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Oxysterols in Central and Peripheral Synaptic Communication

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Implication of Oxysterols and Phytosterols in Aging and Human Diseases

Abstract

Cholesterol is a key molecule for synaptic transmission, and both central and peripheral synapses are cholesterol rich. During intense neuronal activity, a substantial portion of synaptic cholesterol can be oxidized by either enzymatic or non-enzymatic pathways to form oxysterols, which in turn modulate the activities of neurotransmitter receptors (e.g., NMDA and adrenergic receptors), signaling molecules (nitric oxide synthases, protein kinase C, liver X receptors), and synaptic vesicle cycling involved in neurotransmitters release. 24-Hydroxycholesterol, produced by neurons in the brain, could directly affect neighboring synapses and change neurotransmission. 27-Hydroxycholesterol, which can cross the blood–brain barrier, can alter both synaptogenesis and synaptic plasticity. Increased generation of 25-hydroxycholesterol by activated microglia and macrophages could link inflammatory processes to learning and neuronal regulation. Amyloids and oxidative stress can lead to an increase in the levels of ring-oxidized sterols and some of these oxysterols (4-cholesten-3-one, 5α-cholestan-3-one, 7β-hydroxycholesterol, 7-ketocholesterol) have a high potency to disturb or modulate neurotransmission at both the presynaptic and postsynaptic levels. Overall, oxysterols could be used as “molecular prototypes” for therapeutic approaches. Analogs of 24-hydroxycholesterol (SGE-301, SGE-550, SAGE718) can be used for correction of NMDA receptor hypofunction-related states, whereas inhibitors of cholesterol 24-hydroxylase, cholestane-3β,5α,6β-triol, and cholest-4-en-3-one oxime (olesoxime) can be utilized as potential anti-epileptic drugs and (or) protectors from excitotoxicity.

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Abbreviations

7β-HC:

7β-Hydroxycholesterol

7-KC:

7-Ketocholesterol

24-HC:

24-Hydroxycholesterol

27-HC:

27-Hydroxycholesterol

ALS:

Amyotrophic lateral sclerosis

AMPA receptor:

α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor

CNS:

Central nerve system

CSF:

Cerebrospinal fluid

ER:

Endoplasmic reticulum

GABA:

Gamma aminobutyric acid

LTP:

Long-term potentiation

LXR:

Liver X receptor

NMDA receptor:

N-Methyl-d-aspartate receptor

NMJ:

Neuromuscular junction

NO:

Nitric oxide

ROS:

Reactive oxygen species

VDAC:

Voltage-dependent anion channel

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Acknowledgments

I am grateful to my family for their continuous support. Many thanks to my collaborators and the numerous Researchers for insights regarding the multifaced roles of oxysterols in synaptic communications. I am grateful to Dr. Nicole El-Darzi (Case Western Reserve University) for her helpful discussion and comments on the chapter.

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Correspondence to Alexey M. Petrov .

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This work was supported by the Russian Science Foundation, grant number [21-14-00044], https://rscf.ru/project/21-14-00044/.

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The author has no relevant financial or non-financial interests to disclose.

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

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Petrov, A.M. (2024). Oxysterols in Central and Peripheral Synaptic Communication. 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_6

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