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Lopes E, Machado-Oliveira G, Simões CG, Ferreira IS, Ramos C, Ramalho J, Soares MIL, Melo TMVDPE, Puertollano R, Marques ARA, Vieira OV. Cholesteryl Hemiazelate Present in Cardiovascular Disease Patients Causes Lysosome Dysfunction in Murine Fibroblasts. Cells 2023; 12:2826. [PMID: 38132146 PMCID: PMC10741512 DOI: 10.3390/cells12242826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 12/05/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023] Open
Abstract
There is growing evidence supporting the role of fibroblasts in all stages of atherosclerosis, from the initial phase to fibrous cap and plaque formation. In the arterial wall, as with macrophages and vascular smooth muscle cells, fibroblasts are exposed to a myriad of LDL lipids, including the lipid species formed during the oxidation of their polyunsaturated fatty acids of cholesteryl esters (PUFA-CEs). Recently, our group identified the final oxidation products of the PUFA-CEs, cholesteryl hemiesters (ChE), in tissues from cardiovascular disease patients. Cholesteryl hemiazelate (ChA), the most prevalent lipid of this family, is sufficient to impact lysosome function in macrophages and vascular smooth muscle cells, with consequences for their homeostasis. Here, we show that the lysosomal compartment of ChA-treated fibroblasts also becomes dysfunctional. Indeed, fibroblasts exposed to ChA exhibited a perinuclear accumulation of enlarged lysosomes full of neutral lipids. However, this outcome did not trigger de novo lysosome biogenesis, and only the lysosomal transcription factor E3 (TFE3) was slightly transcriptionally upregulated. As a consequence, autophagy was inhibited, probably via mTORC1 activation, culminating in fibroblasts' apoptosis. Our findings suggest that the impairment of lysosome function and autophagy and the induction of apoptosis in fibroblasts may represent an additional mechanism by which ChA can contribute to the progression of atherosclerosis.
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Affiliation(s)
- Elizeth Lopes
- iNOVA4Health, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1150-069 Lisbon, Portugal; (E.L.); (G.M.-O.); (C.G.S.); (I.S.F.); (C.R.); (J.R.)
| | - Gisela Machado-Oliveira
- iNOVA4Health, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1150-069 Lisbon, Portugal; (E.L.); (G.M.-O.); (C.G.S.); (I.S.F.); (C.R.); (J.R.)
| | - Catarina Guerreiro Simões
- iNOVA4Health, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1150-069 Lisbon, Portugal; (E.L.); (G.M.-O.); (C.G.S.); (I.S.F.); (C.R.); (J.R.)
| | - Inês S. Ferreira
- iNOVA4Health, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1150-069 Lisbon, Portugal; (E.L.); (G.M.-O.); (C.G.S.); (I.S.F.); (C.R.); (J.R.)
| | - Cristiano Ramos
- iNOVA4Health, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1150-069 Lisbon, Portugal; (E.L.); (G.M.-O.); (C.G.S.); (I.S.F.); (C.R.); (J.R.)
| | - José Ramalho
- iNOVA4Health, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1150-069 Lisbon, Portugal; (E.L.); (G.M.-O.); (C.G.S.); (I.S.F.); (C.R.); (J.R.)
| | - Maria I. L. Soares
- Coimbra Chemistry Centre (CQC)–Institute of Molecular Sciences and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal; (M.I.L.S.); (T.M.V.D.P.e.M.)
| | - Teresa M. V. D. Pinho e Melo
- Coimbra Chemistry Centre (CQC)–Institute of Molecular Sciences and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal; (M.I.L.S.); (T.M.V.D.P.e.M.)
| | - Rosa Puertollano
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health (NIH), Bethesda, MD 20892, USA;
| | - André R. A. Marques
- iNOVA4Health, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1150-069 Lisbon, Portugal; (E.L.); (G.M.-O.); (C.G.S.); (I.S.F.); (C.R.); (J.R.)
| | - Otília V. Vieira
- iNOVA4Health, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1150-069 Lisbon, Portugal; (E.L.); (G.M.-O.); (C.G.S.); (I.S.F.); (C.R.); (J.R.)
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