Serum quantitative proteomic analysis reveals potential zinc-associated biomarkers for nonbacterial prostatitis.

Abstract

BACKGROUND:

Prostatitis is one of the most common urological problems afflicting adult men. The etiology and pathogenesis of nonbacterial prostatitis, which accounts for 90-95% of cases, is largely unknown. As serum proteins often indicate the overall pathologic status of patients, we hypothesized that protein biomarkers of prostatitis might be identified by comparing the serum proteomes of patients with and without nonbacterial prostatitis.

METHODS:

All untreated samples were collected from subjects attending the Fangchenggang Area Male Health and Examination Survey (FAMHES). We profiled pooled serum samples from four carefully selected groups of patients (n = 10/group) representing the various categories of nonbacterial prostatitis (IIIa, IIIb, and IV) and matched healthy controls using a mass spectrometry-based 4-plex iTRAQ proteomic approach. More than 160 samples were validated by ELISA.

RESULTS:

Overall, 69 proteins were identified. Among them, 42, 52, and 37 proteins were identified with differential expression in Category IIIa, IIIb, and IV prostatitis, respectively. The 19 common proteins were related to immunity and defense, ion binding, transport, and proteolysis. Two zinc-binding proteins, superoxide dismutase 3 (SOD3), and carbonic anhydrase I (CA1), were significantly higher in all types of prostatitis than in the control. A receiver operating characteristic curve estimated sensitivities of 50.4 and 68.1% and specificities of 92.1 and 83.8% for CA1 and SOD3, respectively, in detecting nonbacterial prostatitis. The serum CA1 concentration was inversely correlated to the zinc concentration in expressed-prostatic secretions.

CONCLUSIONS:

Our findings suggest that SOD3 and CA1 are potential diagnostic markers of nonbacterial prostatitis, although further large-scale studies are required. The molecular profiles of nonbacterial prostatitis pathogenesis may lay a foundation for discovery of new therapies.

• Authors: Xiaoli Yang, Hongtao Li, Chengdong Zhang, Zhidi Lin, Xinhua Zhang, Youjie Zhang, Yanbao Yu, Kun Liu, Muyan Li, Yuening Zhang, Wenxin Lv, Yuanliang Xie, Zheng Lu, Chunlei Wu, Ruobing Teng, Shaoming Lu, Min He, Zengnan Mo
• Journal: The Prostate (Prostate) Vol. 75 Issue 14 Pg. 1538-55 (Oct 2015) ISSN: 1097-0045 [Electronic] United States
• PMID: 26010976 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2015 Wiley Periodicals, Inc.

Chemical References

• Biomarkers
• Zinc

Topics

• Adult
• Biomarkers (blood)
• Health Surveys (methods)
• Humans
• Male
• Middle Aged
• Prostatitis (blood, diagnosis)
• Proteomics (methods)
• Zinc (blood)