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Urinary brain-derived neurotrophic factor: a potential biomarker for objective diagnosis of overactive bladder

  • Urology - Original Paper
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Abstract

Purpose

To investigate the diagnostic performance of urinary brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) as potential biomarkers for overactive bladder (OAB).

Methods

Ninety women diagnosed with OAB and 45 normal controls without OAB were enrolled. Urine samples were collected from all subjects. Urinary BDNF and NGF levels were measured using enzyme-linked immunosorbent assays. Results normalized by urinary creatinine (Cr) levels were compared between OAB groups and controls. Symptom severity was assessed using overactive bladder symptom score.

Results

Urinary BDNF and NGF levels were elevated in OAB groups but not in controls. Mean (SD) baseline BDNF and NGF levels normalized by Cr levels were significantly higher in OAB subjects than in controls (20.609 ± 23.932 vs. 1.779 ± 0.729, p < 0.01) and (0.258 ± 0.264 vs. 0.081 ± 0.028, p < 0.01), respectively. Urinary BDNF/Cr levels were 80-fold higher than NGF/Cr levels in OAB subjects. Receiver operating characteristic curves for assessing urinary BDNF/Cr levels in OAB groups showed sensitivity and specificity of 93.33 and 88.89 %, respectively. Urinary BDNF levels were associated with OAB symptom severity.

Conclusions

Urinary BDNF/Cr levels are elevated in women with OAB and are significantly associated with symptom severity. No elevation of BDNF is found in women without OAB. BDNF analysis has better sensitivity than NGF in detecting OAB in subjects without other lower urinary tract disorders. Results of the present study suggest a potential role for BDNF as an objective biomarker for OAB diagnosis.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Correspondence to Bo Hai.

Additional information

Long-wang Wang and Xiao-min Han contributed equally to this study.

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Wang, Lw., Han, Xm., Chen, Ch. et al. Urinary brain-derived neurotrophic factor: a potential biomarker for objective diagnosis of overactive bladder. Int Urol Nephrol 46, 341–347 (2014). https://doi.org/10.1007/s11255-013-0540-x

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  • DOI: https://doi.org/10.1007/s11255-013-0540-x

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