The M-1 cell line derived from the CD of mice28 (link), was purchased from American Type Culture Collection (ATCC, Manassas, VA). M-1 cells are composed by principal and intercalated cells, this cell model has been validated previously29 (link)–31 (link). Prior to the experiments, M-1 cells were maintained in Dulbecco′s modified Eagle’s medium (DMEM)/F-12 medium (LIFE TECHNOLOGIES, Carlsbad, CA) containing 10% fetal bovine serum (FBS), growth factors (transferrin, insulin, and sodium selenite at physiological concentrations), 100 nmol/L dexamethasone and 5 mM glucose. When the cells reached approximately 70–75% confluence, they were dissociated using trypsin and split into 4-wells chambers and dishes for the trafficking assays.
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