Antifibrinolytic activity in middle ear effusion.

Area of Science:

• Biochemistry
• Otolaryngology
• Protease Inhibitor Research

Background:

• Middle ear effusion (MEE) is a complex fluid involved in middle ear infections.
• Understanding the biochemical composition of MEE is crucial for diagnosing and treating otitis media.

Purpose of the Study:

• To investigate the presence and activity of fibrinolytic enzymes and protease inhibitors in MEE.
• To determine the balance between proteolytic and anti-proteolytic factors in the middle ear environment.

Main Methods:

• Assays were performed to detect plasmin and plasminogen activator activity in MEE.
• The presence of a streptokinase proactivator was investigated.
• Inhibitory activity against thiol proteases (papain) and serine proteases (plasmin, trypsin) was assessed.

Main Results:

• No detectable activity of plasmin or plasminogen activators was found in MEE.
• A streptokinase proactivator, distinct from plasminogen, was identified.
• MEE demonstrated significant inhibitory activity against papain, plasmin, and trypsin.

Conclusions:

• MEE is characterized by a lack of intrinsic fibrinolytic activity.
• The fluid contains active protease inhibitors, suggesting a state where inhibitors outweigh fibrinolytic factors.
• These findings highlight the role of protease inhibitors in the middle ear's defense mechanisms.