1
|
Lin KH, Hibbert JE, Lemens JL, Torbey MM, Steinert ND, Flejsierowicz PM, Melka KM, Lares M, Setaluri V, Hornberger TA. The role of satellite cell-derived TRIM28 in mechanical load- and injury-induced myogenesis. bioRxiv 2023:2023.12.20.572566. [PMID: 38187693 PMCID: PMC10769277 DOI: 10.1101/2023.12.20.572566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Satellite cells are skeletal muscle stem cells that contribute to postnatal muscle growth, and they endow skeletal muscle with the ability to regenerate after a severe injury. Here we discovered that this myogenic potential of satellite cells requires a protein called tripartite motif-containing 28 (TRIM28). Unexpectedly, multiple lines of both in vitro and in vivo evidence revealed that the myogenic function of TRIM28 is not dependent on changes in the phosphorylation of its serine 473 residue. Moreover, the functions of TRIM28 were not mediated through the regulation of satellite cell proliferation or differentiation. Instead, our findings indicate that TRIM28 regulates the ability of satellite cells to progress through the process of fusion. Specifically, we discovered that TRIM28 controls the expression of a fusogenic protein called myomixer and concomitant fusion pore formation. Collectively, the outcomes of this study expose the framework of a novel regulatory pathway that is essential for myogenesis.
Collapse
Affiliation(s)
- Kuan-Hung Lin
- Department of Comparative Biosciences, University of Wisconsin - Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, WI, USA
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA, USA
| | - Jamie E. Hibbert
- Department of Comparative Biosciences, University of Wisconsin - Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, WI, USA
| | - Jake L. Lemens
- Department of Comparative Biosciences, University of Wisconsin - Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, WI, USA
| | - Melissa M. Torbey
- Department of Comparative Biosciences, University of Wisconsin - Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, WI, USA
| | - Nathaniel D. Steinert
- Department of Comparative Biosciences, University of Wisconsin - Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, WI, USA
| | - Philip M. Flejsierowicz
- Department of Comparative Biosciences, University of Wisconsin - Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, WI, USA
| | - Kiley M. Melka
- Department of Comparative Biosciences, University of Wisconsin - Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, WI, USA
| | - Marcos Lares
- Department of Dermatology, University of Wisconsin - Madison, WI, USA
| | | | - Troy A. Hornberger
- Department of Comparative Biosciences, University of Wisconsin - Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, WI, USA
| |
Collapse
|
2
|
Hibbert JE, Jorgenson KW, Zhu WG, Steinert ND, Hornberger TA. Protocol for quantifying the in vivo rate of protein degradation in mice using a pulse-chase technique. STAR Protoc 2023; 4:102574. [PMID: 37729055 PMCID: PMC10517276 DOI: 10.1016/j.xpro.2023.102574] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/21/2023] [Accepted: 08/23/2023] [Indexed: 09/22/2023] Open
Abstract
The ability to measure the in vivo rate of protein degradation is a major limitation in numerous fields of biology. Here, we present a protocol for quantifying this rate in mice using a pulse-chase technique that utilizes an azide-bearing non-canonical amino acid called azidohomoalanine (AHA). We describe steps for using chow containing AHA to pulse-label the animal's proteome. We then detail the quantification of AHA-labeled proteins in whole-tissue lysates or histological sections using a copper-catalyzed azide-alkyne cycloaddition 'click' reaction. For complete details on the use and execution of this protocol, please refer to Steinert et al. (2023).1.
