Prostaglandin E2 plays an important role in carcinogenesis and malignant potential of prostate cancer (PC) cells by binding to its specific receptors, E-type prostanoid (EP) receptors. However, anti-carcinogenic effects of the EP receptor antagonist are unclear. In this study, we used a mouse model of PC. The mice were provided standard feed (control) or feed containing the EP1 receptor antagonist and were sacrificed at 10, 15, 30, and 52 weeks of age. Apoptosis was evaluated by immunohistochemical analysis using a cleaved caspase-3 assay. The incidence of cancer in the experimental group was significantly lower than that in the control group at 15, 30, and 52 weeks of age. The percentage of poorly differentiated PC cells was significantly lower in the experimental group than in the control group at 30 and 52 weeks of age. The percentage of apoptotic cells in the experimental group was significantly higher than that in the control group at 15, 30, and 52 weeks of age. These findings indicate that feeding with the addition of EP1 receptor antagonist delayed PC progression via the upregulation of apoptosis. We suggest that the EP1 receptor antagonist may be a novel chemopreventive agent for PC.

Background/Aim: In clinical practice, constipation is one of the most frequent adverse events caused by drugs for overactive bladder (OAB). The occurrence of constipation greatly deteriorates the patient's quality of life. The aim of the study was to evaluate and compare the effects of three commonly used β3 agonists and anticholinergic drugs on the defecation status in patients with OAB. Patients and Methods: We retrospectively reviewed the defecation status in patients who received mirabegron, solifenacin, or fesoterodine for OAB. We evaluated changes in the (a) urological parameters using the OAB symptom score (OABSS) and (b) defecation status using the Bristol Stool Form Scale (BSFS) and constipation scoring system (CSS) following 12 weeks of drug administration. Results: We analyzed data from 165 patients (mirabegron=56, fesoterodine=52, and solifenacin=57). The solifenacin group showed a significant decrease in BSFS (from 3.2±1.0 at baseline to 2.3±1.2 post-treatment) and an increase in hardened stools (p<0.001). Elimination worsened as assessed by almost all items, and the total modified CSS scores worsened significantly from 4.8±2.6 points at baseline to 8.0±4.8 points after 12 weeks of solifenacin treatment (p<0.001). The mirabegron group showed no changes in any of the CSS items. In the fesoterodine group, the CSS scores for "completeness" and "assistance" increased significantly after treatment (p<0.001 and p=0.013, respectively). Conclusion: All three drugs were effective for OAB. Mirabegron had almost no effect on constipation; fesoterodine, an anticholinergic drug, also had hardly any effect on defecation.Overactive bladder (OAB) is a symptom syndrome characterized by urinary urgency, with or without urgency incontinence (1). The prevalence of OAB increases with age, and some epidemiological surveys suggest it to be 16-19% (2, 3). β3-adrenergic receptor agonists and anticholinergic drugs are standard drug therapies for OAB worldwide. However, the persistence of drugs for OAB is lower than that of drugs for chronic diseases such as hypertension and diabetes (4). Furthermore, compared to β3-adrenergic receptor stimulants, anticholinergic drugs have a significantly lower continuation rate due to adverse events associated with them in the early phase of administration (5).The adverse events associated with anticholinergic drugs include dry mouth, constipation, dementia, and dysuria. Among them, constipation has the greatest effect on patient satisfaction (6). While there are several meta-analyses on the risk of constipation associated with β3 adrenergic receptor agonists and anticholinergic drugs (7, 8), there are no detailed studies on the changes in the defecation status before and after the administration of these drugs.This study aimed to examine the differences in defecation status before and after administration of β3 agonists and anticholinergic drugs using an established questionnaire. Patients and MethodsEthics. The study protocol was approved by the Clinical Study Review Board of the Nagasaki ...

Penile fracture is a rare urologic emergency, and its surgical treatment is selected based on the damaged site of the penile corpus cavernosum. Penile fractures at the site of the crus penis are quite rare, and there is controversy regarding the preferred method of surgical repair. Case presentation: A 25-year-old Asian man was injured when rolling over in bed. Magnetic resonance imaging showed a tear in the left crus of the penis with a hematoma. Delayed surgery was successfully performed using the transperineal approach. He did not experience pain, dysuria, or erectile dysfunction postoperatively. Conclusion: Delayed surgical repair using transperineal approach may be useful for penile fractures associated with penile crus injuries.

Prostaglandin E2 plays important roles in carcinogenesis and malignant potential of prostate cancer (PC) by binding to its specific receptors, E-type prostanoid (EP) receptors. However, anti-carcinogenic effects of EP receptor antagonist are not clear. In this study, feed with or without EP1 receptor antagonist were given to a mouse model of prostate cancer. The mice were sacrificed at 10, 15, 30, and 52 weeks of age. Apoptosis was evaluated by immunohistochemical analysis using cleaved caspase-3. The incidence of cancer in the experimental group was significantly lower than that in the control group at 15, 30, and 52 weeks of age. The percentage of poorly differentiated PC cells was significantly lower in the experimental group than in the control group at 30 and 52 weeks of age. The survival period in the experimental group was significantly longer than that in the control group, and the percentage of apoptotic cells in the experimental group was significantly higher than that in the control group at 15, 30, and 52 weeks of age. Thus, an EP1 receptor antagonist delayed PC progression via the upregulation of apoptosis. We suggest that EP1 receptor may be a novel chemopreventive agent for the development of PC.

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Background/Aim: Prostaglandin (PG) E 2 mediates malignant aggressiveness by binding to four specific E-type prostanoid receptors (EP1R -4R). This study aimed to clarify the pathological significance of EPRs in hormone-sensitive prostate cancer (HSPC) and castration-resistant prostate cancer (CRPC). Materials and Methods: EP1R -4R expression was examined in 102 HSPC and 27 CRPC specimens. The relationships between their expression and proliferation index (PI), apoptotic index (AI), and vascular endothelial growth factor (VEGF)-A expression were analyzed. Results: EP4R expression in CRPC was significantly higher compared to that in HSPC, even in advanced disease (T3/4, N1, and/or M1). EP4R expression was significantly correlated with PI, AI, and VEGF-A expression in CRPC. Such significant relationshipswere not detected between EP1R -3R and CRPC. Conclusion: EP4R expression in CRPC was significantly higher than that in HSPC and was associated with cancer cell proliferation, apoptosis, and pro-angiogenetic potential.