Naoki Yuda,1 Miyuki Tanaka,1 Koji Yamauchi,1 Fumiaki Abe,1 Izumi Kakiuchi,2 Kyoko Kiyosawa,2 Mitsunaga Miyasaka,2 Naoki Sakane,3 Masahiko Nakamura4
1Food Ingredients and Technology Institute, Morinaga Milk Industry Co., Ltd., Zama, Kanagawa, Japan; 2Department of Nursing, Matsumoto Junior College, Matsumoto, Nagano, Japan; 3Division of Preventive Medicine, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, Kyoto, Japan; 4Matsumoto City Hospital, Matsumoto, Nagano, Japan
Correspondence: Naoki YudaFood Ingredients and Technology Institute, Morinaga Milk Industry Co., Ltd., 1-83, 5-Chome, Higashihara, Zama, Kanagawa, JapanTel +81 46 252 3051Fax +81 46 252 3017Email n-yuda@morinagamilk.co.jp
Background: Preventative measures have recently been taken to reduce the incidence of Alzheimers disease worldwide. We previously showed that Met-Lys-Pro (MKP), a casein-derived angiotensin-converting enzyme inhibitory peptide with the potential to cross the bloodbrain barrier, attenuated cognitive decline in a mouse model of Alzheimers disease. However, the effect of MKP on cognitive function improvement in humans remains unknown. This exploratory study sought to investigate whether MKP intake could improve cognitive function in adults without dementia.Methods: A total of 268 community-dwelling adults without dementia participated in this 24-week randomized controlled trial. Participants were randomly allocated to the MKP (n = 134) or placebo (n = 134) group. The MKP group received four tablets daily, each containing 50 g MKP, while the placebo group received four dextrin tablets containing no detectable MKP for 24 weeks. Scores on the Japanese version of the cognitive subscale of the Alzheimers Disease Assessment Scale (ADAS-cog) were used as the primary outcome to compare cognitive function between the MKP and placebo groups. The study products were also evaluated for safety.Results: The intention-to-treat analysis showed that there was no significant difference between the groups in terms of the ADAS-cog total score. Orientation, as measured by the respective ADAS-cog subscale, was significantly improved compared to placebo at 24 weeks post-MKP administration (P = 0.022). No serious adverse events due to MKP intake were observed.Conclusion: To the best of our knowledge, this is the first study to report the effects of MKP on human cognition. These preliminary results suggested the safety of daily MKP intake and its potential to improve orientation in adults without dementia. Further clinical studies are needed to confirm the present findings and the benefits of MKP on cognitive function.
Keywords: humans, MKP, cognition, cognitive dysfunction, orientation, Alzheimers disease
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Effect of the Casein-Derived Peptide Met-Lys-Pro on Cognitive Function | CIA - Dove Medical Press
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