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Published on: September 2, 2010
Neuroprotective Effects of BHDPC, a Novel Neuroprotectant, on Experimental Stroke by Modulating Microglia
Chuwen Li1,2, Yaqi Bian2, Yu Feng2
1Key Laboratory of Molecular Target & Clinical Pharmacology, School of Pharmaceutical Sciences , Guangzhou Medical University , Guangzhou 510182 , China.
Abstract:
This study mainly investigated the therapeutic effects of BHDPC on ischemic stroke and its underlying mechanisms. In vivo, the transient middle cerebral artery occlusion (MCAO) was used to induce ischemic model. In vitro, oxygen and glucose deprivation/reperfusion (OGD/R)-induced ischemic stroke in BV-2 microglia and primary neurons, and bEnd.3 mouse cerebral microvascular endothelial cells (ECs) were also used. First, we found that BHDPC exerts considerable neuroprotection against MCAO-induced ischemic injury to mice via alleviating neurological deficits and brain infarcts, inhibiting neuronal cell loss and apoptosis, and attenuating blood-brain barrier disruption and tight junction protein changes. Next, we observed that BHDPC significantly reduced microglial M1 activation but enhanced M2 polarization in MCAO-induced ischemic brain. Further experiments in vitro indicated that BHDPC suppressed microglial activation but promoted M2 microglial polarization in OGD/R-induced BV-2 microglia. In addition, conditioned medium (CM) experiments showed that CM from BHDPC-treated BV-2 microglia provided protections against OGD/R-induced ischemic damage in primary neurons and bEnd.3 ECs. Moreover, we found that BHDPC actions on microglial inflammation were associated with the inactivation of NF-κB signaling. Interestingly, we also found that BHDPC enhanced phosphorylation of protein kinase A (PKA) and cAMP-response element-binding protein (CREB). The pharmacological inhibition or gene knockdown of PKA/CREB signaling diminished BHDPC-promoted microglial M2 polarization. In summary, BHDPC conferred neuroprotection against ischemic injury in experimental stroke models. Modulating microglial activation and polarization contributes to BHDPC-mediated neuroprotective actions, which in part were mediated by nuclear factor kappa B and PKA/CREB signaling pathway.
Insights
BHDPC offers significant neuroprotection in stroke models by reducing brain damage and neuronal loss. It modulates microglial polarization and impacts NF-κB and PKA/CREB signaling pathways for therapeutic benefits.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Ischemic stroke remains a leading cause of death and disability worldwide.
- Understanding the mechanisms of neuroprotection is crucial for developing effective therapies.
- Microglial activation and polarization play a significant role in ischemic stroke pathology.
Purpose of the Study:
- To investigate the therapeutic effects of BHDPC on ischemic stroke.
- To elucidate the underlying mechanisms of BHDPC's neuroprotective actions.
- To explore BHDPC's impact on microglial activation and polarization.
Main Methods:
- In vivo transient middle cerebral artery occlusion (MCAO) model in mice.
- In vitro oxygen-glucose deprivation/reperfusion (OGD/R) models using BV-2 microglia, primary neurons, and bEnd.3 endothelial cells.
- Analysis of neurological deficits, brain infarcts, neuronal apoptosis, blood-brain barrier integrity, microglial polarization, NF-κB, PKA, and CREB signaling.
Main Results:
- BHDPC significantly alleviated neurological deficits, brain infarcts, and neuronal loss in MCAO mice.
- BHDPC inhibited M1 microglial activation and promoted M2 polarization in both in vivo and in vitro models.
- BHDPC's effects were linked to the inactivation of NF-κB and activation of PKA/CREB signaling pathways.
Conclusions:
- BHDPC demonstrates potent neuroprotective effects against ischemic stroke.
- Modulation of microglial activation and polarization is a key mechanism underlying BHDPC's efficacy.
- The neuroprotective actions of BHDPC are mediated, in part, by the NF-κB and PKA/CREB signaling pathways.
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