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Oxycodone injections not paired with conditioned place preference have little effect on the hippocampal opioid system in female and male rats.
SYNAPSE ( IF 1.6 ) Pub Date : 2020-07-12 , DOI: 10.1002/syn.22182
Elina Ashirova 1 , Natalina H Contoreggi 1 , Megan A Johnson 1 , Fatima J Al-Khayat 2 , Gabriela A Calcano 1 , Batsheva R Rubin 1 , Emma M O'Cinneide 3 , Yong Zhang 4 , Yan Zhou 4 , Lennox Gregoire 1 , Bruce S McEwen 3 , Mary Jeanne Kreek 4 , Teresa A Milner 1
Affiliation  

Oxycodone (Oxy) conditioned place preference (CPP) in Sprague Dawley rats results in sex‐specific alterations in hippocampal opioid circuits in a manner that facilitates opioid‐associative learning processes, particularly in females. Here, we examined if Oxy (3 mg/kg, I.P.) or saline (Sal) injections not paired with behavioral testing similarly affect the hippocampal opioid system. Sal‐injected females compared to Sal‐injected males had: (1) higher densities of cytoplasmic delta opioid receptors (DOR) in GABAergic hilar dendrites suggesting higher baseline reserve DOR pools and (2) elevated phosphorylated DOR levels, but lower phosphorylated mu opioid receptor (MOR) levels in CA3a suggesting that the baseline pools of activated opioid receptors vary in females and males. In contrast to CPP studies, Oxy‐injections in the absence of behavioral tests resulted in few changes in the hippocampal opioid system in either females or males. Specifically, Oxy‐injected males compared to Sal‐injected males had fewer DORs near the plasma membrane of CA3 pyramidal cell dendrites and in CA3 dendritic spines contacted by mossy fibers, and lower pMOR levels in CA3a. Oxy‐injected females compared to Sal‐injected females had higher total DORs in GABAergic dendrites and lower total MORs in parvalbumin‐containing dendrites. Thus, unlike Oxy CPP, Oxy‐injections redistributed opioid receptors in hippocampal neurons in a manner that would either decrease (males) or not alter (females) excitability and plasticity processes. These results indicate that the majority of changes within hippocampal opioid circuits that would promote opioid‐associative learning processes in both females and males do not occur with Oxy administration alone, and instead must be paired with CPP.

中文翻译:

不与条件性位置偏好配对的羟考酮注射液对雌性和雄性大鼠的海马阿片类药物系统几乎没有影响。

Sprague Dawley 大鼠中的羟考酮 (Oxy) 条件性位置偏好 (CPP) 导致海马阿片类药物回路的性别特异性改变,其方式促进阿片类药物相关学习过程,尤其是在女性中。在这里,我们检查了 Oxy (3 mg/kg, IP) 或生理盐水 (Sal) 注射是否不与行为测试配对同样影响海马阿片类药物系统。与注射 Sal 的男性相比,注射 Sal 的女性具有:(1)GABAergic 肝门树突中细胞质 delta 阿片受体(DOR)的密度更高,表明基线储备 DOR 池更高;(2)磷酸化 DOR 水平升高,但磷酸化 μ 阿片受体较低CA3a 中的 (MOR) 水平表明激活的阿片受体的基线池在女性和男性中有所不同。与 CPP 研究相比,在没有行为测试的情况下,氧气注射导致女性或男性的海马阿片类药物系统几乎没有变化。具体来说,与注射 Sal 的雄性相比,注射氧的雄性在 CA3 锥体细胞树突的质膜附近和与苔藓纤维接触的 CA3 树突棘中具有较少的 DOR,并且 CA3a 中的 pMOR 水平较低。与注射 Sal 的雌性相比,注射氧的雌性在 GABA 能树突中具有更高的总 DOR,在含小清蛋白的树突中具有更低的总 MOR。因此,与 Oxy CPP 不同的是,Oxy 注射以降低(雄性)或不改变(雌性)兴奋性和可塑性过程的方式重新分布海马神经元中的阿片受体。
更新日期:2020-07-12
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