Directly targeting the mitochondrial pathway of apoptosis for cancer therapy using BH3 mimetics - recent successes,

Kristopher A Sarosiek1,2, Anthony Letai3,4

  • 1Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA.

The FEBS Journal
|March 22, 2016
PubMed

Insights

Cancer cells

Area of Science:

  • Molecular biology
  • Cancer biology
  • Drug discovery

Background:

  • The BCL-2 protein family regulates apoptosis, crucial for cancer cell survival.
  • Cancer cells often up-regulate anti-apoptotic proteins (e.g., BCL-2, BCL-XL, MCL-1) to evade cell death.
  • This up-regulation can create a dependency on these proteins for cancer cell survival.

Purpose of the Study:

  • To review the progress, challenges, and future directions of BCL-2 family inhibitors in cancer therapy.
  • To highlight the therapeutic potential of targeting anti-apoptotic proteins in cancer.

Main Methods:

  • Review of recent scientific literature and clinical trial data.
  • Analysis of the mechanism of action for BH3 mimetics.
  • Discussion of cancer cell dependency on anti-apoptotic proteins.

Main Results:

  • The development of potent and specific BCL-2 family inhibitors (BH3 mimetics) is advancing.
  • These inhibitors are currently undergoing clinical evaluation.
  • Targeting anti-apoptotic proteins shows promise for cancer treatment.

Conclusions:

  • BCL-2 family inhibitors represent a promising therapeutic strategy for cancers.
  • Overcoming challenges in this field will be key to successful clinical deployment.
  • Targeting cancer cell survival mechanisms offers a viable path for novel anti-cancer drugs.

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...
9.1K
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...
16.7K
Targeted Cancer Therapies02:57

Targeted Cancer Therapies

The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against...
9.1K
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...
9.2K
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
19.5K
Combination Therapies and Personalized Medicine02:50

Combination Therapies and Personalized Medicine

Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
The combination of the drug acetazolamide and sulforaphane is a good example of combination therapy to treat cancer. The cells in the interior of a large tumor often die due to the hypoxic and...
6.3K