Combination therapy with octyl gallate and ferulic acid improves cognition and neurodegeneration in a transgenic mouse model of Alzheimer's disease.

Abstract

To date, there is no effective Alzheimer's disease (AD)-modifying therapy. Nonetheless, combination therapy holds promise, and nutraceuticals (natural dietary compounds with therapeutic properties) and their synthetic derivatives are well-tolerated candidates. We tested whether combination therapy with octyl gallate (OG) and ferulic acid (FA) improves cognition and mitigates AD-like pathology in the presenilin-amyloid β-protein precursor (PSAPP) transgenic mouse model of cerebral amyloidosis. One-year-old mice with established β-amyloid plaques received daily doses of OG and FA alone or in combination for 3 months. PSAPP mice receiving combination therapy had statistically significant improved cognitive function versus OG or FA single treatment on some (but not all) measures. We also observed additional statistically significant reductions in brain parenchymal and cerebral vascular β-amyloid deposits as well as brain amyloid β-protein abundance in OG- plus FA-treated versus singly-treated PSAPP mice. These effects coincided with enhanced nonamyloidogenic amyloid β-protein precursor (APP) cleavage, increased α-secretase activity, and β-secretase inhibition. We detected elevated expression of nonamyloidogenic soluble APP-α and the α-secretase candidate, a disintegrin and metalloproteinase domain-containing protein 10. Correspondingly, amyloidogenic β-carboxyl-terminal APP fragment and β-site APP-cleaving enzyme 1 expression levels were reduced. In parallel, the ratio of β- to α-carboxyl-terminal APP fragment was decreased. OG and FA combination therapy strikingly attenuated neuroinflammation, oxidative stress, and synaptotoxicity. Co-treatment afforded additional statistically significant benefits on some, but not all, of these outcome measures. Taken together, these data provide preclinical proof-of-concept for AD combination therapy.

• Authors: Takashi Mori, Naoki Koyama, Jun Tan, Tatsuya Segawa, Masahiro Maeda, Terrence Town
• Journal: The Journal of biological chemistry (J Biol Chem) Vol. 292 Issue 27 Pg. 11310-11325 (07 07 2017) ISSN: 1083-351X [Electronic] United States
• PMID: 28512130 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural)
• Copyright: © 2017 by The American Society for Biochemistry and Molecular Biology, Inc.

Chemical References

• APP protein, human
• Amyloid beta-Protein Precursor
• Coumaric Acids
• octyl gallate
• Gallic Acid
• ferulic acid
• Amyloid Precursor Protein Secretases

Topics

• Alzheimer Disease (drug therapy, genetics, metabolism, pathology)
• Amyloid Precursor Protein Secretases (genetics, metabolism)
• Amyloid beta-Protein Precursor (genetics, metabolism)
• Animals
• Cognition (drug effects)
• Coumaric Acids (pharmacology)
• Disease Models, Animal
• Drug Therapy, Combination
• Gallic Acid (analogs & derivatives, pharmacology)
• Humans
• Mice
• Mice, Transgenic