What question did this study set out to answer?

To identify the molecular mechanisms underlying exercise-induced increases in myocardial contractility by analyzing ventricular gene expression profiles in endurance-trained rats.

March 1, 2003AJP Heart and Circulatory Physiology

Microarray expression analysis of effects of exercise training: increase in atrial MLC-1 in rat ventricles

View Full Paper

Ask AI

Bookmark

Why the study?

Does an 11-week treadmill training protocol alter ventricular gene expression in rats?

Population

18 rats (9 trained, 9 control)

Comparison

11-week treadmill training protocol vs Control (no training)

Design

Preclinical

Follow-up

11 weeks

Authors

GDGary M. DiffeeUniversity of Wisconsin–Madison ESEric A. SeversenInternational College of Applied Kinesiology-USA TSThor D. SteinBoston University

Discussion

Member takes

Implication

Rat data offer no clinical guidance; extends molecular evidence for training effects on ventricular gene expression in rodents.

Key Points

To identify the molecular mechanisms underlying exercise-induced increases in myocardial contractility by analyzing ventricular gene expression profiles in endurance-trained rats.
Subjected rats to an 11-week treadmill endurance exercise protocol alongside sedentary controls (N=9 trained, N=9 control).
Isolated ventricular RNA to assess differential gene expression using Affymetrix Rat Genome U34A oligonucleotide microarrays.
Confirmed alterations in target transcript and protein levels using reverse transcription-polymerase chain reaction (RT-PCR) and two-dimensional gel electrophoresis.
Detected altered expression across 27 ventricular genes following the 11-week endurance exercise protocol.
Observed decreased expression of genes typically upregulated in pathological hypertrophy, including atrial natriuretic factor and skeletal alpha-actin.
Identified and validated a significant upregulation of atrial myosin light chain 1 (aMLC-1) mRNA and protein in trained ventricular tissue.

Structured PICO

Does an 11-week treadmill training protocol alter ventricular gene expression in rats?

Population

18 rats (9 trained, 9 control)

Intervention

11-week treadmill training protocol

Comparator

Control (no training)

Outcome

Gene expression profile in ventricles, specifically atrial myosin light chain 1 (aMLC-1) expressionsurrogate

Endurance exercise training increases the expression of atrial myosin light chain 1 in rat ventricles, which may partly explain training-induced enhancements in myocardial contractile function.

Cite This Study

Diffee et al. (2003) studied this question.

synapsesocial.com/papers/6a70d98ffebe604dd7099f65 https://doi.org/10.1152/ajpheart.00761.2002

View Full Paper

Ask AI

Bookmark

Microarray expression analysis of effects of exercise training: increase in atrial MLC-1 in rat ventricles

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Microarray expression analysis of effects of exercise training: increase in atrial MLC-1 in rat ventricles

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider