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Related Experiment Videos

Plasminogen activator in human tears.

J D Stevens1, J M Marshall, L Benjamin

  • 1Department of Ophthalmology, University of Oxford, UK.

Eye (London, England)
|January 1, 1992
PubMed
Summary
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Human tears contain tissue plasminogen activator (t-PA), but not urokinase plasminogen activator (u-PA). Inflammation from cataract surgery affects t-PA levels, with steroids reducing this effect.

Area of Science:

  • Ophthalmology
  • Biochemistry
  • Inflammation research

Background:

  • Plasminogen activators (PAs) are crucial for fibrinolysis.
  • Tissue plasminogen activator (t-PA) and urokinase plasminogen activator (u-PA) are the main PAs.
  • Tear film composition can be altered by ocular surface conditions and inflammation.

Purpose of the Study:

  • To investigate the presence and levels of PAs in human tears.
  • To examine the impact of cataract surgery-induced inflammation on tear PA levels.
  • To assess the effect of subconjunctival corticosteroids on tear t-PA.

Main Methods:

  • Human tear samples were collected from patients undergoing cataract surgery.
  • Levels of t-PA and u-PA in tears were measured.

Related Experiment Videos

  • Tear samples were analyzed pre-operatively and post-operatively.
  • The influence of per-operative subconjunctival betamethasone was evaluated.

    • Main Results:

    • Tissue plasminogen activator (t-PA) was detected in human tears, while urokinase plasminogen activator (u-PA) was not.
    • Significant variability in pre-operative t-PA levels was observed.
    • Post-operative levels of t-PA increased significantly in patients not treated with betamethasone.
    • Conversely, a significant decrease in t-PA levels was noted in patients who received betamethasone.

    Conclusions:

    • Human tears contain t-PA, suggesting a role in ocular surface homeostasis or response to injury.
    • Cataract surgery induces an inflammatory response that elevates tear t-PA levels.
    • Subconjunctival betamethasone effectively suppresses the rise of t-PA in tears following cataract surgery, indicating an anti-inflammatory effect on this pathway.