RGD Reference Report - Neurokinin-1 receptor antagonism in a rat model of subarachnoid hemorrhage: prevention of upregulation of contractile ETB and 5-HT1B receptors and cerebral blood flow reduction. - Rat Genome Database

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Neurokinin-1 receptor antagonism in a rat model of subarachnoid hemorrhage: prevention of upregulation of contractile ETB and 5-HT1B receptors and cerebral blood flow reduction.

Authors: Ansar, S  Svendgaard, NA  Edvinsson, L 
Citation: Ansar S, etal., J Neurosurg. 2007 May;106(5):881-6.
RGD ID: 1626451
Pubmed: PMID:17542534   (View Abstract at PubMed)
DOI: DOI:10.3171/jns.2007.106.5.881   (Journal Full-text)

OBJECT: Cerebral vasospasm following subarachnoid hemorrhage (SAH) leads to reduced cerebral blood flow (CBF) and to cerebral ischemia, in some cases even producing infarction and long-term disability. The goal of the present study was to investigate the hypothesis that inhibition of neurokinin-1 receptors (NK1Rs) by administration of L-822429 blunts the decrease in CBF as well as cerebrovascular receptor upregulation in an animal model of SAH. METHODS: Subarachnoid hemorrhage was induced in rats by injection of 250 microl of blood into the prechiasmatic cistern. The NK1R inhibitor L-822429 was injected intracisternally 30 minutes and 24 hours after the induction of SAH. Two days after SAH induction, the basilar arteries were harvested, and contractile responses to endothelin-1 (ET-I, an ETA- and ETB-receptor agonist) and 5-carboxamidotryptamine (a 5-hydroxytryptamine- I1 [5-HT1]-receptor agonist) were investigated using sensitive myographs. To determine whether NKIR inhibition had an influence on local CBF after post-SAH, a quantitative autoradiographic technique was used. After SAH, the vascular receptor phenotype was changed in cerebral arteries through upregulation of contractile ET, and 5-HT1B receptors, while regional and total CBF were markedly reduced. Treatment with the selective NK1R inhibitor L-822429 prevented both the receptor upregulation and the reduction in regional and global CBF. CONCLUSIONS: The data reveal the coregulation of vascular receptor changes and blood flow effects, and also show that interaction with a small-molecule NK1R antagonist is a promising area of focus for the development of specific treatments for SAH.

RGD Manual Disease Annotations    Click to see Annotation Detail View

Objects Annotated

Genes (Rattus norvegicus)
Htr1b  (5-hydroxytryptamine receptor 1B)
Tacr1  (tachykinin receptor 1)

Genes (Mus musculus)
Htr1b  (5-hydroxytryptamine (serotonin) receptor 1B)
Tacr1  (tachykinin receptor 1)

Genes (Homo sapiens)
HTR1B  (5-hydroxytryptamine receptor 1B)
TACR1  (tachykinin receptor 1)


Additional Information