BACKGROUND:Anti-TNFalpha therapy with infliximab is effective for Crohn's disease. Infliximab neutralizes the biological activities of TNFalpha, a cytokine involved in host-defence against certain infections. AIM: To evaluate the effects of infliximab on the gut and peripheral immune system functions. METHODS: Biopsies and blood samples from three clinical trials of infliximab in Crohn's disease were analysed. Pharmacokinetics, changes in leucocyte counts and T cell subsets, T cell function, and cytokine profiles of lamina propria mononuclear cells (LPMC) and peripheral blood mononuclear cells (PBMC) were analysed. RESULTS:Infliximab has a serum half-life of 9.5 days and is still detectable in serum 8 weeks after infusion. Leucocyte counts showed consistent changes from baseline toward normal values after therapy. Monocytes and lymphocytes were modestly increased, while neutrophils were decreased 4 weeks after treatment. Lymphocyte subsets and T cell proliferative responses were not altered after therapy. The proportion of PBMCs capable of producing IFNgamma and TNFalpha did not change, while Th1 cytokine production by stimulated LPMC was decreased after infliximab therapy. CONCLUSION: The clinical efficacy of infliximab is based on local anti-inflammatory and immunomodulatory effects in the bowel mucosa, without generalized suppression of systemic immune functions in Crohn's disease patients.
RCT Entities:
BACKGROUND: Anti-TNFalpha therapy with infliximab is effective for Crohn's disease. Infliximab neutralizes the biological activities of TNFalpha, a cytokine involved in host-defence against certain infections. AIM: To evaluate the effects of infliximab on the gut and peripheral immune system functions. METHODS: Biopsies and blood samples from three clinical trials of infliximab in Crohn's disease were analysed. Pharmacokinetics, changes in leucocyte counts and T cell subsets, T cell function, and cytokine profiles of lamina propria mononuclear cells (LPMC) and peripheral blood mononuclear cells (PBMC) were analysed. RESULTS:Infliximab has a serum half-life of 9.5 days and is still detectable in serum 8 weeks after infusion. Leucocyte counts showed consistent changes from baseline toward normal values after therapy. Monocytes and lymphocytes were modestly increased, while neutrophils were decreased 4 weeks after treatment. Lymphocyte subsets and T cell proliferative responses were not altered after therapy. The proportion of PBMCs capable of producing IFNgamma and TNFalpha did not change, while Th1 cytokine production by stimulated LPMC was decreased after infliximab therapy. CONCLUSION: The clinical efficacy of infliximab is based on local anti-inflammatory and immunomodulatory effects in the bowel mucosa, without generalized suppression of systemic immune functions in Crohn's diseasepatients.
Authors: Akihiro Yamada; Yuga Komaki; Nayan Patel; Fukiko Komaki; Arthur S Aelvoet; Anthony L Tran; Joel Pekow; Sushila Dalal; Russell D Cohen; Lisa Cannon; Konstantin Umanskiy; Radhika Smith; Roger Hurst; Neil Hyman; David T Rubin; Atsushi Sakuraba Journal: Am J Gastroenterol Date: 2017-07-18 Impact factor: 10.864
Authors: Chaya Shwaartz; Adam C Fields; Maximiliano Sobrero; Brian D Cohen; Celia M Divino Journal: J Gastrointest Surg Date: 2016-07-12 Impact factor: 3.452
Authors: A Di Sabatino; R Ciccocioppo; B Cinque; D Millimaggi; R Morera; L Ricevuti; M G Cifone; G R Corazza Journal: Gut Date: 2004-01 Impact factor: 23.059