Association between vitamin D and endometriosis among American women: National Health and Nutrition Examination Survey.

Endometriosis is a multifactorial disease associated with inflammation. Vitamin D has anti-inflammatory, antiproliferative, anti-oxidative, and immunomodulatory effects. Whether vitamin D levels are correlated with endometriosis is a subject of ongoing debate. This study aimed to examine the association between endometriosis and serum vitamin D levels. From the National Health and Nutrition Examination Survey, this study examined the cross-sectional data of American women aged 20-54 years from 2001 to 2006. After adjusting for covariates, multivariable logistic regression analysis was used to assess correlations. A total of 3,232 women were included in this study. The multiple linear regression model demonstrated a negative correlation between the serum 25-hydroxyvitamin D3 (cholecalciferol) concentration and the risk of endometriosis after controlling for all confounding variables. The odds ratio was 0.73 with a 95% confidence interval of 0.54-0.97 in the adequate vitamin D level group compared with the insufficient vitamin D level group. Our results showed that endometriosis was inversely correlated with serum 25-hydroxyvitamin D3 levels. Further research is needed to establish a causal relationship and determine the potential benefits of maintaining sufficient vitamin D levels for endometriosis prevention.

Melatonin-pretreated human umbilical cord mesenchymal stem cells improved endometrium regeneration and fertility recovery through macrophage immunomodulation in rats with intrauterine adhesions†.

Intrauterine adhesions (IUA) are a common gynecological problem. Stem cell therapy has been widely used in the treatment of IUA. However, due to the complex and harsh microenvironment of the uterine cavity, the effectiveness of such therapy is greatly inhibited. This study aimed to investigate whether melatonin pretreatment enhances the efficacy of human umbilical cord mesenchymal stem cells (HucMSCs) in IUA treatment in rats. First, we explored the effect of melatonin on the biological activity of HucMSCs in vitro through a macrophage co-culture system, Cell Counting Kit 8 (CCK-8), 5-Ethynyl-2'-deoxyuridine (EdU), flow cytometry, immunofluorescence staining, and qRT-PCR. Subsequently, we established the IUA rat model and tracked the distribution of HucMSCs in this model. In addition, we observed the number of M1 and M2 macrophages through immunofluorescence staining and detected the levels of inflammatory cytokines. Four weeks after cell transplantation, HE, Masson, and immunohistochemical staining were performed. In vitro experiments showed that melatonin pretreatment of HucMSCs promoted proliferation, reduced apoptosis, up-regulated the stemness gene, and regulated macrophage polarization. In vivo, melatonin pretreatment caused more HucMSCs to remain in the uterine cavity. Melatonin-pretreated HucMSCs recruited more macrophages, regulated macrophage polarization, and reduced inflammation. Melatonin-pretreated HucMSCs relieved fibrosis, increased endometrium thickness, and up-regulated CD34, vimentin, proliferating cell nuclear antigen (PCNA), and alpha small muscle antigen (α-SMA) expression. Fertility tests showed that melatonin-pretreated HucMSCs increased the number of embryos. In summary, pretreatment with melatonin was beneficial for HucMSC treatment because it enhanced the cell's ability to recruit macrophages and regulate macrophage polarization, which led to the regeneration of the endometrium and improved pregnancy outcomes.

Aquaporin 9 causes recurrent spontaneous abortion by inhibiting trophoblast cell epithelial-mesenchymal transformation and invasion through the PI3K/AKT pathway†.

BACKGROUND: Invasion of the endometrium by trophoblast cells is a key event during pregnancy, although the underlying mechanism remains unclear. Aquaporin 9 (AQP 9) is expressed in many eukaryotes and is associated with cell invasion. The objective of this study was to evaluate the significance of AQP9 in recurrent spontaneous abortion. METHODS: We screened the GSE22490 dataset and further differentiated aquaporin 9 expression in villi. AQP9 was evaluated as one of the key factors in abortion by injecting AQP9 overexpressed plasmid into the uterus of CD1 mice. Trophoblast cells were transfected with AQP9-overexpressing plasmid or siAQP9 to measure cell proliferation, migration, invasion, and apoptosis. Western blot was used to measure changes in the expression of invasion, epithelial-mesenchymal transformation process, and PI3K/AKT pathway. Finally, the role of AQP9 in PI3K/AKT signaling pathway was determined using the PI3K/AKT inhibitor, LY294002, and activator, 740Y-P. RESULTS: AQP9 is highly expressed in recurrent spontaneous abortion villus. Intrauterine injections of AQP9-overexpressing plasmid into CD1 mice resulted in atrophy and blackness of the gestational sac and increased the absorption rate, it is the causative factor of abortion. AQP9 upregulation inhibited the proliferation, invasion, migration, and epithelial-mesenchymal transformation process in vitro of trophoblast cells and increased cell apoptosis. The opposite result was observed after silencing AQP9. AQP9 overexpression also inhibited the PI3K/AKT pathway. LY294002 and 740Y-P partially recovered AQP9-induced trophoblast invasion and migration via the PI3K/AKT pathway. CONCLUSIONS: AQP9 reduces the invasive ability of trophoblast cells by regulating PI3K/AKT signaling pathway, participating in recurrent spontaneous abortion.

