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Updated: Oct 16, 2025
Generation and Expansion of Primary, Malignant Pleural Mesothelioma Tumor Lines
Published on: April 21, 2022
Three newly established immortalized mesothelial cell lines exhibit morphological phenotypes corresponding to
Tatsuhiro Sato1, Hayao Nakanishi2, Ken Akao1
1Division of Cancer Biology, Aichi Cancer Center Research Institute, 1-1 Kanokoden, Chikusa-ku, Nagoya, Aichi, 464-8681, Japan.
Background:
Malignant mesothelioma (MM) is a very aggressive tumor that develops from mesothelial cells, mainly due to asbestos exposure. MM is categorized into three major histological subtypes: epithelioid, sarcomatoid, and biphasic, with the biphasic subtype containing both epithelioid and sarcomatoid components. Patients with sarcomatoid mesothelioma usually show a poorer prognosis than those with epithelioid mesothelioma, but it is not clear how these morphological phenotypes are determined or changed during the oncogenic transformation of mesothelial cells.
Methods:
We introduced the E6 and E7 genes of human papillomavirus type 16 and human telomerase reverse transcriptase gene in human peritoneal mesothelial cells and established three morphologically different types of immortalized mesothelial cell lines.
Results:
HOMC-B1 cells exhibited epithelioid morphology, HOMC-A4 cells were fibroblast-like, spindle-shaped, and HOMC-D4 cells had an intermediate morphology, indicating that these three cell lines closely mimicked the histological subtypes of MM. Gene expression profiling revealed increased expression of NOD-like receptor signaling-related genes in HOMC-A4 cells. Notably, the combination treatment of HOMC-D4 cells with TGF-β and IL-1β induced a morphological change from intermediate to sarcomatoid morphology.
Conclusions:
Our established cell lines are useful for elucidating the fundamental mechanisms of mesothelial cell transformation and mesothelial-to-mesenchymal transition.
Insights
Researchers created three new cell lines that mimic malignant mesothelioma (MM) subtypes. These models help study how mesothelial cells transform and change during cancer development, aiding in understanding MM progression.
Area of Science:
- Oncology
- Cell Biology
- Cancer Research
Background:
- Malignant mesothelioma (MM) is an aggressive cancer originating from mesothelial cells, often linked to asbestos exposure.
- MM presents in epithelioid, sarcomatoid, and biphasic histological subtypes, with sarcomatoid types generally having a worse prognosis.
- The mechanisms driving MM histological phenotypes and cell transformation remain unclear.
Purpose of the Study:
- To establish novel cell line models representing different MM histological subtypes.
- To investigate the cellular and molecular changes during mesothelial cell oncogenic transformation.
- To explore the potential for mesothelial-to-mesenchymal transition (MMT).
Main Methods:
- Introduction of human papillomavirus (HPV) 16 E6/E7 and human telomerase reverse transcriptase (hTERT) genes into human peritoneal mesothelial cells.
- Establishment and morphological characterization of three distinct immortalized cell lines (HOMC-B1, HOMC-A4, HOMC-D4).
- Gene expression profiling and induction of morphological changes using TGF-β and IL-1β.
Main Results:
- Three cell lines recapitulated epithelioid (HOMC-B1), fibroblast-like/spindle (HOMC-A4), and intermediate (HOMC-D4) MM morphologies.
- HOMC-A4 cells showed elevated expression of NOD-like receptor signaling pathway genes.
- Combination treatment of HOMC-D4 cells with TGF-β and IL-1β induced a shift towards sarcomatoid morphology.
Conclusions:
- The established cell lines serve as valuable tools for studying MM pathogenesis.
- These models facilitate research into the fundamental mechanisms of mesothelial cell transformation.
- The findings provide insights into the processes underlying mesothelial-to-mesenchymal transition.
