BACKGROUND: Reliable biomarkers for monitoring disease activity have not been clinically established in ulcerative colitis (UC). This study aimed to investigate whether levels of serum leucine-rich alpha-2 glycoprotein (LRG), identified recently as a potential disease activity marker in Crohn's disease and rheumatoid arthritis, correlate with disease activity in UC. METHODS: Serum LRG concentrations were determined by enzyme-linked immunosorbent assay (ELISA) in patients with UC and healthy controls (HC) and were evaluated for correlation with disease activity. Expression of LRG in inflamed colonic tissues from patients with UC was analyzed by western blotting and immunohistochemistry. Interleukin (IL)-6-independent induction of LRG was investigated using IL-6-deficient mice by lipopolysaccharide (LPS)-mediated acute inflammation and dextran sodium sulfate (DSS)-induced colitis. RESULTS: Serum LRG concentrations were significantly elevated in active UC patients compared with patients in remission (P < 0.0001) and HC (P < 0.0001) and were correlated with disease activity in UC better than C-reactive protein (CRP). Expression of LRG was increased in inflamed colonic tissues in UC. Tumor necrosis factor alpha (TNF-α), IL-6, and IL-22, serum levels of which were elevated in patients with active UC, could induce LRG expression in COLO205 cells. Serum LRG levels were increased in IL-6-deficient mice with LPS-mediated acute inflammation and DSS-induced colitis. CONCLUSIONS: Serum LRG concentrations correlate well with disease activity in UC. LRG induction is robust in inflamed colons and is likely to involve an IL-6-independent pathway. Serum LRG is thus a novel serum biomarker for monitoring disease activity in UC and is a promising surrogate for CRP.
BACKGROUND: Reliable biomarkers for monitoring disease activity have not been clinically established in ulcerative colitis (UC). This study aimed to investigate whether levels of serum leucine-rich alpha-2 glycoprotein (LRG), identified recently as a potential disease activity marker in Crohn's disease and rheumatoid arthritis, correlate with disease activity in UC. METHODS: Serum LRG concentrations were determined by enzyme-linked immunosorbent assay (ELISA) in patients with UC and healthy controls (HC) and were evaluated for correlation with disease activity. Expression of LRG in inflamed colonic tissues from patients with UC was analyzed by western blotting and immunohistochemistry. Interleukin (IL)-6-independent induction of LRG was investigated using IL-6-deficient mice by lipopolysaccharide (LPS)-mediated acute inflammation and dextran sodium sulfate (DSS)-induced colitis. RESULTS: Serum LRG concentrations were significantly elevated in active UC patients compared with patients in remission (P < 0.0001) and HC (P < 0.0001) and were correlated with disease activity in UC better than C-reactive protein (CRP). Expression of LRG was increased in inflamed colonic tissues in UC. Tumor necrosis factor alpha (TNF-α), IL-6, and IL-22, serum levels of which were elevated in patients with active UC, could induce LRG expression in COLO205 cells. Serum LRG levels were increased in IL-6-deficient mice with LPS-mediated acute inflammation and DSS-induced colitis. CONCLUSIONS: Serum LRG concentrations correlate well with disease activity in UC. LRG induction is robust in inflamed colons and is likely to involve an IL-6-independent pathway. Serum LRG is thus a novel serum biomarker for monitoring disease activity in UC and is a promising surrogate for CRP.
Authors: Quan Hong; Hong Cai; Lu Zhang; Zhengzhe Li; Fang Zhong; Zhaohui Ni; Guangyan Cai; Xiang-Mei Chen; John Cijiang He; Kyung Lee Journal: Kidney Int Date: 2021-11-10 Impact factor: 10.612
Authors: Philipp Lenz; Markus Brückner; Steffi Ketelhut; Jan Heidemann; Björn Kemper; Dominik Bettenworth Journal: J Vis Exp Date: 2016-09-13 Impact factor: 1.355
Authors: Markus Brückner; Philipp Lenz; Marcus M Mücke; Faekah Gohar; Peter Willeke; Dirk Domagk; Dominik Bettenworth Journal: World J Gastroenterol Date: 2016-01-21 Impact factor: 5.742
Authors: Kuin Tian Pang; Mean Ghim; Chenghao Liu; Hui Min Tay; Chee Wai Fhu; Rui Ning Chia; Beiying Qiu; Padmini Sarathchandra; Adrian H Chester; Magdi H Yacoub; Fiona L Wilkinson; Ria Weston; Christina M Warboys; Han Wei Hou; Peter D Weinberg; Xiaomeng Wang Journal: Front Cell Dev Biol Date: 2021-07-05