Abstract
Growing lines of evidence suggests that high mobility group box-1 (HMGB1) plays an important role for promoting inflammation and apoptosis in brain ischemia. Previously, we demonstrated that inducers of heme oxygenase-1 (HO-1) significantly reduce HMGB1 release in inflammatory conditions in vitro and in vivo. Thus, we tested our hypothesis that higenamine protects brain injury by inhibition of middle cerebral artery occlusion (MCAO)-mediated HMGB1 release in vivo, and glucose/glucose oxidase (GOX)-induced apoptosis in C6 cells in vitro due to HO-1 induction. Higenamine increased HO-1 expression in C6 cells in both hypoxia and normoxia, in which the former was much more significant than the latter. Higenamine increased Nrf-2 luciferase activity, translocated Nrf-2 to nucleus, and increased phosphorylation of Akt in C6 cells. Consistent with this, LY 294002, a PI3K inhibitor, inhibited HO-1 induction by higenamine and apoptosis induced by glucose/GOX in C6 cells was prevented by higenamine, which effect was reversed by LY 294002. Importantly, administration of higenamine (i.p) significantly reduced brain infarct size, mortality rate, MPO activity and tissue expression of HMGB1 in MCAO rats. In addition, recombinant high mobility group box 1 induced apoptosis in C6 cells by increasing ratio of Bax/bcl-2 and cleaved caspase c, which was inhibited by higenamine, and all of these effects were reversed by co-treatment with ZnPPIX. Therefore, we conclude that higenamine, at least in part, protects brain cells against hypoxic damages by up-regulation of HO-1. Thus, higenamine may be beneficial for the use of ischemic injuries such as stroke.
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Abbreviations
- ARE:
-
Antioxidant response element
- GFAP:
-
Glial fibrillary acidic protein
- HMGB1:
-
High mobility group box-1
- HO-1:
-
Heme oxygenase-1
- I/R:
-
Ischemia and reperfusion
- LPS:
-
Lipopolysaccharide
- MCAO:
-
Middle cerebral artery occlusion
- MPO:
-
Myeloperoxidase
- Nrf2:
-
Nuclear factor erythroid 2-related factor
- PCNA:
-
Proliferating cell nuclear antigen
- PI3K:
-
Phosphoinositol-3-kinase
- PKA:
-
Protein kinase A
- ROS:
-
Reactive oxygen species
- TUNEL:
-
Terminal deoxynucleotidyl transferase dUTP-mediated nicked end labeling
- ZnppIX:
-
Zinc protoporphyrin IX
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Acknowledgment
This work was supported by grant from NRF (03-2010-0298) and MRC program from MOST/KOSEF (R13-2005-012-01003-0).
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Yu Mi Ha and Min Young Kim have contributed equally to this work.
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Ha, Y.M., Kim, M.Y., Park, M.K. et al. Higenamine reduces HMGB1 during hypoxia-induced brain injury by induction of heme oxygenase-1 through PI3K/Akt/Nrf-2 signal pathways. Apoptosis 17, 463–474 (2012). https://doi.org/10.1007/s10495-011-0688-8
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DOI: https://doi.org/10.1007/s10495-011-0688-8