title: Sequential quantification of AgNOR area and number during silver staining by means of an image analysing system.
abstract: Standardized AgNOR staining protocols are required to compare results obtained by means of image analysis systems (IAS) in different laboratories. In order to investigate the staining kinetics of the NOR silver staining, we evaluated automatically the area and number of AgNORs of a human transitional-cell carcinoma cell line (HOK-1) by IAS at one minute intervals over a total staining period of 30 minutes. Results showed a constant increase (standard error of estimate: 0.001; R squared: 0.8) of the AgNOR area reaching a plateau after 10 minutes followed by further area increase. In contrast, in all experiments a pronounced variability in the AgNOR number (standard error of estimate: 0.042; R squared: 0.75) was noted, reflecting the aggregation of silver stained spots. Thus the evaluation of the AgNOR area yielded reliable and easily reproducible results, whereas the assessment of the AgNOR number by means of an automated IAS was associated with a marked variability.
authors.affiliation: Department of Surgery I, University of Innsbruck, Austria.
authors.forename: D
authors.initials: D
authors.lastname: Ofner
authors.forename: A
authors.initials: A
authors.lastname: Hittmair
authors.forename: H
authors.initials: H
authors.lastname: Maier
authors.forename: B
authors.initials: B
authors.lastname: Riedmann
authors.forename: A
authors.initials: A
authors.lastname: Rumer
authors.forename: P
authors.initials: P
authors.lastname: Lucciarini
authors.forename: F
authors.initials: F
authors.lastname: Offner
authors.forename: G
authors.initials: G
authors.lastname: Mikuz
authors.forename: K W
authors.initials: KW
authors.lastname: Schmid
mesh_terms: D001322:Autoanalysis / Q000379:methods; D002295:Carcinoma, Transitional Cell / Q000473:pathology*; D002460:Cell Line; D002467:Cell Nucleus / Q000473:pathology / Q000648:ultrastructure; D006801:Humans; D009697:Nucleolus Organizer Region / Q000473:pathology* / Q000648:ultrastructure; D012834:Silver; D013194:Staining and Labeling; D014407:Tumor Cells, Cultured
chemical_list: D012834:Silver