1
|
Makarewich CA, Munir AZ, Schiattarella GG, Bezprozvannaya S, Raguimova ON, Cho EE, Vidal AH, Robia SL, Bassel-Duby R, Olson EN. The DWORF micropeptide enhances contractility and prevents heart failure in a mouse model of dilated cardiomyopathy. eLife 2018; 7:e38319. [PMID: 30299255 PMCID: PMC6202051 DOI: 10.7554/elife.38319] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 09/26/2018] [Indexed: 01/01/2023] Open
Abstract
Calcium (Ca2+) dysregulation is a hallmark of heart failure and is characterized by impaired Ca2+ sequestration into the sarcoplasmic reticulum (SR) by the SR-Ca2+-ATPase (SERCA). We recently discovered a micropeptide named DWORF (DWarf Open Reading Frame) that enhances SERCA activity by displacing phospholamban (PLN), a potent SERCA inhibitor. Here we show that DWORF has a higher apparent binding affinity for SERCA than PLN and that DWORF overexpression mitigates the contractile dysfunction associated with PLN overexpression, substantiating its role as a potent activator of SERCA. Additionally, using a well-characterized mouse model of dilated cardiomyopathy (DCM) due to genetic deletion of the muscle-specific LIM domain protein (MLP), we show that DWORF overexpression restores cardiac function and prevents the pathological remodeling and Ca2+ dysregulation classically exhibited by MLP knockout mice. Our results establish DWORF as a potent activator of SERCA within the heart and as an attractive candidate for a heart failure therapeutic.
Collapse
Affiliation(s)
- Catherine A Makarewich
- Department of Molecular Biology and Hamon Center for Regenerative Science and MedicineUniversity of Texas Southwestern Medical CenterDallasUnited States
| | - Amir Z Munir
- Department of Molecular Biology and Hamon Center for Regenerative Science and MedicineUniversity of Texas Southwestern Medical CenterDallasUnited States
| | - Gabriele G Schiattarella
- Department of Internal MedicineUniversity of Texas Southwestern Medical CenterDallasUnited States
| | - Svetlana Bezprozvannaya
- Department of Molecular Biology and Hamon Center for Regenerative Science and MedicineUniversity of Texas Southwestern Medical CenterDallasUnited States
| | - Olga N Raguimova
- Department of Cell and Molecular PhysiologyLoyola University ChicagoMaywoodUnited States
| | - Ellen E Cho
- Department of Cell and Molecular PhysiologyLoyola University ChicagoMaywoodUnited States
| | - Alexander H Vidal
- Department of Molecular Biology and Hamon Center for Regenerative Science and MedicineUniversity of Texas Southwestern Medical CenterDallasUnited States
| | - Seth L Robia
- Department of Cell and Molecular PhysiologyLoyola University ChicagoMaywoodUnited States
| | - Rhonda Bassel-Duby
- Department of Molecular Biology and Hamon Center for Regenerative Science and MedicineUniversity of Texas Southwestern Medical CenterDallasUnited States
| | - Eric N Olson
- Department of Molecular Biology and Hamon Center for Regenerative Science and MedicineUniversity of Texas Southwestern Medical CenterDallasUnited States
| |
Collapse
|
2
|
Papizan JB, Vidal AH, Bezprozvannaya S, Bassel-Duby R, Olson EN. Cullin-3-RING ubiquitin ligase activity is required for striated muscle function in mice. J Biol Chem 2018; 293:8802-8811. [PMID: 29653945 DOI: 10.1074/jbc.ra118.002104] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 04/12/2018] [Indexed: 12/25/2022] Open
Abstract
Control of protein homeostasis is an essential cellular process that, when perturbed, can result in the deregulation or toxic accumulation of proteins. Owing to constant mechanical stress, striated muscle proteins are particularly prone to wear and tear and require several protein quality-control mechanisms to coordinate protein turnover and removal of damaged proteins. Kelch-like proteins, substrate adapters for the Cullin-3 (Cul3)-RING ligase (CRL3) complex, are emerging as critical regulators of striated muscle development and function, highlighting the importance of Cul3-mediated proteostasis in muscle function. To explore the role of Cul3-mediated proteostasis in striated muscle, here we deleted Cul3 specifically in either skeletal muscle (SkM-Cul3 KO) or cardiomyocytes (CM-Cul3 KO) of mice. The loss of Cul3 caused neonatal lethality and dramatic alterations in the proteome, which were unique to each striated muscle type. Many of the proteins whose expression was significantly changed in the SkM-Cul3 KO were components of the extracellular matrix and sarcomere, whereas proteins altered in the CM-Cul3 KO were involved in metabolism. These findings highlight the requirement for striated muscle-specific CRL3 activity and indicate how the CRL3 complex can control different nodes of protein interaction networks in different types of striated muscle. Further identification of Cul3 substrates, and how these substrates are targeted, may reveal therapeutic targets and treatment regimens for striated muscle diseases.
Collapse
Affiliation(s)
- James B Papizan
- From the Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Alexander H Vidal
- From the Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Svetlana Bezprozvannaya
- From the Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Rhonda Bassel-Duby
- From the Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Eric N Olson
- From the Department of Molecular Biology, Hamon Center for Regenerative Science and Medicine, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| |
Collapse
|
3
|
Nghiem PP, Bello L, Stoughton WB, López SM, Vidal AH, Hernandez BV, Hulbert KN, Gourley TR, Bettis AK, Balog-Alvarez CJ, Heath-Barnett H, Kornegay JN. Changes in Muscle Metabolism are Associated with Phenotypic Variability in Golden Retriever Muscular Dystrophy. Yale J Biol Med 2017; 90:351-360. [PMID: 28955176 PMCID: PMC5612180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Duchenne muscular dystrophy (DMD) is an X-chromosome-linked disorder and the most common monogenic disease in people. Affected boys are diagnosed at a young age, become non-ambulatory by their early teens, and succumb to cardiorespiratory failure by their thirties. Despite being a monogenic condition resulting from mutations in the DMD gene, affected boys have noteworthy phenotypic variability. Efforts have identified genetic modifiers that could modify disease progression and be pharmacologic targets. Dogs affected with golden retriever muscular dystrophy (GRMD) have absent dystrophin and demonstrate phenotypic variability at the functional, histopathological, and molecular level. Our laboratory is particularly interested in muscle metabolism changes in dystrophin-deficient muscle. We identified several metabolic alterations, including myofiber type switching from fast (type II) to slow (type I), reduced glycolytic enzyme expression, reduced and morphologically abnormal mitochondria, and differential AMP-kinase phosphorylation (activation) between hypertrophied and wasted muscle. We hypothesize that muscle metabolism changes are, in part, responsible for phenotypic variability in GRMD. Pharmacological therapies aimed at modulating muscle metabolism can be tested in GRMD dogs for efficacy.
Collapse
Affiliation(s)
- Peter P. Nghiem
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX,To whom all correspondence should be addressed: Peter P. Nghiem, DVM, Ph.D., Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, 4458 TAMU, College Station, TX 77843-4458, Tel: (979) 862-9118,
| | - Luca Bello
- Department of Neurosciences, University of Padova, Padova, Italy
| | - William B. Stoughton
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Sara Mata López
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Alexander H. Vidal
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Briana V. Hernandez
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Katherine N. Hulbert
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Taylor R. Gourley
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Amanda K. Bettis
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Cynthia J. Balog-Alvarez
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Heather Heath-Barnett
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| | - Joe N. Kornegay
- The Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
| |
Collapse
|