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Pediatric brain tumors express multiple receptor tyrosine kinases including novel cell adhesion kinases
H L Weiner1, M Rothman, D C Miller
1Department of Neurosurgery (Pediatric Neurosurgery), New York University Medical Center, NY 10016, USA.
Abstract:
We have used the polymerase chain reaction to clone and characterize growth factor receptor tyrosine kinases (RTKs) expressed in 3 pathologically distinct pediatric brain tumors, an anaplastic ependymoma, a glioblastoma multiforme and a primitive neuroectodermal tumor (PNET). These neoplasms are presumed to be derived from embryonic neuroepithelial precursor cells of the central nervous system. This cloning demonstrated expression of 24 distinct kinase genes: 16 receptor type kinases and 8 nonreceptor type kinases. The expression of 6 receptors, including Hek2, IRR, Ryk, FGFR3, and 2 members of the newly identified cell adhesion kinase receptor family, DDR and TKT, in such tumors has not been reported previously. Northern analysis of mRNA levels revealed DDR expression in 6 of 7 pediatric brain tumors including an ependymoma, PNET, glioblastoma and astrocytoma, and also in an adult pheochromocytoma. Thus, the DDR cell adhesion kinase may be widely expressed in pediatric brain tumors. Also, PCR cloning may be an effective procedure for characterizing RTKs in clinical tissue samples and revealing the expression of novel RTK species.
Insights
Researchers identified novel growth factor receptor tyrosine kinases (RTKs) in pediatric brain tumors using PCR. DDR kinase was notably expressed in several tumor types, suggesting its potential role and diagnostic utility.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Pediatric brain tumors originate from embryonic neuroepithelial precursor cells.
- Growth factor receptor tyrosine kinases (RTKs) play crucial roles in cell signaling and cancer development.
- Characterizing RTK expression in rare pediatric tumors is vital for understanding tumorigenesis.
Purpose of the Study:
- To clone and characterize RTKs in distinct pediatric brain tumors.
- To identify novel or previously unreported RTK expression in these neoplasms.
- To assess the potential diagnostic and therapeutic relevance of identified RTKs.
Main Methods:
- Polymerase chain reaction (PCR) was employed to clone kinase genes from tumor samples.
- Analysis included 3 distinct pediatric brain tumors: anaplastic ependymoma, glioblastoma multiforme, and primitive neuroectodermal tumor (PNET).
- Northern blot analysis was used to confirm mRNA expression levels of specific kinases.
Main Results:
- Expression of 24 distinct kinase genes was identified, including 16 receptor tyrosine kinases and 8 nonreceptor tyrosine kinases.
- Six RTKs, including DDR and TKT (cell adhesion kinase receptors), Hek2, IRR, and Ryk, were reported for the first time in these tumor types.
- DDR kinase expression was detected in 6 of 7 pediatric brain tumors and an adult pheochromocytoma.
Conclusions:
- PCR cloning is an effective method for characterizing RTKs in clinical samples.
- The DDR cell adhesion kinase receptor may be widely expressed in pediatric brain tumors.
- The identification of novel RTKs provides potential targets for future therapeutic strategies.