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Tetradecyl 2,3-dihydroxybenzoate, termed ABG001, has been reported to enhance neurite outgrowth of PC12 cells. Herein, we report that oral administration of ABG001 for five days to adult male mice could dose-dependently enhance survival and neurite growth of newborn cells in hippocampal dentate gyrus (DG) without changes in cell proliferation and differentiation of progenitor cells. The ABG001 administration (0.5 mg/kg) enhanced the phosphorylation of tyrosine kinase A (TrkA) receptor, which induced increases in the levels of ERK, Akt and mTOR phosphorylation in hippocampus. The pro-neurogenesis of ABG001 was blocked by the TrkA receptor inhibitor K252a. By contrast, the ERK inhibitor U0126 attenuated only the ABG001-increased number of newborn cells, while the PI3K inhibitor LY294002 prevented mainly the ABG001-enhanced neurite growth. In comparison with control mice, the mice treated with ABG001 showed a more preferential spatial cognitive function as assessed by Morris water maze and Y maze tests, which was sensitive to the blockade of TrkA receptor. In addition, a single injection (i.c.v.) of 'aggregated' Aβ 25-35 in adult male mice (Aβ 25-35-mice) impaired spatial memory, survival and neurite growth of newborn cells in the DG with reduced phosphorylation of Akt and mTOR. The treatment of Aβ 25-35-mice with ABG001 could protect the survival and neurite growth of newborn cells through increasing TrkA receptor-induced phosphorylation of Akt and mTOR, which was accompanied by the improvement of spatial cognitive performance.

Pro-neurogenesis and anti-dementia properties of tetradecyl 2,3-dihydroxybenzoate through TrkA receptor-mediated signalling pathways