Lens-Free Imaging as a Sensor for Dynamic Cell Viability Detection Using the Neutral Red Uptake Assay
Brian J. Nablo, Jungjoon Ahn, Kiran Bhadriraju, Jong M. Lee, Darwin R. Reyes-Hernandez
Neutral red is a supravital stain that estimates the number of viable cells based on its accumulation and retention within lysosomes. The standard protocol relies on a destructive extraction process in order to spectrophotometrically quantify the amount of dye uptake. We report the quantification on live cells of neutral red uptake by HepG2 hepatic cancer cells with a lens-free imaging system utilizing two light sources. The pinhole source aids in mapping the cell perimeter, while a collimating source allows for precise measurement of light intensity. The absorbance of neutral red is quantifiable on the cellular level without additional treatment. Besides verifying cell viability, the neutral red uptake distinguishes between two distinctly different cell morphologies in confluent cultures, thus making this platform a versatile one with more functionalities within the same system.
, Ahn, J.
, Bhadriraju, K.
, Lee, J.
and Reyes-Hernandez, D.
Lens-Free Imaging as a Sensor for Dynamic Cell Viability Detection Using the Neutral Red Uptake Assay, ACS Applied Bio Materials, [online], https://doi.org/10.1021/acsabm.0c01082
(Accessed May 11, 2021)