title: Detection of viable and non-viable cells in connective tissue explants using the fixable fluoroprobes 5-chloromethylfluorescein diacetate and ethidium homodimer-1.
abstract: The efficacy of connective tissue explants is difficult to determine, particularly where autopsy material is required for research or clinical applications. We report here an optimised protocol using 5-chloromethylfluorescein diacetate (CMFDA) and ethidium homodimer-1 to distinguish viable and non-viable cells in a range of connective tissue explants. Biopsies and explants of corneae, arteries, cartilage and skin were loaded with fluoroprobes for extended periods (< or = 24h) at low temperatures (4 degrees C), fixed in paraformaldehyde, and processed using a variety of embedding, sectioning, autoradiographic, and immunohistochemical procedures. Detection of fluorescent green CMFDA and red ethidium homodimer was achieved using epi-illuminated light or dual channel confocal microscopy, and clearly differentiated live from dead cells throughout the explants. Furthermore, the intracellular distribution of CMFDA provided superior images of cell shape and morphology not previously available using conventional histochemical techniques. Adaptations of this protocol could prove valuable in a variety of research and clinical applications.
authors.affiliation: Department of Anatomy, University of Auckland, New Zealand.
authors.forename: C A
authors.initials: CA
authors.lastname: Poole
authors.forename: N H
authors.initials: NH
authors.lastname: Brookes
authors.forename: R T
authors.initials: RT
authors.lastname: Gilbert
authors.forename: B W
authors.initials: BW
authors.lastname: Beaumont
authors.forename: A
authors.initials: A
authors.lastname: Crowther
authors.forename: L
authors.initials: L
authors.lastname: Scott
authors.forename: M J
authors.initials: MJ
authors.lastname: Merrilees
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D002358:Cartilage, Articular / Q000166:cytology; D002417:Cattle; D002470:Cell Survival / Q000502:physiology*; D002648:Child; D003239:Connective Tissue Cells; D003315:Cornea / Q000166:cytology; D003331:Coronary Vessels / Q000166:cytology; D004996:Ethidium / Q000031:analogs & derivatives* / Q000378:metabolism; D005260:Female; D005452:Fluoresceins / Q000378:metabolism*; D005456:Fluorescent Dyes / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012867:Skin / Q000166:cytology; D013194:Staining and Labeling; D013552:Swine; D013895:Thoracic Arteries / Q000166:cytology
chemical_list: D005452:Fluoresceins; D005456:Fluorescent Dyes; C069306:5-chloromethylfluorescein; C018533:ethidium homodimer; D004996:Ethidium