Murgai P, Sharma P, Sachdeva MUS, Bose PL, Gupta M, Das R, Varma N. A flow cytometric cell-cycle assay using methyl green.
Anal Biochem 2020;
601:113782. [PMID:
32450059 DOI:
10.1016/j.ab.2020.113782]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 05/03/2020] [Accepted: 05/19/2020] [Indexed: 01/30/2023]
Abstract
Methyl green (MG), a conventional, low-cost histological stain, was used to design a flow cytometric cell-cycle/DNA-ploidy assay. On fluorometry, MG absorbed maximally at 633-nm, showed negligible fluorescence in free-state, but emitted brightly when bound to DNA. Optimal dye and cell concentrations for staining and effects of time and photobleaching on stained cells were determined for a lyse-permeabilize-stain protocol. Linearity of DNA-binding, coefficients-of-variation of G0/G1-peaks and minimal carryover were confirmed. Assay results correlated highly with a propidium iodide-based kit in 29 acute lymphoblastic leukemia specimens. The MG-based DNA-ploidy assay represented an accurate and inexpensive alternative to conventional PI-based assays.
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