Abstract
Two experiments were conducted to investigate the kinetics of manganese (Mn) transport in Caco-2 cell monolayers and the gene expressions of Mn transport carriers in apical (AP) and basolateral (BL) membranes. In experiment 1, the cells were treated with the medium containing 146 μmol/L of Mn (MnSO4·H2O). Both the uptake and transport of Mn from AP–BL or from BL–AP at different time-points were assessed to determine the optimal time for kinetics of Mn transport. The transport of Mn increased linearly with higher efficiency values in AP–BL than in BL–AP direction, however, the uptake of Mn revealed an asymptotic pattern within 120 min. In experiment 2, the kinetics of Mn transport in AP–BL was determined with media containing Mn concentrations from 0 to 2,500 μmol/L at 40 and 120 min, respectively, and mRNA levels of divalent metal transporter 1 (DMT1) and ferroportin (FPN1) were determined in Caco-2 cells treated with the medium containing 0 or 800 μmol/L of Mn for 120 min. The kinetics of Mn transport showed a carrier-mediated process when Mn concentrations were lower than 1,000 μmol/L and a linear increment when Mn concentrations exceeded 1,000 μmol/L at either 40 or 120 min. Mn treatment decreased (P < 0.01) DMT1 mRNA level and increased (P < 0.01) FPN1 mRNA level. The results from the present study suggested that Mn transport in AP–BL fit both carrier-mediated saturable and non-saturable diffusion processes, and Mn transport carriers DMT1 and FPN1 mediate the apical uptake and basolateral exit of Mn in Caco-2 cells.
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Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (project no. 31272465; Beijing, P. R. China), the Key International Cooperation Program of the National Natural Science Foundation of China (project no. 31110103916; Beijing, P. R. China) and China Agriculture Research System (project no. CARS-42; Beijing, P. R. China).
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Li, X., Xie, J., Lu, L. et al. Kinetics of manganese transport and gene expressions of manganese transport carriers in Caco-2 cell monolayers. Biometals 26, 941–953 (2013). https://doi.org/10.1007/s10534-013-9670-y
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DOI: https://doi.org/10.1007/s10534-013-9670-y