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• W2886136458 abstract "Human mammary gland development and differentiation are tightly regulated by hormones, growth factors, and microenvironmental cues. Rodent models have been used to help gain knowledge about mammary gland biology, but there are significant structural and hormonal response differences between the human and rodent mammary glands. Moreover, cultured immortalized human mammary cell lines have been widely used for in vitro experiments to study epithelial cell biology, but it has been questioned whether they faithfully recapitulate normal breast cells. Conditional reprogramming has recently emerged as an efficient method to induce rapid and inexhaustible in vitro proliferation of primary epithelial cells from normal and malignant tissues in two-dimensional (2D) culture conditions. However, studies using this method have not shown whether conditionally reprogrammed mammary epithelial cells can form defined structures in three-dimensional (3D) culture conditions. Therefore, our goal is to develop an appropriate in vitro model using conditional reprogramming to study human mammary cell and tissue function under 2D and 3D culture conditions. We cultured primary human mammary cells from normal prophylactic tissues or breast tumors using this method. Cell type heterogeneity, cellular marker expression, and structural arrangement were examined using immunofluorescence staining. We found that normal breast cells grown under this culture condition exhibited morphologic features of luminal cells (CK18, desmoglein 3, and CK19) and myoepithelial cells (vimentin, p63, and CK14), indicating maintenance of in vivo heterogeneity. CD49f and EpCAM double staining is commonly used to separate luminal, basal, and progenitor populations. Immunofluorescence and FACS analysis further revealed subpopulations with varying CD49f and EpCAM expression profiles in the normal primary cultures, as well as detectable expression of ERα in earlier passages. Treatment with estradiol also stimulated cellular proliferation as detected by positive EdU staining. When grown in Matrigel/Collagen I gel, normal primary cells self-organize into two distinct 3D structures that are composed of densely packed cells or a spherical structure containing a lumen, which express either luminal or myoepithelial cell markers, respectively. CK8-positive luminal cells that form the lumen can differentiate into milk-producing cells in the presence of a prolactogenic growth condition. Tumor cells extracted from breast cancer patients showed expression for either basal (CK18 and FOXC1) or luminal (CK14 and ER-positive) markers in 2D cultures. Our ongoing work entails delineating the long-term culture effect on primary mammary cell fate and function and the tumorigenic property of primary breast tumor cells. The current findings uncover an in vitro model that may be a valuable tool to study mammary cell function and can potentially be used to elucidate mechanisms involved in mammary tumorigenesis. Citation Format: Stacey Chung, Liting Jin, Ying Qu, Liliana J. Gomez, Bingchen Han, Bowen Gao, Xuefeng Liu, Farin Amersi, Catherine Dang, Armando E. Giuliano, Xiaojiang Cui. Assessment of conditional reprogramming to generate 2D and 3D primary human mammary cell culture models [abstract]. In: Proceedings of the AACR Special Conference: Advances in Breast Cancer Research; 2017 Oct 7-10; Hollywood, CA. Philadelphia (PA): AACR; Mol Cancer Res 2018;16(8_Suppl):Abstract nr A59." @default.
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• W2886136458 date "2018-08-01" @default.
• W2886136458 modified "2023-09-27" @default.
• W2886136458 title "Abstract A59: Assessment of conditional reprogramming to generate 2D and 3D primary human mammary cell culture models" @default.
• W2886136458 doi "https://doi.org/10.1158/1557-3125.advbc17-a59" @default.
• W2886136458 hasPublicationYear "2018" @default.
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