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Capillary leakage in inflammation. A study by vascular labeling
I Joris1, H F Cuénoud, G V Doern
1Department of Pathology, University of Massachusetts Medical School, Worcester 01655.
The American Journal of Pathology
|December 1, 1990
Summary
Dying tissue fragments trigger a biphasic vascular leakage response, initially affecting venules and later capillaries. This capillary leakage is driven by the inflammatory reaction, potentially involving angiogenesis.
Area of Science:
- Vascular biology
- Inflammation research
- Tissue injury models
Background:
- Local injection of inflammatory mediators causes venular leakage.
- Understanding endogenous mediators from dying tissue on vascular leakage is crucial.
Purpose of the Study:
- To investigate the effect of endogenous mediators from necrotic tissue on vascular leakage.
- To simulate an infarct model exposing living vessels to aseptic necrosis fragments.
Main Methods:
- Implanted aseptically necrotic rat tissues into cremasteric sacs of control rats.
- Used boiled tissues and inert materials (Teflon, glass) as controls.
- Injected carbon black intravenously at various time points and analyzed cremaster mounts and histology.
Main Results:
- Vascular labeling was venular up to 8 hours, transitioning to capillary labeling by 48 hours.
- Histology revealed acute inflammatory infiltrates in labeled areas.
- A weaker, similar pattern was observed in controls, indicating a biphasic leakage response.
Conclusions:
- Vascular leakage in aseptic inflammation is biphasic: venular followed by capillary.
- The capillary phase is induced by the inflammatory reaction, possibly via angiogenesis.