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Johnson K, Vaughan L, Dulin J, Higgins E, Southard A. A Single-Center Analysis of Palliative-Care Clinician Contact Following Declination of Advanced Heart Failure Therapy. J Card Fail 2024:S1071-9164(24)00012-5. [PMID: 38280411 DOI: 10.1016/j.cardfail.2023.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 12/07/2023] [Accepted: 12/21/2023] [Indexed: 01/29/2024]
Affiliation(s)
- Kolby Johnson
- Division of General Internal Medicine, Medical University of South Carolina, Charleston, South Carolina.
| | - Leigh Vaughan
- Division of General Internal Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Jennifer Dulin
- Division of General Internal Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Elizabeth Higgins
- Division of General Internal Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Abigail Southard
- Division of General Internal Medicine, Medical University of South Carolina, Charleston, South Carolina
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Law BA, Liao X, Moore KS, Southard A, Roddy P, Ji R, Szulc Z, Bielawska A, Schulze PC, Cowart LA. Lipotoxic very-long-chain ceramides cause mitochondrial dysfunction, oxidative stress, and cell death in cardiomyocytes. FASEB J 2018; 32:1403-1416. [PMID: 29127192 DOI: 10.1096/fj.201700300r] [Citation(s) in RCA: 127] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Accumulating data support a role for bioactive lipids as mediators of lipotixicity in cardiomyocytes. One class of these, the ceramides, constitutes a family of molecules that differ in structure and are synthesized by distinct enzymes, ceramide synthase (CerS)1-CerS6. Data support that specific ceramides and the enzymes that catalyze their formation play distinct roles in cell function. In a mouse model of diabetic cardiomyopathy, sphingolipid profiling revealed increases in not only the CerS5-derived ceramides but also in very long chain (VLC) ceramides derived from CerS2. Overexpression of CerS2 elevated VLC ceramides caused insulin resistance, oxidative stress, mitochondrial dysfunction, and mitophagy. Palmitate induced CerS2 and oxidative stress, mitophagy, and apoptosis, which were prevented by depletion of CerS2. Neither overexpression nor knockdown of CerS5 had any function in these processes, suggesting a chain-length dependent impact of ceramides on mitochondrial function. This concept was also supported by the observation that synthetic mitochondria-targeted ceramides led to mitophagy in a manner proportional to N-acyl chain length. Finally, blocking mitophagy exacerbated cell death. Taken together, our results support a model by which CerS2 and VLC ceramides have a distinct role in lipotoxicity, leading to mitochondrial damage, which results in subsequent adaptive mitophagy. Our data reveal a novel lipotoxic pathway through CerS2.-Law, B. A., Liao, X., Moore, K. S., Southard, A., Roddy, P., Ji, R., Szulc, Z., Bielawska, A., Schulze, P. C., Cowart, L. A. Lipotoxic very-long-chain ceramides cause mitochondrial dysfunction, oxidative stress, and cell death in cardiomyocytes.
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Affiliation(s)
- Brittany A Law
- Department of Medicine-Cardiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Xianghai Liao
- Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Kelsey S Moore
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - Abigail Southard
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - Patrick Roddy
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - Ruiping Ji
- Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York, New York, USA
| | - Zdzislaw Szulc
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - Ala Bielawska
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA
| | - P Christian Schulze
- Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York, New York, USA.,Division of Cardiology, Angiology, Pneumology, and Intensive Medical Care, Department of Internal Medicine I, Friedrich-Schiller-University Jena, University of Jena, Jena, Germany; and
| | - L Ashley Cowart
- Department of Biochemistry and Molecular Biology, The Medical University of South Carolina, Charleston, South Carolina, USA.,Department of Veteran's Affairs, Charleston, South Carolina, USA
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