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Jaenisch RB, Stefani GP, Durante C, Chechi C, Hentschke VS, Rossato DD, Sonza A, Rhoden CR, Dal Lago P. Respiratory muscle training decreases diaphragm DNA damage in rats with heart failure. Can J Physiol Pharmacol 2018; 96:221-226. [DOI: 10.1139/cjpp-2017-0069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Respiratory muscle training (RMT) promotes beneficial effects on respiratory mechanics, heart and lung morphological changes, and hemodynamic variables in rats with heart failure (HF). However, the relation between RMT effects and diaphragm oxidative stress remains unclear. Therefore, the aim of this study was to evaluate the RMT effects on diaphragm DNA damage in HF rats. Wistar rats were allocated into 4 groups: sedentary sham (Sed-Sham, n = 8), trained sham (RMT-Sham, n = 8), sedentary HF (Sed-HF, n = 8), and trained HF (RMT-HF, n = 8). The animals underwent a RMT protocol (30 min/day, 5 days/week for 6 weeks), whereas sedentary animals did not exercise. Groups were compared by a two-way ANOVA and Tukey’s post hoc tests. In rats with HF, RMT promoted reduction in pulmonary congestion (p < 0.0001) and left ventricular end diastolic pressure (p < 0.0001). Moreover, RMT produced a decrease in the diaphragm DNA damage in HF rats. This was demonstrated through the reduction in the percentage of tail DNA (p < 0.0001), tail moment (p < 0.01), and Olive tail moment (p < 0.001). These findings showed that a 6-week RMT protocol in rats with HF promoted an improvement in hemodynamic function and reduces diaphragm DNA damage.
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Affiliation(s)
- Rodrigo B. Jaenisch
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Giuseppe P. Stefani
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Camila Durante
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Chalyne Chechi
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Vítor S. Hentschke
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Douglas D. Rossato
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Anelise Sonza
- Physical Therapy Department, Santa Catarina State University, Florianópolis, Santa Catarina, Brazil
- Post Graduation Program in Rehabilitation Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Cláudia R. Rhoden
- Laboratory of Atmospheric Pollution and Oxidative Stress, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Pedro Dal Lago
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Post Graduation Program in Rehabilitation Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Physical Therapy Department, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
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Takahashi H, Tamaki H, Yamamoto N, Onishi H. Articular chondrocyte alignment in the rat after surgically induced osteoarthritis. J Phys Ther Sci 2017; 29:598-604. [PMID: 28533592 PMCID: PMC5430255 DOI: 10.1589/jpts.29.598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Accepted: 12/15/2016] [Indexed: 11/24/2022] Open
Abstract
[Purpose] Chondrocytes in articular cartilage are aligned as columns from the joint
surface. Notably, loss of chondrocyte and abnormalities of differentiation factors give
rise to osteoarthritis (OA). However, the relationship between chondrocyte alignment and
OA progression remains unclear. This study was performed to investigate temporal
alterations in surgically-induced OA rats. [Subjects and Methods] Thirteen-week-old Wistar
rats (n=30) underwent destabilized medial meniscus surgery in their right knee and sham
surgery in their left knee. Specimens (n=5) were collected at 0, 1, 2, 4 and 8 weeks after
surgery. Histological analysis with Osteoarthritis Research Society International (OARSI)
scores, cell density ratios, cell alignments and correlation between OARSI scores and cell
density/alignment was performed. [Results] OARSI scores were significantly higher at 1, 2,
4 and 8 weeks in the DMM group than in the control. Cell density ratios were decreased
significantly in the DMM group at 2, 4 and 8 weeks compared with the control. Chondrocyte
alignment was decreased significantly in the DMM group at 4 and 8 weeks. There were
negative correlations between OA severity and cell density / cell alignment. [Conclusion]
The results suggest a relationship between chondrocyte alignment and cartilage
homeostasis, which plays an important role in OA progression.
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Affiliation(s)
- Hideaki Takahashi
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Japan.,Department of Physical Therapy, Niigata University of Health and Welfare, Japan
| | - Hiroyuki Tamaki
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Japan.,Department of Physical Therapy, Niigata University of Health and Welfare, Japan
| | - Noriaki Yamamoto
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Japan.,Department of Orthopaedic Surgery, Niigata Rehabilitation Hospital, Japan
| | - Hideaki Onishi
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Japan.,Department of Physical Therapy, Niigata University of Health and Welfare, Japan
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