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Related Concept Videos

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An increasing function exhibits a rise in output values as input values increase. This behavior is depicted graphically as a curve or line that slopes upward from left to right. Such a function satisfies the condition that if x1 < x2, then f(x1) < f(x2), indicating that the function values grow with increasing inputs. This concept is fundamental in understanding growth trends across various domains, such as population dynamics, financial investments, or resource consumption.The...
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Related Experiment Video

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Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model
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Exercise serum increases GLUT4 in human adipocytes.

Marcelo Flores-Opazo1,2, Arthe Raajendiran1,3, Matthew J Watt1,3

  • 1Department of Physiology, The University of Melbourne, Melbourne, Victoria, Australia.

Experimental Physiology
|February 14, 2019
PubMed
Summary
This summary is machine-generated.

Exercise serum contains factors that increase glucose transporter type 4 (GLUT4) protein in human fat cells. This suggests exercise signals through the blood to regulate fat tissue, impacting glucose uptake.

Keywords:
GLUT4adipocytesexercise serum

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Area of Science:

  • Exercise physiology
  • Metabolic research
  • Cell biology

Background:

  • Exercise enhances glucose uptake in adipose tissue, crucial for metabolic health.
  • Glucose transporter type 4 (GLUT4) is key to insulin-mediated glucose transport into cells.
  • The precise mechanisms by which exercise influences adipose tissue GLUT4 remain under investigation.

Purpose of the Study:

  • To test the hypothesis that circulating factors generated during exercise stimulate adipose tissue GLUT4 expression.
  • To investigate the role of serum components obtained post-exercise in modulating GLUT4 levels in primary human adipocytes.

Main Methods:

  • Serum was collected from healthy subjects before and after a 60-minute cycling exercise bout.
  • Primary human adipocytes were cultured from subcutaneous abdominal adipose tissue.
  • Adipocytes were exposed to 10% serum from pre- or post-exercise conditions for varying durations (6, 12, 24, 48 hours).
  • GLUT4 protein and mRNA expression levels were quantified.

Main Results:

  • Exposure to post-exercise serum significantly increased GLUT4 protein levels in adipocytes by 12% compared to pre-exercise serum.
  • GLUT4 mRNA levels showed an increase after 12 hours of exposure to exercise serum.
  • No significant changes in GLUT4 mRNA were observed at 6 or 24 hours.

Conclusions:

  • Circulating factors present in serum after exercise may mediate the exercise-induced increase in adipose tissue GLUT4 expression.
  • These findings support a signaling role for blood-borne factors in exercise's metabolic adaptations.
  • Further research is warranted to identify specific exercise-induced factors and their origins.