Nicotine self-administration and ERK signaling are altered in RasGRF2 knockout mice.

Nicotine self-administration and ERK signaling are altered in RasGRF2 knockout mice.
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DOI:
10.3389/fphar.2022.986566
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发表时间:
2022
影响因子:
5.6
通讯作者:
--
中科院分区:
医学2区
文献类型:
--
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Ras/Raf/MEK/ERK (Ras-ERK) 信号传导已被证明在可卡因和酒精等滥用药物的影响中发挥作用,但尚未在尼古丁相关奖励行为中得到广泛研究。我们研究了 Ras 鸟嘌呤核苷酸释放因子 2 (RasGRF2)(Ras-ERK 信号通路的上游介质)对 RasGRF2 KO 和 WT 小鼠尼古丁自我给药 (SA) 的作用。我们首先证明,急性尼古丁暴露(0.4 mg/kg)会导致纹状体中磷酸化 ERK1/2 (pERK1/2) 的增加,这与之前的报道一致。我们还证明,WT 小鼠急性(0.4 mg/kg)和重复(0.4 mg/kg,每天注射 10 次)暴露于尼古丁导致的 pERK1/2 增加,在 RasGRF2 KO 小鼠中并不存在,证实 RasGRF2 至少部分调节尼古丁暴露后 Ras-ERK 信号通路的活性。然后,我们对 RasGRF2 KO 和 WT 小鼠进行静脉注射尼古丁 SA(0.03 mg/kg/输注,持续 10 天)。与之前使用可卡因 SA 的报告一致,RasGRF2 KO 小鼠表现出尼古丁 SA 相对于 WT 对照有所增加。这些发现表明 RasGRF2 在尼古丁的增强作用中发挥作用,并暗示 Ras-ERK 信号通路是滥用药物反应的常见介质。
Ras/Raf/MEK/ERK (Ras-ERK) signaling has been demonstrated to play a role in the effects of drugs of abuse such as cocaine and alcohol, but has not been extensively examined in nicotine-related reward behaviors. We examined the role of Ras Guanine Nucleotide Releasing Factor 2 (RasGRF2), an upstream mediator of the Ras-ERK signaling pathway, on nicotine self-administration (SA) in RasGRF2 KO and WT mice. We first demonstrated that acute nicotine exposure (0.4 mg/kg) resulted in an increase in phosphorylated ERK1/2 (pERK1/2) in the striatum, consistent with previous reports. We also demonstrated that increases in pERK1/2 resulting from acute (0.4 mg/kg) and repeated (0.4 mg/kg, 10 daily injections) exposure to nicotine in WT mice were not present in RasGRF2 KO mice, confirming that RasGRF2 at least partly regulates the activity of the Ras-ERK signaling pathway following nicotine exposure. We then performed intravenous nicotine SA (0.03 mg/kg/infusion for 10 days) in RasGRF2 KO and WT mice. Consistent with a previous report using cocaine SA, RasGRF2 KO mice demonstrated an increase in nicotine SA relative to WT controls. These findings suggest a role for RasGRF2 in the reinforcing effects of nicotine, and implicate the Ras-ERK signaling pathway as a common mediator of the response to drugs of abuse.
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