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Ultrasonographic Evaluation of Salivary Glands for Sjogren's Syndrome: Diagnostic and Monitoring Insights
Published on: October 13, 2023
Pathogenesis of Sjögren's syndrome and therapeutic consequences
Xavier Mariette1, Jacques-Eric Gottenberg
1Hôpital Bicêtre, Assistance Publique-Hôpitaux de Paris, Université Paris-Sud 11, Institut Pour la Santé et la Recherche Médicale U1012, Le Kremlin Bicêtre, France. xavier.mariette@bct.aphp.fr
Purpose Of Review:
To summarize recent findings on new pathogenic mechanisms of interaction between genetic and environmental factors and between innate and adaptive immunity in primary Sjögren's syndrome and to reconcile pathogenesis and treatment by focusing on the crucial pathogenic steps that could be targeted by emerging therapies.
Recent Findings:
Regarding genetic predisposition, the functional relevance of IRF5 and STAT4 gene polymorphisms in the activation of type I interferon pathways has been demonstrated. It has also been shown that the isolated stimulation of innate immunity in mice can result in dryness, which precedes lymphocytic infiltrates in salivary glands. In animal models, possible environmental triggers of the disease, such as oestrogen deficiency and/or infection by Epstein-Barr virus, can lead to innate immune followed by autoimmune epithelitis. The IFN-BAFF-B lymphocyte pathogenic axis is, therefore, targeted by numerous drugs currently in evaluation. The development of consensus disease activity scores and patient-related outcomes might help to initiate new controlled trials. The first positive randomized controlled trial with rituximab has been recently published.
Summary:
Hopefully, persistent and joint efforts by many teams to improve the knowledge on the pathogenesis of the disease may allow identification of new therapeutic targets in Sjögren's syndrome.
Insights
Recent findings reveal genetic and environmental factors interacting with innate and adaptive immunity in primary Sjögren
Area of Science:
- Immunology
- Genetics
- Rheumatology
Background:
- Primary Sjögren's syndrome involves complex interactions between genetic and environmental factors.
- Both innate and adaptive immune system dysregulation contribute to disease pathogenesis.
Purpose of the Study:
- To review recent discoveries in the pathogenic mechanisms of primary Sjögren's syndrome.
- To connect disease pathogenesis with potential therapeutic targets for emerging treatments.
Main Methods:
- Review of recent findings on genetic and environmental factors in Sjögren's syndrome.
- Analysis of immune system interactions (innate and adaptive) in disease development.
- Focus on critical pathogenic steps for targeted therapy development.
Main Results:
- IRF5 and STAT4 gene polymorphisms are linked to type I interferon pathway activation.
- Innate immune stimulation in mice can induce dryness preceding lymphocytic infiltrates.
- Environmental factors like estrogen deficiency and Epstein-Barr virus infection trigger autoimmune epithelitis.
- The IFN-BAFF-B lymphocyte axis is a key target for new drugs.
- The first positive rituximab trial in Sjögren's syndrome has been reported.
Conclusions:
- Understanding Sjögren's syndrome pathogenesis is crucial for identifying new therapeutic targets.
- Continued research efforts are expected to yield novel treatment strategies.
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