Role of Fas/Fas-L in vascular cell apoptosis

Victoria E A Stoneman1, Martin R Bennett

  • 1Division of Cardiovascular Medicine, University of Cambridge, Addenbrooke's Centre of Clinical Investigation, Addenbrooke's Hospital, Cambridge, UK. veas2@mole.bio.cam.ac.uk

Insights

Vascular cell apoptosis, triggered by Fas and Fas-ligand (Fas-L), is crucial in blood vessel development and disease. This review details the role and regulation of this cell death pathway in the vasculature.

Area of Science:

  • Vascular Biology
  • Cell Death Mechanisms
  • Immunology

Background:

  • Apoptosis (programmed cell death) is a fundamental process in vascular development and pathology.
  • All vascular wall cells undergo apoptosis, with outcomes varying by cell type and disease context.
  • The death receptor Fas and its ligand Fas-L are expressed in the vessel wall, mediating cell killing.

Purpose of the Study:

  • To review current understanding of Fas-Fas-L-induced apoptosis in vascular cells.
  • To explore the regulation of this apoptotic pathway in the vasculature.
  • To discuss the consequences of Fas-Fas-L signaling in vascular pathologies.

Main Methods:

  • Literature review of studies on vascular apoptosis and Fas-Fas-L signaling.
  • Analysis of research on cell death mechanisms in different vascular cell types.
  • Synthesis of findings on the role of Fas-Fas-L in vascular development and disease.

Main Results:

  • Fas-Fas-L-mediated apoptosis is a significant factor in vascular cell biology.
  • The pathway's impact is context-dependent, influenced by cell type and specific pathologies.
  • Understanding Fas-Fas-L regulation provides insights into vascular health and disease.

Conclusions:

  • Fas-Fas-L-induced apoptosis plays a critical role in vascular cell function and dysfunction.
  • Further research into this pathway can illuminate therapeutic strategies for vascular diseases.
  • The review highlights the complex involvement of programmed cell death in the vasculature.

Related Concept Videos

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...
Caspases01:24

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.
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.
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...
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.