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L6529 Sigma-Aldrich

Lipopolysaccharides from Escherichia coli O55:B5

γ-irradiated, BioXtra, suitable for cell culture

Synonym: LPS

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Properties

Related Categories Bacteria-derived adjuvants, Biochemicals and Reagents, Cell Biology, Cell Culture, Cell Signaling and Neuroscience,
Quality Level   300
sterility   γ-irradiated
product line   BioXtra
form   lyophilized powder
purified by   gel-filtration chromatography
application(s)   cell culture | mammalian: suitable
impurities   <3% Protein (Lowry)
solubility   H2O: 5 mg/mL, faintly hazy to hazy
storage temp.   2-8°C

Description

General description

Lipopolysaccharides (LPS) are complex glycolipids that contain several components. Enterobacteriaceae, such as E. coli, have highly conserved lipid A linked to the antigenic O-polysaccharide. Hydrophobic lipid A forms the outer most component that plays a role in the biological properties attributed to endotoxic LPS. A short core oligosaccharide (core OS) is found to be attached to lipid A. Enterobacteria contain an antigenic, repeat-structure O-polysaccharide (O-PS) attached to the distal core OS to form smooth LPS. O-PS in E. coli contains ∼170 distinct antigens that interact with the host immune system. Based on the core OS structures in E. coli, they have been designated K-12 and R1 to R4.

Application

LPS (lipopolysaccharide) from Escherichia coli 055:B5 has been used:
• to stimulate human PBMC to secrete cytokine.
• to stimulate wild type embryonic fibroblasts and mutants for the induction of phosphorylation of p56
• in the measurement of tumor necrosis factor-α levels and nuclear factor-κB p65 activities after stimulation
• in the stimulation of hamster lymphocytes in vitro
• to induce activated dendritic morphology in murine macrophage cell line in a study

Lipopolysaccharides (LPSs) are characteristic components of the cell wall of Gram-negative bacteria. LPS and its lipid A moiety stimulate cells of the innate immune system by the Toll-like receptor 4 (TLR4), a member of the Toll-like receptor protein family, which recognizes common pathogen-associated molecular-patterns (PAMPs).

Biochem/physiol Actions

LPS (lipopolysaccharide) is a major constituent of the outer membrane of most gram negative bacteria. It is a highly immunogenic antigen with the ability to enhance immune responses to soluble antigens. The LPS confers antigenic and endotoxic characters to the bacteria. They are also important in resistance to infection by phages.

Reconstitution

Lipopolysaccharides are supplied as lyophilized, γ-irradiated powders. To reconstitute, add 1 ml sterile balanced salt solution or tissue culture medium to the vial (1 mg) and gently swirl until the powder dissolves. Reconstituted product may be further diluted to desired working concentrations using sterile balanced salt solution or tissue culture medium.

Safety & Documentation

Safety Information

Symbol 
GHS06  GHS06
Signal word 
Danger
Hazard statements 
Precautionary statements 
Personal Protective Equipment 
RIDADR 
NONH for all modes of transport
WGK Germany 
WGK 3
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable

Documents

Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles

Articles

Choosing the optimal vaccine adjuvant

The word "vaccination" was first coined by English scientist Edward Jenner in 1796, although early forms of vaccination have been documented as far back as the 17th century.1 Vaccination is used to g...
BioFiles Vol. 5, No. 3
Keywords: Cancer, Clinical, Diseases, Inflammation, Veterinary

Human Microbiome Research Workflow: An Overview of the Role in Human Health and Disease

Previously, the study of human microbiology was based on identification, isolation and culture of single microbes, such as bacteria, fungi and viruses. Scientists collected these organisms from patie...
Keywords: Amplification, Antibiotics, Antifungals, Cell culture, Cell disruption, Clinical, Diabetes, Digestions, Diseases, Environmental, Gas chromatography, Gas chromatography mass spectrometry, Gastrointestinal, Genetics, Genomics, High performance liquid chromatography, Liquid chromatography mass spectrometry, Mass spectrometry, Metabolites, Metabolomics, Microbiology, Nutrition, Obesity, Polymerization reactions, Proteomics, Respiratory, Sample preparations, Separation, Sequencing

Protocols

Lipopolysaccharides (LPS)

Lipopolysaccharides (LPS) are characteristic components of the cell wall of Gram negative bacteria; they are not found in Gram positive bacteria. They are localized in the outer layer of the membrane...
Keywords: Adsorption, Antibiotics, Cell culture, Cell disruption, Chromatography, Culture media, Filtration, Immunology, Ion Exchange, Metabolism, Positron Emission Tomography, Purification, Size-exclusion chromatography, Solvents

Related Content

Cell Culture Troubleshooting Guide

Cell culture has become one of the most fundamental techniques for modeling biological systems, and is of increasing importance in the biotechnology and pharmaceutical sectors as well as an essential...
Keywords: Antibiotics, Apoptosis, Cell attachment, Cell culture, Cryopreservation, Filtration, Growth factors, Pharmaceutical, Phase transitions

Peer-Reviewed Papers
15

References

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