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

Details

Serval ID
serval:BIB_F24DF814B112
Type
Article: article from journal or magazin.
Collection
Publications
Title
Intravital fluorescence microscopy: impact of light-induced phototoxicity on adhesion of fluorescently labeled leukocytes.
Journal
Journal of Histochemistry and Cytochemistry
Author(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
Publication state
Published
Issued date
1997
Volume
45
Number
4
Pages
505-513
Language
english
Abstract
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.
Keywords
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
Create date
25/11/2011 19:34
Last modification date
20/08/2019 16:19
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