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The expression of multiple proto-oncogenes is differentially regulated during retinoic acid induced maturation of
C J Thiele1, L A Deutsch, M A Israel
1Molecular Genetics Section, National Cancer Institute, Bethesda, Maryland 20892.
Abstract:
Human neuroblastoma (NB) is a highly malignant tumor arising in cells that originate in the embryonal neural crest. Several lines of investigation suggest that both NB and other tumors of developing tissues are blocked in their ability to differentiate and achieve growth arrest. Since in vivo differentiation of NB has been frequently observed and may be of clinical importance (Fox et al., 1959; Evans et al., 1976), we have utilized the in vitro induction of NB differentiation by retinoic acid (RA) to study the molecular events associated with NB differentiation. We have focused our studies on changes that occur in the expression of various proto-oncogenes during NB tumors cell differentiation because proto-oncogenes are likely to be of central importance in mediating processes critical for cellular growth and maturation. In these studies, we have found that the expression of no fewer than five proto-oncogenes including c-Ha-ras, c-ets-1, and c-fos change during the differentiation of NB cells, while the expression of c-erb-B changes in association with the arrest of growth that occurs during NB differentiation. In some cases the altered expression of a proto-oncogene was transcriptionally regulated, while in others post-transcriptional mechanisms were important.
Insights
Retinoic acid (RA) induces differentiation in human neuroblastoma (NB) cells. This process alters the expression of key proto-oncogenes, impacting tumor cell growth and maturation.
Area of Science:
- Oncology
- Molecular Biology
- Developmental Biology
Background:
- Human neuroblastoma (NB) is a malignant tumor originating from embryonal neural crest cells.
- NB and other developmental tumors are often characterized by blocked differentiation and growth arrest.
- In vivo differentiation of NB has clinical significance, prompting in vitro studies.
Purpose of the Study:
- To investigate the molecular events during in vitro retinoic acid (RA)-induced NB differentiation.
- To examine changes in proto-oncogene expression during NB cell differentiation.
- To understand the role of proto-oncogenes in cellular growth and maturation in NB.
Main Methods:
- Utilized in vitro induction of NB differentiation using retinoic acid (RA).
- Analyzed changes in the expression of various proto-oncogenes during NB cell differentiation.
- Investigated both transcriptional and post-transcriptional regulatory mechanisms.
Main Results:
- The expression of at least five proto-oncogenes (including c-Ha-ras, c-ets-1, c-fos) changed during NB cell differentiation.
- Expression of the c-erb-B proto-oncogene altered in conjunction with growth arrest during NB differentiation.
- Proto-oncogene expression changes were mediated by both transcriptional and post-transcriptional regulation.
Conclusions:
- Proto-oncogene expression is dynamically regulated during NB differentiation.
- Specific proto-oncogenes are involved in mediating differentiation and growth arrest in NB.
- Understanding these molecular changes may offer insights into NB pathogenesis and treatment.