胆酸通过促进细胞内甲状腺激素激活诱导能量消耗
Mitsuhiro Watanabe1, Sander M Houten, Chikage Mataki
1Institut de Génétique et Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, 1 Rue Laurent Fries, 67404 Illkirch, France.
Nature
|January 10, 2006
概括
胆酸 (BAs) 通过激活TGR5受体,增加cAMP,并诱导2型甲酸氨酸二氧化酶 (D2) 来增加能量消耗. 这一途径在代谢组织中打击肥胖和胰岛素抵抗.
科学领域:
- 代谢信号传递是代谢信号传递.
- 内分泌学 在内分泌学.
- 细胞代谢的细胞代谢.
背景情况:
- 胆汁酸 (BAs) 对于脂质吸收和胆固醇代谢至关重要.
- 新兴证据强调BA作为信号分子的作用,激活像GPCR TGR5和核受体 (例如FXR-alpha) 等途径.
- 通过SHP诱导,FXR-alpha调节BA稳态,并通过SHP诱导影响肝脂代谢.
研究的目的:
- 为了研究胆汁酸在恒常状态之外的更广泛的代谢作用.
- 阐明BAs影响能量消耗和代谢健康的机制.
- 确定BA介导的代谢调节中的关键分子参与者.
主要方法:
- 向小鼠注射胆汁酸,包括D2淘汰模式.
- 用胆酸治疗棕色脂肪细胞和人类骨肌细胞.
- 测量能源消耗,D2活动,cAMP水平和氧气消耗.
- 对涉及TGR5和FXR-alpha的信号通路的分析.
主要成果:
- 胆酸的使用增加了棕色脂肪组织的能量消耗,预防了小鼠的肥胖和胰岛素抵抗.
- 这种效应依赖于诱导2型铁二氧化酶 (D2).
- 胆酸增加了脂肪细胞和肌细胞的D2活性和氧气消耗,通过TGR5-介导的cAMP产生,独立于FXR-alpha.
结论:
- 胆酸作为关键的代谢整合剂,影响能量恒温.
- BA-TGR5-cAMP-D2信号通路是调节新陈代谢相关组织热生成的关键机制.
- 这一途径代表了改善新陈代谢控制和治疗肥胖和胰岛素抵抗的潜在治疗标.
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