. After incubation in 2 mM thymidine (Sigma-Aldrich, T1895) for 19h, PBS washes, collection using trypsin-EDTA (Thermo Fisher Scientific, 15400054), and centrifugation, cells were treated with Snap-Cell substrates to label old mitochondria, washed, and plated on cell culture dishes, or poly-L-lysine (Merck Millipore, A-005-C, final concentration 1 μg/ml) coated 35 mm glass bottom dishes (MatTek, P35G-1.5-14-C). After 10 hours, thymidine was added for 17 hours, cells washed and returned to MEGM. Cells divided 21-26h after the second thymidine release 21 (link)
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Snap-Cell Block or Snap-Cell substrates (New England Biolabs) were applied for 30min at 37°C as indicated, diluted in full MEGM with 0.5% BSA (Thermo Fisher Scientific, 15260037) at 5-10μM (Snap-Cell Block S9106S), 1.5-3μM (Snap-Cell 647-SiR S9102S), 3μM (Snap-Cell TMR-Star S9105S), 5μM (Snap-Cell 430 S9109S), 5μM (Snap-Cell Oregon Green S9104S).