PubMed · 15705412
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Bruce A Lessey, Ryszard J Chetkowski. 2005. Detecting differences in endometrial maturation?. https://doi.org/10.1016/j.fertnstert.2004.11.013
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In order to become fully competent at fertilizing the oocyte, spermatozoa must undergo the maturational process of capacitation during their journey in the female reproductive tract. Endometrial cells secrete an array of growth factors that can affect spermatozoa. Among these factors, it has been previously demonstrated that interleukin-6 (IL-6) affects the fertilizing capacity of human spermatozoa. As the expression of this cytokine varies throughout the menstrual cycle and increases during the periovulatory period, the involvement of IL-6 in human sperm capacitation was investigated, with emphasis on the signal transduction cascade triggered by this agent in sperm cells. Spermatozoa were treated with recombinant human IL-6. Protein phosphotyrosine content and localization of the phosphotyrosine containing proteins were evaluated by western blot and indirect immunofluorescence, respectively, using a monoclonal anti-phosphotyrosine antibody. The acrosomal status was evaluated on IL-6 treated spermatozoa before or after challenge with the ionophore A23187 according to the fluorescent pattern observed upon binding to the Pisum sativum agglutinin conjugated to fluorescein isothiocyanate. In the present study, it is shown that, as for endometrial cell-conditioned media, IL-6 induces human sperm capacitation. The IL-6 effects most likely occur through binding to its receptor, IL-6Ralpha, whose presence in the sperm is also reported in this study. As for the IL-6 receptor, this is the first report on the presence of the tyrosine kinase JAK1 in the spermatozoa. Moreover, this kinase becomes phosphorylated on tyrosine residues upon sperm treatment with recombinant IL-6, which suggests its activation by the cytokine. Taken together, our results demonstrate that the IL-6 intracellular signalling machinery is present in human spermatozoa and might be involved in the acquisition of sperm fertilizing ability, also known as the capacitation process.
BACKGROUND: To estimate sensitivity and specificity of hysterosonography for diagnosis of endometrial cavity abnormalities. The gold-standard was hysteroscopy; to compare the agreement between ultrasonographic, hysterosonographic and hysteroscopic findings using the KIA (Kappa Index Agreement). METHODS: Fifty asymptomatic postmenopausal women that had a suspicion of endometrial abnormalities based upon transvaginal ultrasonography were studied. Hysterosonography, diagnostic hysteroscopy and oriented biopsy were performed and the Kia was used to compare results. RESULTS: The most frequent abnormalities were polyps (58%), synechiae (20%), submucous myoma (12%) and endometrial thickening (6%). The uterine cavity was considered normal in 4% of the evaluations by hysteroscopy. The sensitivity of hysterosonography to diagnose polyps was of 89.7%, the specificity of 81.0% and the KIA of 71.1%. For synechia sensitivity of hysterosonography was of 80%, specificity of 100% and the KIA of 86.5%; for submucous myoma sensitivity was of 83.3%; specificity of 97.7% and the KIA of 81.1%, and for endometrial thickening, sensitivity was of 33.3%, specificity of 89.4% and the KIA of 15.5%. CONCLUSION: Hysterosonography showed very good agreement with hysteroscopy for the diagnosis of synechiae and submucous myomas; good agreement for polyps and poor agreement for endometrial thickening. Based upon this data hysterosonography may be deemed a simple, efficient, and accurate method for the evaluation of the uterine cavity in the postmenopausal period.
OBJECTIVE: To investigate the expression of the type I interferon receptor (IFNAR) and interferon-induced Mx protein (Mx) in normal human endometrium throughout the menstrual cycle. DESIGN: Prospective study. SETTING: Medical university in Japan. PATIENT(S): Thirty-seven normal endometrial tissues from fertile women who had undergone hysterectomies for reasons other than endometrial disease. INTERVENTION(S): IFNAR-1, IFNAR-2, MxA, and MxB gene expression was analyzed by reverse transcription-real-time quantitative polymerase chain reaction. Moreover, localization of IFNAR-1 and IFNAR-2 were studied by immunohistochemistry. MAIN OUTCOME MEASURE(S): Expression of IFNAR-1, IFNAR-2, MxA, and MxB. RESULT(S): Expression of IFNAR-2 gene was significantly increased in the menstrual and midsecretory phase as compared with in the proliferative phase. Immunohistochemistry for IFNAR-1 and IFNAR-2 revealed weak staining of glandular epithelium and weak staining of stromal cells during the proliferative phase. However, an intense immunohistochemical staining of IFNAR-2 was observed on the surface and basement membrane of glands in the secretory phase. There was no statistical difference between MxA and MxB gene expression throughout the menstrual cycle. CONCLUSION(S): Our results suggest that IFNAR and Mx are expressed in the human endometrium and that the expression of IFNAR is cyclically changed during the menstrual cycle.