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In the present study, trehalose was utilized to improve primary culture of mouse epididymal epithelial cells  in vitro , and to enhance naked DNA delivery in epididymis  in vivo . During the six-day culture, the proliferation activity of the cells in the medium with addition of trehalose was higher than that of those cells cultured in absence of trehalose ( p <0.01). To determine the optimal concentration for cell proliferation, a series of trehalose concentrations (0, 60, 120, 180 mM) were tested, and the result indicated that the cell in the medium with 120 mM trehalose showed the highest proliferation potential. The epididymis epithelial cells were cultured in the medium containing 120 mM trehalose upon 16 th  passage, and they continued expressing markers of epididymal epithelial cell, such as  rE-RABP ,  AR  and  ER-beta . Our study also indicated that trehalose concentrations of 120–240 mM, especially 180 mM, could effectively enhance DNA delivery into the mouse epididymis epithelial cell  in vitro . Moreover, trehalose could induce  in vivo  expression of exogenous DNA in epididymal epithelial cells and help to internalize plasmid into sperm,which did not influence motility of sperm when the mixture of trehalose (180 mM) and DNA was injected into epididymal lumen through efferent tubule. This study suggested that trehalose, as an effective and safer reagent, could be employed potentially to maintain vitality of mouse epididymal epthetial cells during long-term culture  in vitro  and to mediate  in vitro  and  in vivo  gene transfer.

Trehalose Maintains Vitality of Mouse Epididymal Epithelial Cells and Mediates Gene Transfer