Intravital fluorescence microscopy: impact of light-induced phototoxicity on adhesion of fluorescently labeled leukocytes.

Détails

ID Serval
serval:BIB_F24DF814B112
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Intravital fluorescence microscopy: impact of light-induced phototoxicity on adhesion of fluorescently labeled leukocytes.
Périodique
Journal of Histochemistry and Cytochemistry
Auteur(s)
Saetzler R.K., Jallo J., Lehr H.A., Philips C.M., Vasthare U., Arfors K.E., Tuma R.F.
ISSN
0022-1554 (Print)
ISSN-L
0022-1554
Statut éditorial
Publié
Date de publication
1997
Volume
45
Numéro
4
Pages
505-513
Langue
anglais
Résumé
Alterations in leukocyte/endothelium interaction due to phototoxic effects of the fluorescent dyes acridine orange (AO) and rhodamine 6G (Rh6G) were studied by intravital microscopy using the dorsal skinfold model in awake Syrian golden hamsters. AO (0.5 mg/kg/min; constant IV infusion) and Rh6G (0.1 micromol/kg; bolus IV) were administered via an indwelling venous catheter. Five to seven arterioles (35-55 microm) and postcapillary venules (30-65 microm) were investigated in each animal. Vessels were exposed four times for 30 sec to continuous light of the appropriate excitation wavelength with a 10-15-min time interval between exposures. Animals were randomly assigned to five experimental groups (five distinct light energy levels). AO and Rh6G induced leukocyte rolling/sticking in postcapillary venules and arterioles when exposed to high light energy levels. AO, but not Rh6G, induced arteriolar vasospasm when exposed to high light energies. The potential phototoxic effect of AO and Rh6G is demonstrated, as assessed by the stimulation of leukocyte-endothelium interaction and arteriolar vasospasm in vivo. This study underscores the necessity to optimize microscopic set-ups for intravital microscopy, to reduce the excitation light energy level significantly, and to perform stringent control experiments, ruling out an artificial phototoxicity-induced stimulation of leukocyte adhesion.
Mots-clé
Acridine Orange/pharmacology, Animals, Arterioles/cytology, Arterioles/drug effects, Cell Adhesion/radiation effects, Cricetinae, Endothelium, Vascular/cytology, Endothelium, Vascular/drug effects, Female, Fluorescent Dyes, Leukocytes/cytology, Leukocytes/radiation effects, Light, Mesocricetus, Microscopy, Fluorescence, Rhodamines/pharmacology, Vasoconstriction/drug effects
Pubmed
Création de la notice
25/11/2011 20:34
Dernière modification de la notice
03/03/2018 22:40
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