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Expression profile of tyrosine kinases in breast cancer
Funda Meric1, Wei-Ping Lee, Aysegul Sahin
1Department of Surgical Oncology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
Abstract:
The tyrosine kinase (TK) family includes many growth factor receptors, cell cycle regulators, and oncoproteins. Moreover, the receptor TKs HER2/neu and epidermal growth factor receptor are overexpressed in a subgroup of breast tumors and correlate with more aggressive behavior. Thus, TKs are being actively pursued as therapeutic targets. The purpose of this study was to determine the expression pattern of TKs in breast cancer. Reverse transcription-PCR was performed with degenerate primers based on conserved motifs of the catalytic domains of TKs, and the identities of the reverse transcription-PCR products were determined by digestion with a panel of restriction enzymes. Using a TK display assay, we studied the TK profiles of 13 breast cancer cell lines and two normal immortalized breast epithelial cell lines. The TK display assay reproducibly demonstrated known differences in HER-2/neu expression between cell lines. Several TKs, including receptor TKs Axl, Cak, fibroblast growth factor receptor 4, HEK8, HER2/neu, c-MET, RET, and nonreceptor TKs ARG, BRK, Janus kinase 1, Rak, and YES were detected in breast cancer cells. Several kinases were differentially expressed among the cell lines. Similar TK profiles were found using RNA from human breast tumors. We conclude that there is significant variability in the TK expression pattern of breast cancers. This variability should be considered when selecting TK inhibitors to treat patients.
Insights
Tyrosine kinases (TKs) show varied expression in breast cancer, impacting treatment. Understanding TK profiles is crucial for selecting targeted therapies and improving patient outcomes.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Tyrosine kinases (TKs) are crucial in cell signaling, growth, and cancer development.
- Overexpression of certain TKs like HER2/neu is linked to aggressive breast cancer phenotypes.
- TKs represent important therapeutic targets in oncology.
Purpose of the Study:
- To comprehensively map the expression patterns of TKs in breast cancer.
- To identify differential TK expression among various breast cancer cell lines and primary tumors.
Main Methods:
- Utilized degenerate primers and reverse transcription-polymerase chain reaction (RT-PCR) to detect TKs.
- Employed TK display assays for profiling TK expression in cell lines and tumor RNA.
- Confirmed TK identities using restriction enzyme digestion.
Main Results:
- Detected a wide range of TKs, including receptor TKs (Axl, FGFR4, HER2/neu, c-MET, RET) and nonreceptor TKs (ARG, BRK, JAK1, Rak, YES) in breast cancer cells.
- Observed significant and reproducible differences in TK expression profiles across different breast cancer cell lines.
- Demonstrated similar variable TK expression patterns in RNA derived from human breast tumors.
Conclusions:
- Breast cancers exhibit substantial heterogeneity in their tyrosine kinase expression profiles.
- This variability in TK expression necessitates personalized approaches when selecting TK inhibitors for treatment.
- Targeted therapy selection should consider individual patient tumor TK profiles for optimal efficacy.