Platform for micro-invasive membrane-free biochemical sampling of brain interstitial fluid.

Abstract:

:Neurochemical dysregulation underlies many pathologies and can be monitored by measuring the composition of brain interstitial fluid (ISF). Existing in vivo tools for sampling ISF do not enable measuring large rare molecules, such as proteins and neuropeptides, and thus cannot generate a complete picture of the neurochemical connectome. Our micro-invasive platform, composed of a nanofluidic pump coupled to a membrane-free probe, enables sampling multiple neural biomarkers in parallel. This platform outperforms the state of the art in low-flow pumps by offering low volume control (single stroke volumes, <3 nl) and bidirectional fluid flow (<100 nl/min) with negligible dead volume (<30 nl) and has been validated in vitro, ex vivo, and in vivo in rodents. ISF samples (<1.5 μL) can be processed via liquid chromatography-tandem mass spectrometry. These label-free liquid biopsies of the brain could yield a deeper understanding of the onset, mechanism, and progression of diverse neural pathologies.

journal_name

Sci Adv

journal_title

Science advances

authors

Raman R,Rousseau EB,Wade M,Tong A,Cotler MJ,Kuang J,Lugo AA,Zhang E,Graybiel AM,White FM,Langer R,Cima MJ

doi

10.1126/sciadv.abb0657

subject

Has Abstract

pub_date

2020-09-25 00:00:00

issue

39

issn

2375-2548

pii

6/39/eabb0657

journal_volume

6

pub_type

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