Isolated hepatocytes (12,000 per well) were seeded into a
Seahorse XF96 cell culture plate (Agilent Technologies) after having been coated with collagen. Cells were kept in recovery media for 4 – 6 h and then washed with DMEM media (low glucose plus 10% FBS) and incubated overnight (DMEM low glucose (5 mM) with 10% FBS, 1 nM insulin, 1 nM dexamethasone, and antibiotics (10,000 units/mL
penicillin and 10 mg/mL
streptomycin, Invitrogen). The following morning, cells were washed and incubated in 180 μL of prewarmed (~37°C) DMEM base media (
D5030, Sigma) supplemented with 2mM L-glutamine, 24mM bicarbonate, 10mM HEPES and 0.2% BSA with or without PKa 10μM and equilibrated in a ~37°C non CO2 incubator for 1 h prior to the study. Basal oxygen consumption was observed followed by the addition of the gluconeogenic substrate combination of pyruvate (1 mM) and lactate (9 mM). Chemical stimulants for assessing mitochondrial function were subsequently injected following the substrate addition in the following order; oligomycin 5 μM, FCCP 10 μM and rotenone 5 μM. Measurements of oxygen consumption rate were taken, and the average of the measurements after each injection was used for analysis.
Abulizi A., Cardone R.L., Stark R., Lewandowski S.L., Zhao X., Hillion J., Ma L., Sehgal R., Alves T.C., Thomas C., Kung C., Wang B., Siebel S., Andrews Z.B., Mason G.F., Rinehart J., Merrins M.J, & Kibbey R.G. (2020). Multi-Tissue Acceleration of the Mitochondrial Phosphoenolpyruvate Cycle Improves Whole-Body Metabolic Health. Cell metabolism, 32(5), 751-766.e11.