1T	1 time/day
2T	2 times/day
4-HNE	4-hydroxy-2-nonenal
AMG	amygdala
ANOVA	analysis of variance
BAX	Bcl2-associated X
CCI	chronic constriction of the sciatic nerve
CNP	chronic neuropathic pain
CNS	central nervous system
CO	carbon monoxide
CoPP	cobalt protoporphyrin IX
DMSO	dimethyl sulfoxide
DRG	dorsal root ganglia
EPM	elevated plus maze
FST	forced swimming test
H2	molecular hydrogen
H2S	hydrogen sulfide
GAPDH	glyceraldehyde-3-phosphate dehydrogenase
HO-1	heme oxygenase 1
HRS	hydrogen-rich saline
HRW	hydrogen-rich water
KATP	ATP sensitive potassium
NF-κB	nuclear factor-κB
NQO1	NAD(P)H: quinone oxidoreductase 1
Nrf2	nuclear erythroid factor 2-related factor 2
p-Akt	phosphorylated protein kinase B
PBST	phosphate-buffered saline plus Tween 20
p-IKBα	phosphorylated-NF-κB inhibitor alpha
PI3K	phosphoinositide 3-kinase
PNS	peripheral nervous system
ROS	reactive oxygen species
SEM	standard error of the mean
SnPP	tin protoporphyrin IX
SOD-1	superoxide dismutase 1
TBST	Tris-buffered saline plus Tween 20
TST	tail suspension test
VEH	vehicle