Fatty acid binding proteins (FABPs) in prostate, bladder and kidney cancer cell lines and the use of IL-FABP as survival predictor in patients with renal cell carcinoma

Angelika Tölle,Saba Suhail,Carsten Stephan,Monika Jung,Klaus Jung

doi:10.1186/1471-2407-11-302

Angelika Tölle, Saba Suhail + Show 3 more

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https://doi.org/10.1186/1471-2407-11-302

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Abstract

BackgroundFatty acid binding proteins (FABP) play an important role in carcinogenesis. Modified FABP expression patterns were described for prostate, bladder and for renal cell carcinoma. Studies on metabolic relationships and interactions in permanent cell lines allow a deeper insight into molecular processes. The aim of this study is therefore a systematic overview on mRNA and protein expressions of seven FABPs in frequently used urological cell lines.MethodsNine cell lines of renal carcinomas, seven of urinary bladder carcinomas, and five of prostate carcinomas were investigated. Quantitative RT-qPCR and western blotting were used to determine different FABPs. In addition, 46 paired cancerous and noncancerous tissue samples from nephrectomy specimen with renal cell carcinomas were investigated regarding the ileum FABP mRNA expression level and associated with survival outcome.ResultsGeneral characteristics of all urological carcinoma cell lines were the expression of E-and IL-FABP on mRNA and protein level, while the expressions differed between the cell lines. The protein expression was not always congruent with the mRNA expression. Renal cell carcinoma cell lines showed expressions of L-, H- and B-FABP mRNA in addition to the general FABP expression in five out of the eight investigated cell lines. In bladder cancer cell lines, we additionally found the expression of A-FABP mRNA in six cell lines, while H-FABP was present only in three cell lines. In prostate cancer cell lines, a strong reduction of A- and E- FABP mRNA was observed. The expression of B-FABP mRNA and protein was observed only in the 22 RV-1 cells. IL-FABP mRNA was over-expressed in renal tumour tissue. The IL-FABP ratio was identified as an independent indicator of survival outcome.ConclusionsDistinctly different FABP expression patterns were observed not only between the cell lines derived from the three cancer types, but also between the cell lines from the same cancer. The FABP patterns in the cell lines do not always reflect the real situation in the tumours. These facts have to be considered in functional studies concerning the different FABPs.

Highlights

Fatty acid binding proteins (FABP) play an important role in carcinogenesis
FABP expression on transcript and protein levels in cell lines The general characteristic of all urological carcinoma cell lines is the expression of E-and IL-FABP both on mRNA and protein level (Figure 2A-C), while the expressions differed between the cell lines
Renal cell carcinoma cell lines The cell line HK-2 derived from normal renal tissue only expressed mRNAs of E-FABP and IL-FABP

Summary

Introduction

Fatty acid binding proteins (FABP) play an important role in carcinogenesis. Modified FABP expression patterns were described for prostate, bladder and for renal cell carcinoma. The aim of this study is a systematic overview on mRNA and protein expressions of seven FABPs in frequently used urological cell lines. Fatty acid binding proteins (FABPs) represent a family of cytosolic proteins containing 9 different types. Colon [15], breast [16], kidney [4], liver [17], prostate [2], stomach [18], intestine FABP (2). Bladder [3], breast [16,21], prostate [2]. Bladder [14], breast [16], oral [22], pancreas [23], prostate [2]

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