| Dokumentenart: | Artikel | ||||
|---|---|---|---|---|---|
| Titel eines Journals oder einer Zeitschrift: | Langenbeck's Archives of Surgery | ||||
| Verlag: | SPRINGER-VERLAG | ||||
| Ort der Veröffentlichung: | NEW YORK | ||||
| Band: | 385 | ||||
| Nummer des Zeitschriftenheftes oder des Kapitels: | 4 | ||||
| Seitenbereich: | S. 290-298 | ||||
| Datum: | 2000 | ||||
| Institutionen: | Medizin > Lehrstuhl für Chirurgie | ||||
| Identifikationsnummer: |
| ||||
| Stichwörter / Keywords: | ISCHEMIA-REPERFUSION INJURY; PLATELET-AGGREGATION; STRIATED-MUSCLE; PHOTODYNAMIC THERAPY; CHEEK POUCH; LIGHT; DEXTRAN; DYE; MICROCIRCULATION; MICROVESSELS; ischemia/reperfusion; phototoxicity; rhodamine 6G; fluorescein isothiocyanate dextran; intravital microscopy | ||||
| Dewey-Dezimal-Klassifikation: | 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin | ||||
| Status: | Veröffentlicht | ||||
| Begutachtet: | Ja, diese Version wurde begutachtet | ||||
| An der Universität Regensburg entstanden: | Ja | ||||
| Dokumenten-ID: | 74202 |
Web of ScienceZusammenfassung
Intravital microscopy is widely used to study the microcirculation. However, the use of fluorescent dyes can induce phototoxic effects which may affect the measurements, particularly in tissue exposed to oxidative stress, The aim of the study was to determine the threshold light dose at which fluorescent microscopy is associated with phototoxic effects in the hamster dorsal skinfold chamber under ...
Zusammenfassung
Intravital microscopy is widely used to study the microcirculation. However, the use of fluorescent dyes can induce phototoxic effects which may affect the measurements, particularly in tissue exposed to oxidative stress, The aim of the study was to determine the threshold light dose at which fluorescent microscopy is associated with phototoxic effects in the hamster dorsal skinfold chamber under normal and pathological conditions. The extent of phototoxicity in the microcirculation in the hamster skinfold chamber was investigated using intravital fluorescent microscopy during 60 min of illumination (1048 mW/cm(2)) applying two different concentrations of fluorescein isothiocyanate dextran under baseline conditions (groups A and B and following 4 h of ischemia (groups C and D). In the second part of the study the microvasculature was analyzed regarding phototoxic effects during a standardized intravital microscopic examination after 4 h of pressure induced ischemia. Groups I and II (n=7) were studied using epiillumination after injection of fluorescein isothiocyanate dextran plus rhodamine 6G or rhodamine 6G only. In group LII (n=7) only transillumination was used. Arteriolar vasospasm, microvascular perfusion failure, thrombus formation, and enhanced leukocyte endothelium interaction were observed as signs of a phototoxic effect in normal tissue. However, the light doses needed to induce these effects clearly exceeded those during standard examinations. The induction of a 4-h ischemia and reperfusion further enhanced these effects. Despite the predamage by ischemia/reperfusion the comparison of epiillumination and transillumination microscopy using a standard protocol showed no differences regarding the parameters analyzed at any time. This indicates that epiillumination and the fluorescent dyes per se did not affect the experimental results. These results show that ischemia/reperfusion studies in the dorsal skinfold chamber of the Syrian golden hamster can be carried out safely without the risk of inducing phototoxic effects by fluorescent microscopy. Nevertheless every laboratory using epiillumination and fluorescent dyes should take precautions to avoid these effects by the use of sensitive cameras to lower the light dose.
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