Altered Expression of Inflammation-associated Molecules in Striatum: an Implication for Sensitivity to Heavy Ion Radiations

Overview

Journal Front Cell Neurosci

Specialty Cell Biology

Date 2023 Dec 18

PMID 38107411

Authors

Zixuan Chen

Yumeng Li

Madiha Rasheed

Hao Wang

Runhong Lei

Tuo Zhao

Yulin Deng

Hong Ma

Affiliations

Soon will be listed here.

Abstract

Background And Objective: Heavy ion radiation is one of the major hazards astronauts face during space expeditions, adversely affecting the central nervous system. Radiation causes severe damage to sensitive brain regions, especially the striatum, resulting in cognitive impairment and other physiological issues in astronauts. However, the intensity of brain damage and associated underlying molecular pathological mechanisms mediated by heavy ion radiation are still unknown. The present study is aimed to identify the damaging effect of heavy ion radiation on the striatum and associated underlying pathological mechanisms.

Materials And Methods: Two parallel cohorts of rats were exposed to radiation in multiple doses and times. Cohort I was exposed to 15 Gy of C ions radiation, whereas cohort II was exposed to 3.4 Gy and 8 Gy with Fe ions irradiation. Physiological and behavioural tests were performed, followed by F-FDG-PET scans, transcriptomics analysis of the striatum, and studies to verify the interconnection between immune cells and neurons.

Results: Both cohorts revealed more persistent striatum dysfunction than other brain regions under heavy ion radiation at multiple doses and time, exposed by physiological, behavioural, and F-FDG-PET scans. Transcriptomic analysis revealed that striatum dysfunction is linked with an abnormal immune system. studies demonstrated that radiation mediated diversified effects on different immune cells and sustained monocyte viability but inhibited its differentiation and migration, leading to chronic neuroinflammation in the striatum and might affect other associated brain regions.

Conclusion: Our findings suggest that striatum dysfunction under heavy ion radiation activates abnormal immune systems, leading to chronic neuroinflammation and neuronal injury.

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