A flow-cytometric method for the separation and quantitation of normal and apoptotic thymocytes

Using flow cytometry, we describe a method for separating and quantifying normal and apoptotic thymocytes. Apoptosis was induced in isolated thymocytes from immature rats by treatment with the glucocorticoid dexamethasone or the antitumor agent etoposide. Subsequent incubation with the vital bisbenz...

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Vydáno v:Analytical biochemistry Ročník 204; číslo 2; s. 351
Hlavní autoři: Sun, X M, Snowden, R T, Skilleter, D N, Dinsdale, D, Ormerod, M G, Cohen, G M
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 01.08.1992
Témata:
Animals
Apoptosis - drug effects
Benzimidazoles
Cell Separation - methods
Dexamethasone - pharmacology
DNA Damage
Etoposide - pharmacology
Flow Cytometry - methods
Microscopy, Electron
Rats
Thymus Gland - cytology
Thymus Gland - drug effects
ISSN:0003-2697
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Shrnutí:Using flow cytometry, we describe a method for separating and quantifying normal and apoptotic thymocytes. Apoptosis was induced in isolated thymocytes from immature rats by treatment with the glucocorticoid dexamethasone or the antitumor agent etoposide. Subsequent incubation with the vital bisbenzimidazole dye Hoechst 33342 and the DNA intercalating agent propidium iodide enabled three distinct populations of cells to be identified and sorted by flow cytometry. Dead cells fluoresced red due to propidium iodide whereas normal and apoptotic cells fluoresced blue due to Hoechst 33342. Apoptotic cells were distinguished from normal thymocytes both by their higher intensity of blue fluorescence and by their smaller size as determined by a reduction in forward light scatter. The larger cells, with low blue fluorescence, showed normal thymocyte morphology by electron microscopy and the absence of any DNA fragmentation as measured by agarose gel electrophoresis. In contrast, the smaller cells showed both the morphological characteristics of apoptosis and extensive internucleosomal fragmentation of DNA to multiples of approximately 180 bp. Using this method, a time-dependent induction of apoptosis by dexamethasone, which was inhibited by cycloheximide, actinomycin D, and aurin tricarboxylate, was observed. The method should facilitate mechanistic studies on the induction of apoptosis in thymocytes.
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ISSN:0003-2697
DOI:10.1016/0003-2697(92)90251-2