A memory-improving dipeptide, Tyr-Pro, can reach the mouse brain after oral administration

Lihong Cheng, Mitsuru Tanaka, Atsuko Yoshino, Yuki Nagasato, Fuyuko Takata, Shinya Dohgu, Toshiro Matsui

研究成果: ジャーナルへの寄稿学術誌査読

抄録

The transport and accumulation of orally administered functional food-derived peptides in the brain was not fully explored. Thus, in the present study, we aimed to provide critical evidence regarding brain accumulation of a memory-improving soy dipeptide, Tyr-Pro, following oral administration. Stable isotope-labeled Tyr-Pro (Tyr-[13C5,15N]Pro) was orally administered to male ICR mice at 10 or 100 mg/kg. Surprisingly, the intact labeled Tyr-Pro exhibited maximal plasma and brain levels 15 min after administration (plasma: area under the curve [AUC 0–120 min], 1331 ± 267 pmol·min/mL-plasma; brain: AUC 0–120 min of 0.34 ± 0.11 pmol·min/mg-dry brain, at 10 mg/kg). In addition, we detected labeled Tyr-Pro in the brain parenchyma, indicating a validated blood–brain-barrier (BBB) transportability. Moreover, we confirmed the preferable accumulation of Tyr-Pro in the hypothalamus, hippocampus, and cortex with > 0.02 pmol/mg-tissue. In conclusion, we provided the first evidence that orally administered Tyr-Pro at 10 mg/kg directly entered the blood circulation with an absorption ratio of 0.15%, of which 2.5% of Tyr-Pro was transported from the plasma to the mouse brain parenchyma.

本文言語英語
論文番号16908
ジャーナルScientific reports
13
1
DOI
出版ステータス出版済み - 12月 2023

!!!All Science Journal Classification (ASJC) codes

  • 一般

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