超极化 [1-13C] 乙-l-卡尼丁 探测三碳酸循环活动 In Vivo
Jun Chen1, Tamara K Singh2, Sarah Al Nemri1
1Advanced Imaging Research Center, The University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States.
ACS sensors
|August 14, 2023
概括
研究人员开发了超极化[1-13C]乙-l-carnitine (ALCAR) 用于对心脏线粒体氧化酸化 (OXPHOS) 的非侵入性评估. 这种新型的探测器允许直接分析三碳酸 (TCA) 循环活动in vivo.
科学领域:
- 代谢成像 - 代谢成像
- 心血管研究研究心血管研究
- 生物化学 生物化学
背景情况:
- 线粒体氧化酸化 (OXPHOS) 对于ATP产生至关重要,并且与各种病理有关.
- 乙-辅酶A (CoA) 的可用性,由乙-l-卡尼丁 (ALCAR) 提供,对于OXPHOS和三碳酸 (TCA) 循环至关重要.
- 目前评估心脏代谢功能的方法在体内有局限性.
研究的目的:
- 开发和验证超极化 (HP) [1-13C]ALCAR作为评估心脏TCA循环活动的新型非侵入性探针.
- 为了研究心脏OXPHOS和TCA循环功能in vivo使用HP [1-13C]ALCAR在不同的营养状态下.
- 为了比较HP [1-13C]ALCAR与HP [1-13C]pyruvate的功效,用于代谢评估.
主要方法:
- 合成同位素标记的 [1-13C]ALCAR.
- 对C核的T值和极化水平的表征,用于体内测量.
- 应用HP [1-13C]ALCAR在食和禁食条件下的老鼠心脏代谢成像.
主要成果:
- HP [1-13C]ALCAR证明了适用于体内代谢测量的适当性质.
- 心脏TCA循环活动通过检测[5-C]酸盐,成功地在体内分析了[5-C]酸盐.
- 这项研究成功地将HP [1-13C]ALCAR与HP [1-13C]pyruvate进行了比较,突出了前者的潜力.
结论:
- HP [1-13C]ALCAR是一种可行的非侵入式探针,用于直接分析心脏线粒体功能.
- 这种方法可以实时评估TCA循环活动,这对心脏平衡至关重要.
- 这些发现为研究心脏代谢和相关疾病开辟了新的途径.
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