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I9401 Sigma-Aldrich

Interleukin-1β human

IL-1β, recombinant, expressed in E. coli, lyophilized powder, cell culture tested

Synonym: IL-1β, Lymphocyte activating factor




5, 25 μg in poly bottle

Biochem/physiol Actions

Interleukin-1 (IL-1), originally known as Lymphocyte Activating Factor (LAF), activates T cell lymphocytes, which then proliferate and secrete interleukin-2 (IL-2). IL-1 is released primarily from stimulated macrophages and monocytes, but has also been shown to be released from several other types and is thought to play a key role in inflammatory and immune responses. Other synonyms for IL-1 include: endogenous pyrogen (EP), mitogenic protein (MP), Helper Peak-1 (HP-1), T Cell Replacing Factor III (TRF III or TRFM), B Cell Activating Factor (BAF) and B Cell Differentiation Factor (BDF) The two closely related agents Interleukin-1α (IL-1α) and Interleukin-1β (IL-1β) share 62% homology in amino acid sequence and elicit nearly identical biological responses. IL-1α and IL-1β are both approximately 17 kDa with some heterogeneity in the amount of glycosylation.

Physical form

Lyophilized from a 0.2 μm filtered buffered solution.

Analysis Note

The biological activity is measured by the dose-dependent stimulation of MTS cleavage by murine D10S cells.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis


Certificate of Origin


Request a Serum Sample

Cell Culture Guide
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

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