Effect of regulated expression of the fragile histidine triad gene on cell cycle and proliferation.
The mechanism of tumor suppressor action of the fragile histidine triad (FHIT) gene is unknown. Disruption of cell cycle regulation leads to the tumor formation and many tumor suppressor genes suppress tumorigenesis through their effect on cell cycle regulation. We examined the expression of FHIT during the cell cycle, and determined whether overexpression of FHIT affects cell cycle kinetics and apoptosis. The FHIT cDNA was cloned into the ecdysone-inducible expression vector in both the sense and antisense orientations. Overexpression of the sense or antisense construct did not affect cell proliferation, cell cycle distribution or apoptosis in human 293T cells. Analysis of the FHIT expression in 293T cells collected at various cell cycle phases showed that the expression of FHIT is not under cell cycle regulation. These results indicate that the tumor suppressor activity of the FHIT gene may be independent of an effect on the cell cycle and apoptosis mechanisms.
Guo
Z
Z
Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha 68198-4525, USA.
Vishwanatha
J K
JK
D017766:Acid Anhydride Hydrolases; D002453:Cell Cycle / Q000235:genetics*; D002455:Cell Division / Q000235:genetics; D002478:Cells, Cultured; D005786:Gene Expression Regulation; D005822:Genetic Vectors; D006801:Humans; D009363:Neoplasm Proteins; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection; D000099170:Bis(5'-adenosyl)triphosphatase
D017766:Acid Anhydride Hydrolases; D009363:Neoplasm Proteins; D011506:Proteins; D000099170:Bis(5'-adenosyl)triphosphatase