Publications by authors named "Takuya Ayabe"

Aim: As a treatment for tubal infertility, falloposcopic tuboplasty (FT) is one of the options for patients who wish to conceive naturally. Based on the results of FT, we propose an appropriate time of transitioning to assisted reproductive technology (ART) for tubal infertility.

Objects And Methods: We examined the outcomes of cases of tubal infertility during the period from June 1999 through March 2021 who were performed tuboplasty at our hospital using the FT catheter system under laparoscopy.

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Ulipristal acetate (UPA), a selective progesterone receptor modulator, is used for the treatment of uterine fibroids and selectively inhibits the proliferation and inflammation of leiomyoma cells. As few studies have focused on the molecular biological mechanism of UPA in Ishikawa endometrial cancer cells, we aimed to identify the effects of UPA on these cells. Ishikawa cells were treated with different concentrations of UPA.

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Conventional human pluripotent stem cells (hPSCs), known for being in a primed state, are pivotal for both basic research and clinical applications since such cells produce various types of differentiated cells. Recent reports on PSCs shed light on the pluripotent hierarchy of stem cells and have promoted the exploration of new stem cell states along with their culture systems. Human naïve PSCs are expected to provide further knowledge of early developmental mechanisms and improvements for differentiation programmes in the regenerative therapy of conventionally primed PSCs.

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Article Synopsis
  • Cancer stem cells (CSCs) exist in a special environment with other cells and structures that support their growth, playing a key role in tumor development and spread.
  • This study aims to create a reliable method to explore how ovarian cancer stem cells (OCSCs) can initiate tumors.
  • The researchers used an in vitro model to observe how OCSCs interact with endothelial cells and how these interactions lead to new blood vessel formation, shedding light on the role of OCSCs in cancer progression.
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  • * In mouse models, DS-3032b reduced tumor volumes in clear cell ovarian and renal carcinomas, while DS-5272 improved survival by inhibiting ascites production and reducing tumor burden.
  • * Combining MDM2 inhibitors with everolimus showed promising results in enhancing treatment efficacy and reducing required doses, suggesting further research is needed to evaluate this dual therapy approach for clear cell carcinoma patients.
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Development of liver diseases during pregnancy is not uncommon. They are caused by either a disorder that is unique to pregnancy or an acute or chronic liver disease that already exists or coincidentally develops as a comorbidity of pregnancy. Liver diseases unique to pregnancy include hyperemesis gravidarum; hypertensive disorders of pregnancy, such as pre-eclampsia/eclampsia; hemolysis, elevated liver enzymes, and low platelet count syndrome; intrahepatic cholestasis of pregnancy; and acute fatty liver of pregnancy.

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  • Tamoxifen (TAM) treatment can lead to ovarian hyperstimulation (OHS) in premenopausal women with breast cancer, notably associated with high estradiol levels.
  • A study categorized patients into four groups based on their treatment history and found significant differences in the incidence of OHS among them.
  • Results showed that younger patients and those post-chemotherapy had a higher risk of OHS, emphasizing the need for combined treatment strategies to manage this risk effectively.
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Rikkunshito, a traditional Japanese herbal medicine, improves appetite via activation of gastrointestinal hormone ghrelin pathway. The function of ghrelin is mediated by growth hormone secretagogue receptor (GHSR1a), and ghrelin has been known to possess diverse physiological functions including growth suppression of some cancer cells. Considering that increased ghrelin signaling by Rikkunshito could enhance sirtuin1 (SIRT1) activity in nervous system, we aimed to investigate the effect of Rikkunshito in ovarian cancer cells.

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While the incidence of endometrial cancer continues to rise, the therapeutic options remain limited for advanced or recurrent cases, and most cases are resistant to therapy. The anti-tumor effect of many chemotherapeutic drugs and radiotherapy depends on the induction of DNA damage in cancer cells; thus, activation of DNA damage response (DDR) pathways is considered an important factor affecting resistance to therapy. When some DDR pathways are inactivated, inhibition of other DDR pathways can induce cancer-specific synthetic lethality.

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  • The ubiquitin-proteasome pathway is crucial for regulating cellular proteins, and recent studies are identifying deubiquitinating enzymes (DUBs) as new targets for cancer therapies, especially in breast, endometrial, and prostate cancers, as well as multiple myeloma.
  • Research shows that the DUB inhibitor bAP15 can inhibit cell growth in various cancers; however, its mechanism in ovarian cancer is still not fully understood.
  • In a study involving 1,435 ovarian cancer patients, high UCHL5 expression was linked to shorter progression-free survival, and bAP15 was found to induce cancer cell death by affecting TGF-β signaling, suggesting UCHL5 inhibition could be a promising
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Several specific tests for cervical screening have been developed recently, including p16/Ki67 dual immunostaining for diagnosing high-risk human papillomavirus positive squamous intraepithelial lesion in the cervix. However, manual screening of cells in an entire glass slide is currently a standard clinical procedure for quantification and interpretation of immunocytochemical features of the cells. Here, we developed a microfluidic device containing an electroactive microwell array with barriers (EMAB) for highly efficient single-cell trapping followed by on-chip immunofluorescence analysis with minimum loss of the sample.

