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A Single Intraperitoneal Secreted Protein Acidic and Rich in Cysteine Injection in Mice Is Towards an Exercise-like

Abdelaziz Ghanemi1,2,3, Mayumi Yoshioka1, Jonny St-Amand1,4

  • 1Functional Genomics Laboratory, Endocrinology and Nephrology Axis, CHU de Québec-Université Laval Research Center, Quebec, QC G1V 4G2, Canada.

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Summary

Secreted protein acidic and rich in cysteine (SPARC) injection acutely mimics exercise benefits, improving glucose metabolism and muscle development. This finding supports SPARC-based therapies for individuals unable to exercise.

Keywords:
acute effectagingexerciseinjectionmetabolismsecreted protein acidic and rich in cysteine (SPARC)

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Exercise Physiology

Background:

  • Secreted protein acidic and rich in cysteine (SPARC) mediates exercise effects.
  • Previous studies focused on chronic SPARC effects, necessitating investigation into acute impacts.
  • SPARC overexpression mimics exercise benefits, while knockout increases aging.

Purpose of the Study:

  • To investigate the acute molecular and metabolic effects of a single SPARC injection in mice.
  • To explore SPARC's potential to replicate exercise-induced benefits pharmacologically.

Main Methods:

  • Mice were injected with SPARC or saline and sacrificed after 4 hours.
  • Body weight, tissue weights, and glycemia were measured.
  • Muscle protein expression related to metabolism, development, and homeostasis was analyzed via Western blot.

Main Results:

  • SPARC injection promoted protein expression patterns favoring glucose metabolism, oxidative phosphorylation, and mitochondrial biogenesis.
  • Evidence suggested enhanced extracellular matrix remodeling, myogenesis, and protein synthesis.
  • Decreased muscle protein degradation was observed, with no significant impact on glycemia.

Conclusions:

  • Acute SPARC injection elicits molecular changes that mimic key exercise benefits.
  • SPARC-based pharmacology could offer therapeutic alternatives for individuals with limited mobility.
  • Findings pave the way for treatments targeting anti-aging, metabolic enhancement, and muscle development.