P-gp	P-glycoprotein
ABC	ATP-binding cassette
ABCB1	ATP-binding cassette subfamily B member 1
ADME	Absorption, distribution, metabolism, and excretion
ARS	Acute radiation syndrome
Caco-2	Caucasian colon adenocarcinoma-2
CAD	Collision-activated dissociation
CAT	Catalase
CE	Collision energy
DAPI	4’,6-diamidinyl-2-phenylindole
DEGs	Differentially expressed genes
DMEM	Dulbecco’s modified eagle medium
DP	Declustering potential
DSBs	DNA double-strand breaks
EP	Entrance potential
ER	Efflux ratio
ESI	Electrospray ionization
FBS	Fetal bovine serum
GO	Gene Ontology
GSH	Glutathione
HBSS	Hank’s Balanced Salt Solution
HK-2	Human kidney-2
HO-1	Heme oxygenase-1
IEC-6	Intestinal epithelial cell line 6
IHC	Immunohistochemistry
IR	Irradiation
KEGG	Kyoto Encyclopedia of Genes and Genomes
LC-MS/MS	Liquid chromatography–tandem mass spectrometry
MRM	Multiple reaction monitoring
Nrf2	Nuclear factor erythroid 2-related factor 2
Papp	Apparent permeability coefficients
PBS	Phosphate-buffered saline
PCA	Principal component analysis
Peff	Effective permeability
qRT-PCR	Real-time quantification polymerase chain reaction
SOD	Superoxide dismutase
SPF	Specific-pathogen-free
TBA	Total bile acid
TEER	Transepithelial electrical resistance
ZO-1	Zonula occludens-1