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Choe and An: Effect of DHEA Administration Alone or Exercise combined with DHEA before Steroid Treatment on Rat Hindlimb Muscles
Original Article
Journal of Korean Academy of Nursing

Journal of Korean Academy of Nursing 2009; 39(3): 321-328.

Published online: 29 June 2009

DOI: https://doi.org/10.4040/jkan.2009.39.3.321

Effect of DHEA Administration Alone or Exercise combined with DHEA before Steroid Treatment on Rat Hindlimb Muscles

Myoung-Ae Choe1, Gyeong-Ju An2

1Professor, College of Nursing, Seoul National University, Seoul, Korea.

2Assistant Professor, Department of Nursing, Catholic University of Daegu, Daegu, Korea.

Address reprint requests to: Choe, Myoung-Ae. College of Nursing, Seoul National University, 28 Yeongeon-dong, Jongno-gu, Seoul 110-799, Korea. Tel: 82-2-740-8824, Fax: 82-2-765-4103, machoe@snu.ac.kr

Received 29 December 2008       Accepted 14 April 2009

Copyright © 2009 Korean Society of Nursing Science

Abstract

Purpose

The purpose of this study was to determine the effect of Dehydroepiandrosterone (DHEA) administration alone or exercise combined with DHEA before steroid treatment on rat hindlimb muscles.

Methods

Male Sprague-Dawley rats were assigned to one of three groups: a steroid group (S, n=10) that had no treatment for 7 days before steroid treatment; a DHEA-steroid group (DS, n=8) that had 0.34 mmol/kg/day DHEA injection once a day for 7 days before steroid treatment and an exercise+DHEA-steroid group (EDS, n=9) that ran on the treadmill combined with 0.34 mmol/kg/day DHEA injection for 7 days before steroid treatment. At 15 days all rats were anesthetized and soleus, plantaris and gastrocnemius muscles were dissected. Body weight, food intake, muscle weight, myofibillar protein content and cross-sectional area of the dissected muscles were determined.

Results

The DS group showed significant increases (p<.05) as compared to the steroid group in body weight, and muscle weight of gastrocnemius muscles. The EDS group showed significant increases (p<.05) as compared to the S group in body weight, muscle weight, myofibrillar protein content, and Type II fiber cross-sectional area of soleus, plantaris and gastrocnemius muscles.

Conclusion

Exercise combined with DHEA administration before steroid treatment prevents steroid induced muscle atrophy, with exercise combined with DHEA administration being more effective than DHEA administration alone in preventing muscle atrophy.

Keywords: Steroids, Dehydroepiandrosterone, Exercise, Hindlimb, Muscular atrophy

Figures and Tables

Figure 1
Experimental design.
*Muscle dissection.
S=steroid; DS=DHEA-steroid; EDS=exercise+DHEA-steroid.
jkan-39-321-g001
Figure 2
Cross-section of soleus, plantaris and gastrocnemius muscles in S (left), DS (middle) and EDS (right) rats.
The first line is soleus, the second line is plantaris, and the third line is gastrocnemius in S, DS and EDS rats. Cross-section of the soleus, the plantaris and the gastrocnemius muscles in S rats was adapted from a study by Choe & An (2007).
S=steroid; DS=DHEA-steroid; EDS=Exercise+DHEA-steroid; Dark=Type I fiber; light=Type II fiber (ATPase staining, 100×).
jkan-39-321-g002
Table 1
Body Weight and Total Amount of Diet Intake among Steroid (S), DHEA-steroid (DS), and Exercise+DHEA-steroid (EDS) Rats
jkan-39-321-i001

*p<.05; †Data previously published in Choe and An (2007).

n=number of animals.

Table 2
Muscle Weight of Steroid (S), DHEA-steroid (DS), and Exercise+ DHEA-steroid (EDS) Rats
jkan-39-321-i002

*p<.05; †Data previously published in Choe and An (2007).

n=number of animals.

Table 3
Myofibrillar Protein Content of the Hindlimb Muscles in Steroid (S), DHEA-steroid (DS), and Exercise+DHEA-steroid (EDS) Rats
jkan-39-321-i003

*p<.05; †Data previously published in Choe and An (2007).

n=number of animals.

Table 4
Cross-Sectional Area of the Hindlimb Muscles in Steroid (S), DHEA-steroid (DS), and Exercise+DHEA-steroid (EDS) Rats
jkan-39-321-i004

*p<.05; †Data previously published in Choe and An (2007).

n=number of animals.

Notes

This study was funded by the Korea Research Foundation (E00096).

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