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- Title
Urokinase plasminogen activator receptor (uPAR) expression is reduced by tyrosine kinase inhibitors.
- Authors
Skogseth, Haakon; Larsson, Erik; Halgunset, Jostein
- Abstract
Previously we reported that tyrosine kinase inhibitors (TKI) produced a reduction in uPA expression in prostatic cancer cells, and that TKI-treated cells were less invasive compared to untreated cells. Nevertheless, no change in cell migration was observed when TKI-treated cells were supplied with external uPA, thus indicating more complex mechanisms leading to decreased cell invasion. uPAR expression was measured with an enzyme- linked immunosorbent assay (ELISA) in PC-3 and DU-145 prostate carcinoma cells treated with the two TKI genistein and AG-1478. uPAR mRNA levels were measured with real-time reverse transcriptase-polymerase chain reaction (RT-PCR). uPAR immunocytochemistry was used to examine the receptor distribution in cells grown on a reconstituted basal lamina. Immunocytochemistry showed an intense uPAR immunostaining in invading cells, particularly in the leading edge membrane. Treatment with genistein and AG-1478 led to a decreased expression of uPAR in DU-145, but not in PC-3. Furthermore, a reduction of uPAR mRNA was found in TKI-treated DU-145 cells, while PC-3 was not affected. Our results indicate a possible role of TKI as cancer suppressors by acting as a regulator of uPAR expression.
- Subjects
PROTEIN-tyrosine kinases; CANCER cells; THERAPEUTICS; PROSTATE cancer; POLYMERASE chain reaction
- Publication
APMIS, 2006, Vol 114, Issue 4, p307
- ISSN
0903-4641
- Publication type
Article
- DOI
10.1111/j.1600-0463.2006.apm_248.x