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Journal of Molecular Neuroscience

, Volume 65, Issue 4, pp 514–526 | Cite as

Photobiomodulation Therapy Attenuates Hypoxic-Ischemic Injury in a Neonatal Rat Model

  • Lorelei Donovan Tucker
  • Yujiao Lu
  • Yan Dong
  • Luodan Yang
  • Yong Li
  • Ningjun Zhao
  • Quanguang ZhangEmail author
Article

Abstract

Photobiomodulation (PBM) has been demonstrated as a neuroprotective strategy, but its effect on perinatal hypoxic-ischemic encephalopathy is still unknown. The current study was designed to shed light on the potential beneficial effect of PBM on neonatal brain injury induced by hypoxia ischemia (HI) in a rat model. Postnatal rats were subjected to hypoxic-ischemic insult, followed by a 7-day PBM treatment via a continuous wave diode laser with a wavelength of 808 nm. We demonstrated that PBM treatment significantly reduced HI-induced brain lesion in both the cortex and hippocampal CA1 subregions. Molecular studies indicated that PBM treatment profoundly restored mitochondrial dynamics by suppressing HI-induced mitochondrial fragmentation. Further investigation of mitochondrial function revealed that PBM treatment remarkably attenuated mitochondrial membrane collapse, accompanied with enhanced ATP synthesis in neonatal HI rats. In addition, PBM treatment led to robust inhibition of oxidative damage, manifested by significant reduction in the productions of 4-HNE, P-H2AX (S139), malondialdehyde (MDA), as well as protein carbonyls. Finally, PBM treatment suppressed the activation of mitochondria-dependent neuronal apoptosis in HI rats, as evidenced by decreased pro-apoptotic cascade 3/9 and TUNEL-positive neurons. Taken together, our findings demonstrated that PBM treatment contributed to a robust neuroprotection via the attenuation of mitochondrial dysfunction, oxidative stress, and final neuronal apoptosis in the neonatal HI brain.

Keywords

Photobiomodulation therapy Neonatal hypoxic-ischemia Apoptosis Mitochondrial dysfunction Oxidative stress 

Notes

Funding Information

This study was supported by Research Grant NS086929 from the National Institute of Neurological Disorders and Stroke, National Institutes of Health, USA.

Compliance with Ethical Standards

All procedures were approved by the local ethical committee and were in accordance with the National Institutes of Health guidelines. All efforts were made to minimize the suffering and the number of pups used in the surgical and experimental procedures.

Conflict of Interest

The author declares that there is no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018
corrected publication August/2018

Authors and Affiliations

  1. 1.Department of Neuroscience and Regenerative Medicine, Medical College of GeorgiaAugusta UniversityAugustaUSA

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