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Genomic components of carcinogenesis

R Schmandt1, G B Mills

  • 1Toronto General Hospital, Ontario, Canada.

Clinical Chemistry
|November 1, 1993
PubMed
Summary

Protooncogenes regulate cell growth but can become oncogenes when mutated, driving cancer. Tumor cells evade cell death and bypass growth suppressors, leading to uncontrolled proliferation and genomic alterations.

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Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • Protooncogenes are essential for normal cell growth, regulating factors like growth factors and enzymes.
  • Oncogenes, derived from protooncogenes, are altered through mutation or overexpression, contributing to cellular transformation.
  • Programmed cell death (apoptosis) is a normal cellular process regulated by specific mediators, which can be bypassed in tumor cells.

Purpose of the Study:

  • To elucidate the molecular mechanisms differentiating protooncogenes from oncogenes.
  • To explain how tumor cells evade apoptosis and uncontrolled proliferation.
  • To highlight the role of tumor suppressors in cell cycle regulation and cancer development.

Main Methods:

  • Comparative analysis of gene expression and function in normal versus tumor cells.
  • Investigation of molecular pathways regulating cell division, apoptosis, and cell cycle progression.
  • Examination of genetic alterations, including mutations and deletions, in tumor suppressor genes and oncogenes.

Main Results:

  • Oncogenes result from mutations, overexpression, or inappropriate expression of protooncogenes.
  • Tumor cells exhibit dysfunctional apoptosis pathways or overactive survival mediators.
  • Tumor suppressor genes, crucial for limiting proliferation, are frequently inactivated in cancer cells.

Conclusions:

  • Cancer arises from a complex interplay of activated oncogenes, inactivated tumor suppressors, and bypassed apoptosis.
  • Aberrant regulation of cell division, cell cycle, and cell survival characterizes tumor cells.
  • Targeting oncogene pathways and their associated biochemical mechanisms represents a promising strategy for antitumor therapies.

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