The American journal of gastroenterology · 2007
Expression of PD-1, PD-L1, and PD-L2 in the liver in autoimmune liver diseases.
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Mataki Norikazu, Kikuchi Kentaro, Kawai Toshihiro, Higashiyama Masaaki, Okada Yoshikiyo, Kurihara Chie, Hokari Ryota, Kawaguchi Atsushi, Nagao Shigeaki, Kondo Toshiro, Itoh Kazuro, Miyakawa Hiroshi, Miura Soichiro
Аннотация
OBJECTIVES: PD-L1 (also B7-H1) and PD-L2 (also B7-DC) are ligands for programmed death-1 (PD-1), which is a member of the CD28/B7 superfamily of costimulatory molecules and plays an inhibitory role on the periphery. Impaired regulation of this system may cause disruption to self-tolerance leading to autoimmunity; however, the role of these molecules in the liver is unknown. Therefore, we examined the expression of PD-1, PD-L1, and PD-L2 in the liver in autoimmune liver diseases.
METHODS: We examined the liver expression of these molecules in autoimmune hepatitis (AIH) and primary biliary cirrhosis (PBC) with no previous medical treatment using immunohistochemical staining and real-time PCR, and compared with chronic hepatitis type C (CHC) as a control.
RESULTS: Although PD-1, PD-L1, and PD-L2 were expressed in the liver in AIH, PBC, as well as CHC, the expressions were relatively lower in PBC. In AIH, despite more severe inflammation than in CHC, the expression of these molecules was not greater than in CHC, and when compared with the relative expression of PD-L1, PD-L2 was lower in AIH. PD-L1 and PD-L2 expressions were well correlated with the level of IFN-gamma; however, relatively decreased induction for PD-L1 and PD-L2 by IFN-gamma was observed in AIH or PBC than in CHC.
CONCLUSION: Modulation of PD-1/PD-L1 and PD-L2 systems may play a role in the development of autoimmune liver diseases.
METHODS: We examined the liver expression of these molecules in autoimmune hepatitis (AIH) and primary biliary cirrhosis (PBC) with no previous medical treatment using immunohistochemical staining and real-time PCR, and compared with chronic hepatitis type C (CHC) as a control.
RESULTS: Although PD-1, PD-L1, and PD-L2 were expressed in the liver in AIH, PBC, as well as CHC, the expressions were relatively lower in PBC. In AIH, despite more severe inflammation than in CHC, the expression of these molecules was not greater than in CHC, and when compared with the relative expression of PD-L1, PD-L2 was lower in AIH. PD-L1 and PD-L2 expressions were well correlated with the level of IFN-gamma; however, relatively decreased induction for PD-L1 and PD-L2 by IFN-gamma was observed in AIH or PBC than in CHC.
CONCLUSION: Modulation of PD-1/PD-L1 and PD-L2 systems may play a role in the development of autoimmune liver diseases.
Предметные рубрики MeSH
Antigens, CDApoptosis Regulatory ProteinsB7-H1 AntigenBiomarkersBiopsy, NeedleDiagnosis, DifferentialFemaleFlow CytometryGene ExpressionHepatitis, AutoimmuneHumansImmunohistochemistryIntercellular Signaling Peptides and ProteinsLymphocyte ActivationMaleMiddle AgedPrognosisProgrammed Cell Death 1 Ligand 2 ProteinProgrammed Cell Death 1 ReceptorRNA, MessengerReverse Transcriptase Polymerase Chain Reaction