Combination Therapy with Octyl Gallate and Ferulic Acid Improves Cognition and Neurodegeneration in a Transgenic Mouse Model of Alzheimer Disease [Molecular Bases of Disease]

To date, there is no effective Alzheimer 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 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 significantly improved cognitive function versus OG or FA single treatment on some (but not all) measures. We also observed statistically significant further reductions in brain parenchymal and cerebral vascular β-amyloid deposits and 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-carboxyl-terminal 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 benefit on some, but not all, of these outcome measures. Taken together, these data provide pre-clinical proof-of-concept for AD combination therapy.

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