Getting back on track, or what to do when apoptosis is de-railed: recoupling oncogenes to the apoptotic machinery

Howard O Fearnhead1

  • 1Apoptosis Section, Regulation of Cell Growth Laboratory, NCI-Frederick, Maryland 21702, USA. hfearnhead@ncifcrf.gov

Cancer Biology & Therapy
|January 17, 2004
PubMed

Insights

Cancer cells evade programmed cell death (apoptosis) through oncogene mutations, leading to drug resistance. Understanding these links is key to developing new cancer therapies targeting apoptosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Death Research

Background:

  • Programmed cell death (apoptosis) is crucial in limiting cancer development and is a target for chemotherapy.
  • Oncogenes that disrupt cell cycle control often induce apoptosis, eliminating abnormal cells.
  • Cancer cells acquire mutations to evade apoptosis, promoting uncontrolled growth and drug resistance.

Purpose of the Study:

  • To review how oncogenes activate apoptosis.
  • To examine the mechanisms by which cancer cells subvert apoptotic pathways.
  • To discuss therapeutic strategies targeting these apoptosis-related changes in cancer.

Main Methods:

  • Literature review of oncogene function in apoptosis.
  • Analysis of genetic mutations compromising apoptotic pathways in cancer.
  • Synthesis of current and proposed therapeutic approaches.

Main Results:

  • Oncogenes are intrinsically linked to apoptosis activation.
  • Cancer cells develop resistance by disabling apoptotic signaling.
  • Therapeutic strategies aim to restore or exploit apoptotic pathways.

Conclusions:

  • Understanding the oncogene-apoptosis axis is vital for cancer progression insights.
  • Targeting apoptosis offers a promising avenue for overcoming chemo-resistance in malignancies.
  • Developing novel therapies that re-engage apoptosis is central to effective cancer treatment.

Related Concept Videos

The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
Apoptosis01:30

Apoptosis

Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
Anaphase Promoting Complex00:50

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...