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The Diagnostic Use of the Plasma Quantification of 24S-Hydroxycholesterol and Other Oxysterols in Neurodegenerative Disease

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Implication of Oxysterols and Phytosterols in Aging and Human Diseases

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1440))

Abstract

Cholesterol regulates fluidity and structure of cellular membranes. The brain is involved in signal transduction, synaptogenesis, and membrane trafficking. An impairment of its metabolism was observed in different neurodegenerative diseases, such as Multiple Sclerosis, Alzheimer, and Huntington diseases. Because of the blood–brain barrier, cholesterol cannot be uptaken from the circulation and all the cholesterol is locally synthetized. The excess cholesterol in neurons is converted into 24S-hydroxycholesterol (24OHC) by the cholesterol 24-hydroxylase (CYP46A1). The plasmatic concentration of 24OHC results in the balance between cerebral production and liver elimination. It is related to the number of metabolically active neurons in the brain. Several factors that affect the brain cholesterol turnover and the liver elimination of oxysterols, the genetic background, nutrition, and lifestyle habits were found to significantly affect plasma levels of 24OHC. Reduced levels of 24OHC were found related to the loss of metabolically active cells and the degree of brain atrophy. The dysfunction of the blood–brain barrier, inflammation, and increased cholesterol turnover might overlap with this progressive reduction giving temporary increased levels of 24OHC.

The study of plasma 24OHC is likely to offer an insight into brain cholesterol turnover with a limited diagnostic power.

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Abbreviations

24OHC:

24S-Hydroxycholesterol

25OHC:

25-Hydroxycholesterol

ABC-transporter family:

ATP binding cassettes transporter family

ACAT:

Acyl-Coa:cholesterol acyltransferase

AD:

Alzheimer disease

ALS:

Amyotrophic lateral sclerosis

ApoE:

Apolipoprotein E

BBB:

Blood–brain barrier

BP:

Bipolar disorders

CNS:

Central nervous system

CSF:

Cerebrospinal fluid

CTX:

Cerebrotendinous xantomatosis

CYP46A1:

Cholesterol 24-hydroxylase

CYP51:

Lanosterol 14-a demethylase

DHCR24:

24-Dehydrocholesterol reductase or seladin-1

DHCR7:

7-Dehydrocholesterol reductase

ER:

Endoplasmic reticulum

HD:

Huntington disease

HDL:

High-density lipoprotein

HMGCoA:

3-Hydroxy-3-methylglutaril-CoA

HMGCR:

HMGCoA reductase

LDL:

Low-density lipoprotein

LXR:

Liver X receptor

MBP:

Myelin basic protein

MMSE:

Mini-mental State Examination

MRI:

Magnetic resonance imaging

MS:

Multiple sclerosis

NADPH:

Nicotinamide adenine dinucleotide phosphate reduced

NPC:

Niemann–Pick type C

PD:

Parkinson’s disease

PLP:

Proteo-lipid protein

ROS:

Radical oxygen species

SCA:

Spinocerebellar ataxias

SREBPs:

Sterol responsive element (SRE) binding proteins

VD:

Vascular dementia

WHMs:

White Matter Hyperintensities

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Conflict of Interest

The authors do not have any conflict of interest.

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Correspondence to Valerio Leoni .

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© 2024 The Author(s), under exclusive license to Springer Nature Switzerland AG

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Tripodi, D., Vitarelli, F., Spiti, S., Leoni, V. (2024). The Diagnostic Use of the Plasma Quantification of 24S-Hydroxycholesterol and Other Oxysterols in Neurodegenerative Disease. In: Lizard, G. (eds) Implication of Oxysterols and Phytosterols in Aging and Human Diseases. Advances in Experimental Medicine and Biology, vol 1440. Springer, Cham. https://doi.org/10.1007/978-3-031-43883-7_17

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