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Tumor necrosis factor (TNF), formerly known as TNF-α, is a chemical messenger produced by the immune system that induces inflammation. [5] TNF is produced primarily by activated macrophages , and induces inflammation by binding to its receptors on other cells. [ 6 ]
The tumor necrosis factor (TNF) superfamily is a protein superfamily of type II transmembrane proteins containing TNF homology domain and forming trimers. Members of this superfamily can be released from the cell membrane by extracellular proteolytic cleavage and function as a cytokine .
They include interleukin-1 (IL-1), IL-6, IL-12, and IL-18, tumor necrosis factor alpha (TNF-α), interferon gamma (IFNγ), and granulocyte-macrophage colony stimulating factor (GM-CSF) and play an important role in mediating the innate immune response. Inflammatory cytokines are predominantly produced by and involved in the upregulation of ...
Lymphotoxin alpha, a member of the tumor necrosis factor superfamily, is a cytokine produced by lymphocytes. LT-α 1-β 2 can interact with receptors such as LT-β receptors. [12] Absence of LT-β on cell surfaces will diminish the ability of LT-α to form LT-α 1-β 2, thus decreasing its effective ability as a cytokine.
Lymphotoxin administers a variety of activation signals in the innate immune response. LT-α is necessary for the expression of LT-α1-β2 on the cell surface as LT-α aids in the movement of LT-β to the cell surface to form LT-α1-β2. [5] In the LT-α mediated signaling pathway, LT-α binds with LT-β to form the membrane-bound LT-α1-β2 ...
Macrophages can contribute to tumor growth and progression by promoting tumor cell proliferation and invasion, fostering tumor angiogenesis and suppressing antitumor immune cells. [94] [95] Inflammatory compounds, such as tumor necrosis factor (TNF)-alpha released by the macrophages activate the gene switch nuclear factor-kappa B.
Peripheral immune cells are called to the site of injury via these cytokines and may now migrate across the compromised blood brain barrier into the brain. Common cytokines produced in response to brain injury include: interleukin-6 (IL-6), which is produced during astrogliosis, and interleukin-1 beta (IL-1β) and tumor necrosis factor alpha ...
The tumor necrosis factor receptor superfamily (TNFRSF) is a protein superfamily of cytokine receptors characterized by the ability to bind tumor necrosis factors (TNFs) via an extracellular cysteine-rich domain. [2] [3] With the exception of nerve growth factor (NGF), all TNFs are homologous to the archetypal TNF-alpha. [4]