Apoptosis modulation as a promising target for treatment of systemic sclerosis

Stéphane Chabaud1, Véronique J Moulin

  • 1Centre LOEX de l'Université Laval, Génie Tissulaire et Régénération, LOEX-Centre de Recherche FRSQ du Centre Hospitalier Affilié Universitaire de Québec, Quebec City, QC, Canada G1J 1Z4.

Insights

Diffuse systemic sclerosis (SSc) is a fatal autoimmune disease where apoptosis plays a key role in its progression. This review highlights apoptosis

Area of Science:

  • Immunology
  • Cell Biology
  • Rheumatology

Background:

  • Diffuse systemic sclerosis (SSc) is a severe autoimmune condition.
  • Characterized by excessive extracellular matrix (ECM) deposition, leading to organ damage.
  • Apoptosis, or programmed cell death, is implicated in SSc pathogenesis.

Purpose of the Study:

  • To review recent advancements in understanding apoptosis in SSc.
  • To elucidate the connection between apoptosis and fibrosis in SSc.
  • To identify novel therapeutic targets for SSc.

Main Methods:

  • Literature review of recent studies on apoptosis and SSc.
  • Analysis of the role of apoptosis in SSc-related fibrosis.
  • Identification of potential therapeutic strategies targeting apoptotic pathways.

Main Results:

  • Apoptosis is a critical process throughout SSc development, affecting vascular, immune, and fibrotic aspects.
  • Specific apoptotic pathways are linked to the excessive ECM deposition characteristic of SSc.
  • Understanding these links can reveal new therapeutic avenues.

Conclusions:

  • Apoptosis is a central mechanism in systemic sclerosis.
  • Targeting apoptotic pathways holds promise for treating SSc and its associated fibrosis.
  • Further research into apoptosis in SSc could lead to effective therapies.

Related Concept Videos

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.
Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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...
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...
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...
Phagocytosis of Apoptotic Cells01:17

Phagocytosis of Apoptotic Cells

Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
Normal cells contain receptors that prevent them from being recognized by phagocytes.