Methotrexate Induces Apoptosis in Organ-Cultured Nasal Polyps Via the Fas Pathway

Area of Science:

• Immunology
• Cell Biology
• Pharmacology

Background:

• Methotrexate (MTX) is effective for chronic inflammatory diseases and induces apoptosis in nasal polyps (NPs).
• Fas-Fas ligand (FasL) interactions regulate immune and inflammatory cell functions.
• Understanding MTX's mechanism in NPs is crucial for treatment optimization.

Purpose of the Study:

• To identify pathways activated by Fas signaling in MTX-treated nasal polyps.
• To investigate the role of the Fas pathway in MTX-induced apoptosis in NPs.
• To explore MTX as a potential therapeutic agent for nasal polyps.

Main Methods:

• Nasal polyp tissues were cultured using an air-liquid interface organ culture method.
• Cultures were treated with MTX (10 or 100 μM) for 24 hours.
• Reverse transcription-polymerase chain reaction and Western blotting were used to analyze gene and protein expression.

Main Results:

• Fas mRNA expression remained unchanged, but FasL mRNA expression significantly increased in MTX-treated NPs.
• Both Fas and FasL protein levels were significantly elevated in polyps treated with MTX compared to controls.
• These findings indicate MTX upregulates the Fas pathway in nasal polyps.

Conclusions:

• Methotrexate induces apoptosis in nasal polyps through the Fas pathway.
• Topical application of MTX warrants further investigation for nasal polyp control.
• MTX presents a potential steroid-sparing alternative for treating nasal polyps.