Differential Expression of SDF-1 Isoforms in Bladder Cancer

作者：Gosalbez Miguel; Hupe Marie C; Lokeshwar Soum D; Yates Travis J; Shields John; Veerapen Muthu K; Merseburger Axel S; Rosser Charles J; Soloway Mark S; Lokeshwar Vinata B^*

来源：Journal of Urology, 2014, 191(6): 1899-1905.

DOI：10.1016/j.juro.2013.11.053

• urinary bladder neoplasms
• chemokine CXCL12
• tumor markers, biological
• prognosis
• neoplasm recurrence, local

Purpose: SDF-1 is a ligand of the chemokine receptors CXCR4 and 7. The 6 known SDF-1 isoforms are generated by alternative mRNA splicing. While SDF-1 expression has been detected in various malignancies, only few groups have reported differential expression of SDF-1 isoforms and its clinical significance. We evaluated the expression of 3 SDF-1 isoforms (alpha, beta and gamma) in bladder cancer. %26lt;br%26gt;Materials and Methods: Using quantitative polymerase chain reaction we measured SDF-1 alpha, beta and gamma mRNA levels in 25 normal and 44 bladder cancer tissues, and in 210 urine specimens (28 normal, 74 benign, 57 bladder cancer, 35 bladder cancer history, 8 other cancer history and 8 other cancer) from consecutive patients. Levels were correlated with clinical outcome. %26lt;br%26gt;Results: Of the SDF-1 isoforms only SDF-1 beta mRNA was significantly over expressed 2.5-fold to sixfold in bladder cancer compared to normal bladder tissues. SDF-1 alpha was expressed in bladder tissues but SDF-1 gamma was undetectable. On multivariate analysis SDF-1 beta was an independent predictor of metastasis and disease specific mortality (p = 0.017 and 0.043, respectively). In exfoliated urothelial cells only SDF-1 beta mRNA levels were differentially expressed with 91.2% sensitivity and 73.8% specificity for detecting bladder cancer. In patients with a bladder cancer history increased SDF-1 beta levels indicated a 4.3-fold increased risk of recurrence within 6 months (p = 0.0001). %26lt;br%26gt;Conclusions: SDF-1 isoforms are differentially expressed in bladder tissues and exfoliated urothelial cells. SDF-1 beta mRNA levels in bladder cancer tissues predict a poor prognosis. Furthermore, SDF-1 beta mRNA levels in exfoliated cells detect bladder cancer with high sensitivity and they are a potential predictor of future recurrence.

• 出版日期2014-6