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Cytokine expression in human endometrium throughout the menstrual cycle
1Department of Pathology, University of South Florida Health Sciences Center, Tampa 33612.
Insights
Cytokines like interleukin-1 and transforming growth factor-alpha are present in the human endometrium throughout the menstrual cycle. Their abundant expression suggests key roles in endometrial cell interactions and functions.
Area of Science:
- Reproductive Biology
- Immunology
- Cell Biology
Background:
- Endometrial functions are increasingly understood to be regulated by cytokines.
- Cytokines are signaling proteins crucial for cell communication and immune responses.
Purpose of the Study:
- To investigate the presence and localization of specific cytokine proteins and mRNA in the human endometrium.
- To determine the expression patterns of these cytokines throughout the menstrual cycle.
Main Methods:
- Immunohistochemical staining was used to detect cytokine proteins.
- Reverse transcription-polymerase chain reaction (RT-PCR) was employed to identify cytokine mRNA.
- Human endometrial tissue samples collected across the menstrual cycle were analyzed.
Main Results:
- Proteins for interleukin-1 alpha, interleukin-1 beta, interleukin receptor antagonist (IRAP), interleukin-6 (IL-6), and transforming growth factor (TGF)-alpha were detected.
- IL-1 alpha and TGF-alpha showed strong expression in both stromal and epithelial cells.
- IL-6 was predominantly expressed in the endometrial epithelium, while IRAP was found in macrophages.
Conclusions:
- Cytokines are abundantly expressed in the human endometrium.
- These findings highlight the significant role of cytokines in regulating endometrial cell-cell interactions and overall function.
- Dynamic expression patterns, such as IL-1 alpha localization changes, suggest menstrual cycle-dependent regulation.
Abstract:
Recent evidence suggests that diverse endometrial functions may be regulated by cytokines. In this report, the presence of protein and mRNA of cytokines were studied in human endometrium throughout the menstrual cycle. The presence of the interleukin-1 (IL-1) alpha, interleukin-1 (IL-1) beta, interleukin receptor antagonist (IRAP), interleukin-6 (IL-6) and transforming growth factor (TGF)-alpha proteins were demonstrated by immunohistochemical staining. The IL-1 alpha and TGF-alpha proteins were strongly expressed and IL-1 beta protein was weakly expressed in all the cells in the stroma as well as epithelial cells. IRAP was markedly expressed in the cells with morphological features of macrophages scattered in the stroma, and the expression of IL-6 protein was predominant in the endometrial epithelium. Diffuse cytoplasmic expression of IL-1 alpha in endometrial epithelium during the proliferative phase contrasted markedly with its enhanced luminal expression during the secretory phase of the menstrual cycle. In addition, the presence of the mRNA of these cytokines in endometrium was established throughout the entire menstrual cycle by reverse transcription-polymerase chain reaction (RT-PCR). Abundant expression of cytokines in human endometrium emphasizes the significant roles that cytokines play in cell-cell interactions and in regulating endometrial functions.