Changes of urinary nerve growth factor and prostaglandins in male patients with overactive bladder symptom

Abstract

Aim : Nerve growth factor (NGF) and prostaglandins (PG) in the urinary bladder can be affected by pathology of bladder, and this change can be noted in the urine. This study was performed to investigate the changes in urinary NGF and PG in male patient with overactive bladder (OAB) symptoms.Methods : The study group included 75 male patients with OAB symptoms and 20 males without bladder symptoms as controls. Evaluation included history-taking, urinalysis, International Prostate Symptom Score (IPSS) and urodynamic study. The NGF, PGE 2 , PGF 2 α and PGI 2 levels in voided urine were analyzed by enzyme linked immunosorbent assay and these results were compared in control and OAB patients. Also, the urinary levels of NGF and PG were correlated with IPSS score and urodynamic parameters in OAB patients.Results : The urinary levels of NGF and PGE 2 were significantly increased in patients with OAB compared with control ( P < 0.05). The urodynamic study in OAB patients showed that more than half of the patients had detrusor overactivity and bladder outlet obstruction. The incidence of detrusor underactivity was noted in seven patients in the OAB group. The urinary level of PGE 2 was decreased in patients with detrusor underactivity compared with patients without detrusor underactivity ( P < 0.05), and negatively correlated with maximum bladder capacity in OAB patients ( P < 0.05).Conclusions : NGF and PG may have important role in male patients with OAB, and the urinary level of PGE 2 can change according to detrusor function. Therefore, these results may be used as urinary markers to evaluate the OAB symptoms.

Detrusor myocyte activity and afferent signaling

“…High concentrations of PGE2 have been detected in the urine of OAB patients, suggesting that PGE2 may contribute to the pathophysiology of the disorder. 79,80 Prostanoids may affect afferent activity in two ways: by effects on the smooth muscle and/or via direct effects on afferent nerves. Prostaglandins have direct contractile effects on the human detrusor, which may contribute to the spontaneous contractile activity.…”

Biomarkers in the Overactive Bladder Syndrome

“…Recent studies have demonstrated the presence of NGF in the urine of OAB patients (Kim et al, 2005;Kim et al, 2006;Liu & Kuo, 2008;Liu et al, 2009a, b;Liu et al, 2009c;Jacobs et al, 2010;Liu et al, 2011a). Levels were significantly higher than in healthy individuals and subsided after successful treatment with antimuscarinics (Liu et al, 2009b) or botulinum toxin-A (Liu et al, 2009a), in parallel with a decrease in the USS score.…”

“…This supports a role for this prostanoid during bladder dysfunction and has justified a few inconclusive clinical trials regarding the use of non-steroidal anti-inflammatory drugs in the treatment of OAB. So, expectations were raised when Kim and co-workers found that levels of PGE 2 and PGF 2 were significantly higher in male and female OAB patients that in healthy controls (Kim et al, 2005;Kim et al, 2006). However, PG concentrations were not corrected for urine concentration.…”

Nerve growth factor signaling following unilateral pelvic ganglionectomy in the rat ventral prostate is age dependent

“…These results suggest that increased Ngf is associated with clinical BPH symptoms. 16 In order to determine if NGF also plays a role in abnormal prostate growth, we examined the effects of innervation on NGF abundance and localization in sham, denervated and intact (contralateral) ventral prostate (VP) after pelvic ganglionectomy. We propose that denervation on one side of the VP increases prostate innervation and autonomic hyperactivity in the contralateral non-perturbed VP, which may result in increased growth.…”