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Tuberous Sclerosis Complex cell‐derived EVs have an altered protein cargo capable of regulating their microenvironment and have potential as disease biomarkers

Muireann Ní Bhaoighill Orcid Logo, Juan M. Falcón‐Pérez Orcid Logo, Félix Royo Orcid Logo, Andrew R. Tee Orcid Logo, Jason Webber Orcid Logo, Elaine A. Dunlop Orcid Logo

Journal of Extracellular Vesicles, Volume: 12, Issue: 6

Swansea University Author: Jason Webber Orcid Logo

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DOI (Published version): 10.1002/jev2.12336

Abstract

Hyperactivation of mechanistic target of rapamycin complex 1 (mTORC1) is a feature of many solid tumours and is a key pathogenic driver in the inherited condition Tuberous Sclerosis Complex (TSC). Modulation of the tumour microenvironment by extracellular vesicles (EVs) is known to facilitate the de...

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Published in: Journal of Extracellular Vesicles
ISSN: 2001-3078 2001-3078
Published: Wiley 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa64712
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Abstract: Hyperactivation of mechanistic target of rapamycin complex 1 (mTORC1) is a feature of many solid tumours and is a key pathogenic driver in the inherited condition Tuberous Sclerosis Complex (TSC). Modulation of the tumour microenvironment by extracellular vesicles (EVs) is known to facilitate the development of various cancers. The role of EVs in modulating the tumour microenvironment and their impact on the development of TSC tumours, however, remains unclear. This study, therefore, focuses on the poorly defined contribution of EVs to tumour growth in TSC. We characterised EVs secreted from TSC2-deficient and TSC2-expressing cells and identified a distinct protein cargo in TSC2-deficient EVs, containing an enrichment of proteins thought to be involved in tumour-supporting signalling pathways. We show EVs from TSC2-deficient cells promote cell viability, proliferation and growth factor secretion from recipient fibroblasts within the tumour microenvironment. Rapalogs (mTORC1 inhibitors) are the current therapy for TSC tumours. Here, we demonstrate a previously unknown intercellular therapeutic effect of rapamycin in altering EV cargo and reducing capacity to promote cell proliferation in the tumour microenvironment. Furthermore, EV cargo proteins have the potential for clinical applications as TSC biomarkers, and we reveal three EV-associated proteins that are elevated in plasma from TSC patients compared to healthy donor plasma.
Keywords: Extracellular vesicles (EVs), fibroblasts, mTORC1, TSC2, tuberous sclerosis complex (TSC), tumour microenvironment
College: Faculty of Medicine, Health and Life Sciences
Funders: Tuberous Sclerosis Association (Grant 2018-S02)
Issue: 6