Document Detail

Hyperforin attenuates brain damage induced by transient middle cerebral artery occlusion (MCAO) in rats via inhibition of TRPC6 channels degradation.
MedLine Citation:
PMID:  23149561     Owner:  NLM     Status:  MEDLINE    
Hyperforin, a lipophilic constituent of medicinal herb St John's wort, has been identified as the main active ingredient of St John's wort extract for antidepressant action by experimental and clinical studies. Hyperforin is currently known to activate transient receptor potential canonical (subtype) 6 (TRPC6) channel, increase the phosphorylated CREB (p-CREB), and has N-methyl-D-aspartate receptor-antagonistic effect that convert potential neuroprotective effects in vitro. However, the protective effects of hyperforin on ischemic stroke in vivo remain controversial and its neuroprotective mechanisms are still unclear. This study was designed to examine the effects of intracerebroventricular (i.c.v.) injection of hyperforin on transient focal cerebral ischemia in rats. Hyperforin, when applied immediately after middle cerebral artery occlusion (MCAO) onset, significantly reduced infarct volumes and apoptotic cells, and also increased neurologic scores at 24 hours after reperfusion accompanied by elevated TRPC6 and p-CREB activity and decreased SBDP145 activity. When MEK or CaMKIV activity was specifically inhibited, the neuroprotective effect of hyperforin was attenuated, and we observed a correlated decrease in CREB activity. In conclusion, our results clearly showed that i.c.v. injection of hyperforin immediately after MCAO onset blocked calpain-mediated TRPC6 channels degradation, and then to stimulate the Ras/MEK/ERK and CaMKIV pathways that converge on CREB activation, contributed to neuroprotection.
Yun Lin; Jian-Cheng Zhang; Jun Fu; Fang Chen; Jie Wang; Zhi-Lin Wu; Shi-Ying Yuan
Publication Detail:
Type:  Journal Article     Date:  2012-11-14
Journal Detail:
Title:  Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism     Volume:  33     ISSN:  1559-7016     ISO Abbreviation:  J. Cereb. Blood Flow Metab.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-02-01     Completed Date:  2013-03-25     Revised Date:  2014-02-04    
Medline Journal Info:
Nlm Unique ID:  8112566     Medline TA:  J Cereb Blood Flow Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  253-62     Citation Subset:  IM    
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MeSH Terms
Apoptosis / drug effects
Brain Ischemia / drug therapy,  metabolism*,  pathology
Calcium-Calmodulin-Dependent Protein Kinase Type 4 / metabolism
Calpain / metabolism
Cyclic AMP Response Element-Binding Protein / metabolism
Infarction, Middle Cerebral Artery / drug therapy,  metabolism*,  pathology
MAP Kinase Signaling System / drug effects
Nerve Tissue Proteins / metabolism*
Neuroprotective Agents / pharmacology*
Phloroglucinol / analogs & derivatives*,  pharmacology
Phosphorylation / drug effects
Proteolysis / drug effects*
Rats, Sprague-Dawley
TRPC Cation Channels / metabolism*
Terpenes / pharmacology*
Reg. No./Substance:
0/Cyclic AMP Response Element-Binding Protein; 0/Nerve Tissue Proteins; 0/Neuroprotective Agents; 0/TRPC Cation Channels; 0/Terpenes; 0/Trpc6 protein, rat; DHD7FFG6YS/Phloroglucinol; EC Protein Kinase Type 4; EC protein, rat; EC 3.4.22.-/Calpain; RM741E34FP/hyperforin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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