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United States Department of Agriculture

Agricultural Research Service

Research Project: The Effects of Acai Berry Extracts and Its Components on Behavior and Neuronal Function in Aging

Location: Human Nutrition Research Center on Aging

Project Number: 1950-51000-081-02
Project Type: Trust

Start Date: Oct 01, 2009
End Date: Sep 30, 2014

Objective:
In Phase I of this study we will assess various acai berry preparations and compare these with concord grape juice, pomegranate juice and white grape juice to determine if they have similar effects to those previously seen with blueberries. If the acai berry preparations are effective, then two more Phases (II, III) of will be carried out to determine the mechanisms involved in the beneficial effects of these extracts on behavior by assessing alterations in neuronal signaling and autophagy. The third goal of this project will be to determine the effects of the most effective extracts on age-related differences in resistance to oxidative stress/inflammation (OS/INF) by exposing young and old animals to lipopolysaccharide (LPS) an inflammatory agent.

Approach:
In this project we are attempting to investigate the antioxidant anti-inflammatory properties of the acai berry preparations. In Phase 1 of the proposal, the goal is to use freeze dried acai (AC) berries, fresh acai berries, Acai spray dried berries and compare these to concord grape juice, pomegranate juice, white grape juice and california dried plum juice (prune juice and various permutations and combinations of one - seven) to see if they have similar effects to those that we have seen with blueberry (BB) and other berry extracts and juices in cell signaling and to what degree. The specific goals are: 1. Determine the juices that would contribute to reductions in calcium clearance (following depolarization), and oxidant stress (amyloid beta, A(beta)42- induced) or inflammatory (lipolysaccaride, LPS) signaling in mixed glial/primary hippocampal cultures. These treatments will be compared to those of vitamin E, and the NSAID, piroxicam and the eroxisome proliferatoractivated receptor (PPAR gamma) agonist, rosiglitazone against A(beta)42 or LPS treatment. 2. Assess whether the putative beneficial effects on the cells of the ME would involve alterations in stress (e.g., p38 mitogen activated protein kinase, MAPK) signaling, as well as activation of protective signals (e.g., insulin growth factor-1, IGF-1). 3. Determine the stress signal responses of the various mixes in BV-2 mouse microglial cells that are exposed to LPS after treatment with the various extracts. We will purchase the hippocampal cells and the supplies (e.g., antibodies for the stress signals, media, etc) to carry out the cells studies. In Phase II, we propose to assess and compare the benefits of consumption of two different species of acai for improving cognitive and motor function in aging. Specifically, we will assess the efficacy of two different freeze dried acai preparations: 1) acai pulp Euterpe oleracea Mart., EO and 2) acai pulp Euterpe precatoria Mart., DP on the behavior of aged rats. We feel it is necessary to look at the whole fruit before fractionating the berry. In addition, cell studies we are currently conducting using the fractions of the acai berry are not showing any one fraction to be the “most effective” fraction on all of our endpoints. We will then develop mechanistic interpretations of the positive benefits of the acai berry, by assessing the autophagy function (a process involving the recycling and degradation of cellular debris) and signaling pathways. Autophagy, a process involving the recycling and degradation of cellular debris, is a more relevant marker for us to measure.

Last Modified: 7/24/2014
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