|Year : 2015 | Volume
| Issue : 1 | Page : 29-33
Recovery of skeletal muscle function following injury is not augmented by acute resveratrol supplementation
Russell G Rogers, Cory W Baumann, Jeffrey S Otis
Department of Kinesiology and Health, Muscle Biology Laboratory, Georgia State University, Atlanta, GA 30302, USA
|Date of Submission||11-Jan-2015|
|Date of Decision||09-Feb-2015|
|Date of Acceptance||23-Feb-2015|
|Date of Web Publication||21-Apr-2015|
Russell G Rogers
Department of Kinesiology and Health, Georgia State University, P. O. Box 3975, Atlanta, GA 30302
Source of Support: This work was supported by the National
Institutes of Health (NIAAA: K01 017190), Conflict of Interest: None
Background and Aim: Skeletal muscle function is significantly reduced following traumatic muscle injury and complete recovery can take several weeks. Pharmacological agents like nonsteroidal anti-inflammatory drugs have been used to minimize pain and inflammation associated with muscle injury. However, their safety and efficacy to improve muscle repair have been challenged. To that end, safer and more effective treatment options remain to be identified. Accordingly, resveratrol use has numerous health benefits in clinical population. Further, resveratrol has been shown to promote myoblast differentiation in0 vitro, which suggests it could be used to improve skeletal muscle regeneration in vivo.
Methods: Experimental mice received resveratrol supplementation (0.05% wt/wt) 4 weeks prior to injury, which persisted throughout recovery. Muscle injury was induced by injecting a diluted barium chloride solution into the tibialis anterior (TA). Isometric tetanic and twitch torque of the anterior crural muscles were measured prior to the injury and 7, 14, or 21 days postinjury.
Results: Resveratrol supplementation had no effect on preinjury isometric tetanic and twitch torque of the anterior crural muscles. Seven days after injury, tetanic torque production was reduced by 80% compared to preinjury values. Functional and structural recovery steadily improved at 14 days and was completed 21 days after injury. However, resveratrol treatment had no beneficial effects on isometric torque or regenerated fiber area.
Conclusion: Acute, low-dose resveratrol supplementation did not improve functional or structural recovery of regenerating mouse TA after injury. Further research is likely required that explores alternate resveratrol dosing strategies and their effects on skeletal muscle repair processes.
Keywords: Fiber cross-sectional area, isometric torque, resveratrol, skeletal muscle regeneration
|How to cite this article:|
Rogers RG, Baumann CW, Otis JS. Recovery of skeletal muscle function following injury is not augmented by acute resveratrol supplementation. Int J Clin Exp Physiol 2015;2:29-33
|How to cite this URL:|
Rogers RG, Baumann CW, Otis JS. Recovery of skeletal muscle function following injury is not augmented by acute resveratrol supplementation. Int J Clin Exp Physiol [serial online] 2015 [cited 2018 Aug 22];2:29-33. Available from: http://www.ijcep.org/text.asp?2015/2/1/29/155515
| Introduction|| |
Intense physical activity or unaccustomed exercise often results in contraction-induced muscle injury, force decrements, and muscle soreness. ,, Recently, our lab has shown that repeated eccentric contractions of the anterior crural muscles resulted in substantial loss of isometric tetanic torque immediately (i.e., 0 day) after the injury.  Further, restoration of tetanic torque took over 2 weeks to return to preinjury levels. Not surprisingly, the initial mode and severity of injury often plays a significant role in the duration of the degenerative and regenerative phases of skeletal muscle repair. For example, Warren et al. (2007) demonstrated freeze injury to the tibialis anterior (TA) resulted in a greater loss of maximal isometric torque immediately after the injury and took longer to fully recover (over 4 weeks) when compared to contraction-induced injury. Further, freeze injury caused a greater degree of damage, increased mononuclear cell infiltration, and increased number of regenerating fibers. Similarly, we have shown that injection of barium chloride (BaCl 2 ) into the mouse TA resulted in extensive damage.  However, the impact of BaCl 2 -induced injury to the TA on tetanic torque production of the anterior compartment musculature remains unknown.
Models of muscle injury such as repeated eccentric contractions, cold probe application, or myotoxin injection provide critical insight into skeletal muscle regenerative processes.  Complete recovery may be long and research has been focused on accelerating skeletal muscle repair with nutraceutical and pharmacological agents.  For example, antioxidants like Vitamin E have been hypothesized to minimize oxidant damage associated with the early inflammatory response after injury.  However, evidence supporting a beneficial role for this antioxidant in muscle repair is unsubstantiated. To that end, clinicians have recommended nonsteroidal anti-inflammatory drugs (NSAIDs) to minimize pain and inflammation early after injury. Further, NSAIDs have been shown to reduce swelling and delay the inflammatory process in injured skeletal muscle, , which may provide a beneficial role in the very early stages of muscle repair. For example, treatment with the NSAID flurbiprofen improved recovery 3 and 7 days after repeated eccentric contractions.  However, a reduction in torque production at 28 days after injury was observed suggesting treatment resulted in delayed muscle regeneration. Therefore, continued research to identify a safe, effective treatment option to improve muscle repair following injury is warranted.
