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Protein Page:
IL4 (human)

IL4 Participates in at least several B-cell activation processes as well as of other cell types. It is a costimulator of DNA-synthesis. It induces the expression of class II MHC molecules on resting B-cells. It enhances both secretion and cell surface expression of IgE and IgG1. It also regulates the expression of the low affinity Fc receptor for IgE (CD23) on both lymphocytes and monocytes. Genetic variations in IL4 may be a cause of susceptibility to ischemic stroke (ISCHSTR); also known as cerebrovascular accident or cerebral infarction. A stroke is an acute neurologic event leading to death of neural tissue of the brain and resulting in loss of motor, sensory and/or cognitive function. Ischemic strokes, resulting from vascular occlusion, is considered to be a highly complex disease consisting of a group of heterogeneous disorders with multiple genetic and environmental risk factors. Belongs to the IL-4/IL-13 family. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: Secreted, signal peptide; Cell cycle regulation; Motility/polarity/chemotaxis; Secreted; Cytokine
Chromosomal Location of Human Ortholog: 5q31.1
Cellular Component: extracellular space; external side of plasma membrane
Molecular Function: protein binding; growth factor activity; cytokine activity; interleukin-4 receptor binding
Biological Process: regulation of isotype switching; negative regulation of osteoclast differentiation; positive regulation of isotype switching to IgG isotypes; positive regulation of transcription, DNA-dependent; regulation of proton transport; microglial cell activation; female pregnancy; positive regulation of activated T cell proliferation; chemotaxis; response to organic cyclic substance; positive regulation of isotype switching to IgE isotypes; positive regulation of interleukin-10 production; B cell costimulation; connective tissue growth factor biosynthetic process; positive regulation of MHC class II biosynthetic process; positive regulation of B cell proliferation; positive regulation of T cell proliferation; positive regulation of interleukin-13 production; negative regulation of macrophage activation; response to nutrient; response to drug; cholesterol metabolic process; negative regulation of chronic inflammatory response; regulation of immune response; T-helper 2 type immune response; regulation of phosphorylation; negative regulation of nitric oxide biosynthetic process; negative regulation of acute inflammatory response; positive regulation of mast cell degranulation; defense response to protozoan; T-helper 1 cell lineage commitment; positive regulation of chemokine biosynthetic process; response to ethanol; positive regulation of T cell differentiation; innate immune response in mucosa; positive regulation of tyrosine phosphorylation of Stat5 protein; retina development in camera-type eye; B cell differentiation; response to cytokine stimulus; cellular defense response; positive regulation of transcription from RNA polymerase II promoter; immune response; positive regulation of transcription factor activity; T-helper 2 cell differentiation; negative regulation of transcription, DNA-dependent; positive regulation of defense response to virus by host; negative regulation of apoptosis
Disease: Stroke, Ischemic
Reference #:  P05112 (UniProtKB)
Alt. Names/Synonyms: B cell growth factor 1; B cell stimulatory factor 1; B-cell stimulatory factor 1; BCGF-1; BCGF1; BSF1; IL-4; interleukin 4
Gene Symbols: IL4
Molecular weight: 17,492 Da
Basal Isoelectric point: 9.17  Predict pI for various phosphorylation states
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
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Protein Structure Not Found.

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Modification Sites and Domains  

Modification Sites in Parent Protein, Orthologs, and Isoforms  

Show Multiple Sequence Alignment


LTP: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.


HTP: The number of records in which this modification site was assigned using ONLY proteomic discovery-mode mass spectrometry.




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