Seiya Inoue

Effect of silodosin on detrusor overactivity in the male spontaneously hypertensive rat

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Nicorandil ameliorates hypertension‐related bladder dysfunction in the rat

There is increasing evidence that ischemia is one of the main etiology in overactive bladder (OAB), and that nicorandil prevents OAB. We investigated the effect of nicorandil on hypertension‐related bladder dysfunction in spontaneously hypertensive rats (SHRs).

Edaravone ameliorates diabetes-induced dysfunction of NO-induced relaxation in corpus cavernosum smooth muscle in the rat.

INTRODUCTION Diabetes mellitus (DM) represents a major risk factor for erectile dysfunction (ED). Although the etiology of diabetes-induced ED is multifactorial and still unknown, reactive oxygen species are thought to be one of the key factors. AIM The aim of this article is to investigate whether administration of edaravone, a free radical scavenger, could prevent type 1 diabetes-induced dysfunction of nitric oxide (NO)-induced relaxation in corpus cavernosum smooth muscle in the rat. METHODS Six-week-old male Wistar rats were randomly divided into three groups. One group was treated with citrate-phosphate buffer plus normal saline (group Cont), whereas in the other two groups, diabetes was induced by streptozotocin (50 mg/kg intraperitoneally [i.p.]). Subsequently, the diabetic rats were treated for 4 weeks either with edaravone (10 mg/kg/day, i.p.; group DM + E) or with normal saline (group DM). MAIN OUTCOME MEASURES Serum glucose and malondialdehyde levels as well as penile cyclic guanosine monophosphate (cGMP) concentrations were determined, and penile function was estimated by organ bath studies with norepinephrine-mediated contractions and acetylcholine-mediated relaxations. The participation mRNA levels of muscarinic M(3) receptors, neuronal nitrous oxide synthase (nNOS), endothelial NOS (eNOS) and inducible NOS (iNOS), and participation protein levels of nNOS, eNOS, phosphorylated nNOS, and phosphorylated eNOS were investigated by quantitative real-time polymerase chain reaction (PCR) and immunoblot analysis, respectively. RESULTS Treatment with edaravone prevented partially but significantly the decreased body and penile weight induced by diabetes. Treatment with edaravone significantly improved the increased diabetes-induced malondialdehyde levels, the decreased penile cGMP concentrations, the increased diabetes-induced norepinephrine-mediated contractions, and the decreased acetylcholine-mediated relaxation. Although there were no significant differences in expression levels of mRNAs in nNOS, diabetes-induced upregulation of muscarinic M(3) receptor and iNOS mRNAs as well as diabetes-induced downregulations of eNOS, phosphorylated nNOS, and phosphorylated eNOS were significantly prevented by edaravone. CONCLUSIONS Edaravone decreases the oxidative insult in the penile corpus cavernosum by ameliorating the NO-NOS system and thus preventing partially the developing ED in DM in the rat.

Hydronephrosis after retroperitoneal laparoscopic dismembered Anderson-Hynes pyeloplasty in adult patients with ureteropelvic junction obstruction: A longitudinal analysis

Objective We evaluated the improvement of hydronephrosis longitudinally after laparoscopic dismembered Anderson–Hynes pyeloplasty in adult patients with ureteropelvic junction obstruction. Material and methods Sixteen patients underwent laparoscopic pyeloplasty at our institution between January 2006 and June 2012. Hydronephrosis was assessed by ultrasound and intravenous pyelography at 3, 6, 12, 18, and 24 months after pyeloplasty. Results The mean follow–up time was 24 months. Preoperative hydronephrosis was diagnosed as grade 2 and grade 3 in 8 patients each. Postoperative improvement of the hydronephrosis by one grade was observed in 56%, 73%, 67%, 50%, and 40% of patients at 3, 6, 12, 18, and 24 months, respectively. Improvement of the hydronephrosis by two grades was observed in 6%, 27%, 33%, 50%, and 60% of patients at 3, 6, 12, 18, and 24 months, respectively. In 5 of 12 patients (42%), hydronephrosis was still improving even after 12 months postoperatively. Conclusions Adult patients demonstrate relatively rapid improvements in the degree of hydronephrosis after laparoscopic pyeloplasty and continue to improve for a long time.

