Cited by 48Occupational and environmental lung diseasesIntraperitoneal and Appendiceal MalignanciesCancer Cells and Metastasis

Analysis of Gene Expression in 3D Spheroids Highlights a Survival Role for ASS1 in Mesothelioma

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Barbone, Dario, Van Dam, Loes, Follo, Carlo, Jithesh, Puthen V., Zhang, Shu-Dong, Richards, William G., Bueno, Raphael, Fennell, Dean A. +1 more·2016·PLOS ONE

Abstract

To investigate the underlying causes of chemoresistance in malignant pleural mesothelioma, we have studied mesothelioma cell lines as 3D spheroids, which acquire increased chemoresistance compared to 2D monolayers. We asked whether the gene expression of 3D spheroids would reveal mechanisms of resistance. To address this, we measured gene expression of three mesothelioma cell lines, M28, REN and VAMT, grown as 2D monolayers and 3D spheroids. A total of 209 genes were differentially expressed in common by the three cell lines in 3D (138 upregulated and 71 downregulated), although a clear resistance pathway was not apparent. We then compared the list of 3D genes with two publicly available datasets of gene expression of 56 pleural mesotheliomas compared to normal tissues. Interestingly, only three genes were increased in both 3D spheroids and human tumors: argininosuccinate synthase 1 (ASS1), annexin A4 (ANXA4) and major vault protein (MVP); of these, ASS1 was the only consistently upregulated of the three genes by qRT-PCR. To measure ASS1 protein expression, we stained 2 sets of tissue microarrays (TMA): one with 88 pleural mesothelioma samples and the other with additional 88 pleural mesotheliomas paired with matched normal tissues. Of the 176 tumors represented on the two TMAs, ASS1 was expressed in 87 (50%; staining greater than 1 up to 3+). For the paired samples, ASS1 expression in mesothelioma was significantly greater than in the normal tissues. Reduction of ASS1 expression by siRNA significantly sensitized mesothelioma spheroids to the pro-apoptotic effects of bortezomib and of cisplatin plus pemetrexed. Although mesothelioma is considered by many to be an ASS1-deficient tumor, our results show that ASS1 is elevated at the mRNA and protein levels in mesothelioma 3D spheroids and in human pleural mesotheliomas. We also have uncovered a survival role for ASS1, which may be amenable to targeting to undermine mesothelioma multicellular resistance.

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  • Gene expression patterns in spheroids more closely resemble those found in solid tumors than in monolayer cultures.

    “gene expression patterns in spheroids more closely resemble those found in solid tumors than in monolayer cultures [112,193,194].”

    From Modeling Tumor Microenvironment Complexity In Vitro: Spheroids as Physiologically Relevant Tumor Models and Strategies for Their Analysis (2025) · cites this paper as [193]

    The Results section (“ASS1, ANXA4 and MVP are elevated in both 3D spheroids and patients”; page not available) reports three genes elevated in both mesothelioma spheroids relative to monolayers and patient tumors relative to normal tissue. It does not establish that spheroids’ overall gene-expression patterns resemble solid tumors more closely than monolayer patterns do. (LLM, conf=0.84)

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Authors
Barbone, D., Van Dam, L., Follo, C., Jithesh, P. V., Zhang, S.-D., Richards, W. G., Bueno, R., Fennell, D. A., & Broaddus, V. C.
Affiliations
  • San Francisco General Hospital (US)
  • Sidra Medical and Research Center (QA)
  • Brigham and Women's Hospital (US)
  • University of Leicester (GB)
Corresponding author
Barbone, Dario
Venue
PLOS ONE
Published
2016-03-16
Volume
11
Issue
3
Pages
e0150044
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2313014613
Cited by
48
References
48
Citations by year
2026: 3 · 2025: 4 · 2024: 1 · 2023: 4 · 2022: 6 · 2021: 13 · 2020: 4 · 2019: 6 · 2018: 2 · 2017: 4 · 2016: 1
FWCI
3.88
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • Figshare (submittedVersion, cc-by)
  • Leicester Research Archive (University of Leicester) (submittedVersion, cc-by)
  • Ulster University Research Portal (Ulster University) (submittedVersion, other-oa)
Funders
  • Mesothelioma Applied Research Foundation
  • Centre National de la Recherche Scientifique
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Occupational and environmental lung diseases
  • Health Sciences › Medicine › Surgery › Intraperitoneal and Appendiceal Malignancies
  • Health Sciences › Medicine › Oncology › Cancer Cells and Metastasis
Keywords
malignant pleural mesothelioma, ASS1, chemoresistance, multicellular spheroids, gene expression profiling, cell survival, bortezomib, cisplatin, pemetrexed, siRNA knockdown, annexin A4, major vault protein, tumor microenvironment
MeSH terms
Major Vault Protein, Argininosuccinate Synthase, Cell Survival, Humans, Mesothelioma, Gene Expression Regulation, Enzymologic, Gene Expression Regulation, Neoplastic, Annexin A4, Spheroids, Cellular, Vault Ribonucleoprotein Particles, Cell Line, Tumor

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