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Cytokines (/ ˈ s aɪ t ə k aɪ n /) [1] are a broad and loose category of small proteins (~5–25 kDa [2]) important in cell signaling. Due to their size, cytokines cannot cross the lipid bilayer of cells to enter the cytoplasm and therefore typically exert their functions by interacting with specific cytokine receptors on the target
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For example, cytokinins have been described to induce resistance against Pseudomonas syringae in Arabidopsis thaliana [15] and Nicotiana tabacum. [16] Also in context of biological control of plant diseases cytokinins seem to have potential functions.
Chemokines (from Ancient Greek χῠμείᾱ (khumeíā) 'alchemy' and κῑ́νησῐς (kī́nēsis) 'movement'), or chemotactic cytokines, are a family of small cytokines or signaling proteins secreted by cells that induce directional movement of leukocytes, as well as other cell types, including endothelial and epithelial cells.
Lymphokines are a subset of cytokines that are produced by a type of immune cell known as a lymphocyte. [1] They are protein mediators typically produced by T cells to direct the immune system response by signaling between its cells.
Interleukin 3 (IL3) is a cytokine that regulates hematopoiesis by controlling the production, differentiation and function of granulocytes and macrophages. [15] [16] The protein, which exists in vivo as a monomer, is produced in activated T cells and mast cells, [15] [16] and is activated by the cleavage of an N-terminal signal sequence. [16]
An inflammatory cytokine is a type of cytokine (a signaling molecule) that is secreted from immune cells and certain other cell types that promotes inflammation. Inflammatory cytokines are predominantly produced by T helper cells ( T h ) and macrophages and involved in the upregulation of inflammatory reactions. [ 1 ]
In general, monocytes and their macrophage and dendritic cell progeny serve three main functions in the immune system. These are phagocytosis, antigen presentation, and cytokine production. Phagocytosis is the process of uptake of microbes and particles followed by digestion and destruction of this material.