Summary
The neurological recovery following traumatic brain injury (TBI) is limited, largely due to a deficiency in neurogenesis. The present study explores the effects of histamine H3 receptor (H3R) antagonism on TBI and mechanisms related to neurogenesis. H3R antagonism or
H3R
gene knockout alleviated neurological injury in the late phase of TBI, and also promoted neuroblast differentiation to enhance neurogenesis through activation of the histaminergic system. Histamine H1 receptor, but not H2 receptor, in neural stem cells is shown to be essential for this promotion by using
Hrh1
fl/fl
;Nestin
CreERT2
and
Hrh2
fl/fl
;Nestin
CreERT2
mice. Moreover, increase in mature and functional neurons at the penumbra area conferred by H3R antagonism was abrogated in
Hrh1
fl/fl
;Nestin
CreERT2
mice. Taken together, H3R antagonism provides neuroprotection against TBI in the late phase through the promotion of neurogenesis, and the H1 receptor in neural stem cells is required for this action. H3R may serve as a new target for clinical treatment of TBI.
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