Resveratrol (3, 5, 4'- trihydroxystilbene) is a natural phenol found in high concentrations in the skin of red grapes and its use is becoming increasingly common for chronic diseases such as cancer,  cardiovascular disease,  and diabetes.  Resveratrol supplementation also lowered mortality rates and extended life expectancies in mice fed a high-fat diet.  Resveratrol was also shown to improve exercise endurance, oxidative metabolism, mitochondrial biogenesis, and caloric expenditure.  Importantly, resveratrol also increased C2C12 myoblast differentiation in culture, , which may suggest resveratrol could be used to improve skeletal muscle regeneration in vivo. However, the potential benefits of the extract in a model of muscle injury have not been explored. Accordingly, the purpose of this preliminary study was: (1) to determine the effects of BaCl 2 injection on isometric tetanic and twitch torque production during the recovery process and (2) to identify the impact of resveratrol supplementation during the recovery process.
| Materials and methods|| |
Animals and resveratrol supplementation
Male C57BL/6 mice (~25-30 g) were purchased from Jackson Laboratories (Bar Harbor, ME), housed in groups of 5, supplied food and water ad libitum, and maintained in a room at 20-22°C with a 12 h photoperiod. Experimental mice were provided standard rodent chow supplemented with 0.05% (wt/wt) resveratrol (ChromaDex, Irvine, CA) for 30 days prior to injury, which persisted throughout recovery. Control mice were fed only standard rodent chow (Purina Diet 5001, Indianapolis, IN). All procedures were approved by the Georgia State University Institutional Animal Care and Use Committee.
Barium chloride-induced skeletal muscle injury
A 50-µL volume of a 1.2% BaCl 2 solution (diluted in sterile saline) was injected into the left mouse TA muscles using a 28 G needle as previously described. , The right, contralateral TA muscles served as uninjured controls in both treated and untreated groups. Briefly, the needle was inserted at the origin of the TA, extended through the mid-belly of the muscle to a region just superior to the distal tendon. Next, the diluted BaCl 2 solution was continuously injected into the TA as the syringe was removed. Complete serial sections of the injured TA confirmed that the mid-belly section was affected by the myotoxin. Injured and uninjured contralateral control muscles were harvested postmortem at 2, 7, 14, and 21 days following injury and processed for histological analysis.
In vivo analysis of skeletal muscle function
Torque - frequency relationships of the left anterior crural muscles (TA, extensor digitorum longus, and extensor hallucis longus) were determined as previously described.  Briefly, mice were anesthetized with isoflurane (1.5% isoflurane and 400 mL O 2 /min) and placed on a temperature controlled platform to maintain core body temperature between 35°C and 37°C. The left knee was clamped and the left foot was secured to an aluminum "shoe" attached to the shaft of an Aurora Scientific 300B servomotor (Aurora, ON, Canada). Sterilized needles were inserted through the skin for stimulation of the left common peroneal nerve. Stimulation voltage and needle electrode placement were optimized with 5-15 isometric contractions (200 ms train of 0.1 ms pulses at 300 Hz). Following optimization, isometric torque was quantified as a function of stimulation frequency (20-300 Hz) before injury and at 7, 14, or 21 days postinjury. Mice were then euthanized with an overdose of isoflurane followed by cervical dislocation.
Histological assessment of regeneration in injured tibialis anterior muscles
Injured and uninjured TA muscles were removed, embedded in tissue freezing medium, and immediately frozen in 2-methylbutane cooled in liquid nitrogen. To ensure that we were assessing the most damaged portion of the TA, muscles were cut in serial sections at 10 μm beginning at the mid-belly. Sections were then processed for hematoxylin and eosin staining, dehydrated, mounted, and visualized at ×10 with a VanGaurd light microscope as previously described.  Cross-sectional areas of approximately 200 uninjured or regenerating fibers (i.e. centrally nucleated fibers) were calculated using ImageJ software (NIH, Bethesda, MD).
