The effectiveness of photobiomodulationof the brain deceases with age
Andrey V. Terskov 1, Alexander A. Shirokov 1,2, Inna A. Blokhina 1, Daria A. Zlatogorskaya 1, Viktoria V. Adushkina 1, Anastasiia I. Semiachkina‐Glushkovskaya1, Ivan V. Fedosov 1, Arina S. Evsukova 1, Oxana V. Semyachkina‐Glushkovskaya 1
1 Saratov State University, Saratov, Russia;
2 Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov, Russia;
Abstract
The progressive number of old adults with cognitive impairment worldwide and the lack of effective pharmacologic therapies require the development of non-pharmacologic strategies. The photobiomodulation (PBM) is a promising method in prevention of early or mild age-related cognitive impairments. However, it remains unclear the efficacy of PBM for old patients with significant age-related cognitive dysfunction. In our study on male mice, we show a gradual increase in the brain amyloid beta (Aβ) levels and a decrease in brain drainage with age, which, however, is associated with a decline in cognitive func-
tion only in old (24 months of age) mice but not in middle-aged (12 months of age) and young (3 month of age) animals. These age-related features are accompanied by the development of hyperplasia of the meningeal lymphatic vessels (MLVs) in old mice underlying the decrease in brain drainage. PBM improves cognitive training exercises and Aβ clearance only in young and middle-aged mice, while old animals are not sensitive to PBM. These results clearly demonstrate that the PBM effects on cognitive function are correlated with age-mediated changes in the MLV network and may be effective if the MLV function is preserved. These findings expand fundamental knowledge about age differences in the effectiveness of PBM for improvement of cognitive functions and Aβ clearance as well as about the lymphatic mechanisms responsible for age decline
in sensitivity to the therapeutic PBM effects.
This study was supported by the grant from the Russian Science Foundation 24-75-10047.
Speaker
Terskov Andrey
Saratov State University
Russia
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