Non-specific quantitation of [14C]sucrose in blood and brain has been routinely used as a quantitative measure of the in vivo blood-brain barrier (BBB) integrity. However, the reported apparent brain uptake clearance (Kin) of the marker varies widely (∼100 fold). We investigated the accuracy of the use of the marker in comparison with a stable isotope of sucrose ([13C]sucrose) measured by a specific LC-MS/MS method. Rats received single doses of each marker, and the Kin values were determined. Surprisingly, the Kin value of [13C]sucrose was 6-7 fold lower than that of [14C]sucrose. Chromatographic fractionation after in vivo administration of [14C]sucrose indicated that the majority of the brain content of radioactivity belonged to compounds other than the intact [14C]sucrose. However, mechanistic studies failed to reveal any substantial metabolism of the marker. The water: octanol partition coefficient of [14C]sucrose was > 2 fold higher than that of [13C]sucrose, indicating presence of lipid-soluble impurities in the [14C]sucrose solution. Our data indicate that [14C]sucrose overestimates the true BBB permeability to sucrose. We suggest that specific quantitation of the stable isotope (13C) of sucrose is a more accurate alternative to the current widespread use of the radioactive sucrose as a BBB marker.
Miah MK, Chowdhury EA, Bickel U, Mehvar R. Evaluation of [14C] and [13C]sucrose as blood-brain barrier permeability markers. J Pharm Sci. 2017 Feb 23. pii: S0022-3549(17)30083-7. doi: 10.1016/j.xphs.2017.02.011.
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