AP-1	activator protein-1
COX	cyclooxygenase
CREB	cAMP-responsive element-binding protein
DAG	diacyl glycerol
DOPA	dihydroxyphenylalanine
DCT	dopachrome tautomerase
ERK	extracellular signal-regulated kinase
FITC	fluorescein isothiocyanate
GSK3β	glycogen synthase kinase 3β
IL	interleukin
JNK	c-Jun-N-terminal kinase
MAPK	mitogen-activated protein kinase
MMP	matrix metalloproteinase
MC1R	melanocortin 1 receptor
MITF	microphthalmia-associated transcription factor
MSH	melanocyte stimulating hormone
NO	nitric oxide
NF-κB	nuclear factor-κB
Nrf2	nuclear factor erythroid 2-related factor 2
PLGA	poly(D,L-lactide-co-glycolide)
PKA	protein kinase A
PKC	protein kinase C
PKG	protein kinase G
PM	particulate matter
PTEN	phosphatase and tensin homolog deleted on chromosome 10
ROS	reactive oxygen species
SCF	stem cell factor
siRNA	small interfering RNA
SPF	sun protection factor
TNF-α	tumor necrosis factor-α
TPGS	tocopheryl polyethylene glycol 1000 succinate
TUNEL	terminal deoxynucleotidyl transferase dUTP nick end labeling
TYR	tyrosinase
TYRP1	tyrosinase-related protein 1
UV	ultraviolet
UVA-PF	UVA-protection factor