Statistical analysis of data
Data are presented as means ± standard error of the mean. Comparisons between groups were done using an independent t-test and a two-way factorial (group × time) ANOVA with a Bonferroni post-hoc analysis. All statistical tests were performed with SigmaPlot (Systat Software Inc., San Jose, CA). Significance was accepted at P ≤ 0.05.
| Results|| |
Isometric tetanic and twitch torque of the anterior crural muscles were not different between untreated and resveratrol treated mice prior to the injury (P = 0.074). Two days after the injury, aberrant cellular architecture, mononuclear cell infiltration, and edema were clearly evident in both treated and untreated mice [Figure 1]a]. At this time point, the severity of the injury prevented us from measuring tetanic or twitch torque.
|Figure 1: (a) Histological representation of injured muscle during regeneration. (1) Uninjured mouse tibialis anterior muscle, (2) 2 days, (3) 7 days, (4) 14 days, and (5) 21 days after barium chloride-induced injury. Images shown at ×10 magnification and bar in panel 5 = 100 μm. (b) Bar graph representing cross-sectional area of regenerating fibers. Bars with the same letter are not significantly different (accepted at P≤0.05). Values are reported as means ± standard error of the mean|
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Seven days following the injury, small centrally nucleated fibers (i.e., regenerating fibers) were present [Figure 1]a]. In parallel, tetanic torque and twitch torque from untreated mice were reduced by 80.08% ± 1.20% and 81.41% ± 3.21% [Figure 2]a and b]. However, treated mice showed no statistical improvement in force generation nor regenerated fiber cross-sectional area.
|Figure 2: (a) Bar graph representing tetanic torque deficit. (b) Bar graph representing twitch torque deficit. Bars with the same letter are not significantly different (accepted at P≤0.05). Values are reported as means ± standard error of the mean (SEM)|
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Fourteen days following the injury, regenerating fibers continue to hypertrophy with concomitant attenuation of the strength deficit [Figure 1]a and b]. Specifically, tetanic torque was reduced 22.69% ± 3.27% while twitch torque returned to baseline (−5.33% ± 13.88%) when compared to preinjury values in untreated mice [Figure 2]a and b]. However, resveratrol treatment did not improve these functional deficits nor regenerated fiber cross-sectional area.
Twenty-one days after the injury, cross-sectional area of regenerated fibers was larger than uninjured fibers [Figure 1]a and b]. Further, tetanic and twitch torque were similar to preinjury values [Figure 2]a and b]. Again, resveratrol treatment had no effect on fiber cross-sectional area or these functional markers.
| Discussion|| |
In this study, we attempted to accelerate the recovery of skeletal muscle function following injury with resveratrol. Previous research has shown that resveratrol induced satellite cell differentiation in vitro, , which might suggest that the extract could improve skeletal muscle regeneration when delivered orally as well. Yet, acute low-dose resveratrol supplementation had no effect on recovery of skeletal muscle function and structure following myotoxin-induced injury.
One possible explanation why resveratrol failed to improve regeneration may lie in the severity of the injury. For example, our lab routinely quantifies tetanic and twitch torque in less-severe models of skeletal muscle injury (i.e., repeated eccentric contractions);  however, we were unable to quantify these force outputs during the early stages of muscle repair in the current injury model. Thus, it is possible that the extensive necrosis from BaCl 2 -induced injury may have maximally activated the endogenous repair machinery and treatment with resveratrol was unable to further enhance these processes (e.g., satellite cell activation and proliferation, differentiation and fusion, and re-growth). To that end, supplementation with resveratrol in a less severe model of injury may be required to adequately study its effects on recovery of skeletal muscle function.
Eccentric contraction-induced injury has been shown to damage approximately 5% of the myofibers  and likely does not require maximal activity of satellite cells. Corona and Ingalls  demonstrated L-NAME administration, a compound known to block nitric oxide synthase, exacerbated strength deficits immediately after eccentric contractions suggesting nitric oxide partially protected skeletal muscle from contraction-induced injury. Moreover, resveratrol has been shown to provide cardioprotection via a nitric oxide mechanism and L-NAME administration was shown to attenuate the protection. 
| Conclusion|| |
Acute, low-dose resveratrol supplementation did not improve functional or structural recovery of regenerating mouse TA after injury. This could be due to the dose of resveratrol and duration of treatment used in this study, which may have not been sufficient to promote these repair processes in vivo. For example, pre-conditioning with resveratrol for a longer duration may provide partial protection from injury and enhance the recovery of muscle function. Future research is likely required that explores differential dosing strategies in a physiological injury model. Together, this may provide a therapeutic approach to attenuate the loss of skeletal muscle function and pain associated with intense physical activity or unaccustomed exercise.
| Acknowledgments|| |
This work was supported by the National Institutes of Health (NIAAA: K01 017190).
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