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Erschienen in:
23.08.2021 | Original Article
Repeated Stimulation of Toll-Like Receptor 2 and Dectin-1 Induces Chronic Pancreatitis in Mice Through the Participation of Acquired Immunity
Erschienen in: Digestive Diseases and Sciences | Ausgabe 8/2022
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Background
Stimulation of Toll-like receptor 3 (TLR3) induces autoimmune-mediated pancreatitis in susceptible mice, whereas stimulation of TLR4 causes nonautoimmune-mediated pancreatitis. However, the effects of TLR2 stimulation on the pancreas are unknown.
Aims
We investigated the role of TLR2 stimulation on pancreatic damage by repeatedly stimulating mice with TLR2 ligands.
Methods
Wild-type (WT) and interleukin 10-deficient (IL-10-knockout (KO)) mice were administered zymosan and lipoteichoic acid (LTA) intraperitoneally at various doses twice weekly for 4 weeks. Syngeneic T-cell-deficient mice, B-cell-deficient mice, recombination activating gene 2-deficient (RAG2–KO) mice and RAG2–KO mice that had been reconstituted with CD4+ or CD8+ T cells isolated from WT mice were treated with zymosan similarly. Mice were killed, the severity of pancreatitis was graded histologically, and serum cytokine levels were measured.
Results
Repeated administration of zymosan induced pancreatitis dose dependently in both WT and IL-10–KO mice. Administration of LTA induced pancreatitis only in IL-10–KO mice. Adoptive transfer of splenocytes obtained from IL-10–KO mice with pancreatitis did not cause pancreatitis in recipient RAG2–KO mice. Pancreatitis was scarcely observed in RAG2–KO mice and was attenuated in T-cell-deficient and B-cell-deficient mice compared with WT mice. A single administration of zymosan significantly increased the serum level of monocyte chemoattractant protein 1 (MCP-1) in WT mice.
Conclusions
Repeated stimulation of TLR2 and dectin-1 induced nonautoimmune-mediated pancreatitis in mice. Participation of acquired immunity seems to play an important role in the pathogenesis of pancreatitis in association with the increase in serum MCP-1 level.