Hydronephrotic urine in the obstructed kidney promotes urothelial carcinoma cell proliferation, migration, invasion through the activation of mTORC2-AKT and ERK signaling pathways.

Abstract

Obstructive nephropathy is the most common presentation of urothelial carcinoma. The role of the urine in the obstructed kidney namely "hydronephrotic urine" in urothelial carcinoma has not been extensively explored. This study aims to evaluate whether hydronephrotic urine in the obstructed kidney could promote urothelial carcinoma. The hydronephrotic urine was collected from the obstructed kidneys of Sprague-Dawley rats induced by different periods of unilateral ureteral obstruction (UUO). By the inhibition of LY294002 and PD184352, we confirm that hydronephrotic urine promotes urothelial carcinoma cell (T24) and immortalized normal urothelial cells (E6) proliferation, migration and invasion in a dose-dependent manner through the activation of the mTORC2-AKT and ERK signaling pathways. Hydronephrotic urine also increases the expression of cyclin-D2, cyclin-B and CDK2. It also decreases the expression of p27 and p21 in both urothelial carcinoma cells and normal urothelial cells. By the protein array study, we demonstrate that many growth factors which promote tumor cell survival and metastasis are over-expressed in a time-dependent manner in the hydronephrotic urine, including beta-FGF, IFN-γ, PDGF-BB, PIGF, TGF-β, VEGF-A, VEGF-D and EGF. These results suggest that hydronephrotic urine promotes normal and malignant urothelial cells proliferation, migration and invasion, through the activation of the mTORC2-AKT and ERK signaling pathways. Further investigation using live animal models of tumor growth may be needed to clarify aspects of these statements.

• Authors: Chi-Hao Chang, Jian-Ri Li, Kuo-Hsiung Shu, Yun-Ching Fu, Ming-Ju Wu
• Journal: PloS one (PLoS One) Vol. 8 Issue 9 Pg. e74300 ( 2013) ISSN: 1932-6203 [Electronic] United States
• PMID: 24023933 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Multiprotein Complexes
• Epidermal Growth Factor
• Mechanistic Target of Rapamycin Complex 2
• Proto-Oncogene Proteins c-akt
• TOR Serine-Threonine Kinases
• Extracellular Signal-Regulated MAP Kinases

Topics

• Animals
• Cell Line, Tumor
• Cell Movement (drug effects)
• Cell Proliferation
• Cell Survival (drug effects)
• Epidermal Growth Factor (pharmacology)
• Extracellular Signal-Regulated MAP Kinases (metabolism)
• Gene Expression Regulation, Neoplastic (drug effects)
• Hydronephrosis (therapy, urine)
• Male
• Mechanistic Target of Rapamycin Complex 2
• Multiprotein Complexes (metabolism)
• Neoplasm Invasiveness
• Neovascularization, Pathologic
• Proto-Oncogene Proteins c-akt (metabolism)
• Rats
• Rats, Sprague-Dawley
• Signal Transduction (drug effects)
• TOR Serine-Threonine Kinases (metabolism)
• Urologic Neoplasms (blood supply, pathology)
• Urothelium (pathology)