Dr. Nam and Ms. Perera contributed equally to this work.
Transcriptome-wide gene regulation by gentle treadmill walking during the progression of monoiodoacetate-induced arthritis
Article first published online: 31 MAY 2011
Copyright © 2011 by the American College of Rheumatology
Arthritis & Rheumatism
Volume 63, Issue 6, pages 1613–1625, June 2011
How to Cite
Nam, J., Perera, P., Liu, J., Wu, L. C., Rath, B., Butterfield, T. A. and Agarwal, S. (2011), Transcriptome-wide gene regulation by gentle treadmill walking during the progression of monoiodoacetate-induced arthritis. Arthritis & Rheumatism, 63: 1613–1625. doi: 10.1002/art.30311
- Issue published online: 31 MAY 2011
- Article first published online: 31 MAY 2011
- Accepted manuscript online: 11 MAR 2011 12:25PM EST
- Manuscript Accepted: 16 FEB 2011
- Manuscript Received: 10 NOV 2010
- NIH (National Institute of Arthritis, Musculoskeletal, and Skin Diseases). Grant Number: AR-048781
- National Institute of Craniofacial and Dental Research. Grant Numbers: DE-015399, DE-014320
Physiotherapies are the most widely recommended conservative treatment for arthritic diseases. The present study was undertaken to examine the molecular mechanisms underlying the effects of gentle treadmill walking (GTW) on various stages of monoiodoacetate-induced arthritis (MIA) to elucidate the basis for the success or failure of such therapies in joint damage.
Knees were obtained from untreated control rats, rats with MIA that did not undergo GTW, rats with MIA in which GTW regimens were started 1 day post–MIA induction, and rats with MIA in which GTW regimens were started after cartilage damage had progressed to grade 1 or grade 2. The cartilage was examined macroscopically, microscopically, and by microfocal computed tomography imaging. Transcriptome-wide gene expression analysis was performed, and microarray data were assessed by Ingenuity Pathways Analysis to identify molecular functional networks regulated by GTW.
GTW intervention started on day 1 post–MIA induction significantly prevented the progression of MIA, but its efficacy was reduced when implemented on knees exhibiting close to grade 1 cartilage damage. GTW accelerated cartilage damage in knees with close to grade 2 damage. Transcriptome-wide gene expression analysis revealed that GTW intervention started 1 day post–MIA inception significantly suppressed inflammation-associated genes and up-regulated matrix-associated gene networks. However, delayed GTW intervention after grade 1 damage had occurred was less effective in suppressing proinflammatory genes or up-regulating matrix synthesis.
The present findings suggest that GTW suppresses proinflammatory gene networks and up-regulates matrix synthesis to prevent progression of cartilage damage in MIA-affected knees. However, the extent of cartilage damage at the initiation of GTW may be an important determinant of the success or failure of such therapies.