Tumor necrosis factor superfamily

A family of cytokines that can cause cell death

Mouse Tumor Necrosis Factor Alpha

Crystal structure of a TNF receptor

The tumor necrosis factor superfamily (TNFSF) is a group of cytokines that can cause cell death (apoptosis). These cytokines are involved in various cellular processes such as immune system regulation and inflammation. Members of this superfamily are characterized by their ability to bind to specific receptors, known as tumor necrosis factor receptors (TNFRs), which trigger signaling pathways leading to diverse cellular responses.

Structure

The TNF superfamily members are typically type II transmembrane proteins, although some can be cleaved to form soluble cytokines. They share a common structural motif known as the TNF homology domain, which is crucial for receptor binding. The receptors for these cytokines are type I transmembrane proteins that contain cysteine-rich domains in their extracellular regions, which are important for ligand binding.

Function

The primary role of TNFSF members is to regulate immune responses and inflammation. They are involved in the activation, proliferation, and differentiation of immune cells. For example, tumor necrosis factor alpha (TNF-_) is a key mediator of inflammation and is involved in the pathogenesis of various inflammatory diseases such as rheumatoid arthritis and inflammatory bowel disease.

Members

The TNF superfamily includes several well-known cytokines, such as:

• Tumor necrosis factor alpha (TNF-_)
• Fas ligand (FasL)
• CD40 ligand (CD40L)
• RANK ligand (RANKL)

Each of these cytokines interacts with specific receptors to mediate distinct biological effects. For instance, FasL binds to the Fas receptor to induce apoptosis, while CD40L interacts with CD40 to promote B cell activation and antibody production.

Clinical Significance

Dysregulation of TNFSF members and their receptors is associated with a variety of diseases, including autoimmune disorders, cancer, and infectious diseases. Therapeutic agents targeting TNF-_, such as monoclonal antibodies and receptor antagonists, have been developed to treat inflammatory conditions like rheumatoid arthritis and Crohn's disease.

Research

Ongoing research is focused on understanding the complex signaling pathways mediated by TNFSF members and their potential as therapeutic targets. Structural studies, such as those using X-ray crystallography, have provided insights into the interactions between TNFSF cytokines and their receptors, aiding in the design of novel drugs.

Related pages

• Cytokine
• Apoptosis
• Inflammation

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  Mouse Tumor Necrosis Factor Alpha
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  Tumor Necrosis Factor Superfamily