K Mascotti1, J McCullough, S R Burger. 1. Department of Laboratory Medicine and Pathology, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA.
Abstract
BACKGROUND: A reliable, validated method for rapidly determining HPC viability is essential for clinical cell engineering. STUDY DESIGN AND METHODS: A fluorometric cell viability assay using acridine orange and propidium iodide (AO/PI) was compared to the current standard, trypan blue (TB) exclusion. Viable cells stained with AO/PI fluoresce green under darkfield fluorescence microscopy, while nonviable cells fluoresce orange. Mixtures of fresh and heat-killed bone marrow were prepared and used as viability standards for evaluation of both assays. The frequency of CFU-GM was determined for each specimen. RESULTS: Cell viability measured by AO/PI was extremely linear, with measured and predicted viability in agreement from 0 to 100 percent of the viable cells and a coefficient of regression (r(2)) of 0.9921. The predicted-viability regression line fell within the 95% CI for AO/PI-measured viability. The coefficient of regression for TB-measured viability was 0.9584, with the predicted-viability regression line almost entirely outside the 95% CI. TB overestimated the percentage of viable cells, particularly below the 50-percent level. CFU-GM frequency correlated better with cell viability measured by AO/PI (r(2) = 0.979) than with that measured by TB (r(2) = 0.930). CONCLUSIONS: The AO/PI viability assay is a rapid, highly linear, functionally correlated assay that is superior to conventional viability measurement by TB exclusion.
BACKGROUND: A reliable, validated method for rapidly determining HPC viability is essential for clinical cell engineering. STUDY DESIGN AND METHODS: A fluorometric cell viability assay using acridine orange and propidium iodide (AO/PI) was compared to the current standard, trypan blue (TB) exclusion. Viable cells stained with AO/PI fluoresce green under darkfield fluorescence microscopy, while nonviable cells fluoresce orange. Mixtures of fresh and heat-killed bone marrow were prepared and used as viability standards for evaluation of both assays. The frequency of CFU-GM was determined for each specimen. RESULTS: Cell viability measured by AO/PI was extremely linear, with measured and predicted viability in agreement from 0 to 100 percent of the viable cells and a coefficient of regression (r(2)) of 0.9921. The predicted-viability regression line fell within the 95% CI for AO/PI-measured viability. The coefficient of regression for TB-measured viability was 0.9584, with the predicted-viability regression line almost entirely outside the 95% CI. TB overestimated the percentage of viable cells, particularly below the 50-percent level. CFU-GM frequency correlated better with cell viability measured by AO/PI (r(2) = 0.979) than with that measured by TB (r(2) = 0.930). CONCLUSIONS: The AO/PI viability assay is a rapid, highly linear, functionally correlated assay that is superior to conventional viability measurement by TB exclusion.
Authors: M A Nakisah; M Y Ida Muryany; H Fatimah; R Nor Fadilah; M R Zalilawati; S Khamsah; M Habsah Journal: World J Microbiol Biotechnol Date: 2011-11-06 Impact factor: 3.312
Authors: Richard Mitchell; John E Wagner; Claudio G Brunstein; Qing Cao; David H McKenna; Troy C Lund; Michael R Verneris Journal: Biol Blood Marrow Transplant Date: 2014-09-28 Impact factor: 5.742