Inhibitory Role of the Spinal Galanin System in the Control of Micturition

OBJECTIVE To investigate the effect of intrathecal galanin on the micturition reflex in rats. METHODS Continuous cystometrograms (0.04 mL/min infusion rate) were performed in female Sprague-Dawley rats (225-248 g) under urethane anesthesia. After stable micturition cycles were established, galanin was administered intrathecally to evaluate changes in bladder activity. Then, to examine the involvement of opioid systems in the galanin effects, galanin was administered intrathecally when the first bladder contraction was observed after intrathecal administration of naloxone, an opioid receptor antagonist. RESULTS Intrathecal administration of galanin (1-10 μg) increased intercontraction intervals in a dose-dependent fashion. Intrathecal administration of galanin (1-10 μg) also increased pressure threshold in a dose-dependent fashion. These inhibitory effects of galanin (10 μg) were partially antagonized by intrathecal administration of naloxone (10 μg). CONCLUSION These results indicate that in urethane-anesthetized rats, galanin delays the onset of micturition through activation of the opioid mechanism, suggesting the inhibitory role of galanin system in the control of the micturition reflex.

Sensory neurone-specific receptor-mediated regulation of micturition reflex in urethane-anaesthetized rats

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A Case of IgG4-Related Retroperitoneal Fibrosis from the Renal Pelvis Mimicking Bilateral Hydronephrosis

We describe a 49-year-old woman who presented with continuous bilateral lumbago. As the patients ultrasonography manifestations were very similar to those of bilateral hydronephrosis, we performed retrograde pyelography and ureteroscopy. However, apart from slight left ureteropelvic junction obstruction, there was no hydronephrosis. Since malignant disease could not be completely denied, computed tomography-guided biopsy was performed. However, the tissue did not show evidence of malignancy. As the patient continued to have lumbago, we measured serum IgG4 levels because of suspicion of retroperitoneal fibrosis secondary to IgG4-related disease, which proved to be high. Further, immunostaining of the renal pelvic biopsy samples showed IgG4-positive cells. Therefore, diagnosing IgG4-related retroperitoneal fibrosis, we administered corticosteroids. The patient responded favorably to the drug, with gradual regression of the lesion.

Botulinum toxin type A injection for neurogenic detrusor overactivity: clinical outcome in Japanese patients.

To report our experience with intravesical injection of botulinum toxin type A into the detrusor muscle of patients with neurogenic detrusor overactivity secondary to suprasacral spinal cord lesions or multiple sclerosis.

Intravesical Oxybutynin for Neurogenic Bladder in Children

Neuropathic bladder dysfunction caused by spinal cord disease may lead to irreversible renal damage and urinary incontinence. The majority of affected children can be successfully managed with standard medical treatment such as oral anti-cholinergic medication (typically oxybutynin or tolterodine) with or without Clean Intermittent Catheterization (CIC). The efficacy of this treatment, however, may be hampered as some of these patients experience severe Adverse Events (AEs) or insufficient suppression of detrusor over activity following oral anti-muscarinic pharmacotherapy. Intravesical oxybutynin chloride is an effective therapy for neurogenic bladder dysfunction; this review considers the indications, administration, safety, and efficacy of intravesical oxybutynin chloride instillation. In addition, some cases of children treated with intravesical oxybutynin chloride solution supplemented with hydroxypropylcellulose (modified intravesical oxybutynin) are described.

Inhibitory Effect of Somatostatin Receptor Subtype-4 Agonist NNC 26-9100 on Micturition Reflex in Rats

OBJECTIVE To investigate the effects of activation of somatostatin subtype 4 (SST4) on the micturition reflex in rats. METHODS Continuous cystometrograms (0.04 mL/min infusion rate) were performed in female Sprague-Dawley rats (242-265 g) under urethane anesthesia. After stable micturition cycles were established, a selective SST4 receptor agonist, NNC 26-9100, was administered intravenously in normal rats or rats pretreated with capsaicin 4 days before the experiments. The micturition parameters were recorded and compared before and after drug administration. RESULTS Intravenous administration of NNC 26-9100 (10-300 μg/kg) significantly increased the intercontraction interval in a dose-dependent fashion. Intravenous administration of NNC 26-9100 (10-300 μg/kg) also significantly increased the pressure threshold in a dose-dependent fashion. No significant changes were seen in the baseline pressure, maximum voiding pressure, or postvoid residual urine volume. However, NNC 26-9100-induced increases in the intercontraction intervals and pressure threshold were not seen in rats with C-fiber desensitization induced by capsaicin pretreatment. CONCLUSION These results indicate that in urethane-anesthetized rats, activation of the SST4 receptor can inhibit the micturition reflex by suppression of capsaicin-sensitive C-fiber afferent pathways. Thus, the SST4 receptor could be a potential target for the treatment of C-fiber afferent-mediated bladder dysfunction.