Regulation of Intermittent Hypoxia on Brain Dopamine in Amphetaminized Rats

10.4077/CJP.2015.BAD283

Po-Ling Yu；Shu-Yun Cheng；Jou-Chun Chou；Wynn H.T. Pan；Shyi-Wu Wang；Paulus S. Wang

amphetamine ； angiotensin II ； dopamine ； intermittent hypoxia ； microdialysis ； prolactin

The Chinese Journal of Physiology

58卷4期（2015 / 08 / 01）

219 - 227

英文

We investigated intermittent hypoxia (IH) on dopamine (DA) release in rat brain treated with or without amphetamine (AMPH). Rats were divided into four groups including normoxia, IH, AMPH, and AMPH+IH treatments. The cerebrospinal fluid (CSF) was collected and the DA levels were detected by high performance liquid chromatography (HPLC). The plasma prolactin (PRL) concentration was measured by radioimmunoassay (RIA). We found that IH reduced basal DA concentration in media prefrontal cortex (mPFC), but increased that in striatum, where DA level was also increased in rats treated with AMPH or AMPH+IH. Angiotensin II (Ang II) increased the DA release in mPFC and striatum and this effect was enhanced in AMPH+IH group. The stimulatory effect of IH on plasma PRL was attenuated in presence of AMPH. Tyrosine hydroxylase (TH) expression was decreased by IH, but increased by AMPH+IH in mPFC. IH or AMPH treatment decreased the expression of vesicular monoamine transporter-2 (VMAT-2) in rat brain. These data suggested that IH altered the DA release and changed the protein expression levels in different parts of rat brain treated with AMPH. IH may play a role in regulating DA metabolism in AMPH addiction.

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