LIF Human, Sf9

Leukemia Inhibitory Factor Human Recombinant, Sf9
Cat. No.
BT19290
Source
Sf9, Baculovirus cells.
Synonyms

Leukemia Inhibitory Factor, Differentiation Inhibitory Activity, Cholinergic Differentiation Factor, Differentiation-Stimulating Factor, Hepatocyte-Stimulating Factor III, Differentiation-Inducing Factor, Melanoma-Derived LPL Inhibitor, Human Interleukin In DA Cells, D Factor, HILDA, MLPLI, Emfilermin, DIA, CDF, Leukemia inhibitory factor, LIF, Differentiation-stimulating factor, D factor, Melanoma-derived LPL inhibitor, MLPLI, Emfilermin.

Appearance
Sterile filtered colorless solution.
Purity
Greater than 90.0% as determined by SDS-PAGE.
Usage

THE BioTek's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.

Shipped with Ice Packs
In Stock

Description

LIF Human Recombinant produced in Sf9 Baculovirus cells is a single, glycosylated polypeptide chain containing 189 amino acids (23-202a.a.) and having a molecular mass of 20.8kDa (Molecular size on SDS-PAGE will appear at approximately 18-40kDa). LIF is expressed with a 6 amino acid His tag at C-Terminus and purified by proprietary chromatographic techniques.

Product Specs

Introduction
Leukemia Inhibitory Factor (LIF) is a protein that plays a role in maintaining embryonic stem cells and preventing them from differentiating. It also has other functions like supporting the growth of certain cell types and influencing bone and fat metabolism. The human and mouse versions of LIF are very similar.
Description
This product contains a recombinant human LIF protein produced in Sf9 insect cells. It's a single chain of 189 amino acids with a molecular weight of 20.8 kDa. The protein has a 6 amino acid His tag for purification and is purified using chromatography techniques.
Physical Appearance
Clear and colorless solution that is sterile.
Formulation
The LIF protein is supplied in a solution with a concentration of 0.25mg/ml. The solution also contains Phosphate Buffered Saline with a pH of 7.4 and 10% glycerol.
Stability
For short-term storage (up to 4 weeks), keep at 4°C. For longer periods, store frozen at -20°C. Adding a carrier protein like HSA or BSA (0.1%) is recommended for long-term storage. Avoid repeated freezing and thawing.
Purity
The purity of the LIF protein is greater than 90%, as determined by SDS-PAGE analysis.
Biological Activity
The biological activity of this LIF protein was measured using a cell proliferation assay with TF-1 human erythroleukemic cells. The ED50, which represents the concentration needed for half-maximal response, is less than or equal to 0.5 ng/ml.
Synonyms

Leukemia Inhibitory Factor, Differentiation Inhibitory Activity, Cholinergic Differentiation Factor, Differentiation-Stimulating Factor, Hepatocyte-Stimulating Factor III, Differentiation-Inducing Factor, Melanoma-Derived LPL Inhibitor, Human Interleukin In DA Cells, D Factor, HILDA, MLPLI, Emfilermin, DIA, CDF, Leukemia inhibitory factor, LIF, Differentiation-stimulating factor, D factor, Melanoma-derived LPL inhibitor, MLPLI, Emfilermin.

Source
Sf9, Baculovirus cells.
Amino Acid Sequence
ADPSPLPITP VNATCAIRHP CHNNLMNQIR SQLAQLNGSA NALFILYYTA QGEPFPNNLD KLCGPNVTDF PPFHANGTEK AKLVELYRIV VYLGTSLGNI TRDQKILNPS ALSLHSKLNA TADILRGLLS NVLCRLCSKY HVGHVDVTYG PDTSGKDVFQ KKKLGCQLLG KYKQIIAVLA
QAFHHHHHH.

Product Science Overview

Introduction

Leukemia Inhibitory Factor is a multifunctional cytokine that plays a crucial role in various biological processes. It is a member of the interleukin-6 cytokine family and is expressed in almost every tissue type within the body . The human recombinant form of Leukemia Inhibitory Factor, produced in Sf9 insect cells, has been widely used in research and therapeutic applications.

Discovery and Nomenclature

Leukemia Inhibitory Factor was first identified in the late 1960s when researchers observed that conditioned medium from normal cells could induce differentiation in murine myeloid leukemia cells . This factor was initially referred to as Differentiation Stimulating Factor or D-Factor. In 1987, Donald Metcalf and his team at the Walter and Eliza Hall Institute of Medical Research in Melbourne, Australia, isolated and characterized the protein, naming it Leukemia Inhibitory Factor due to its ability to inhibit the proliferation of leukemia cells .

Biological Functions

Leukemia Inhibitory Factor is known for its diverse biological functions. It can enforce differentiation and suppress clonogenic self-renewal in various myeloid leukemic cell lines . In normal embryonic stem cells, it prevents differentiation commitment, maintaining their pluripotency . Additionally, Leukemia Inhibitory Factor has significant effects on a wide range of other cells, including hepatic parenchymal cells, neurons, adipocytes, osteoblasts, and gonadal cells .

Mechanism of Action

Leukemia Inhibitory Factor exerts its effects by binding to a specific receptor complex on the cell surface, which includes the Leukemia Inhibitory Factor receptor and glycoprotein 130. This binding activates several intracellular signaling pathways, including the Janus kinase/signal transducer and activator of transcription pathway, the mitogen-activated protein kinase pathway, and the phosphatidylinositol 3-kinase pathway. These pathways mediate the diverse biological effects of Leukemia Inhibitory Factor, including cell differentiation, survival, and proliferation.

Applications in Research and Medicine

The human recombinant form of Leukemia Inhibitory Factor, produced in Sf9 insect cells, has been instrumental in various research and therapeutic applications. It is commonly used in the maintenance of pluripotency in embryonic stem cell cultures, allowing researchers to study stem cell biology and develop regenerative medicine therapies . Additionally, Leukemia Inhibitory Factor has potential therapeutic applications in treating conditions such as thrombocytopenia and myeloid leukemia .

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