Collapse
Affiliation(s)
- Jamie E Hibbert
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI 53706, USA; School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI 53706, USA.
| | - Kent W Jorgenson
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI 53706, USA; School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI 53706, USA
| | - Wenyuan G Zhu
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI 53706, USA; School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI 53706, USA
| | - Nathaniel D Steinert
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI 53706, USA; School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI 53706, USA
| | - Troy A Hornberger
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI 53706, USA; School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI 53706, USA.
| |
Collapse
|
3
|
Steinert ND, Jorgenson KW, Lin KH, Hermanson JB, Lemens JL, Hornberger TA. A novel method for visualizing in-vivo rates of protein degradation provides insight into how TRIM28 regulates muscle size. iScience 2023; 26:106526. [PMID: 37070069 PMCID: PMC10105291 DOI: 10.1016/j.isci.2023.106526] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 01/27/2023] [Accepted: 03/26/2023] [Indexed: 04/03/2023] Open
Abstract
Skeletal muscle size is controlled by the balance between protein synthesis and protein degradation. Given the essential role of skeletal muscle in maintaining a high quality of life, understanding the mechanisms that modulate this balance are of critical importance. Previously, we demonstrated that muscle-specific knockout of TRIM28 reduces muscle size and function and in the current study, we discovered that this effect is associated with an increase in protein degradation and a dramatic reduction in the expression of Mettl21c. Importantly, we also determined that overexpression of Mettl21c is sufficient to induce hypertrophy in both control and TRIM28 knockout muscles. Moreover, we developed a simple pulse-chase biorthogonal non-canonical amino acid tagging technique that enabled us to visualize the in vivo rate of protein degradation, and with this technique were able to conclude that the hypertrophic effect of Mettl21c is due, at least in part, to an inhibition of protein degradation.
Collapse
Affiliation(s)
- Nathaniel D. Steinert
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI, USA
| | - Kent W. Jorgenson
- Department of Molecular and Cellular Pharmacology, University of Wisconsin - Madison, Madison, WI, USA
- School of Medicine and Public Health, University of Wisconsin - Madison, Madison, WI, USA
| | - Kuan-Hung Lin
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI, USA
| | - Jake B. Hermanson
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI, USA
| | - Jake L. Lemens
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI, USA
| | - Troy A. Hornberger
- Department of Comparative Biosciences, University of Wisconsin - Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin - Madison, Madison, WI, USA
| |
Collapse
|
4
|
Steinert ND, Lin K, Hermanson JB, Hornberger TA. Mechanistic Insights into the Role of TRIM28 in the Regulation of Skeletal Muscle Size. FASEB J 2022. [DOI: 10.1096/fasebj.2022.36.s1.r5893] [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] [Indexed: 11/11/2022]
Affiliation(s)
| | - Kuan‐Hung Lin
- Comparative Biomedical SciencesUniversity of Wisconsin ‐ MadisonMadisonWI
| | | | - Troy A. Hornberger
- Comparative Biomedical SciencesUniversity of Wisconsin ‐ MadisonMadisonWI
| |
Collapse
|
5
|
Zhu WG, Hibbert JE, Lin KH, Steinert ND, Lemens JL, Jorgenson KW, Newman SM, Lamming DW, Hornberger TA. Weight Pulling: A Novel Mouse Model of Human Progressive Resistance Exercise. Cells 2021; 10:cells10092459. [PMID: 34572107 PMCID: PMC8465477 DOI: 10.3390/cells10092459] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 09/08/2021] [Revised: 09/15/2021] [Accepted: 09/16/2021] [Indexed: 12/16/2022] Open
Abstract
This study describes a mouse model of progressive resistance exercise that utilizes a full-body/multi-joint exercise (weight pulling) along with a training protocol that mimics a traditional human paradigm (three training sessions per week, ~8–12 repetitions per set, 2 min of rest between sets, approximately two maximal-intensity sets per session, last set taken to failure, and a progressive increase in loading that is based on the individual’s performance). We demonstrate that weight pulling can induce an increase in the mass of numerous muscles throughout the body. The relative increase in muscle mass is similar to what has been observed in human studies, and is associated with the same type of long-term adaptations that occur in humans (e.g., fiber hypertrophy, myonuclear accretion, and, in some instances, a fast-to-slow transition in Type II fiber composition). Moreover, we demonstrate that weight pulling can induce the same type of acute responses that are thought to drive these long-term adaptations (e.g., the activation of signaling through mTORC1 and the induction of protein synthesis at 1 h post-exercise). Collectively, the results of this study indicate that weight pulling can serve as a highly translatable mouse model of progressive resistance exercise.
