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Sztretye M, Singlár Z, Szabó L, Angyal Á, Balogh N, Vakilzadeh F, Szentesi P, Dienes B, Csernoch L. Improved Tetanic Force and Mitochondrial Calcium Homeostasis by Astaxanthin Treatment in Mouse Skeletal Muscle. Antioxidants (Basel) 2020; 9:antiox9020098. [PMID: 31979219 PMCID: PMC7070261 DOI: 10.3390/antiox9020098] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 01/20/2020] [Accepted: 01/21/2020] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Astaxanthin (AX) a marine carotenoid is a powerful natural antioxidant which protects against oxidative stress and improves muscle performance. Retinol and its derivatives were described to affect lipid and energy metabolism. Up to date, the effects of AX and retinol on excitation-contraction coupling (ECC) in skeletal muscle are poorly described. METHODS 18 C57Bl6 mice were divided into two groups: Control and AX supplemented in rodent chow for 4 weeks (AstaReal A1010). In vivo and in vitro force and intracellular calcium homeostasis was studied. In some experiments acute treatment with retinol was employed. RESULTS The voltage activation of calcium transients (V50) were investigated in single flexor digitorum brevis isolated fibers under patch clamp and no significant changes were found following AX supplementation. Retinol shifted V50 towards more positive values and decreased the peak F/F0 of the calcium transients. The amplitude of tetani in the extensor digitorum longus was significantly higher in AX than in control group. Lastly, the mitochondrial calcium uptake was found to be less prominent in AX. CONCLUSION AX supplementation increases in vitro tetanic force without affecting ECC and exerts a protecting effect on the mitochondria. Retinol treatment has an inhibitory effect on ECC in skeletal muscle.
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Affiliation(s)
- Mónika Sztretye
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
| | - Zoltán Singlár
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
- Doctoral School of Molecular Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - László Szabó
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
- Doctoral School of Molecular Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Ágnes Angyal
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
- Doctoral School of Molecular Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Norbert Balogh
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
- Doctoral School of Molecular Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Faranak Vakilzadeh
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
- Doctoral School of Molecular Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Péter Szentesi
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
| | - Beatrix Dienes
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
| | - László Csernoch
- Department of Physiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary; (M.S.); (Z.S.); (L.S.); (Á.A.); (N.B.); (F.V.); (P.S.); (B.D.)
- Correspondence: ; Tel.: +36-52-255575; Fax: +36-52-255116
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Lawler JM, Kim JH, Kwak HB, Barnes WS. Redox modulation of diaphragm contractility: Interaction between DHPR and RyR channels. Free Radic Biol Med 2010; 49:1969-77. [PMID: 20920578 PMCID: PMC3005760 DOI: 10.1016/j.freeradbiomed.2010.09.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2010] [Revised: 08/28/2010] [Accepted: 09/24/2010] [Indexed: 10/19/2022]
Abstract
Previous reports indicate that reactive oxygen species (ROS) may modulate contractility in skeletal muscle. Although Ca(2+)-sensitivity of the contractile apparatus appears to be a primary site of regulation, dihydropyridine receptor (DHPR or L-type Ca(2+) channels) and calcium efflux in isolated sarcoplasmic reticulum (SR) vesicles appear to be redox sensitive as well. However, DHPR as a target is poorly understood in intact muscles at body temperature, particularly in the diaphragm, a muscle more dependent on external Ca(2+) than locomotor muscles. Previously, we reported that oxidant challenge via xanthine oxidase (XO) alters the K(+) contractures in diaphragm fiber bundles, suggestive of a role of L-type Ca(2+) channels. Contractility of isolated rat diaphragm fiber bundles revealed a biphasic response to ROS challenge that was dose and time dependent. Potentiation of twitch and low-frequency diaphragm fiber bundle contractility with 0.02 U•ml(-1) XO was reversible or partially preventable with washout, dithiothreitol, and the SOD/catalase mimetic EUK-134. The RyR antagonist ruthenium red inhibited xanthine oxidase-induced potentiation, while the RyR agonist caffeine elevated diaphragm twitch and low-frequency tension in a non-additive manner by 55% when introduced simultaneously with ROS challenge. The DHPR antagonist nitrendipine (15 μM) inhibited elevation in low-frequency diaphragm tension produced by ROS challenge. Caffeine threshold tension curves were shifted to the left with 0.02 U•ml(-1) XO, but this effect was partially reversed with 15 μM nitrendipine. These results are consistent with the hypothesis that DHPR redox state and RyR function are modulated in an interactive manner, affecting contractility in intact diaphragm fiber bundles.
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Affiliation(s)
- John M Lawler
- Department of Health and Kinesiology, Interdisciplinary Faculty of Nutrition, Texas A&M University, College Station, TX 77843-4243, USA.
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Lawler JM, Hu Z, Barnes WS. Effect of reactive oxygen species on K+ contractures in the rat diaphragm. J Appl Physiol (1985) 1998; 84:948-53. [PMID: 9480956 DOI: 10.1152/jappl.1998.84.3.948] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Reactive oxygen species (ROS) are postulated to alter low-frequency contractility of the unfatigued and fatigued diaphragm. It has been proposed that ROS affect contractility through changes in membrane excitability and excitation-contraction coupling. If this hypothesis is true, then ROS should alter depolarization-dependent K+ contractures. Xanthine oxidase (0.01 U/ml) + hypoxanthine (1 mM) were used as a source of superoxide anion eliciting oxidative stress on diaphragm fiber bundles in vitro. Diaphragm fiber bundles from 4-mo-old Fischer 344 rats were extracted and immediately placed in Krebs solution bubbled with 95% O2-5% CO2. After 10 min of equilibration, a K+ contracture (Pre; 135 mM KCl) was induced. Fiber bundles were assigned to the following treatment groups: normal Krebs-Ringer (KR; Con) and the xanthine oxidase system (XO) in KR solution. After 15 min of treatment exposure, a second (Post) K+ contracture was elicited. Mean time-to-peak tension for contractures was significantly decreased in Post vs. Pre (16.0 +/- 0.7 vs. 19.8 +/- 1.0 s) with XO; no change was noted with Con. Furthermore, peak contracture tension was significantly higher (31.5%) in the XO group Post compared with Pre; again, no significant change was found with KR. The relaxation phase was also altered with XO but not with KR. Additional experiments were conducted with application of 1 mM hypoxanthine, with results similar to the Con group. We conclude that the application of ROS altered the dynamics of K+ contractures in the rat diaphragm, indicating changes in voltage-dependent excitation-contraction coupling.
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Affiliation(s)
- J M Lawler
- Respiratory Muscle Laboratory, Eloise Beard Smith Human Performance Laboratories, Department of Health and Kinesiology, Texas A&M University, College Station, Texas 77843-4243, USA
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