Related Experiment Videos
Apoptosis in liver disease
1Department of Internal Medicine I, Johannes Gutenberg University, Mainz, Germany.
Abstract:
A variety of biological functions are regulated through extracellular signals. Amongst the best studied examples is growth control, which is achieved by the regulatory function of growth factors. In recent years it has become apparent that cell death (apoptosis) is controlled in a similar fashion.Apoptosis, firstly a morphologically defined process, is a highly controlled type of cell death that plays a critical role in embryonic development, deletion of autoreactive T-cells and adult tissue homoeostasis. There is increasing evidence that derangement of the apoptotic program is the underlying cause of a series of diseases including liver diseases. The deadly program can be initiated by ligand binding to membrane bound receptors such as CD95 (Fas), which is the most prominent cell death inducing member of the TNF receptor superfamily. The core of the subsequently activated intracellular machinery is formed by a set of proteases, namely caspases. Once activated, they orchestrate the complete destruction of the cellular skeleton leading to the typical apoptotic morphology. This review focuses on the underlying mechanism leading to derangement of the usually highly controlled apoptotic program in different liver diseases.
Insights
Apoptosis, a controlled cell death process, is crucial for tissue health. Dysregulation of apoptosis contributes to liver diseases, involving specific cell receptors and caspases.
Area of Science:
- Molecular Biology
- Cell Biology
- Pathology
Background:
- Extracellular signals regulate biological functions, including growth control by growth factors.
- Cell death, or apoptosis, is a highly controlled process vital for development, immune regulation, and tissue homeostasis.
- Aberrant apoptosis is increasingly implicated in various diseases, notably liver diseases.
Purpose of the Study:
- To review the mechanisms underlying the derangement of the apoptotic program in liver diseases.
- To highlight the role of specific cell death pathways in liver pathology.
Main Methods:
- Review of existing literature on apoptosis, cell death receptors, and caspases.
- Focus on the molecular mechanisms initiating apoptosis via receptors like CD95 (Fas).
- Analysis of how caspase activation leads to cellular destruction.
Main Results:
- Apoptosis is initiated by ligand binding to membrane receptors, such as CD95 (Fas) from the TNF receptor superfamily.
- Activated caspases form the core intracellular machinery, orchestrating cellular dismantling.
- Disruption of this tightly regulated apoptotic program is a key factor in liver disease pathogenesis.
Conclusions:
- The apoptotic pathway is a critical target for understanding and potentially treating liver diseases.
- Understanding the molecular basis of apoptosis dysregulation is essential for addressing liver pathologies.
- Further research into the specific mechanisms of apoptosis derangement in liver disease is warranted.