GM CSF Human

Granulocyte Macrophage-Colony Stimulating Factor Human Recombinant
Cat. No.
BT596
Source
Escherichia Coli.
Synonyms

CSF-2, MGI-1GM, GM-CSF, Pluripoietin-alpha, MGC131935, MGC138897.

Appearance
Sterile Filtered White lyophilized (freeze-dried) powder.
Purity
Greater than 98.0% as determined by:
1. Analysis by RP-HPLC.
2. Analysis 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

Granulocyte Macrophage Colony Stimulating Factor Human Recombinant produced in E.Coli is a single, non-glycosylated, polypeptide chain containing 127 amino acids and having a molecular mass of 14477 Dalton. GM-CSF is purified by proprietary chromatographic techniques.

Product Specs

Introduction

Granulocyte-macrophage colony-stimulating factor (GM-CSF) is a cytokine that stimulates the production of white blood cells. It is produced naturally by the body in response to infection or injury, and it can also be produced in the laboratory. GM-CSF is used to treat a variety of conditions, including cancer, AIDS, and bone marrow transplantation. It is also being studied as a treatment for other conditions, such as Crohn's disease and rheumatoid arthritis.

Description
Recombinant human granulocyte-macrophage colony-stimulating factor (GM-CSF) is a 127-amino acid protein produced in E. coli. This non-glycosylated protein has a molecular weight of 14.477 kDa and is purified using proprietary chromatographic techniques.
Physical Appearance
Sterile white lyophilized powder.
Formulation
The protein was lyophilized following extensive dialysis against 2mM sodium phosphate buffer with a pH of 7.4 ± 0.1.
Solubility
Reconstitute the lyophilized GM-CSF in sterile 18 MΩ-cm H2O to a concentration of at least 100 µg/ml. This solution can be further diluted in other aqueous solutions.
Stability
Lyophilized GM-CSF is stable at room temperature for 3 weeks but should be stored desiccated below -18°C. Reconstituted GM-CSF should be stored at 4°C for 2-7 days or below -18°C for long-term storage. The addition of a carrier protein (0.1% HSA or BSA) is recommended for long-term storage. Avoid freeze-thaw cycles.
Purity
Purity is determined by the following methods and exceeds 98.0%:
1. Reverse-phase high-performance liquid chromatography (RP-HPLC)
2. Sodium dodecyl-sulfate polyacrylamide gel electrophoresis (SDS-PAGE)
Biological Activity
The ED50, determined by the dose-dependent stimulation of human TF-1 cell proliferation (human erythroleukemic indicator cell line), is less than 0.1 ng/ml. This corresponds to a specific activity of 11,100,000 IU/mg.
Protein Content
GM-CSF concentration was determined using two independent methods:
1. UV spectroscopy at 280 nm using an absorbance value of 0.963 as the extinction coefficient for a 0.1% (1 mg/ml) solution. This value is calculated using the PC GEN computer analysis program for protein sequences (IntelliGenetics).
2. RP-HPLC analysis using a standard solution of GM-CSF as a reference standard.
Synonyms

CSF-2, MGI-1GM, GM-CSF, Pluripoietin-alpha, MGC131935, MGC138897.

Source
Escherichia Coli.
Amino Acid Sequence
The sequence of the first five N-terminal amino acids was determined and was found to be Ala-Pro-Ala-Arg-Ser.
N-terminal methionine has been completely removed enzymatically.

Product Science Overview

Introduction

Granulocyte Macrophage-Colony Stimulating Factor (GM-CSF) is a cytokine that plays a crucial role in the regulation of immune responses. It is produced by various cell types, including activated T cells, NK cells, macrophages, endothelial cells, and fibroblasts . The recombinant form of human GM-CSF (rhu GM-CSF) is used in clinical settings to stimulate the production of white blood cells and enhance immune functions.

Biological Properties

GM-CSF is a glycoprotein that functions by binding to its specific receptor on the surface of target cells. This binding activates intracellular signaling pathways that lead to the proliferation, differentiation, and survival of hematopoietic progenitor cells . GM-CSF primarily targets granulocyte and monocyte precursors, as well as subsets of differentiated myeloid cells .

Expression Patterns and Tissue Distribution

GM-CSF is produced in response to cytokine or immune and inflammatory stimulation. It is secreted by a variety of cells, including T cells, B cells, macrophages, mast cells, endothelial cells, and fibroblasts . The expression of GM-CSF is tightly regulated and occurs in specific tissues where immune responses are needed.

Biological Functions

The primary function of GM-CSF is to stimulate the production and function of granulocytes and macrophages. These cells are essential for the body’s defense against infections and play a critical role in the inflammatory response . GM-CSF also enhances the survival and function of mature myeloid cells, contributing to the overall immune response.

Modes of Action

GM-CSF exerts its effects by binding to the GM-CSF receptor, which is composed of an alpha and a beta subunit. This binding triggers a cascade of intracellular signaling events, including the activation of the JAK-STAT pathway, which leads to the transcription of genes involved in cell proliferation, differentiation, and survival .

Regulatory Mechanisms

The production and activity of GM-CSF are regulated by various factors, including cytokines, growth factors, and cellular interactions. Negative feedback mechanisms ensure that GM-CSF levels are kept in check to prevent excessive inflammation and tissue damage .

Clinical Applications

Recombinant human GM-CSF (rhu GM-CSF), also known as sargramostim, has been approved by the US FDA for use in various clinical settings. It is used to accelerate bone marrow recovery in patients undergoing bone marrow transplantation or chemotherapy . Additionally, rhu GM-CSF has shown promise in enhancing anti-cancer responses when combined with conventional therapies .

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