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首页> 外文期刊>Physics in medicine and biology. >Activation of signaling pathways following localized delivery of systemically administered neurotrophic factors across the bloodbrain barrier using focused ultrasound and microbubbles
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Activation of signaling pathways following localized delivery of systemically administered neurotrophic factors across the bloodbrain barrier using focused ultrasound and microbubbles

机译:使用聚焦超声和微泡通过血脑屏障局部递送全身施用的神经营养因子后,激活信号通路

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The brain-derived neurotrophic factor (BDNF) has been shown to have broad neuroprotective effects in addition to its therapeutic role in neurodegenerative disease. In this study, the efficacy of delivering exogenous BDNF to the left hippocampus is demonstrated in wild-type mice (n = 7) through the noninvasively disrupted bloodbrain barrier (BBB) using focused ultrasound (FUS). The BDNF bioactivity was found to be preserved following delivery as assessed quantitatively by immunohistochemical detection of the pTrkB receptor and activated pAkt, pMAPK, and pCREB in the hippocampal neurons. It was therefore shown for the first time that systemically administered neurotrophic factors can cross the noninvasively disrupted BBB and trigger neuronal downstream signaling effects in a highly localized region in the brain. This is the first time that the administered molecule is tracked through the BBB and localized in the neuron triggering molecular effects. Additional preliminary findings are shown in wild-type mice with two additional neurotrophic factors such as the glia-derived neurotrophic factor (n = 12) and neurturin (n = 2). This further demonstrates the impact of FUS for the early treatment of CNS diseases at the cellular and molecular level and strengthens its premise for FUS-assisted drug delivery and efficacy.
机译:脑源性神经营养因子(BDNF)除具有治疗神经退行性疾病的作用外,还具有广泛的神经保护作用。在这项研究中,使用聚焦超声(FUS)通过无创性破坏血脑屏障(BBB)在野生型小鼠(n = 7)中证明了将外源BDNF输送至左海马的功效。通过免疫组织化学检测海马神经元中pTrkB受体和激活的pAkt,pMAPK和pCREB进行定量评估,发现分娩后BDNF的生物活性得以保留。因此,首次显示全身施用的神经营养因子可以穿越非侵入性破坏的BBB,并在大脑高度定位的区域触发神经元下游信号传导作用。这是首次通过BBB追踪所施用的分子并定位在触发分子效应的神经元中。在具有两种其他神经营养因子(例如胶质细胞衍生的神经营养因子(n = 12)和神经营养素(n = 2))的野生型小鼠中显示了其他初步发现。这进一步证明了FUS在细胞和分子水平上对中枢神经系统疾病的早期治疗的影响,并增强了FUS辅助FUS辅助药物递送和疗效的前提。

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