nonlinear regression (curve fit) dose-response function  (GraphPad Software Inc)

Journal: Scientific Reports

Article Title: Hyperpolarized [1- 13 C]pyruvate NMR spectroscopy reveals transition of tumor energy metabolism in microscale multicellular spheroids

doi: 10.1038/s41598-025-03454-1

Figure Lengend Snippet: IC 50 and IC 90 values (μM) of anti-tumor drugs for monolayer and spheroid-cultured cells in a 96-well format (Fig. S2 , n = 3). Each cell culture was performed at 37 °C in an atmosphere containing 5% CO 2 , and treated with various concentrations of drugs for 48 h. Cell viability was assessed using the MTS assay reagent (Promega). Data were analyzed using a nonlinear regression curve-fitting package in Prism 4 (GraphPad Software Inc.) (Fig. S2 ). The drugs tested included: docetaxel, a mitotic inhibitor; irinotecan, a topoisomerase I inhibitor; 5-fluorouracil (5-FU), a thymidylate synthase inhibitor; sunitinib, a multi-receptor tyrosine kinase (RTK) inhibitor; tirapazamine, a hypoxia-activated prodrug; and FX11, a lactate dehydrogenase inhibitor. Radial organization of each cell on the spheroidal culture dish (IWAKI) conferred resistance to the most of drugs tested.

Article Snippet: Cell viability in each drug concentration was plotted (Fig. ), and the sigmoidal dose–response curve was calculated using a nonlinear regression curve fitting package (sigmoidal dose–response) in Prism 4 (GraphPad Software Inc., La Jolla, CA).

Techniques: Cell Culture, MTS Assay, Software