Abstract:
:Methamphetamine (METH) is a widely used "club drug" that produces neural damage in the brain, including the loss of some neurons. METH-induced striatal neuronal loss has been attenuated by pretreatment with the neurokinin-1 receptor antagonist WIN-51,708 in mice. Using a histologic method, we have observed the internalization of the neurokinin-1 receptor into endosomes in the striatal somatostatin/NPY/nitric oxide synthase interneurons. To investigate the role of this interneuron in the striatal cell death induced by METH, we assessed by immunohistochemistry the number of striatal nitric oxide synthase-positive neurons in the presence of METH at 8 and 16 hours after systemic injection of a bolus of METH (30 mg/kg, i.p.). We found the number of striatal nitric oxide synthase-positive neurons unchanged at these time points after METH. In a separate experiment we measured the levels of striatal 3-nitrotyrosine (3-NT) by HPLC (high-pressure liquid chromatography) as an indirect index of nitric oxide synthesis. METH increased the levels of 3-nitrotyrosine in the striatum and this increase was significantly attenuated by pretreatment with a selective neurokinin-1 receptor antagonist. These observations suggest a causal relationship between the neurokinin-1 receptor and the activation of neuronal nitric oxide synthase that warrants further investigation.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
Wang J,Xu W,Ali SF,Angulo JAdoi
10.1196/annals.1432.001subject
Has Abstractpub_date
2008-10-01 00:00:00pages
164-71eissn
0077-8923issn
1749-6632pii
NYAS1139001journal_volume
1139pub_type
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