Tetsuya Hirata

ObjectivesTo evaluate the in vivo effect of dienogest on proliferation, apoptosis, aromatase expression, vascular density, nerve growth factor (NGF) expression and nerve fiber density in human adenomyosis tissue.Study designTwelve women who…

Drospirenone has been used as a progestin in oral contraceptives with ethinyl estradiol (DRSP/EE) and is expected to regulate endometriosis, however, the direct effects of drospirenone on endometriosis have not been clarified. The aim of th…

CONTEXT: Endometriosis is an estrogen-dependent, chronic inflammatory disease. Recent studies have shown that vitamin D (VD) is an effective modulator of the immune system and plays an important role in controlling many inflammatory disease…

PROBLEM: Neutrophils are known to be accumulated in endometriosis; however, direct evidence of the impact of neutrophils in the development of endometriosis was lacking. To clarify the importance of neutrophils, we examined the effect of ne…

PROBLEM: Resistance to apoptosis, together with inflammatory and invasive activity, contributes to the pathogenesis of endometriosis; therefore, approaches that can safely enhance apoptosis in endometriotic tissue are highly sought after as…

Endometriosis is recognized as an inflammatory disease in which inflammatory cytokines, such as interleukin (IL)-1β and TNFα, play important roles. Immunological factors are also suggested to be involved in the pathogenesis of endometriosis…

PurposeHypothyroidism is known to have a negative impact on female reproduction even in subclinical form, subclinical hypothyroidism (SH). This study aimed to investigate the association between elevated TSH level and reproductive outcome.M…

ObjectiveTo investigate the in vitro effect of drospirenone on human eutopic endometrial (EuSC) and ectopic endometriotic stromal cells (EcSC).DesignComparative and laboratory study. The experimental procedures were approved by the Institut…

STUDY OBJECTIVES: To evaluate the frequency of pneumothorax after laparoscopic surgery and to identify possible correlations to endometriosis. DESIGN: Retrospective review. SETTING: Tokyo University Hospital between 2006 and 2013. PATIEN…

PurposeTo evaluate whether laparoscopic excision of endometrioma exerts a qualitative effect on ovarian function.MethodsA retrospective analysis of oocytes retrieved in 25 cycles of 21 patients undergoing IVF treatment with controlled ovari…

PROBLEM: The proportion of CD4+ T lymphocytes, Th1, Th2, Th17, and regulatory T cells in endometriosis lesions and peripheral blood are not known. METHOD OF STUDY: Lymphocytes were isolated from endometriosis lesions (n = 10) and endometriu…

Objective: To evaluate the relative difficulty of laparoscopic hysterectomy (LH) for adenomyosis by categorizing them into four subtypes.Methods: We retrospectively collected 56 cases of adenomyosis treated by laparoscopy at our hospital fr…

Dienogest is a novel progestin that is highly selective for progesterone receptors and inhibits endometriosis. However, it remains unknown how the administration of dienogest to patients with endometriosis impacts on their lesion tissues. T…

Adenomyosis is a common disorder in premenopausal women that causes dysmenorrhea, pelvic pain and menorrhagia. Considering that adenomyosis is an estrogen-dependent disease, the medical treatment is based on this hormone. Effective and well…

PROBLEM: Immune tolerance to endometriotic cells is important to promote endometriosis. Tryptophan 2,3-dioxygenase (TDO) enhances immune tolerance by catabolizing tryptophan to kynurenine. We studied whether interleukin-1β (IL-1β), a typica…

CONTEXT: Endometriosis is a chronic inflammatory disease in which immune response and production of estrogen in endometriotic tissues are involved in the development of the disease. Prostaglandin E2 (PGE2) stimulates aromatase (P450arom) ex…