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To Purchase # 8911SC

8911SC 10 µg (With Carrier) $199.00
8911SF 10 µg (Carrier Free) $199.00
8911LC 50 µg (With Carrier) $599.00
8911LF 50 µg (Carrier Free) $599.00
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Source / Purification

Recombinant human LIF (hLIF) Ser23-Phe202 (Accession #P15018) was produced in E. coli at Cell Signaling Technology.

Product Description

Purity:

>98% as determined by SDS-PAGE of 6 μg reduced (+) and non-reduced (-) recombinant hLIF. All lots are greater than 98% pure.


Molecular Formula:

Based on amino acid sequencing, greater than 30% of recombinant hLIF has a Met on the amino-terminal Ser23 (MSPLP) and has a calculated MW of 19,847. The remainder starts at Ser23 (SPLPI), Pro24 (PLPIT), or Pro26 (PITPV). DTT-reduced protein migrates as a 20 kDa polypeptide and non-reduced protein migrates as a 17 kDa polypeptide due to intramolecular cystines.


Bioactivity:

The bioactivity of recombinant hLIF was determined in a TF-1 cell proliferation assay. The ED50 of each lot is between 0.2-1.5 ng/ml.


Endotoxin:

Less than 0.01 ng endotoxin/1 μg hLIF.


Product Usage Information

Formulation:

With carrier: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2 containing 20 μg BSA per 1 μg hLIF. Carrier free: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2.


Storage: Stable in lyophilized state at 4°C for 1 year after receipt. Sterile stock solutions reconstituted with carrier protein are stable at 4°C for 2 months and at -20°C for 6 months. Avoid repeated freeze-thaw cycles.Maintain sterility. Storage at -20°C should be in a manual defrost freezer.

Leukemia Inhibitory Factor (LIF) is a 20 kDa pleiotrophic factor belonging to the IL-6 superfamily of cytokines (1). LIF is expressed in a number of tissues and cell types. The LIF receptor is a heterodimer comprised of LIF-R (gp190) and gp130, a common signal transducer for IL-6-type cytokines (1). Depending on cell type and context, LIF/LIF-R can activate Erk, PI3K, and Jak1/Stat1/3 pathways (1,2). LIF has a diverse array of biological activities. Murine embryonic stem cells are dependent on LIF for pluripotency and self-renewal in vitro (1). Exercise- induced LIF secretion in muscle induces myoblast proliferation, suggesting that LIF may play a role in exercise-induced muscle hypertrophy (2). LIF also negatively regulates Th2 and Th17 cell differentiation (3,4).


1.  Mathieu, M.E. et al. (2012) Stem Cell Rev 8, 1-15.

2.  Broholm, C. and Pedersen, B.K. (2010) Exerc Immunol Rev 16, 77-85.

3.  Cao, W. et al. (2011) Immunity 35, 273-84.

4.  Ullah, U. et al. (2012) Sci Rep 2, 464.


Entrez-Gene Id 3976
Swiss-Prot Acc. P15018


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.