Analysis of nitroxyl spin probes in mouse brain by X-band ESR with microdialysis technique

Journal of Pharmaceutical Sciences
Takeshi ShibaH Utsumi

Abstract

Stable nitroxyl radicals are widely used in electron spin resonance (ESR) studies in vivo to determine ROS generation, but there are insufficient data on how their distribution to various tissues, excretion, and/or systemic signal decay affect the signal decay in a region of interest. Here, we evaluated the level of spin probe in the brain using a microdialysis combined with X-band ESR spectroscopy, to clarify the BBB permeability of different spin probes. We also determined the association between PROXYL spin probe signal decay in the head and the probe's level in the brain, its excretion in urine, and its rate of signal decay in other areas and tissues. Dialysate recovered from the mouse prefrontal cortex was used to determine the total spin probe level in the brain by X-band ESR spectroscopy. There was a positive correlation between the level of spin probes in the brain and their partition coefficients. Furthermore, the in vivo decay rate of the nitroxyl radical signal in the head was associated with the probes' level in the brain, but not with its systemic signal decay rate or excretion into urine. These basic data may support the use of PROXYLs as site-specific ROS probes in the brain.

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Citations

Sep 19, 2009·Hypertension Research : Official Journal of the Japanese Society of Hypertension·Shuichiro ArakiKenji Sunagawa
Jun 26, 2009·Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism·Mayumi YamatoHideo Utsumi
Apr 27, 2017·Magnetic Resonance in Chemistry : MRC·D David JebarajA Milton Franklin Benial

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