Overview
6-Hydroxydopamine (6-OHDA) is a synthetic neurotoxic compound structurally similar to dopamine. First synthesized in the 1950s, it selectively targets catecholaminergic neurons by generating oxidative stress. Its primary use is in creating experimental models of neurodegenerative diseases like Parkinson's, where it induces dopaminergic neuron degeneration when administered intracerebrally in animals. Unlike natural neurotransmitters, 6-OHDA cannot cross the blood-brain barrier and must be delivered directly to neural tissue. Researchers value its specificity—while destroying dopaminergic and noradrenergic neurons, it spares serotonergic and cholinergic systems. This makes it indispensable for studying neural pathways and testing neuroprotective therapies.
Physical and Chemical Properties
As a hydroxylated dopamine analogue, 6-OHDA exists as a hygroscopic crystalline solid that oxidizes rapidly in air, turning pink then brown. It's typically stabilized with 0.1% ascorbic acid in solution. The compound shows maximal UV absorption at 280 nm, a property used for concentration verification. Chemically, 6-OHDA undergoes autoxidation to form reactive quinones and hydrogen peroxide, which mediate its neurotoxic effects. This oxidation is catalyzed by transition metals and accelerates at alkaline pH. In research applications, solutions are prepared fresh in ice-cold 0.9% saline with 0.02% ascorbic acid to prevent premature degradation.
Main Applications
In neuroscience, 6-OHDA is primarily used to create unilateral lesion models in rodents for Parkinson's disease research. When injected into the striatum or medial forebrain bundle, it causes progressive dopaminergic neuron death, replicating key features of human PD. These models are crucial for testing potential neuroprotective drugs and deep brain stimulation protocols. Additional applications include studying noradrenergic systems (when injected into the locus coeruleus) and exploring oxidative stress mechanisms. Recent work investigates its role in sympathetic neuron ablation for cancer research. Notably, 6-OHDA cannot replicate Lewy body formation, a limitation in modeling later-stage PD pathology.
Safety and Storage
6-OHDA requires strict safety measures due to its acute toxicity (LD50 ~100 mg/kg in mice). Researchers must use PPE including nitrile gloves, lab coats, and eye protection when handling powder or solutions. Work should occur in fume hoods to avoid inhalation exposure. For storage, the compound is stable for 2-3 years when kept at -20°C in airtight, light-resistant containers under inert gas. Aliquot solutions to avoid repeated freeze-thaw cycles. Contaminated materials require disposal as hazardous waste—autoclaving alone won't neutralize toxicity. Spills should be treated with dilute sodium bisulfite solution before cleanup.
B2B Procurement Guide
Research-grade 6-OHDA is available from specialty chemical suppliers like Sigma-Aldrich, Tocris, and Abcam. Bulk purchases (1g+) may require custom synthesis. Key procurement considerations include: verifying HPLC purity (≥98%), checking for antioxidant stabilizers, and confirming sterility for in vivo use. Prices vary by quantity and purity—small vials (10-25mg) cost $50-150, while 100mg quantities range $300-600. Some suppliers offer pre-weighed aliquots to minimize handling. For international shipments, ensure proper hazardous material documentation. Always request recent stability testing data, as improperly stored batches may show reduced efficacy in animal models.
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