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Progress in understanding autoimmune exocrinopathy using the non-obese diabetic mouse: an update
S Cha1, A B Peck, M G Humphreys-Beher
1Department of Oral Biology, Immunology & Laboratory Medicine, University of Florida, Gainesville, FL 32610, USA. scha@dental.ufl.edu
Summary
Sjögren's Syndrome (SS) is a chronic autoimmune disease. The non-obese diabetic (NOD) mouse model reveals a two-phase pathogenesis involving cell dedifferentiation and autoaggression, offering insights into potential therapies.
Area of Science:
- Immunology
- Autoimmune Diseases
- Pathophysiology
Background:
- Sjögren's Syndrome (SS) is a chronic autoimmune condition affecting salivary and lacrimal glands, leading to dry eyes and mouth.
- The exact cause of SS remains unknown despite extensive research.
- Animal models are crucial for studying SS etiology, with the non-obese diabetic (NOD) mouse showing promise due to similarities with human disease.
Purpose of the Study:
- To investigate the pathophysiology of Sjögren's Syndrome using the NOD mouse model.
- To explore the roles of genetic factors, cytokines, and autoantibodies in SS development.
- To identify potential therapeutic targets for SS.
Main Methods:
- Utilized the NOD mouse model and its congenic strains for studying SS pathogenesis.
- Examined histological and functional alterations in exocrine glands.
- Investigated the roles of genetic intervals, cytokines (Th1 and Th2), and autoantibodies.
- Correlated autoantibody presence with the muscarinic(3) receptor and secretory dysfunction.
Main Results:
- The NOD mouse model exhibits biochemical and immunological similarities to human SS, including secretory dysfunction.
- SS pathogenesis in NOD mice occurs in two phases: an asymptomatic phase with epithelial cell dedifferentiation and apoptosis, followed by an autoimmune phase.
- Autoantibodies targeting the muscarinic(3) receptor are present in both SS patients and NOD mice, correlating with secretory dysfunction.
- Both Th1/Th2 cytokines and non-immune genetic loci contribute to SS progression in the NOD model.
Conclusions:
- The NOD mouse is a valuable model for unraveling SS pathophysiology.
- SS development involves distinct asymptomatic and autoimmune phases.
- Understanding the roles of genetic factors, cytokines, and autoantibodies can lead to novel therapeutic strategies for Sjögren's Syndrome.