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Updated: Apr 8, 2026
Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms
Published on: December 9, 2015
[Methodology of Establishing and Identifying NCI-H2228/Crizotinib-resistant Cell Lines In Vitro]
Di Wu1, Guihua Jin2, Dawei Zhao3
1Tumor Center, No.1 Hospital of Jilin University, Changchun 130012, China.
Background And Objective:
The mechanisms of small molecule targeting drug resistance and ways to overcome resistance are now both urgent need to improve the clinical efficacy. This study aimed to investigate the feasibility of using different methods to establish the crizotinib-resistant non-small cell lung cancer NCI-H2228/Crizotinib cell lines and to clarify the mechanisms of resistance to small molecule targeting drug, thus providing experimental and theoretical bases for further studies to overcome the mechanisms of Crizotinib resistance.
Methods:
The study utilized stepwise increase of drug concentrations and chemical mutagen to induce Crizotinib-resistant NCI-H2228 cells. The drug 50% inhibitory concentration (IC50) values of parental and resistant cells and the population doubling time were determined by MTT assay. The echinoderm microtubule-associated protein-like 4-anaplastic lymphoma kinase (EML4-ALK) expression was evaluated by RT-PCR and Western blot. Full-length sequencing method was used to compare the EML4-ALK genes in the parent and drug-resistant cells and analyze the mechanisms of drug resistance.
Results:
The method of gradually increasing drug concentration to induce Crizotinib-resistant NCI-H2228 cells was time-consuming because the cell growth recovery was extremely slow. Thus, this method was considered invalid. However, chemical mutagen ENU can effectively induce NCI-H2228 cells resistant to crizotinib in a short time [IC50]= (3.810±1.100) μmol/L, P=0.002,9 vs parental cells]. Furthermore, the gene mutation frequency of EML4-ALK in the resistant cells was significantly higher than that in the parent cells.
Conclusions:
Chemical mutagen-induced cell resistance was easily operated and had effectively shortened the experimental process. Preliminary technical methods and experimental evidence for in-depth study of drug resistance mechanisms and approaches to overcome the targeted drug resistance were also provided. .
Insights
Chemical mutagens efficiently establish crizotinib-resistant non-small cell lung cancer cell lines, revealing increased echinoderm microtubule-associated protein-like 4-anaplastic lymphoma kinase gene mutations. This accelerates research into overcoming targeted drug resistance.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Drug resistance to small molecule targeted therapies is a significant clinical challenge in non-small cell lung cancer (NSCLC).
- Understanding resistance mechanisms is crucial for developing strategies to improve treatment efficacy.
Purpose of the Study:
- To evaluate methods for establishing crizotinib-resistant NSCLC NCI-H2228/Crizotinib cell lines.
- To elucidate the molecular mechanisms underlying resistance to crizotinib, a targeted therapy.
Main Methods:
- Established resistant cell lines using stepwise drug concentration increases and chemical mutagens (ENU).
- Assessed drug sensitivity (IC50) and cell proliferation via MTT assay.
- Quantified echinoderm microtubule-associated protein-like 4-anaplastic lymphoma kinase (EML4-ALK) expression using RT-PCR and Western blot, and analyzed gene mutations via full-length sequencing.
Main Results:
- Stepwise drug increase was inefficient due to slow cell recovery.
- Chemical mutagen ENU rapidly induced crizotinib resistance in NCI-H2228 cells (IC50 increased significantly).
- Resistant cells exhibited a higher frequency of EML4-ALK gene mutations compared to parental cells.
Conclusions:
- Chemical mutagen induction is an effective and time-efficient method for generating drug-resistant cell lines.
- This study provides foundational data for investigating targeted drug resistance mechanisms and developing overcoming strategies.
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