell dissemination potential. Similar content being viewed by others

References

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endometriosisthoracic_endometriosis

MeSH descriptors

Endometriosis Endometriosis Endometrium Stromal Cells Thoracic Diseases Thoracic Diseases Adult Cell Culture Techniques Cell Culture Techniques Cell Proliferation Cell Proliferation Diaphragm Diaphragm Diaphragm Endometriosis Endometriosis Endometrium Endometrium Female Humans

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