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Development of the CK‐MB‐1 trastuzumab‐resistant HER2‐positive breast cancer cell line and xenograft animal models
- Source :
- Cancer Medicine, Cancer Medicine, Vol 10, Iss 7, Pp 2370-2379 (2021)
- Publication Year :
- 2021
- Publisher :
- Wiley, 2021.
-
Abstract
- Background Patients with human epidermal growth factor receptor 2 (HER2)‐positive breast cancer who fail to respond to anti‐HER2 treatments have poor prognoses. Most trastuzumab‐resistant breast cancer cell lines available from biobanks feature either phosphoinositide‐3‐kinase, catalytic, alpha (PIK3CA) mutation or the loss of phosphatase and tensin homolog (PTEN). However, PIK3CA mutations and/or PTEN loss do not account for most trastuzumab‐resistant tumors in humans. Methods Breast cancer cells were collected from one patient's malignant ascites. These cells were cultured and maintained to develop a stable cell line, which we named CK‐MB‐1. We used western blotting to evaluate protein expression. The PIK3CA status of CK‐MB‐1 cells was analyzed using Sanger sequencing and validated using next‐generation sequencing. In vivo, CK‐MB‐1 xenograft tumor models were developed in zebrafish and immunodeficient mice. Results CK‐MB‐1 cells maintained the major characteristics of the parental tumor including HER2 positivity and estrogen receptor negativity. The HER2 gene amplification of CK‐MB‐1 cells was detected by fluorescence in situ hybridization. The integrity of PTEN was confirmed by its positive protein expression and the absence of gene mutations. No common PIK3CA mutation was detected. Compared with the findings in two other HER2‐positive trastuzumab‐resistant cell lines, CK‐MB‐1 cells exhibited greater resistance to trastuzumab, chemotherapeutics, and small‐molecule drugs. Trastuzumab resistance in CK‐MB‐1 cells was confirmed in vivo using the NOD SCID mouse model. Conclusions CK‐MB‐1 cells represent a stable HER2‐positive trastuzumab‐resistant breast cancer cell line. The resistance of CK‐MB‐1 cells does not originate from the PTEN or phosphoinositide 3‐kinase signaling pathway, which can provide an alternative approach for potential drugs.<br />Compared with the findings in two other HER2‐positive cell lines, CK‐MB‐1 cells exhibited greater resistance to trastuzumab, chemotherapeutics, and small‐molecule drugs, and the resistance of the cells to trastuzumab was confirmed in zebrafish and mouse models. Because the resistance of the cell line to trastuzumab is not associated with alterations in PI3K or PTEN signaling, these cells should be useful for developing novel treatments for drug‐resistant breast cancer.
- Subjects :
- 0301 basic medicine
Cancer Research
Receptor, ErbB-2
Estrogen receptor
Mice, SCID
cell lines
Gene mutation
Mice
Antineoplastic Agents, Immunological
0302 clinical medicine
Mice, Inbred NOD
Trastuzumab
Tensin
skin and connective tissue diseases
In Situ Hybridization, Fluorescence
Zebrafish
Original Research
medicine.diagnostic_test
Ascites
High-Throughput Nucleotide Sequencing
lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens
animal models
Receptors, Estrogen
Oncology
030220 oncology & carcinogenesis
Disease Progression
MCF-7 Cells
Female
medicine.drug
Adult
Class I Phosphatidylinositol 3-Kinases
Blotting, Western
Breast Neoplasms
Biology
lcsh:RC254-282
03 medical and health sciences
breast cancer
Breast cancer
Cell Line, Tumor
medicine
Animals
Humans
PTEN
Radiology, Nuclear Medicine and imaging
xenograft
neoplasms
PTEN Phosphohydrolase
Clinical Cancer Research
medicine.disease
Xenograft Model Antitumor Assays
030104 developmental biology
Drug Resistance, Neoplasm
Cell culture
Mutation
Cancer research
biology.protein
Fluorescence in situ hybridization
Subjects
Details
- ISSN :
- 20457634
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Cancer Medicine
- Accession number :
- edsair.doi.dedup.....aeefc38d40f36b339825983df8db4ae2