Combined oral antibiotics and intrauterine perfusion can improve in vitro fertilization and embryo transfer pregnancy outcomes in patients with chronic endometritis and repeated embryo implantation failure.

BACKGROUND: The aim of this retrospective study was to investigate whether oral antibiotics (doxycycline and metronidazole) combined with intrauterine perfusion (gentamicin and dexamethasone) are beneficial for patients with repeated implantation failure (RIF) and chronic endometritis (CE) to improve clinical pregnancy outcomes. METHODS: Patients with RIF and CE were diagnosed using hysteroscopy and histology together. A total of 42 patients were enrolled in the study. All patients received oral antibiotics (doxycycline combined with metronidazole) and 22 patients underwent intrauterine perfusion (gentamicin combined with dexamethasone) immediately after the end of oral antibiotic therapy. Pregnancy outcomes were evaluated during the first in vitro fertilization (IVF) and embryo transfer (ET) cycle. RESULTS: For the first D3 ET after treatment with oral antibiotics (doxycycline and metronidazole) combined with intrauterine perfusion (gentamicin and dexamethasone), higher embryo implantation rate (30.95% vs. 26.67%, P = 0.0308), clinical pregnancy rate (30% vs. 50%, P < 0.001), live birth rate (33.33% vs. 45.45%, P < 0.0001). No fetal malformations or ectopic pregnancies were observed. CONCLUSION: We report oral antibiotics (doxycycline and metronidazole) combined with intrauterine perfusion (gentamicin and dexamethasone) as a novel treatment for CE to improve the outcomes of successful pregnancy compared with those of oral antibiotics alone.

Immunohistochemical expression of estrogen receptor α, Bcl-2 and NF-κB P65 in the polyps of patients with and without endometriosis.

AIM: To compare the expression of estrogen receptor α (ERα), Bcl-2 and NF-κB P65 in endometrial polyps from patients with and without endometriosis. METHODS: Immunohistochemistry was used to characterize the expression of ERα, Bcl-2 and NF-κB P65 in proliferative phase endometrial polyps from patients with and without endometriosis. H-Scores indicating the staining intensity for ERα, Bcl-2 and NF-κB P65 in the glandular epithelium and stroma were measured separately. Apoptotic cells were detected with the use of the dUTP nick-end labeling (TUNEL) assay. RESULTS: Bcl-2 was expressed in the cytoplasm of glandular epithelial cells, whereas ERα was expressed in the nuclei of both glandular epithelial and stromal cells. NF-κB P65 was observed in the cytoplasm of both glandular epithelial and stromal cells. The H-scores for Bcl-2 in the endometrial glands significantly higher in the endometriosis polyp group than in the non-endometriosis polyp group. The H-scores for ERα in both stromal and glandular epithelial cells were significantly higher in the endometriosis polyp group than in the non-endometriosis polyp group. The H-scores for Bcl-2 and ERα were positively correlated in all of the women examined. Apoptotic cells in the endometriosis polyp group were significantly less than that of the non-endometriosis polyp group. CONCLUSION: There expression levels of Bcl-2 and ERα, both of which were significantly increased in the polyps of endometriosis patients compared to those of patients without endometriosis, were positively correlated. These results suggested that imbalanced apoptosis secondary to abnormally high ERα expression was responsible for the high prevalence of polyps in endometriosis patients.

G-CSF-mobilized peripheral blood mononuclear cells combined with platelet-rich plasma accelerate restoration of ovarian function in cyclophosphamide-induced POI rats†.

