Trichostatin A increases the levels of plasma gelsolin and amyloid beta-protein in a transgenic mouse model of Alzheimer's disease

Aims: Gelsolin (GSN), a multifunctional protein, binds to amyloid beta-protein (A beta), inhibits its fibrillization, solubilizes preformed A beta fibrils, and helps in its clearance from the brain. Trichostatin A (TSA), a histone deacetylase (HDAC) inhibitor, induces the protein expression of gelsolin. In the present study, we investigated how TSA-treatment of APPswe/PS1(delta Eg) transgenic (Tg) mice of Alzheimer's disease (AD) will affect the plasma levels of gelsolin and A beta. Main methods: TSA (5 mg/kg body weight on alternate days for two months) was intraperitoneally injected to AD Tg mice. Gelsolin was measured by Western blotting and A beta, was measured by enzyme-linked immunosorbent assay. Key findings: TSA-treatrnent significantly increased the levels of plasma gelsolin by 1.79-fold as compared with vehicle-treated control mice (p < 0.01). The levels of A beta 1-40 and A beta 1-42 in the plasma were also higher in TSA-treated mice in comparison with vehicle-treated mice. The treatment of transgenic AD mice with TSA did not affect the body weight in both male and female groups as compared to vehicle-treated animals. A positive correlation was observed between the plasma levels of gelsolin and A beta 1-40 (r = 0.594, p = 0.042) or A beta 1-42 (r = 0.616, p = 0.033) in AD Tg mice. Significance: These results suggest that TSA increases the levels of plasma gelsolin and A beta in AD Tg mice, which may have implications in gelsolin-mediated clearance of A beta. (C) 2014 Elsevier Inc All rights reserved.