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Antifibrinolytic activity in middle ear effusion
Abstract:
No activity of the plasmin and plasminogen activators could be detected in middle ear effusion (MEE). A streptokinase proactivator, which was not plasminogen and markedly enhanced the activation of plasminogen by streptokinase, could be detected. MEE had an apparent inhibitory activity against both thiol protease (papain) and serine proteases (plasmin and trypsin). All these findings indicate that MEE contains unsaturated protease inhibitors and is in a state of predominance of inhibitors over fibrinolytic activity.
Insights
Middle ear effusion (MEE) lacks plasmin activity but contains a streptokinase proactivator. This fluid exhibits protease inhibition, indicating inhibitors dominate over fibrinolytic activity in the middle ear.
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.