Abstract：
:We evaluated long-term dynorphin A-immunoreactivity in the rat area postrema (AP) after the administration of cisplatin. First, rats were given 1, 5 and 10mg/kg body weight cisplatin (i.p.) and their behavior was monitored for 72h. We observed a delayed increase in pica 24-72h after injection, compared to the 24h before injection. We attributed this to the cisplatin injection. Pica was defined as an increase in the intake of non-nutritional matter such as kaolin. Administration of 1, 5 and 10mg/kg cisplatin led to an increase in kaolin intake on day 1. Administration of 5 and 10mg/kg of cisplatin led to decreased intake of laboratory chow (MF) on days 1-3, but 10mg/kg cisplatin causes an excessive aggravation of their condition. Following this behavioral experiment, we immunohistochemically examined the induction of dynorphin A in the AP at 24, 48 and 72h post-administration of 1 and 5mg/kg cisplatin. Administration of 5mg/kg cisplatin caused dynorphin A to accumulate gradually in the neurosoma of the AP neurons, and the numbers of positive AP neurosomata at 48 and 72h post-administration were higher than following an equal dosage of 0.9% NaCl. These findings suggest that dynorphin A increases in the central nervous system for a long time following administration, and causes certain behavioral and clinical changes, including those related to appetite and nausea.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Tsukamoto G,Ichikawa H,Kobashi M,Yamada Y,Kikuchi T,Mese H,Sasaki Adoi
10.1016/j.neulet.2007.07.044subject
Has Abstractpub_date
2007-09-07 00:00:00pages
122-6issue
2eissn
0304-3940issn
1872-7972pii
S0304-3940(07)00824-5journal_volume
424pub_type
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