Abstract
Cerebral ischemia/reperfusion is known to activate endogenous neural stem/progenitor cell (NS/PC) proliferation, but the mechanisms leading to NS/PC proliferation remain unknown. Astrocytes are vital components of the neurogenic niche and play a crucial role in regulating NS/PC proliferation and differentiation. After focal cerebral ischemia/reperfusion (I/R), astrocytes release a damage-associated molecular-pattern molecule called high-mobility group box 1 (HMGB1). Since HMGB1 is critical for NS/PC proliferation during brain development, we modeled I/R using glucose deprivation/reperfusion (OGD/R) in vitro and examined the effect of HMGB1 released by astrocytes on NS/PC proliferation. Further, we determined the role of the PI3K/Akt signaling pathway in this process. Using conditioned media from OGD/R astrocytes with or without RNA interference for HMGB1, as well as with anti-HMGB1 antibodies, we evaluated the effect of astrocyte-derived HMGB1 on NS/PC proliferation. Using the potent PI3K/Akt inhibitor, LY294002, we explored the likely mechanism of HMGB1-induced NS/PC proliferation. OGD/R astrocyte-conditioned media (ACM) increased NS/PC proliferation, and HMGB1 RNA interference prevented this effect. Using an HMGB1 neutralizing antibody in OGD/R ACM also abrogated NS/PC proliferation. LY294002 effectively reduced phospho-Akt levels and reduced NS/PC proliferation induced by HMGB1 in vitro. Our data demonstrate that HMGB1 released by OGD/R astrocytes promotes NS/PC proliferation through activation of the PI3K/Akt signaling pathway. Local HMGB1 release may induce endogenous NS/PC to proliferate following cerebral I/R and suggests that HMGB1 may play a pivotal role in brain tissue repair after an ischemic event.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (No. 30470606) and the Program of the Traditional Chinese Medical Research of Chongqing Municipal Health Bureau (No. 2003-B-16).
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All authors declare that they have no perceived or actual conflict of interests.
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Li, M., Sun, L., Li, Y. et al. Oxygen Glucose Deprivation/Reperfusion Astrocytes Promotes Primary Neural Stem/Progenitor Cell Proliferation by Releasing High-Mobility Group Box 1. Neurochem Res 39, 1440–1450 (2014). https://doi.org/10.1007/s11064-014-1333-z
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DOI: https://doi.org/10.1007/s11064-014-1333-z