Masashi Takamura

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…

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…

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…

Although surgical excision of endometriosis both improves pain and enhances fertility, recurrence can further exacerbate pain and reduce fertility, which in turn impacts the quality of life and increases personal as well as social costs. Th…

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 endometri…

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…

OBJECTIVE: To investigate a new role of interleukin (IL)-17A in endometriosis. DESIGN: Laboratory study. SETTING: University hospital. PATIENT(S): Patients with ovarian endometrioma undergoing laparoscopy or laparotomy. INTERVENTION(S):…

STUDY QUESTION: Is thymic stromal lymphopoietin (TSLP) involved in the pathophysiology of endometriosis? SUMMARY ANSWER: TSLP is up-regulated by interleukin (IL)-1β and may be involved in the development of endometriosis. WHAT IS KNOWN AL…

Laparoscopic excision is considered as the 'gold standard' treatment of ovarian endometrioma. However, a frustrating aspect is that disease can recur. While laparoscopic excision is known to improve fertility, recurrence can cause significa…

Extragenital endometriosis severely impairs the quality of life for affected women but its standard management has not yet been well established because of its relatively low incidence. As extragenital organs, intestine, followed by urinary…

OBJECTIVE: To examine the effects of interleukin (IL)-17F on the secretion of IL-8 and the gene expression of cyclooxygenase 2 (COX2) in endometriotic stromal cells. DESIGN: In vitro experimental study using human samples. SETTING: Univer…

BACKGROUND: Proteinase-activated receptor 2 (PAR2) is a G-protein-coupled receptor that is activated by several serine proteases. PAR2 activation in endometriotic stromal cells (ESCs) has been implicated in the development of endometriosis …

In an animal endometriosis model, the administration of hyaluronic acid (HA) reagent significantly suppressed the formation of endometriotic lesions in both number and weight. This effect was found when HA treatment was conducted at the tim…