MicroRNAs in pulmonary sarcoidosis: A systematic review

Area of Science:

• Pulmonary Medicine
• Molecular Biology
• Biomarker Discovery

Background:

• Sarcoidosis is a multisystemic granulomatous disease with unknown causes, often challenging to diagnose due to overlapping symptoms with other conditions.
• Accurate diagnosis is critical, especially differentiating from tuberculosis in endemic areas before initiating immunosuppressive therapy.
• MicroRNAs (miRNAs), small non-coding RNAs regulating gene expression, are emerging biomarkers in various respiratory diseases.

Purpose of the Study:

• To systematically review current knowledge on microRNAs in sarcoidosis.
• To explore the biological roles of miRNAs in sarcoidosis pathogenesis, including T-helper 1 and macrophage polarization.
• To assess the potential of exhaled breath condensate as a noninvasive source for miRNA detection in sarcoidosis.

Main Methods:

• A comprehensive literature search of the PubMed database was conducted by two independent reviewers.
• Relevant studies on microRNAs in sarcoidosis, its mechanisms, and potential biomarkers were retrieved and analyzed.
• Systematic review methodology was applied to synthesize the findings.

Main Results:

• MicroRNA expression profiles have been investigated in various biological samples from sarcoidosis patients, including lungs, lymph nodes, bronchoalveolar lavage fluid, and peripheral blood mononuclear cells.
• Specific miRNA signatures are being identified that may aid in sarcoidosis diagnosis and prognosis.
• Exhaled breath condensate presents a promising, noninvasive source for miRNA analysis in sarcoidosis.

Conclusions:

• MicroRNAs represent a significant area of research for improving sarcoidosis diagnosis and understanding its underlying biological mechanisms.
• Further validation of miRNA biomarkers is needed for clinical application.
• Noninvasive methods like analyzing miRNAs in exhaled breath condensate could revolutionize sarcoidosis diagnostics.