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Analytical biochemistry2020; 610; 113965; doi: 10.1016/j.ab.2020.113965

Purification of sarcoplasmic reticulum vesicles from horse gluteal muscle.

Abstract: We have analyzed protein expression and enzyme activity of the sarcoplasmic reticulum Ca2+-transporting ATPase (SERCA) in horse gluteal muscle. Horses exhibit a high incidence of recurrent exertional rhabdomyolysis, with myosolic Ca2+ proposed, but yet to be established, as the underlying cause. To better assess Ca2+ regulatory mechanisms, we developed an improved protocol for isolating sarcoplasmic reticulum (SR) vesicles from horse skeletal muscle, based on mechanical homogenization and optimized parameters for differential centrifugation. Immunoblotting identified the peak subcellular fraction containing the SERCA1 protein (fast-twitch isoform). Gel analysis using the Stains-all dye demonstrated that calsequestrin (CASQ) and phospholipids are highly enriched in the SERCA-containing subcellular fraction isolated from horse gluteus. Immunoblotting also demonstrated that these horse SR vesicles show low content of glycogen phosphorylase (GP), which is likely an abundant contaminating protein of traditional horse SR preps. The maximal Ca2+-activated ATPase activity (Vmax) of SERCA in horse SR vesicles isolated using this protocol is 5‒25-fold greater than previously-reported SERCA activity in SR preps from horse skeletal muscle. We propose that this new protocol for isolating SR vesicles will be useful for determining enzymatic parameters of horse SERCA with high fidelity, plus assessing regulatory effect of SERCA peptide subunit(s) expressed in horse muscle.
Publication Date: 2020-09-19 PubMed ID: 32956693PubMed Central: PMC7745508DOI: 10.1016/j.ab.2020.113965Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • N.I.H.
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  • Non-U.S. Gov't

Summary

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This research article describes a new method for isolating sarcoplasmic reticulum vesicles from horse muscle tissues. The improved protocol has allowed researchers to better understand the activity and protein expression of a specific enzyme found in horse muscles.

Research Background

  • The sarcoplasmic reticulum Ca-transporting ATPase (SERCA) enzyme in horse muscles was examined in this study, given the high incidence of exertional rhabdomyolysis in horses–a condition suggested to be related to modifications in calcium regulation.
  • The research aimed to generate an improved method for isolating the sarcoplasmic reticulum (SR) vesicles–structures that participate in calcium regulation in muscles–from the gluteal muscle of a horse. Previously, the determination of enzymatic parameters related to SERCA activity in horse muscles had been challenging due to lack of optimized protocols.

Methodology

  • The researchers used a protocol based on mechanical homogenization and optimized parameters for differential centrifugation to isolate the SR vesicles from the horse skeletal muscle.
  • Immunoblotting techniques were used to indicate the presence of SERCA1 protein (the fast-twitch isoform) in the SR subcellular fractions.
  • Gel analysis was performed using the Stains-all dye, a procedure that showed that calsequestrin (CASQ) and phospholipids are significantly enriched in the SERCA-containing fractions.
  • The contamination of the horse SR formations from glycogen phosphorylase (GP), a common contaminating protein, was checked by immunoblotting. The researchers noted that these formations showed a low content of GP.

Key Findings

  • The isolated SR vesicles showed SERCA’s maximal Ca-activated ATPase activity (V) to be 5-25 times higher than previously reported values in similar preparations from horse skeletal muscle, thereby suggesting the effectiveness of the new isolation protocol.
  • From these findings, the researchers propositioned that their new protocol can help in accurately determining the enzymatic parameters of horse SERCA and in assessing the impact of SERCA peptide subunit(s) that are expressed in horse muscles.

Cite This Article

APA
Autry JM, Karim CB, Cocco M, Carlson SF, Thomas DD, Valberg SJ. (2020). Purification of sarcoplasmic reticulum vesicles from horse gluteal muscle. Anal Biochem, 610, 113965. https://doi.org/10.1016/j.ab.2020.113965

Publication

ISSN: 1096-0309
NlmUniqueID: 0370535
Country: United States
Language: English
Volume: 610
Pages: 113965

Researcher Affiliations

Autry, Joseph M
  • Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA. Electronic address: autry001@umn.edu.
Karim, Christine B
  • Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA.
Cocco, Mariana
  • Department of Veterinary Population Medicine, University of Minnesota, St. Paul, MN, 55108, USA.
Carlson, Samuel F
  • Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA.
Thomas, David D
  • Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA.
Valberg, Stephanie J
  • Department of Large Animal Clinical Sciences, McPhail Equine Performance Center, Michigan State University, East Lansing, MI, 48823, USA. Electronic address: valbergs@msu.edu.

MeSH Terms

  • Animals
  • Calcium / metabolism
  • Centrifugation
  • Electrophoresis, Agar Gel
  • Extracellular Vesicles / chemistry
  • Extracellular Vesicles / metabolism
  • Glycogen Phosphorylase / metabolism
  • Horses
  • Muscle, Skeletal / metabolism
  • Protein Isoforms / metabolism
  • Sarcoplasmic Reticulum / metabolism
  • Sarcoplasmic Reticulum Calcium-Transporting ATPases / metabolism

Grant Funding

  • R01 AG026160 / NIA NIH HHS
  • R01 GM027906 / NIGMS NIH HHS
  • R01 HL139065 / NHLBI NIH HHS
  • R37 AG026160 / NIA NIH HHS

Conflict of Interest Statement

Competing Interests Statement. The authors declare that they have no competing interests with the contents of this article.

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Citations

This article has been cited 3 times.
  1. Rivera-Morán MA, Sampedro JG. Isolation of the Sarcoplasmic Reticulum Ca(2+)-ATPase from Rabbit Fast-Twitch Muscle. Methods Protoc 2023 Oct 19;6(5).
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  2. Autry JM, Svensson B, Carlson SF, Chen Z, Cornea RL, Thomas DD, Valberg SJ. Sarcoplasmic Reticulum from Horse Gluteal Muscle Is Poised for Enhanced Calcium Transport. Vet Sci 2021 Nov 23;8(12).
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  3. Autry JM, Karim CB, Perumbakkam S, Finno CJ, McKenzie EC, Thomas DD, Valberg SJ. Sarcolipin Exhibits Abundant RNA Transcription and Minimal Protein Expression in Horse Gluteal Muscle. Vet Sci 2020 Nov 13;7(4).
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