AGING CELL:雷帕霉素"延年益寿",小心性别特异性效应

2020-11-07 haibei MedSci原创

早在2009年,美国国家衰老机构的干预测试计划(ITP)表明,从20月龄开始给予雄性或雌性小鼠mTORC1抑制剂雷帕霉素(Rapa),可以显著增加其中位寿命

早在2009年,美国国家衰老机构的干预测试计划(ITP)表明,从20月龄开始给予雄性或雌性小鼠mTORC1抑制剂雷帕霉素(Rapa),可以显著增加其中位寿命,同时也增加了小鼠在第90百分位存活年龄的比例。随后的报道记录了从9月龄开始给予该药物的小鼠也有类似程度的寿命延长,延长的程度取决于Rapa的剂量。Rapa与二甲双胍的组合使雌性中位寿命增加高达26%,雄性中位寿命增加23%。
如果小鼠从9个月开始接受Rapa(14.7 ppm)治疗,然后在22个月时安乐死,组织水平的检测显示Rapa处理的小鼠心脏、肌腱、肾上腺、子宫内膜和肝脏等器官的病理变化发生率较低,这表明衰老的许多方面被Rapa延缓或减速,这种与年龄相关的变化的延缓是推迟致命性疾病和延长寿命的原因。已有的研究显示,用较高剂量的雷帕霉素,口服或腹腔内给药,对寿命延长和癌症发病率也有有益影响。

为了了解从20个月开始,给中年小鼠注射雷帕霉素(Rapa)的时间变化是否会导致不同的生存结果,研究人员最近比较了三种给药方案:20月龄开始连续给药;20月龄开始一个月间给药,一个月停药间隔给药;在20-23月龄给3个月药物。
结果显示,从20月龄开始连续使用42ppm的Rapa可显著增加雄性和雌性小鼠的生存率。但是只有在雄性小鼠中,Rapa处理 20-23月龄3个月的时间可以导致显著的长寿利益。如果一个月间隔一个月给药,对于雌性小鼠和雄性小鼠也都是有效的,但是在雌性小鼠中,这种给药方法是比连续给药效果较差。

由于在Rapa治疗开始之前,小鼠体重增加模式的意外变化使得对这些结果的解释变得更加复杂,这可能是由于研究人员使用了来自两个不同供应商的无药食品。
实验设计包括对其他四种药物的测试,米诺环素、β-胍丙酸、MitoQ和17-二甲基氨基乙基氨基-17-去甲氧基格尔德纳霉素(17-DMAG),但这些药物都没有导致两种性别的存活率的变化。

原始出处:
Randy Strong et al. Rapamycin‐mediated mouse lifespan extension: Late‐life dosage regimes with sex‐specific effects. AGING CELL 2020, DOI: https://doi.org/10.1111/acel.13269

 

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    2021-04-07 维他命
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Blood:GVHD预防方案中加入雷帕霉素可显著改善HLA抗原错配的HCT患者预后

标准GVHD预防方案中加入雷帕霉素可降低非清髓性HLA抗原错配供体移植后的急性GVHD

Aging Cell:雷帕霉素或能有效抑制年龄相关的大脑功能退化

近日,一项刊登在国际杂志Aging Cell上的研究报告中,来自圣安东尼奥健康中心等机构的科学家们通过研究发现,药物雷帕霉素或能改善因年龄相关导致的大脑血流量(流向大脑)减少及记忆力下降的状况;相关研究结果对于开发有效抑制或治疗阿尔兹海默病的新型疗法至关重要。

Blood:雷帕霉素治疗标准风险的急性GVHD

以临床和生物标志物为基础的工具或可识别较低风险的急性移植物抗宿主病(GVHD)人群,使其能够接受新型低强度的治疗。既往数据表明雷帕霉素或可匹敌泼尼松的标准效果。Pidala等人开展一多中心的非盲的随机化II期试验,来评估雷帕霉素对比泼尼松作为标准风险(SR,根据MN GVHD风险评分和Ann Arbor[AA 1/2]生物标志物来定义)的急性GVHD患者的初始治疗第28天时的完全缓解(CR)/部分