Protein abundancy and mRNA levels of the adipocyte-type fatty acid binding protein correlate in non-invasive and invasive bladder transitional cell carcinomas

Int J Oncol. 1998 Aug;13(2):379-83. doi: 10.3892/ijo.13.2.379.


The adipocyte type fatty acid-binding protein (A-FABP) is a small molecular weight fatty acid-binding protein whose expression correlates both with the grade of atypia and the stage of bladder transitional cell carcinomas (TCCs). To determine if the protein abundancy correlates with the mRNA levels in non-invasive and invasive lesions, we have analysed fresh TCCs (grade II, Ta; grade III, T2-4) by two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) and measured the mRNA levels using the reverse transcription linked polymerase chain reaction (RT-PCR). Overall, the results showed a good correlation between protein abundancy and mRNA levels, indicating that the lack of expression of the protein observed in some lesions reflects low levels of transcription of the A-FABP gene rather than translational regulation. In addition, our studies showed that the loss of A-FABP protein observed in some tumors is not compensated by an increase in the skin fatty acid-binding protein PA-FABP, as is the case in the A-FABP knockout mice.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carcinoma, Transitional Cell / metabolism*
  • Carcinoma, Transitional Cell / pathology*
  • Carrier Proteins / biosynthesis*
  • Electrophoresis, Polyacrylamide Gel
  • Fatty Acid-Binding Protein 7
  • Fatty Acid-Binding Proteins
  • Humans
  • Myelin P2 Protein / biosynthesis*
  • Neoplasm Invasiveness
  • Neoplasm Proteins*
  • Polymerase Chain Reaction
  • RNA, Messenger / metabolism*
  • Tumor Suppressor Proteins*
  • Urinary Bladder Neoplasms / metabolism*
  • Urinary Bladder Neoplasms / pathology*


  • Carrier Proteins
  • FABP7 protein, human
  • Fatty Acid-Binding Protein 7
  • Fatty Acid-Binding Proteins
  • Myelin P2 Protein
  • Neoplasm Proteins
  • RNA, Messenger
  • Tumor Suppressor Proteins