Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, USA.
Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, USA.
Cell Rep Methods. 2024 Feb 26;4(2):100709. doi: 10.1016/j.crmeth.2024.100709. Epub 2024 Feb 14.
We establish a reliable method for selectively delivering adeno-associated viral vectors (AAVs) across the blood-brain barrier (BBB) in the marmoset without the need for neurosurgical injection. We focally perturbed the BBB (∼1 × 2 mm) in area 8aD of the frontal cortex in four adult marmoset monkeys using low-intensity transcranial focused ultrasound aided by microbubbles. Within an hour of opening the BBB, either AAV2 or AAV9 was delivered systemically via tail-vein injection. In all four marmosets, fluorescence-encoded neurons were observed at the site of BBB perturbation, with AAV2 showing a sparse distribution of transduced neurons when compared to AAV9. The results are compared to direct intracortical injections of anterograde tracers into area 8aD and similar (albeit sparser) long-range connectivity was observed. With evidence of transduced neurons specific to the region of BBB opening as well as long-distance tracing, we establish a framework for focal noninvasive transgene delivery to the marmoset brain.
我们建立了一种可靠的方法,可在不进行神经外科注射的情况下,选择性地将腺相关病毒载体 (AAV) 递送到狨猴的血脑屏障 (BBB) 中。我们使用低强度经颅聚焦超声辅助微泡,在成年狨猴的额皮质 8aD 区局部扰乱 BBB(约 1 × 2 毫米)。在 BBB 打开后的一个小时内,通过尾静脉注射系统地递送电镜编码的 AAV2 或 AAV9。在所有四只狨猴中,在 BBB 扰乱部位都观察到了荧光编码的神经元,与 AAV9 相比,AAV2 显示出转导神经元的稀疏分布。结果与直接向 8aD 区进行顺行示踪剂的皮质内注射进行了比较,观察到类似(尽管更稀疏)的长程连接。通过证明转导神经元是特异性针对 BBB 开放区域以及长距离示踪的,我们为狨猴大脑的焦点非侵入性转基因传递建立了一个框架。