ECT	Electroconvulsive therapy;
TRD	Treatment-resistant depression;
MADRS	Montgomery–Åsberg Depression Rating Scale;
MDD	Major depressive disorder;
ECS	Electroconvulsive stimulation;
E2F1	Early region 2 promoter transcription factor 1;
EDTA	Ethylenediaminetetraacetic acid;
PBMCs	Peripheral blood mononuclear cells;
FSB	3,3′-[(2-fluoro-1,4-phenylene)di-(1E)-2,1-ethenediyl]bis-6-hydroxy-benzoic acid;
DMSO	Dimethyl sulfoxide;
RT-PCR	Reverse transcription polymerase chain reaction;
MOMP	Mitochondrial outer membrane permeabilization;
AMPK	Adenosine monophosphate-activated protein kinase;
RUS	Repeated unpredictable stress;
Cdk2-pRB-E2F1	Cyclin-dependent kinase 2–retinoblastoma protein–E2F1 pathway.