Collapse
Affiliation(s)
- Wenyuan G. Zhu
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Jamie E. Hibbert
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Kuan Hung Lin
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Nathaniel D. Steinert
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Jake L. Lemens
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Kent W. Jorgenson
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Sarah M. Newman
- Department of Medicine, University of Wisconsin-Madison, Madison, WI 53705, USA; (S.M.N.); (D.W.L.)
- William S. Middleton Memorial Veterans Hospital, Madison, WI 53705, USA
| | - Dudley W. Lamming
- Department of Medicine, University of Wisconsin-Madison, Madison, WI 53705, USA; (S.M.N.); (D.W.L.)
- William S. Middleton Memorial Veterans Hospital, Madison, WI 53705, USA
| | - Troy A. Hornberger
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53706, USA; (W.G.Z.); (J.E.H.); (K.H.L.); (N.D.S.); (J.L.L.); (K.W.J.)
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706, USA
- Correspondence:
| |
Collapse
|
6
|
Lin KH, Wilson GM, Blanco R, Steinert ND, Zhu WG, Coon JJ, Hornberger TA. A deep analysis of the proteomic and phosphoproteomic alterations that occur in skeletal muscle after the onset of immobilization. J Physiol 2021; 599:2887-2906. [PMID: 33873245 PMCID: PMC8353513 DOI: 10.1113/jp281071] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 04/06/2021] [Indexed: 02/04/2023] Open
Abstract
KEY POINTS A decrease in protein synthesis plays a major role in the loss of muscle mass that occurs in response to immobilization. In mice, immobilization leads to a rapid (within 6 h) and progressive decrease in the rate of protein synthesis and this effect is mediated by a decrease in translational efficiency. Deep proteomic and phosphoproteomic analyses of mouse skeletal muscles revealed that the rapid immobilization-induced decrease in protein synthesis cannot be explained by changes in the abundance or phosphorylation state of proteins that have been implicated in the regulation of translation. ABSTRACT The disuse of skeletal muscle, such as that which occurs during immobilization, can lead to the rapid loss of muscle mass, and a decrease in the rate of protein synthesis plays a major role in this process. Indeed, current dogma contends that the decrease in protein synthesis is mediated by changes in the activity of protein kinases (e.g. mTOR); however, the validity of this model has not been established. Therefore, to address this, we first subjected mice to 6, 24 or 72 h of unilateral immobilization and then used the SUnSET technique to measure changes in the relative rate of protein synthesis. The result of our initial experiments revealed that immobilization leads to a rapid (within 6 h) and progressive decrease in the rate of protein synthesis and that this effect is mediated by a decrease in translational efficiency. We then performed a deep mass spectrometry-based analysis to determine whether this effect could be explained by changes in the expression and/or phosphorylation state of proteins that regulate translation. From this analysis, we were able to quantify 4320 proteins and 15,020 unique phosphorylation sites, and surprisingly, the outcomes revealed that the rapid immobilization-induced decrease in protein synthesis could not be explained by changes in either the abundance, or phosphorylation state, of proteins. The results of our work not only challenge the current dogma in the field, but also provide an expansive resource of information for future studies that are aimed at defining how disuse leads to loss of muscle mass.
