Establishment of an experimental model of canine malignant mesothelioma organoid culture using a three-dimensional culture method

Biomedicine and Pharmacotherapy 2023 June [Link]

Yomogi Sato, Mohamed Elbadawy, Kazuhiko Suzuki, Ryouichi Tsunedomi, Hiroaki Nagano, Yusuke Ishihara, Haru Yamamoto, Daigo Azakami, Tsuyoshi Uchide, Rina Nabeta, Ryuji Fukushima, Amira Abugomaa, Masahiro Kaneda, Hideyuki Yamawaki 10, Yuta Shinohara, Tatsuya Usui, Kazuaki Sasaki


Canine malignant mesothelioma (cMM) is a rare and drug-resistant malignant tumor. Due to few patients and experimental models, there have not been enough studies to demonstrate the pathogenesis of the disease and novel effective treatment for cMM. Since cMM resembles human MM (hMM) in histopathological characteristics, it is also considered a promising research model of hMM. Compared with conventional 2-dimensional (2D) culture methods, 3-dimensional (3D) organoid culture can recapitulate the properties of original tumor tissues. However, cMM organoids have never been developed. In the present study, we for the first time generated cMM organoids using the pleural effusion samples. Organoids from individual MM dogs were successfully generated. They exhibited the characteristics of MM and expressed mesothelial cell markers, such as WT-1 and mesothelin. The sensitivity to anti-cancer drugs was different in each strain of cMM organoids. RNA sequencing analysis showed cell adhesion molecule pathways were specifically upregulated in cMM organoids compared with their corresponding 2D cultured cells. Among these genes, the expression level of E-cadherin was drastically higher in the organoids than that in the 2D cells. In conclusion, our established cMM organoids might become a new experimental tool to provide new insights into canine and human MM therapy.