Neutrophil Depletion Attenuates Muscle Injury after Exhaustive Exercise
| Autor: | Noriaki Kawanishi, Katsuhiko Suzuki, Tsubasa Mizokami, Hiroyuki Niihara, Koichi Yada |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Male
0301 basic medicine medicine.medical_specialty Neutrophils medicine.medical_treatment Physical Therapy Sports Therapy and Rehabilitation Inflammation Proinflammatory cytokine Random Allocation 03 medical and health sciences Gastrocnemius muscle 0302 clinical medicine Physical Conditioning Animal Internal medicine medicine Animals Myocyte Orthopedics and Sports Medicine RNA Messenger Muscle Skeletal Interleukin-6 Tumor Necrosis Factor-alpha business.industry Macrophages Skeletal muscle medicine.disease Mice Inbred C57BL 030104 developmental biology Endocrinology Cytokine medicine.anatomical_structure Immunology Tumor necrosis factor alpha medicine.symptom business Infiltration (medical) 030217 neurology & neurosurgery |
| Zdroj: | Medicine & Science in Sports & Exercise. 48:1917-1924 |
| ISSN: | 0195-9131 |
| DOI: | 10.1249/mss.0000000000000980 |
| Popis: | AB Purpose: The infiltration of macrophages in skeletal muscle during exhaustive exercise promotes inflammation, myofiber lesion, and muscle injury. Although neutrophils upregulate macrophage infiltration in skeletal muscles during exercise, the role of neutrophils in promoting muscle injury after exhaustive exercise remains unclear. In this study, we investigated the effects of preexercise neutrophil depletion with antineutrophil antibody treatment on muscle injury, inflammation, and macrophage infiltration after exhaustive exercise. Methods: Male C57BL/6J mice were randomly assigned to four groups, namely, sedentary with control antibody (n = 10), sedentary with antineutrophil antibody (n = 10), exhaustive exercise with control antibody (n = 10), and exhaustive exercise with antineutrophil antibody (n = 10). The mice were given intraperitoneal injection of the antineutrophil antibody (anti-Ly-6G, clone 1A8) or the control antibody (anti-Ly-6G, clone 2A3), and remained inactive or performed exhaustive exercise on a treadmill 48 h after the injection. Twenty-four hours after the exhaustive exercise, the gastrocnemius muscles were removed for histological and polymerase chain reaction (PCR) analyses. Infiltration of neutrophils and macrophages was evaluated with Ly-6G and F4/80 immunohistochemistry staining procedures. Muscle fiber injury was detected based on the number of IgG staining fiber. The mRNA expression levels of proinflammatory cytokines and chemokines were evaluated with real-time reverse transcription PCR. Results: Exhaustive exercise increased neutrophil infiltration into the gastrocnemius muscle substantially by 3.1-fold and caused muscle injury, but these effects were markedly suppressed by preexercise treatment with antineutrophil antibody (neutrophil infiltration, 0.42-fold, and muscle injury, 0.18-fold). Treatment with antineutrophil antibody also decreased macrophage infiltration (0.44-fold) and mRNA expression of tumor necrosis factor-[alpha] (0.55-fold) and interleukin-6 (0.51-fold) in the skeletal muscle after exhaustive exercise. Conclusion: These results suggest that neutrophils contribute to exacerbating muscle injury by regulating inflammation through the induction of macrophage infiltration. (C) 2016 American College of Sports Medicine |
| Databáze: | OpenAIRE |
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