Overview
Oxidized cholesterol derivatives in mice are formed through enzymatic or non-enzymatic oxidation of cholesterol, primarily studied as biomarkers of oxidative stress and contributors to atherosclerosis. These compounds include 7-ketocholesterol, 7α/β-hydroxycholesterol, and epoxides, each with distinct biological activities. In research, they are extracted from mouse plasma or tissues under controlled oxidative conditions. Their study helps elucidate mechanisms of foam cell formation, inflammation, and metabolic diseases. Commercial preparations are typically synthetic analogs standardized for reproducibility.
Physical and Chemical Properties
Mouse oxidized cholesterol derivatives share a sterol backbone but vary in functional groups (e.g., carbonyl, hydroxyl). Most are stable as solids but degrade under light, heat, or prolonged oxygen exposure. Their polarity affects solubility: hydroxylated forms are more polar than ketones. Spectroscopic characterization (NMR, MS) is essential for identification due to structural similarities. For instance, 7-ketocholesterol shows a strong C=O stretch at ~1700 cm⁻¹ in IR spectra. These compounds often autofluoresce, enabling detection in cellular assays.
Main Applications
In biomedical research, oxidized cholesterol from mice models human disease pathways. Key uses include inducing endothelial dysfunction in vitro, studying macrophage apoptosis in atherosclerosis, and investigating oxidative stress in neurodegenerative diseases. They also serve as standards in LC-MS/MS assays to quantify oxysterols in biological samples. Recent applications explore their role in immune modulation, with some derivatives activating liver X receptors (LXRs) to regulate lipid metabolism.
Safety and Storage
Oxidized cholesterol derivatives require stringent storage at -20°C under argon to prevent further oxidation. Amber vials are recommended to limit photodegradation. Workplace exposure limits are unspecified, but PPE (gloves, lab coat) is mandatory due to potential cytotoxicity. Disposal should follow institutional guidelines for organic compounds. Spills require absorption with inert material (e.g., vermiculite) and professional hazardous waste removal. Avoid inhalation of powdered forms.
B2B Procurement Guide
Research buyers should prioritize vendors providing Certificate of Analysis (CoA) with purity (>95% by HPLC), derivative specificity, and isotopic labeling options (e.g., ¹³C for tracing studies). Bulk orders (5g+) may reduce costs by ~20%. Key suppliers include Sigma-Aldrich (Merck), Cayman Chemical, and Avanti Polar Lipids. Lead times vary: custom syntheses may take 4-8 weeks. For in vivo studies, verify absence of endotoxins (<0.1 EU/mg).
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