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Published on: May 23, 2014
Expression of beta 1 integrins in human endometrial stromal and decidual cells
S Shiokawa1, Y Yoshimura, S Nagamatsu
1Department of Obstetrics and Gynecology, Kyorin University School of Medicine, Tokyo, Japan.
Insights
Beta1 integrins are expressed on human endometrial and decidual cells, with expression varying across the menstrual cycle. These integrins are crucial for embryo implantation and extracellular matrix organization.
Area of Science:
- Reproductive biology
- Cell biology
- Integrin signaling
Background:
- Integrins are cell surface receptors mediating cell-extracellular matrix and cell-cell interactions.
- Beta1 integrins play critical roles in cell adhesion, migration, and differentiation.
- Understanding integrin expression in the human endometrium and decidua is vital for comprehending implantation processes.
Purpose of the Study:
- To investigate the expression and localization of beta1 integrin subunits in human endometrium and decidua.
- To determine the influence of ovarian hormones (estradiol and progesterone) on beta1 integrin expression in endometrial stromal cells.
- To explore the role of beta1 integrins in the context of early embryo implantation.
Main Methods:
- Flow cytometry to quantify beta1 integrin subunit expression on cultured endometrial stromal and decidual cells.
- Immunohistochemistry to assess the spatial distribution of beta1 integrins in endometrial and decidual tissues.
- Hormone treatment (estradiol and progesterone) of cultured stromal cells to evaluate their effects on integrin expression.
- Immunoprecipitation and SDS-PAGE to identify specific beta1 integrin subunits and their molecular weights.
Main Results:
- Beta1 integrin subunits (alpha1, alpha2, alpha5) were upregulated in mid-secretory phase endometrial stromal cells compared to early proliferative phase cells.
- Estradiol and progesterone increased beta1 integrin expression in cultured early proliferative phase stromal cells.
- Immunohistochemistry revealed distinct patterns of beta1 integrin staining in glandular epithelium and mesenchymal cells throughout the menstrual cycle.
- Decidual cells, including prolactin-producing cells, exhibited high levels of beta1 integrin expression.
- Specific beta1 integrin subunits (beta1, alpha1, alpha2) were identified with distinct molecular weights.
Conclusions:
- Human endometrial stromal and decidual cells express beta1 integrin subunits on their surface.
- Beta1 integrin expression is dynamically regulated during the menstrual cycle, peaking in the secretory phase and remaining high in the decidua.
- These findings suggest that beta1 integrins are important for mediating extracellular matrix organization during early human embryo implantation.
Abstract:
The present study was undertaken to investigate the expression of beta1 integrins in human endometrium and decidua using flow cytometry, immunohistochemistry, and immunoprecipitation. Fluorescence-activated flow cytometry demonstrated the greater expression of the beta 1, alpha 1, alpha 2, and alpha 5 subunits of the beta1 integrin family in cultured stromal cells from the midsecretory phase, than in those of the early proliferative phase. The addition of estradiol (E2) and progesterone (P) to cultured stromal cells in the early proliferative phase increased the expression of beta1 integrins in vitro. The immunohistochemical distribution of beta1 integrins demonstrated predominantly glandular epithelial staining in the proliferative phase, and mesenchymal and glandular staining in the midsecretory phase. Flow cytometry also demonstrated the expression of the beta 1, alpha 1, alpha 2, alpha 3, alpha 5, and alpha 6 subunits of beta 1 integrin family in cultured decidual cells, and the enriched-fraction of prolactin (PRL)-producing decidual cells isolated by Percoll gradients showed high levels of beta 1, integrins expression. Immunohistochemistry confirmed the beta 1 integrin cell surface phenotypes in cultured decidual cells observed by flow cytometry. Autoradiography of immunoprecipitate subjects to SDS-PAGE revealed three major polypeptides with molecular weights of 130 kDa (beta 1 subunit), 165 kDa (alpha 2 subunit), and 210 kDa (alpha 1 subunit) under reducing conditions. In summary, the present study demonstrated that endometrial stromal and decidual cells expressed beta1 integrin subunits at their surfaces. The expression exhibited a variability throughout the menstrual cycles, being predominantly detected in the secretory phase, and was maintained highly in the decidua. Thus, beta 1 integrins in human endometrium and decidua may be important in mediating the organization of extracellular matrix proteins derived from embryos during the early stage of implantation.
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