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Related Experiment Video

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Real-time Analysis of Transcription Factor Binding, Transcription, Translation, and Turnover to Display Global Events During Cellular Activation
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Unbiased comparison and modularization identify time-related transcriptomic reprogramming in exercised rat cartilage:

Jiarui Cui1, Yo Shibata2, Keiji Itaka3

  • 1School of Rehabilitation and Health Preservation, Chengdu University of Traditional Chinese Medicine, Chengdu, China.

Frontiers in Physiology
|October 3, 2022
PubMed
Summary

Exercise impacts cartilage by suppressing detrimental genes over time. While exercise duration influences cellular functions, it reveals early and late gene responses crucial for cartilage health and homeostasis.

Keywords:
cartilageexerciseexercise timeosteoarthritistranscriptome

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Bioinformatics

Background:

  • Exercise is vital for joint health and recommended for knee osteoarthritis.
  • Mechanisms of exercise's effect on cartilage, especially exercise duration, are not fully understood.

Purpose of the Study:

  • To investigate time-related gene and signaling pathway changes in rat cartilage following exercise using bioinformatic analysis.
  • To identify early and late gene responses and their associated cellular functions and signaling pathways.

Main Methods:

  • Transcriptomic data analysis of rat cartilage.
  • Unbiased comparisons and modularization of gene expression.
  • Immunohistochemistry staining for specific gene validation.

Main Results:

  • Exercise significantly altered the cartilage transcriptome, predominantly suppressing genes involved in cell division, hypertrophy, catabolism, inflammation, and immune response.
  • Downregulated genes were more pronounced and stable over time compared to upregulated genes.
  • Exercise duration influenced extracellular matrix homeostasis and cellular responses to growth factors and stress, identifying early (ECM organization, BMP, PI3K-Akt signaling) and late (e.g., EGFR) responsive gene clusters.

Conclusions:

  • Exercise induces time-dependent transcriptomic reprogramming in cartilage.
  • Understanding these time-related changes advances knowledge of cartilage homeostasis and informs exercise prescriptions for joint health.