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Article Synopsis
  • - Stratified mucin-producing intraepithelial lesion (SMILE) is a rare precursor to cervical adenocarcinoma, linked to human papillomavirus (HPV), yet limited data exists on HPV detection within SMILE lesions.
  • - A 30-year-old woman's Pap smear showed atypical glandular cells, and subsequent biopsy confirmed the presence of SMILE and high-grade squamous intraepithelial lesion (HSIL), with HPV types 52 and 68 detected as contributing factors.
  • - Identifying high-risk HPV genotypes could be crucial for preventing SMILE progression to cancer and improving patient management strategies.
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Background: Patients with lymph node metastasis-negative (pN0) invasive breast cancer have favorable outcomes following initial treatment. However, false negatives which occur during routine histologic examination of lymph nodes are reported to underestimate the clinical stage of disease. To identify a high-risk group in pN0 invasive breast cancer, we examined copy number alterations (CNAs) of 800 cancer-related genes.

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Protein expression in human umbilical vein endothelial cells (HUVECs) is a useful indicator of maternal condition and the intrauterine environment during pregnancy. Therefore, we investigated protein expression in HUVECs obtained from patients with gestational diabetes mellitus (GDM). HUVECs were prepared from the umbilical cords of GDM patients and controls who underwent planned cesarean section between 2013 and 2014 at Teikyo University Hospital (Tokyo, Japan).

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This is the first reported case of descent of the placental marginal sinus through the cervix to the external os. We think marginal sinus rupture does exist. The definition of placental edge should be the parenchyma in diagnosis of low-lying placentation.

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Background: A previous report showed that a glucagon-like peptide-1 receptor (GLP-1R) agonist (exenatide) induced apoptosis in endometrial cancer cells. However, the pathophysiological role of GLP-1R in endometrial cancer has not been fully elucidated. Here, we investigated the effects of the GLP-1R agonist liraglutide in endometrial cancer cells and examined the association between GLP-1R expression and clinicopathological characteristics in endometrial cancer patients.

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Purpose: To investigate changes in uterine flexion after cesarean delivery in comparison with vaginal delivery, and their relationship with the presence of deficient cesarean section scars.

Methods: In 147 women who had a vaginal delivery and 101 women who had a cesarean delivery, transvaginal ultrasonographic photographs of the uterus were obtained at the first trimester of pregnancy and at 1 month postpartum, and they were reviewed to determine changes in uterine flexion. The presence of a deficient cesarean section scar was also reviewed in women with a cesarean section.

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Background: Recent Drosophila studies showed that Discs-large (Dlg) is critical for regulation of cell polarity and tissue architecture. We investigated the possibility that loss of the human homologue of Drosophila Dlg (DLG1) is involved in endometrial carcinogenesis.

Methods: We analysed DLG1 expression in 160 endometrial cancers by immunohistochemical staining.

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Minimal deviation adenocarcinoma (MDA) is defined as an extremely well differentiated variant of endocervical adenocarcinoma. Several reports have stated that MDA associates with lobular endocervical glandular hyperplasia (LEGH). It is difficult to distinguish LEGH from MDA based on clinical and histologic similarities.

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Spinal cord infarction (SCI) is uncommon as compared to cerebral stroke. Moreover, SCI during pregnancy is rare. Here, we report a case of SCI in diabetic pregnancy, properly diagnosed, promptly treated, and a good prognosis achieved.

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Objective: To evaluate the usefulness of intraoperative ultrasonography (IU) in reducing the number of unnecessary para-aortic lymphadenectomy in women with endometrial carcinoma.

Methods: Computed tomography (CT) and IU were used to assess whether para-aortic lymph nodes were enlarged in 91 women with endometrial carcinoma. All women underwent hysterectomy and systematic pelvic and para-aortic lymphadenectomy.

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We report here a 35-year-old pregnant woman with acute myelogenous leukemia (AML). She was diagnosed with AML (M2) in August 2009, coinciding with the 26(th) week of pregnancy. She underwent a cesarean section at 27 weeks gestation, delivering a very low birth weight male infant (1,066 g).

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Aim: To determine whether concurrent chemoradiotherapy (CCRT) can improve the survival rate of high-risk uterine cervical cancer.

Material & Methods: We analyzed 16 cases of uterine cervical cancer that had undergone radical hysterectomy and pelvic lymphadenectomy from 2003 to 2008. The patients were eligible if they had histologically confirmed positive parametrial involvement, positive pelvic lymph nodes or non-squamous cell carcinoma.

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Toxic epidermal necrolysis (TEN) is a very rare drug reaction associated with a high mortality rate. This condition warrants prompt recognition, diagnosis and treatment. Only one case report of TEN that was possibly induced by ritodrine hydrochloride, a tocolytic agent, was found in English literature.

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