Characteristics of SLAspecific T cell response and its clinical significance in autoimmune hepatitis patients
ZHAO Yan, TAN Yu-fen, FENG Xia, MA Dong-mei, ZHANG Xin, YAN Hui-ping
Published 2010-08-11
Cite as Chin J Lab Med, 2010,33(08): 723-727. DOI: 10.3760/cma.j.issn.1009-9158.2010.08.004
Abstract
:Objective To analyze the feature of SLA specific T cellresponse in AIH. Methods Thirtyone cases of AIH were enrolled by investigating T-cellreactivity against chemically synthesized peptides spanning the full SLA protein usingELISpot. The 31 cases of AIH included 10 anti-SLA/LP positive cases and 21 negative cases.The control groups included 30 PBC patients, 29 chronic viral hepatitis patients and 30healthy cases. The secretion of IFN-γ after PBMC stimulated by SLA peptides was observed.Results Eighteen of 31 cases with AIH [56. 08 % ( 18/31 ) ] showed the positive responseto SLA peptide pools, and only 1 of 30 patients with primary biliary cirrhosis (3.34%) and1 of 29 patients with virus hepatitis ( 3.44% ), could be elicited responses by SLApeptide pools. There wasn't positive response in healthy eases. The response frequency toSLA peptides in AIH group was significantly higher than those in PBC cases, chronic viralhepatitis cases and healthy cases (X2 = 21. 295, 20. 655, 15.988, P < 0. 01 ). Amongst18 AIH patients with positive responds to SLA pool, 8 antigen clusters including aa 1-44,aa 57-132, an 129-180,aa 177-196, aa 193-244, aa 241-268, aa 281-308 and aa 321-428 werehighlighted. The mean number of recognized peptides was 6 (2-17), indicating thepolyclonal feature. Fourteen of 18 AIH patients with positive response to SLA peptideswere subjected to live function test simultaneously when PBMC were collected. There wassignificant correlation between the breadth of recognized poptides and AST ( logarithm, r= 0. 539, P = 0. 045). Conclusions SLA peptides can induce PBMC in peripheral blood of AIHpatients to secrete IFN-γ and it is polyclonal response. The breadth of recognizedpeptides may reflect the degree of liver inflammation.
Key words:
Hepatitis,autoimmune; Autoantige
Contributor Information
ZHAO Yan
Centerof Autoimmune Liver Disease,Beijing You'an Hospital,Capital Medical University,Beijing100069,China
TAN Yu-fen
Center of Autoimmune LiverDisease,Beijing You'an Hospital,Capital Medical University,Beijing 100069,China
FENG Xia
Center of Autoimmune LiverDisease,Beijing You'an Hospital,Capital Medical University,Beijing 100069,China
MA Dong-mei
Center of Autoimmune LiverDisease,Beijing You'an Hospital,Capital Medical University,Beijing 100069,China
ZHANG Xin
Center of Autoimmune LiverDisease,Beijing You'an Hospital,Capital Medical University,Beijing 100069,China
YAN Hui-ping
Center of Autoimmune Liver Disease,Beijing You'an Hospital,CapitalMedical University,Beijing 100069,China