I4269 Sigma

Interleukin-4 human

IL-4, recombinant, expressed in E. coli, lyophilized powder, suitable for cell culture

Synonym: IL-4, hIL-4



Related Categories Cancer Research, Cell Biology, Cell Culture, Cell Signaling and Neuroscience, Core Bioreagents,
recombinant   expressed in E. coli
assay   ≥98% (SDS-PAGE)
form   lyophilized powder
quality   endotoxin tested
mol wt   mol wt 14.9 kDa (containing 129 amino acid residues)
suitability   suitable for cell culture
storage temp.   −20°C
Gene Information   human ... IL4(3565)
mouse ... IL4(3565)


Analysis Note

The biological activity is measured by the dose-dependent stimulation of the proliferation of human TF-1 cells.


Lymphokine with profound effects on the growth and differentiation of immunologically competent cells, inhibits VEGF-induced and βFGF-induced angiogenesis.

Physical form

Lyophilized from a sterile filtered solution.

General description

Interleukin-4 (IL-4) is a pleiotropic cytokine that regulates diverse T and B cell responses including differentiation of naive T cells into the TH2 phenotype, promoting B cell proliferation, antibody isotype switching, and expression of other TH2 cytokines including IL-5 and IL-9.1,2 IL-4 plays a critical role in the development of allergic inflammation and asthma.3

IL-4 binds to two distinct receptors; the type I receptor, a heterodimer consisting of the IL-4Rα chain and the common gamma chain, γc, and the type II receptor, a heterodimer of IL-4Rα and IL-13Rα1.4

Naturally occurring IL-4 has a molecular mass of 12-20 kDa. Recombinant human IL-4 is a 14.9 kDa protein containing 129 amino acid residues. Human and mouse IL-4 share a 50% amino acid sequence homology, but their biological actions are species-specific.5


1. Paul, W.E., Interleukin-4: a prototypic immuno-regulatory lymphokine. Blood, 77, 1859-1870 (1991).
2. O′Garra, A., and Arai, N., The molecular basis of T helper 1 and T helper 2 cell differentiation. Trends Cell Biol., 10, 542-550 (2000).
3. Ryan, J.J. et al., Mast cell homeostasis: a fundamental aspect of allergic disease. Crit. Rev. Immunol., 27, 15-32 (2007).
4. Callard, R.E. et al., IL-4 and IL-13 receptors: are they one and the same? Immunol. Today, 17, 108-110 (1996).
5. Yokota, T. et al., Molecular biology of interleukin 4 and interleukin 5 genes and biology of their products that stimulate B cells, T cells and hemopoietic cells. Immunol. Rev., 102, 137-187 (1988).
6. Kitamura, T. et al., Establishment and characterization of a unique human cell line that proliferates dependently on GM-CSF, IL-3, or erythropoietin. J. Cell Physiol., 140, 323-334 (1989).

Price and Availability

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Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Protocols & Articles


Interleukin Family (IL)

The Interleukins comprise a disparate group of cytokines and growth factors that are produced by and released from leukocytes. Interleukin-1β (1L-1β) is released primarily from stimulated macrophages...
Jennifer Fries
BioFiles 2009, 4.5, 16.
Keywords: Anti-inflammatory agents, Antitumor agents, Cancer, Cell proliferation, Gene expression, Growth factors, Transcription

Peer-Reviewed Papers


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