Peripheral blood mononuclear cells (PBMCs) are rich in hematopoietic cells and mesenchymal stem cells. Platelet-rich plasma (PRP) is rich in various growth factors. PBMCs and PRP have been suggested, individually, to restore ovarian function by improving the local microenvironment. The current study investigated the effect of granulocyte colony-stimulating factor (G-CSF)-mobilized PBMCs combined with PRP on restoring ovarian function in rats with primary ovarian insufficiency (POI). Thirty adult female rats were randomly subdivided into five groups: normal control (control), cyclophosphamide (CTX) plus subsequent PBS (POI + PBS), CTX plus subsequent PRP (POI + PRP), CTX plus subsequent G-CSF-mobilized PBMCs (POI + PBMCs), and CTX plus subsequent G-CSF-mobilized PBMCs combined with PRP (POI + PBMCs + PRP). CTX exposure induced the typical POI phenotype with increased diestrus; shortened estrus; follicle arrest at all stages; decreased serum levels of estradiol-17ß (E2) and anti-Mullerian hormone (AMH); and increased levels of follicle-stimulating hormone (FSH). Transplantation of mobilized PBMCs with PRP resulted in a much earlier restoration of the estrous cycle, sex hormone levels, and preantral follicle growth in POI rats. Expression of the male-specific Sry gene in the ovarian tissues of POI + PBMCs + PRP female recipient rats was evident at 5, 10, and 20 days posttransplantation along with significant increases in the expression of angiogenesis markers CD34+ and VEGF and folliculogenesis markers AMH and FSHR. Additionally, PBMCs in combination with PRP mitigated granulosa cell apoptosis by downregulating BAX and upregulating BCL-2. These results demonstrate that G-CSF-mobilized PBMCs combined with PRP accelerate the restoration of ovarian function in POI rats by increasing ovarian neovascularization, reducing granulosa cell apoptosis, and promoting folliculogenesis.

Genetic diagnosis of ß-thalassemia preimplantation using short tandem repeats in human cryopreserved blastocysts.

This study aimed to evaluate the application of short tandem repeats (STRs) for the preimplantation genetic diagnosis (PGD) of ß-thalassemia. This was a prospective study performed at the Liuzhou Maternity and Child Healthcare Hospital. From May to December 2016, eight couples formed of two ß-thalassemia carriers underwent in vitro fertilization (IVF) procedures and PGD. All couples and four family members/couple underwent blood testing. Whole genome amplification of trophectoderm cells was performed. PCR products were used for linkage analysis of 15 STR loci. From the eight couples, 147 embryos were obtained and 86 blastocysts were formed. The DNA from 82 blastocysts was successfully amplified (amplification efficiency of 95.4%). Eighty blastocysts obtained a definite diagnosis. Among them, 24 blastocysts were diagnosed as normal, 38 blastocysts were diagnosed as heterozygous for ß-thalassemia, and 18 blastocysts were homozygous or compound heterozygous. Two patients received a thawed embryo and both had a clinical pregnancy. These results indicated that in the setting of PGD for ß-thalassemia, after multiple displacement amplifications, reverse dot hybridization combined with STRs could be an effective, accurate, and practical clinical strategy to improve the detection of ß-thalassemia in at-risk couples undergoing embryo transfer. These results have to be validated in a larger cohort.

DHEA improves the antioxidant capacity of endometrial stromal cells and improves endometrium receptivity via androgen receptor.

OBJECTIVE: To investigate the effect of dehydroepiandrosterone (DHEA) on mouse decidual endometrial stromal cells (ESCs) and to explore mechanisms regulating endometrial receptivity. STUDY DESIGN: Mouse ESCs were incubated with increasing concentrations of DHEA during decidualization. Treatment with flutamide (FLU), a specific androgen receptor (AR) antagonist, was also performed. Flow cytometry was used to measure intracellular reactive oxygen species (ROS). Real time-PCR was used to determine mRNA expression of decidual PRL-related protein (dPRP), AR, and HomeoboxA10 (HOXA10). Protein levels of AR and HOXA10 were measured by western blot. RESULTS: DHEA significantly inhibited ESC proliferation at concentrations ≥1×10(-6)M. DHEA treatment reduced intracellular ROS in a dose-dependent manner. Expression of dPRP was minimally affected by DHEA at concentrations of 1 to 100nM. However, DHEA (100nM) significantly increased the expression of HOXA10 at both the mRNA and protein levels (P<0.01). Importantly, this DHEA-mediated increase in HOXA10 was attenuated by treatment with FLU. Finally, neither DHEA nor FLU influenced expression of AR mRNA or protein. CONCLUSION: Low concentration of DHEA improves the antioxidant capacity of decidual ESCs. DHEA treatment may also improve endometrium receptivity via AR.