Project Number: 1950-51000-063-10
Project Type: Trust

Start Date: Feb 01, 2005
End Date: Jan 31, 2010

Objective:
AIM 1: Determine the effects of SB supplementation on behavioral aging using paradigms sensitive to cognitive (short and long-term memories) behaviors. AIM 2: Determine the effects of SB supplementation on calcium dependent and neuronal signaling (2) and neurogenesis (2b) correlate these with alterations in behavioral parameters determined in SA 1. AIM 3: Determine whether the efficacies of these supplementations in the behavioral assays are associated with enhanced resistance to oxidative stress or inflammation.

Approach:
Aim 1. The effects of SB dietary supplementation (2% SB extract in the diet for 8 weeks. After 8 weeks performance will be examined in the rats using age-sensitive cognitive behaviors that are selective for reference and working memories. The latter behaviors will be assessed using the Morris water maze and the radial arm water maze, as well as novelty tests. All of these tests have been validated as being age sensitive (e.g. demonstrated a significant decline as a function of age). Aim 2. The effects of SB dietary supplementation on neurogenesis and differentiation will be examined using immunocytochemistry, bromodeoxyuridine (BrDU) incorporation in hippocampus and olfactory bulb obtained from the supplemented behaviorally-assessed animals Calcium signaling will be assessed by examining Ca45 clearance in tissues (as above) taken from the brain. Aim 3. For the basal assessments we will use immunohistochemistry to assess various markers of oxidative stress (e.g., HO-1) and inflammation (e.g., cytokines) as well as immunoblotting to detect HO-1 and bcl 2 expression. The responses of the tissue (muscarinic receptor sensitivity, HSP-70 activation) to oxidant (hydrogen peroxide, 10 uM) or inflammatory (LPS) stressors will be assessed by exposing cross-cut slices of the various brain regions obtained from the supplemented animals.