Abstract
Early brain injury (EBI), highlighted with inflammation and apoptosis, occurring within 72 h after subarachnoid hemorrhage (SAH), is associated with the prognosis of SAH. Recent studies have revealed that hydrogen-rich saline (HS) exerted multiple neuroprotective properties in many neurological diseases including SAH, involved to anti-oxidative and anti-apoptotic effect. We have previously reported that HS could attenuate neuronal apoptosis as well as vasospasm. However, the underlying mechanism of HS on inflammation in SAH-induced EBI remains unclear. In this study, we explored the influence of HS on nuclear factor-κB (NF-κB) pathway and nucleotide binding and oligomerization domain-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome at early stage after SAH, by injecting HS intraperitoneally to SAH rats. One hundred and twenty-nine SD rats were randomly divided into four groups: sham group, SAH group, SAH+vehicle group, and SAH+HS group. SAH model was conducted using endovascular perforation method; all rats were sacrificed at 24 h after SAH. Protein level of pIκBα, cytosolic and nuclear p65, NLRP3, apoptosis-associated speck-like protein containing a caspase recruitment domain (ASC), caspase-1, interleukin-1β (IL-1β), and cleaved caspase-3 were measured by western blot. mRNA level of IL-1β, interleukin-6 (IL-6), tumor necrosis factor-c (TNF-α) were evaluated by RT-PCR. Cellular injury and death was detected by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) and Nissl staining, respectively. Our results showed that pIκBα, nuclear p65, NLRP3, ASC, caspase-1, IL-1β, cleaved caspase-3 proteins, as well as the mRNA of IL-1β, IL-6, and TNF-ɑ increased at 24 h after SAH, while cytosolic p65 decreased. TUNEL and Nissl staining presented severe cellular injury at 24 h post-SAH. However, after HS administration, the changes mentioned above were reversed. In conclusion, HS may inhibit inflammation in EBI and improve neurobehavioral outcome after SAH, partially via inactivation of NF-κB pathway and NLRP3 inflammasome.
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Abbreviations
- SAH:
-
Subarachnoid hemorrhage
- EBI:
-
Early brain injury
- ROS:
-
Reactive oxygen species
- HS:
-
Hydrogen-rich saline
- NF-κB:
-
Nuclear factor-κB
- IκB:
-
Inhibitor of NF-κB
- IKK:
-
Iκ kinase
- NLRP3:
-
Nucleotide binding and oligomerization domain-like receptor family pyrin domain-containing 3
- ASC:
-
Apoptosis-associated speck-like protein containing a caspase recruitment domain
- MDA:
-
Malondialdehyde
- TUNEL:
-
Terminal deoxynucleotidyl transferase dUTP nick end labeling
- DIND:
-
Delayed ischemic neurological deficit
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Acknowledgments
This study was supported by Zhenni Guo from the First Norman Bethune Hospital of Jilin University and Lusha Tong from the Second Affiliated Hospital, School of Medicine, Zhejiang University. This work was supported by grant 81171096, 81371369, and 81371433 from the National Natural Science Foundation of China. This study was also supported by Grant 2011KYA49 from Health department of Zhejiang province (Zhao Qiong).
Compliance with Ethical Standards
All experimental protocols involving animals (including all surgical procedure) were approved by the Institutional Animal Care and Use Committee (IACUC) of Zhejiang University. All rat experimental procedures were performed in accordance with the Regulations for the Administration of Affairs Concerning Experimental Animals approved by the State Council of People’s Republic of China.
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The authors declare that there is no conflict of interest regarding the publication of this paper.
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Anwen Shao and Haijian Wu contributed equally to this work.
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Shao, A., Wu, H., Hong, Y. et al. Hydrogen-Rich Saline Attenuated Subarachnoid Hemorrhage-Induced Early Brain Injury in Rats by Suppressing Inflammatory Response: Possible Involvement of NF-κB Pathway and NLRP3 Inflammasome. Mol Neurobiol 53, 3462–3476 (2016). https://doi.org/10.1007/s12035-015-9242-y
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DOI: https://doi.org/10.1007/s12035-015-9242-y