Multiple cell death pathways as regulators of tumour initiation and progression

Marja Jäättelä1

  • 1Apoptosis Laboratory, Institute of Cancer Biology, Danish Cancer Society, Strandboulevarden 49, DK-2100 Copenhagen, Denmark. mhj@biobase.dk

Oncogene
|April 13, 2004
PubMed

Insights

Cancer cells often evade programmed cell death (PCD). Research highlights nonapoptotic PCD pathways, distinct from apoptosis, as crucial in preventing tumor growth and progression. Understanding these pathways offers new therapeutic avenues.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Death Research

Background:

  • Acquired defects in programmed cell death (PCD) pathways are hallmarks of cancer.
  • While apoptosis has been extensively studied, nonapoptotic PCD pathways are increasingly recognized for their role in tumor suppression.
  • Key cancer-related proteins like p53, c-Myc, and Bcl-2 regulate apoptosis, but novel regulators of nonapoptotic PCD are emerging.

Purpose of the Study:

  • To review the significance of nonapoptotic PCD in cancer.
  • To highlight newly identified regulators of nonapoptotic cell death.
  • To discuss the therapeutic implications of understanding these alternative cell death pathways.

Main Methods:

  • Literature review of recent findings on nonapoptotic PCD.
  • Analysis of molecular mechanisms regulating alternative cell death programs.
  • Synthesis of data on tumor suppressors and oncoproteins involved in PCD.

Main Results:

  • Nonapoptotic PCD acts as a barrier against tumor initiation and progression.
  • Numerous proteins, including tumor suppressors and oncoproteins, are identified as key regulators of nonapoptotic PCD.
  • These regulators are crucial in controlling alternative cell death pathways.

Conclusions:

  • Nonapoptotic PCD pathways are critical in cancer prevention.
  • The identification of novel regulators of nonapoptotic PCD opens new avenues for cancer research.
  • Understanding the molecular mechanisms of nonapoptotic PCD holds significant therapeutic potential for cancer treatment.

Related Concept Videos

Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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...
Overview of Cell Death01:30

Overview of Cell Death

Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the 20th century...
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...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...