Melatonin and Its Role in Lower Urinary Tract Function: An Article Review

Effectiveness of melatonin for the treatment of nocturia: a randomized controlled trial

INTRODUCTION AND HYPOTHESIS

Nocturia affects health and quality of life (QoL). Current medical treatments can cause severe adverse effects, especially when treating elderly patients. Endogenous melatonin has a physiologic role in urinary bladder function, and the exogenous one may be beneficial for this condition. This article aims to evaluate the effectiveness and safety of melatonin for ameliorating nocturia in older women.

METHODS

This randomized, double-blind, placebo-controlled trial was conducted at a university hospital in Thailand. Sixty women with nocturia, aged > 55 years, were prospectively recruited and were later randomly allocated to treatment (melatonin 2 mg/day, n = 30) and control (placebo, n = 30) arms for 2 weeks. Outcome measures included nocturia episodes, nocturia-related parameters, Nocturia Quality of Life Questionnaire (N-QoL) scores, and adverse events.

RESULTS

The treatment and control groups were comparable in mean age (65.9 + 7.5 vs. 68.5 + 6.3 years). Both groups had comparable causes of nocturia with a baseline median voiding frequency of 2.3 (1.3, 6.3) and 2.3 (1.7, 5.3) episodes/night, respectively. The treatment group had significantly better outcomes than the placebo group in terms of median reduction in nocturia [-1.0 (-3.0, 0.0) vs. 0.0 (-2.3, 1.3) episodes/night; p < 0.001], increased median duration of the first uninterrupted sleep [1.0 (-0.3, 4.5) vs. 0.0 (-3.0, 2.3) h; p < 0.001], and improvement in N-QoL scoring, especially in the sleep/energy subscale (p = 0.019) and the total score (p = 0.016). Adverse events were comparable between groups.

CONCLUSIONS

Melatonin can be considered a safe and effective treatment for nocturia in elderly women.

Oxidative Stress Biomarkers in Age-Related Lower Urinary Tract Disorders: A Systematic Review

PURPOSE

To conduct a systematic review of preclinical and clinical peer-reviewed evidence linking alterations in oxidative stress biomarkers or outcome measures that were also prevalent in specific age-related lower urinary tract (LUT) disorders.

METHODS

PubMed, Scopus, CINAHL, and Embase were searched for peer-reviewed studies published between January 2000 and March 2021. Animal and human studies that reported on the impact of oxidative stress in age-related LUT disorders through structural or functional changes in the LUT and changes in biomarkers were included. The PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) protocol was followed.

RESULTS

Of 882 articles identified, 21 studies (13 animal; 8 human) met inclusion criteria. Across LUT disorders, common structural changes were increased bladder and prostate weights, ischemic damage, nerve damage and detrusor muscle hypertrophy; common functional changes included decreased bladder contraction, increased bladder sensation and excitability, decreased perfusion, and increased inflammation. The disorders were associated with increased levels of biomarkers of oxidative stress that provided evidence of either molecular damage, protective mechanisms against oxidative stress, neural changes, or inflammation. In all cases, the effect on biomarkers and enzymes was greater in aged groups compared to younger groups.

CONCLUSION

Increased oxidative stress, often associated with mitochondrial dysfunction, plays a significant role in the pathogenesis of age-related LUT disorders and may explain their increasing prevalence. This systematic review identifies potential markers of disease progression and treatment opportunities; further research is warranted to evaluate these markers and the mechanisms by which these changes may lead to age-related LUT disorders.

Nrf2 Pathway Ameliorates Bladder Dysfunction in Cyclophosphamide-Induced Cystitis via Suppression of Oxidative Stress

OBJECTIVE

To investigate the protective effect and molecular mechanism of nuclear factor E2-related factor 2 (Nrf2) pathway in interstitial cystitis (IC).

METHODS

We established a mouse model of IC by cyclophosphamide (CYP) in wild-type mice and Nrf2 gene knockout mice. We examined the histological and functional alterations, the changes of oxidative stress markers, and the expression of the antioxidant genes downstream of Nrf2 pathway.

RESULTS

After CYP administration, the mice showed urinary frequency and urgency, pain sensitization, decreased contractility, bladder edema, and oxidative stress disorder. Notably, the Nrf2-/- CYP mice had more severe symptoms. The mRNA and protein levels of antioxidant genes downstream of Nrf2 pathway were significantly upregulated in the Nrf2+/+ CYP mice, while there were no significant changes in the Nrf2-/- CYP mice.

CONCLUSION

Nrf2 pathway protects bladder injury and ameliorates bladder dysfunction in IC, possibly by upregulating antioxidant genes and inhibiting oxidative stress.

Therapeutic Effects of Prolonged Release Melatonin (Circadin®) in Patients with Overactive Bladder and Chronic Insomnia in More Than 55 Years Old

Objectives Bladder storage symptoms including nocturia is the most common cause of sleep disturbance in all age groups. Sleep disturbance is also a main cause of nocturia so that sleep recovery can clinically improve nocturia. Melatonin has main action to induce sleep and additional effects of smooth muscle relaxation, free radical scavenging, anti-inflammation, et cetera. This study was evaluated the improvement of sleep quality after administrating prolonged-release melatonin in elderly patients with overactive bladder and chronic insomnia. Methods This clinical trial was performed with a randomized single open study. Thirty-seven patients with overactive bladder and chronic insomnia were initially enrolled in this study. After 4 or 12 weeks treating with 2 mg of prolonged-release melatonin, clinical outcomes were evaluated with OABSS, IPSS, PSQI and WHO 5 well-being index. Results Of the 37 patients, 34 (91.9%) were included in the ITT group and 26 (76.5%) in the PP group. In the primary outcome of PP group, significant improvements were observed in total OABSS and nocturia frequencies at 12 weeks, respectively. Secondary outcome measurement including in voiding, storage symptoms, and total IPSS scores showed the improvement at 4 and 12 weeks and in total and sleep quality PSQI scores at 12 weeks, and in quality of life scores of the WHO 5 well-being index at 12 weeks. Only one (3.8%) adverse event was observed. Conclusions These results suggest clearly that prolonged-release melatonin in elderly patients with overactive bladder and chronic insomnia has the potential to control concomitant voiding and sleep difficulty.