Collapse
Affiliation(s)
- Kuan-Hung Lin
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Gary M Wilson
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
- National Center for Quantitative Biology of Complex Systems, Madison, WI, USA
| | - Rocky Blanco
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Nathaniel D Steinert
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Wenyuan G Zhu
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Joshua J Coon
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
- National Center for Quantitative Biology of Complex Systems, Madison, WI, USA
- Morgridge Institute for Research, Madison, WI, USA
- Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Troy A Hornberger
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA
- School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| |
Collapse
|
7
|
You JS, Kim K, Steinert ND, Chen J, Hornberger TA. mTORC1 mediates fiber type-specific regulation of protein synthesis and muscle size during denervation. Cell Death Discov 2021; 7:74. [PMID: 33846288 PMCID: PMC8042034 DOI: 10.1038/s41420-021-00460-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 03/18/2021] [Accepted: 03/25/2021] [Indexed: 02/07/2023] Open
Abstract
Skeletal muscle denervation occurs in diverse conditions and causes severe muscle atrophy. Signaling by mammalian target of rapamycin complex 1 (mTORC1) plays a central role in the maintenance of skeletal muscle mass by regulating net protein balance; yet, its role in denervation-induced atrophy is unclear. In this study, by using skeletal muscle-specific and inducible raptor knockout mice, we demonstrate that signaling through mTORC1 is activated during denervation and plays an essential role in mitigating the atrophy of non-type IIB muscle fibers. Measurements of protein synthesis rates of individual fibers suggest that denervation increases protein synthesis specifically in non-type IIB muscle fibers and that mTORC1 is required for this event. Furthermore, denervation induced a more pronounced increase in the level of phosphorylated ribosomal S6 protein in non-type IIB muscle fibers than in type IIB muscle fibers. Collectively, our results unveil a novel role for mTORC1 in mediating a fiber type-specific regulation of muscle size and protein synthesis during denervation.
Collapse
Affiliation(s)
- Jae-Sung You
- Department of Comparative Biosciences in the School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA.
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
| | - Kookjoo Kim
- Department of Comparative Biosciences in the School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Nathaniel D Steinert
- Department of Comparative Biosciences in the School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Jie Chen
- Department of Cell and Developmental Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Troy A Hornberger
- Department of Comparative Biosciences in the School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA.
| |
Collapse
|
8
|
Steinert ND, Potts GK, Wilson GM, Klamen AM, Lin KH, Hermanson JB, McNally RM, Coon JJ, Hornberger TA. Mapping of the contraction-induced phosphoproteome identifies TRIM28 as a significant regulator of skeletal muscle size and function. Cell Rep 2021; 34:108796. [PMID: 33657380 PMCID: PMC7967290 DOI: 10.1016/j.celrep.2021.108796] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [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: 08/05/2020] [Revised: 01/11/2021] [Accepted: 02/05/2021] [Indexed: 12/25/2022] Open
Abstract
Mechanical signals, such as those evoked by maximal-intensity contractions (MICs), can induce an increase in muscle mass. Rapamycin-sensitive signaling events are widely implicated in the regulation of this process; however, recent studies indicate that rapamycin-insensitive signaling events are also involved. Thus, to identify these events, we generate a map of the MIC-regulated and rapamycin-sensitive phosphoproteome. In total, we quantify more than 10,000 unique phosphorylation sites and find that more than 2,000 of these sites are significantly affected by MICs, but remarkably, only 38 of the MIC-regulated events are mediated through a rapamycin-sensitive mechanism. Further interrogation of the rapamycin-insensitive phosphorylation events identifies the S473 residue on Tripartite Motif-Containing 28 (TRIM28) as one of the most robust MIC-regulated phosphorylation sites, and extensive follow-up studies suggest that TRIM28 significantly contributes to the homeostatic regulation of muscle size and function as well as the hypertrophy that occurs in response to increased mechanical loading.
Collapse
Affiliation(s)
- Nathaniel D Steinert
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA; School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Gregory K Potts
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Gary M Wilson
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Amelia M Klamen
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA; School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Kuan-Hung Lin
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA; School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Jake B Hermanson
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA; School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Rachel M McNally
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA; School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Joshua J Coon
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA; Genome Center of Wisconsin, University of Wisconsin-Madison, Madison, WI, USA; Morgridge Institute for Research, Madison, WI, USA; Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Troy A Hornberger
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, USA; School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA.
| |
Collapse
|