Glutathione and the regulation of cell death

A G Hall1

  • 1Cancer Research Unit, Newcastle University, Newcastle Upon Tyne, United Kingdom.

Insights

Elevated glutathione and glutathione S-transferases are linked to alkylating agent resistance. Recent discoveries revive interest, highlighting redox balance in cell death and drug transport.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • The link between elevated glutathione (GSH) and glutathione S-transferases (GSTs) and resistance to alkylating agents was established over a decade ago.
  • Research interest in this area had declined, shifting focus to other drug resistance mechanisms.
  • Recent discoveries have reignited interest by implicating redox balance in regulating cell death and transmembrane drug transport.

Purpose of the Study:

  • To review recent advances in the study of glutathione and glutathione-utilizing enzymes.
  • To highlight the renewed interest in GSH and GSTs in the context of drug resistance and cellular processes.

Main Methods:

  • Literature review focusing on recent publications (past 3-4 years).
  • Synthesis of findings related to glutathione, glutathione S-transferases, redox balance, cell death, and drug transport.

Main Results:

  • Glutathione and glutathione S-transferases play a significant role in alkylating agent resistance.
  • Redox balance is increasingly recognized as a key regulator of crucial cellular functions.
  • Advances in understanding transmembrane drug transport are linked to redox status.

Conclusions:

  • The study of glutathione and its associated enzymes remains relevant for understanding drug resistance.
  • Redox balance is a critical factor influencing cell fate and drug efficacy.
  • Further research into these pathways may yield new therapeutic strategies.

Related Concept Videos

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...
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...
Autophagic Cell Death01:18

Autophagic Cell Death

Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation01:22

Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation

Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
Several distinctive characteristics distinguish glutathione conjugation from other phase II...
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...