Histamine H3 receptors aggravate cerebral ischaemic injury by histamine-independent mechanisms

Haijing Yan, Xiangnan Zhang, Weiwei Hu, Jing Ma, Weiwei Hou, Xingzhou Zhang, Xiaofen Wang, Jieqiong Gao, Yao Shen, Jianxin Lv, Hiroshi Ohtsu, Feng Han, Guanghui Wang, Zhong Chen

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

The role of the histamine H3 receptor (H3R) in cerebral ischaemia/reperfusion (I/R) injury remains unknown. Here we show that H3R expression is upregulated after I/R in two mouse models. H3R antagonists and H3R knockout attenuate I/R injury, which is reversed by an H3R-selective agonist. Interestingly, H1R and H2R antagonists, a histidine decarboxylase (HDC) inhibitor and HDC knockout all fail to compromise the protection by H3R blockade. H3R blockade inhibits mTOR phosphorylation and reinforces autophagy. The neuroprotection by H3R antagonism is reversed by 3-methyladenine and siRNA for Atg7, and is diminished in Atg5-/- mouse embryonic fibroblasts. Furthermore, the peptide Tat-H3RCT414-436, which blocks CLIC4 binding with H3Rs, or siRNA for CLIC4, further increases I/R-induced autophagy and protects against I/R injury. Therefore, H3R promotes I/R injury while its antagonism protects against ischaemic injury via histamine-independent mechanisms that involve suppressing H3R/CLIC4 binding-activated autophagy, suggesting that H3R inhibition is a therapeutic target for cerebral ischaemia.

Original languageEnglish
Article number3334
JournalNature communications
Volume5
DOIs
Publication statusPublished - 2014 Feb 25

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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