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Cholesterol metabolites exported from human brain.

Luigi Iuliano1, Peter J Crick2, Chiara Zerbinati1

  • 1Department of Medico-Surgical Sciences and Biotechnology, Sapienza University of Rome, corso della Repubblica 79, Latina 04100, Italy.

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The human brain exports cholesterol metabolites like 24S-hydroxycholesterol. This study quantifies the brain

Keywords:
24S-hydroxycholesterolGC–MSLC–MSOxysterol

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Area of Science:

  • Neuroscience
  • Metabolomics
  • Biochemistry

Background:

  • The brain contains 25% of the body's cholesterol, crucial for neuronal function.
  • The blood-brain barrier restricts cholesterol but allows passage of oxygenated forms (oxysterols).
  • Understanding brain cholesterol metabolism and its exchange with circulation is vital for neurological health.

Purpose of the Study:

  • To quantify the bidirectional flux of cholesterol metabolites between the human brain and systemic circulation.
  • To identify and measure specific oxysterols exchanged across the blood-brain barrier.
  • To investigate the brain's role in metabolizing and exporting cholesterol derivatives.

Main Methods:

  • Utilized mass spectrometry (MS), including gas chromatography-MS (GC-MS) and liquid chromatography-MS (LC-MS).
  • Measured concentration differences of oxysterols in jugular vein (brain outflow) and forearm vein (systemic circulation) blood plasma.
  • Quantified the flux rates of over 20 cholesterol metabolites.

Main Results:

  • Confirmed significant export of 24S-hydroxycholesterol from the brain at 2-3 mg/24h.
  • Quantified the export of reactive oxygen species-associated metabolites: 5α-hydroxy-6-oxocholesterol (0.1 mg/24h), 7β-hydroxycholesterol (2 mg/24h), and 7-oxocholesterol (2 mg/24h).
  • Indicated potential import of (25R)26-hydroxycholesterol into the brain and export of 7α-hydroxy-3-oxocholest-4-enoic acid from the brain.

Conclusions:

  • Established quantitative flux rates for key cholesterol metabolites between the human brain and circulation.
  • Demonstrated the brain's active role in exporting cholesterol derivatives, including those linked to oxidative stress.
  • Highlighted the utility of peripheral blood sampling for assessing brain cholesterol metabolism.