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: Cell cycle regulation; Cytokine; Motility/polarity/chemotaxis; Secreted; Secreted, signal peptide
Cellular Component: extracellular region; extracellular space
Molecular Function: interleukin-4 receptor binding; protein binding
Biological Process: B cell differentiation; cellular defense response; chemotaxis; cholesterol metabolic process; connective tissue growth factor biosynthetic process; immune response; myeloid dendritic cell differentiation; negative regulation of apoptosis; negative regulation of osteoclast differentiation; negative regulation of transcription, DNA-dependent; positive regulation of B cell proliferation; positive regulation of interleukin-13 production; positive regulation of isotype switching to IgE isotypes; positive regulation of isotype switching to IgG isotypes; positive regulation of MHC class II biosynthetic process; positive regulation of T cell differentiation; positive regulation of T cell proliferation; positive regulation of transcription from RNA polymerase II promoter; positive regulation of transcription, DNA-dependent; regulation of immune response; regulation of isotype switching; regulation of phosphorylation; T-helper 2 type immune response