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538533 
Journal Article 
Vizilizumab induces apoptosis of mucosal T lymphocytes in ulcerative colitis through activation of caspase 3 and 8 dependent pathways 
Yu, QT; Saruta, M; Papadakis, KA 
2008 
Yes 
Clinical Immunology
ISSN: 1521-6616
EISSN: 1521-7035 
127 
3 
322-329 
English 
Visilizumab, a humanized low-Fc receptor binding anti-CD3 antibody, induces rapid clinical response in patients with steroid-refractory ulcerative colitis (UC). Several effective treatments in (IBD) have been linked to the induction of mucosal T cell apoptosis. The aim of the present study was to evaluate the effect of visilizumab on the apoptosis of lamina propria (LP) and peripheral blood (PB) lymphocytes isolated from patients with UC. Visilizumab induced dose- and time-dependent apoptosis of LP T cells isolated from non-IBD individuals, UC or CD patients. Maximal effect was seen at a concentration of 100 ng/ml and it was 33% for normal, 34% for UC and 23% for CD LP T cells following 24 h stimulation. Visilizumab induced apoptosis predominantly of CD4(+) LP T cells, whereas CD8(+) LP T cells were relatively resistant to apoptosis. Visilizumab did not induce apoptosis of PB T cells from UC patients. Visilizumab-induced apoptosis of LP T cells was dependent on caspase 3 and 8, but not caspase 9 activation and did not involve the Fas/FasL pathway. Low-Fc receptor binding Abs such as visilizumab may be highly effective for the treatment of UC through induction of apoptosis of LP T cells and rapid elimination of lesional pathogenic T cells in the gut mucosa. (c) 2008 Elsevier Inc. All rights reserved. 
visilizumab; low-Fc receptor binding; anti-CD3 antibodies; inflammatory; bowel diseases; mucosal T lymphocytes; apoptosis; ulcerative colitis; Crohn's disease; anti-cd3 monoclonal-antibody; inflammatory-bowel-disease; crohns-disease; lamina propria; cells; infliximab; unresponsiveness; visilizumab; chimpanzees; mechanisms