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Description:
IL-4 is a pleiotropic cytokine that regulates diverse T ａnd B cell responses including cell proliferation, survival ａnd gene expression. Produced by mast cells, T cells ａnd bone marrow stromal cells, IL-4 regulates the differentiation of naive CD4+ T cells into helper Th2 cells, characterized by their cytokine-secretion profile that includes secretion of IL-4, IL-5, IL-6, IL-10, ａnd IL-13, which favor a humoral immune response. Another dominant function of IL-4 is the regulation of immunoglobulin class switching to the IgG1 ａnd IgE isotypes. Excessive IL-4 production by Th2 cells has been associated with elevated IgE production ａnd allergy. Recombinant human IL-4 is a 14.9 kDa globular protein containing 129 amino acid residues.
AA Sequence:
MHKCDITLQE IIKTLNSLTE QKTLCTELTV TDIFAASKNT TEKETFCRAA TVLRQFYSHH EKDTRCLGAT AQQFHRHKQL IRFLKRLDRN LWGLAGLNSC PVKEANQSTL ENFLERLKTI MREKYSKCSS
Source:
E.coli
Purity:
Greater than 98% by SDS-PAGE gel ａnd HPLC analyses.
Biological Activity:
The ED50 as determined by the dose-dependent stimulation of human TF-1 cells is ≤ 0.2 ng/ml, corresponding to a specific activity of ≥ 5 x 106 units/mg
