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Tissue distribution, hormonal regulation, ontogeny, diurnal expression, and induction of mouse cystine transporters Slc3a1 and Slc7a9.
Free Radical Research ( IF 3.3 ) Pub Date : 2020-09-01 , DOI: 10.1080/10715762.2020.1812597
Kai Connie Wu 1 , Scott A Reisman 1 , Curtis D Klaassen 1
Affiliation  

Slc7a11 (xCT) and Slc3a1 (rBAT) are cystine uptake transporters that maintain intracellular concentrations of cysteine, the rate-limiting amino acid in glutathione synthesis. This study was conducted to first determine the tissue distribution of the two transporters in male and female mice. Because Slc3a1 was the primary cystine transporter in liver, its sex-divergent expression, ontogeny, diurnal rhythm and whether its mRNA expression is altered by transcription factors (AhR, CAR, PXR, PPARα, and Nrf2) was also investigated. Slc7a11 was expressed highest in brain and gonads. Slc3a1 was expressed highest in kidney and intestine, followed by liver. Duodenal and hepatic Slc3a1 was higher in females than males. Hepatic Slc3a1 was high during darkness and low during daytime. Hepatic Scl3a1 was lowest pre-birth, increased to near maximal levels at birth, decreased back to pre-birth levels between Days 3–10, and then returned to peak levels by Day 45. Except for CAR, activation of transcription factors did not increase hepatic mRNA expression of Slc3a1. Chemical activation of CAR significantly induced Slc3a1 1.4-fold in wild-type but not CAR-null mice. Slc3a1 mRNA was higher in livers of AhR- and Nrf2-null mice compared to wild-type mice. High doses of diquat but not acetaminophen induced Slc3a1, suggesting Slc3a1 may respond to oxidative stress but not necessarily to GSH depletion. Overall, Slc7a11 is mainly expressed in brain and gonads, whereas Slc3a1 is mainly expressed in kidney, small intestine and liver, and its hepatic expression is regulated by diurnal rhythm and certain xenobiotic treatments.



中文翻译:

小鼠胱氨酸转运蛋白 Slc3a1 和 Slc7a9 的组织分布、激素调节、个体发育、昼夜表达和诱导。

Slc7a11 (xCT) 和 Slc3a1 (rBAT) 是维持细胞内半胱氨酸浓度的胱氨酸摄取转运蛋白,半胱氨酸是谷胱甘肽合成中的限速氨基酸。进行这项研究是为了首先确定雄性和雌性小鼠中两种转运蛋白的组织分布。由于 Slc3a1 是肝脏中的主要胱氨酸转运蛋白,因此还研究了其性别差异表达、个体发育、昼夜节律以及其 mRNA 表达是否被转录因子(AhR、CAR、PXR、PPARα 和 Nrf2)改变。Slc7a11 在脑和性腺中表达最高。Slc3a1 在肾脏和肠道中表达最高,其次是肝脏。女性的十二指肠和肝脏 Slc3a1 高于男性。肝脏 Slc3a1 在黑暗中高,在白天低。肝 Scl3a1 在出生前最低,在出生时增加到接近最大水平,在第 3-10 天之间下降到出生前水平,然后在第 45 天恢复到峰值水平。除了 CAR,转录因子的激活没有增加 Slc3a1 的肝 mRNA 表达。CAR 的化学激活在野生型而非 CAR 缺失小鼠中显着诱导 Slc3a1 1.4 倍。与野生型小鼠相比,AhR 和 Nrf2 缺失小鼠肝脏中的 Slc3a1 mRNA 更高。高剂量敌草快但不是对乙酰氨基酚诱导 Slc3a1,表明 Slc3a1 可能对氧化应激有反应,但不一定对 GSH 消耗有反应。总体而言,Slc7a11 主要在脑和性腺中表达,而 Slc3a1 主要在肾脏、小肠和肝脏中表达,其肝脏表达受昼夜节律和某些外源性处理的调节。然后在第 45 天恢复到峰值水平。除 CAR 外,转录因子的激活不会增加 Slc3a1 的肝脏 mRNA 表达。CAR 的化学激活在野生型而非 CAR 缺失小鼠中显着诱导 Slc3a1 1.4 倍。与野生型小鼠相比,AhR 和 Nrf2 缺失小鼠肝脏中的 Slc3a1 mRNA 更高。高剂量敌草快但不是对乙酰氨基酚诱导 Slc3a1,表明 Slc3a1 可能对氧化应激有反应,但不一定对 GSH 消耗有反应。总体而言,Slc7a11 主要在脑和性腺中表达,而 Slc3a1 主要在肾脏、小肠和肝脏中表达,其肝脏表达受昼夜节律和某些外源性处理的调节。然后在第 45 天恢复到峰值水平。除 CAR 外,转录因子的激活不会增加 Slc3a1 的肝脏 mRNA 表达。CAR 的化学激活在野生型而非 CAR 缺失小鼠中显着诱导 Slc3a1 1.4 倍。与野生型小鼠相比,AhR 和 Nrf2 缺失小鼠肝脏中的 Slc3a1 mRNA 更高。高剂量敌草快但不是对乙酰氨基酚诱导 Slc3a1,表明 Slc3a1 可能对氧化应激有反应,但不一定对 GSH 消耗有反应。总体而言,Slc7a11 主要在脑和性腺中表达,而 Slc3a1 主要在肾脏、小肠和肝脏中表达,其肝脏表达受昼夜节律和某些外源性处理的调节。CAR 的化学激活在野生型而非 CAR 缺失小鼠中显着诱导 Slc3a1 1.4 倍。与野生型小鼠相比,AhR 和 Nrf2 缺失小鼠肝脏中的 Slc3a1 mRNA 更高。高剂量敌草快但不是对乙酰氨基酚诱导 Slc3a1,表明 Slc3a1 可能对氧化应激有反应,但不一定对 GSH 消耗有反应。总体而言,Slc7a11 主要在脑和性腺中表达,而 Slc3a1 主要在肾脏、小肠和肝脏中表达,其肝脏表达受昼夜节律和某些外源性处理的调节。CAR 的化学激活在野生型而非 CAR 缺失小鼠中显着诱导 Slc3a1 1.4 倍。与野生型小鼠相比,AhR 和 Nrf2 缺失小鼠肝脏中的 Slc3a1 mRNA 更高。高剂量敌草快但不是对乙酰氨基酚诱导 Slc3a1,表明 Slc3a1 可能对氧化应激有反应,但不一定对 GSH 消耗有反应。总体而言,Slc7a11 主要在脑和性腺中表达,而 Slc3a1 主要在肾脏、小肠和肝脏中表达,其肝脏表达受昼夜节律和某些外源性处理的调节。表明 Slc3a1 可能对氧化应激有反应,但不一定对 GSH 消耗有反应。总体而言,Slc7a11 主要在脑和性腺中表达,而 Slc3a1 主要在肾脏、小肠和肝脏中表达,其肝脏表达受昼夜节律和某些外源性处理的调节。表明 Slc3a1 可能对氧化应激有反应,但不一定对 GSH 消耗有反应。总体而言,Slc7a11 主要在脑和性腺中表达,而 Slc3a1 主要在肾脏、小肠和肝脏中表达,其肝脏表达受昼夜节律和某些外源性处理的调节。

更新日期:2020-09-21
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