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Caspase-1 therefore plays a fundamental role in the innate immune system. The enzyme is responsible for processing cytokines such as pro-ILβ and pro-IL18, as well as secreting them. [22] Caspase-4 and -5 in humans, and Caspase-11 in mice have a unique role as a receptor, whereby it binds to LPS, a molecule abundant in gram negative bacteria ...
Caspase-9 has multiple additional cellular functions that are independent of its role in apoptosis. Nonapoptotic roles of caspase-9 include regulation of necroptosis, cellular differentiation, innate immune response, sensory neuron maturation, mitochondrial homeostasis, corticospinal circuit organization, and ischemic vascular injury. [9]
In normal cells, CDV activates caspase-8 first, which works as the initiator protein followed by the executioner protein caspase-3. [92] However, apoptosis induced by CDV in HeLa cells does not involve the initiator protein caspase-8. HeLa cell apoptosis caused by CDV follows a different mechanism than that in vero cell lines. [92]
Sequential activation of caspases plays a central role in the execution-phase of cell apoptosis. [8] Caspases exist as inactive proenzymes that undergo proteolytic processing at conserved aspartic residues to produce two subunits, large and small, that dimerize to form the active enzyme. This protein is processed by caspases 7, 8 and 10, and is ...
CARDs were originally characterized based on their involvement in the regulation of caspase activation and apoptosis. [2] The basic six-helix structure of the domain appears to be conserved as far back as the ced-3 and ced-4 genes in C. elegans, the organism in which several components of the apoptotic machinery were first characterized.
Caspase-3 has been found to be necessary for normal brain development as well as its typical role in apoptosis, where it is responsible for chromatin condensation and DNA fragmentation. [20] Elevated levels of a fragment of Caspase-3, p17, in the bloodstream is a sign of a recent myocardial infarction. [51]
Caspase-7 is a member of the caspase (cysteine aspartate protease) family of proteins, and has been shown to be an executioner protein of apoptosis.Sequential activation of caspases plays a central role in the execution-phase of cell apoptosis.
APO-1-mediated apoptosis can be inhibited by a variety of factors, including the viral caspase inhibitors CrmA and p35, as well as viral FLICE-inhibitory proteins known as v-FLIPs. When in the presence of APO-1, v-FLIPs preferentially bind and prevent procaspase-8 from being recruited; as such, apoptosis is stalled.