Kobe University · Graduate School of Health Sciences

Research keywordsmicrocurrent stimulation・pentose phosphate pathway・macrophage inflammation・extracellular vesicles・skeletal muscle atrophy・electrical stimulation・hypoxia-induced autophagy・myogenic differentiation

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• 直流微弱電流はマクロファージ内のペントースリン酸経路の賦活を介して抗酸化・抗炎症作用を発揮する2022 · (一社)日本創傷治癒学会, 2022年11月, 日本創傷治癒学会プログラム・抄録集, 52回, 57 - 57, 日本語
• Enhancement of astaxanthin incorporation by pulsed high-intensity ultrasound in LPS-stimulated macrophages.PURPOSE: Ultrasound (US) has been reported to improve the permeability of cell membranes to pharmaceuticals by causing cavitation. Astaxanthin (AX) potently terminates the induction of inflammation, but it has low oral bioavailability, which limits its incorporation in local cells and organs and its therapeutic potential. In this study, we aimed to investigate the contribution of US to AX incorporation to compensate for the limited incorporation of AX, and regulation of the pro-inflammatory factor interleukin-1β (IL-1β) by AX. METHODS: Murine bone marrow-derived macrophages were stimulated by lipopolysaccharide (LPS). After 2 h, cells were treated with 10 μM AX and/or pulsed high-intensity US irradiation. The cells were then incubated for another 3 h and harvested. AX incorporation in cells was measured by absorbance, and the expression of IL-1β was measured by qPCR. All values are expressed as means ± standard error of the mean. RESULTS: The combination of AX and US significantly increased AX incorporation in cells compared to AX alone (p
• Preventive effect of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) against endotoxin-induced muscle atrophy.BACKGROUND & AIMS: Muscle atrophy is a public health issue and inflammation is a major cause of muscle atrophy. While docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), which are typical ω-3 polyunsaturated fatty acids, are reported to have anti-inflammatory effects on endotoxin-induced inflammatory responses, their effects on inflammatory muscle atrophy have not been clarified. In this study, we aimed to investigate the effects of DHA and EPA on inflammatory muscle atrophy. METHODS: DHA or EPA was added to C2C12 myotubes at a concentration of 25, 50, or 100 μM, and 1 h later, lipopolysaccharide (LPS) was added at a concentration of 1 μg/mL. Two hours after the first LPS addition, mRNA expression of atrogin-1 and Murf-1 in C2C12 myotubes was measured. The second LPS addition was performed 24 h after the first LPS addition, and myotube diameter, myofibrillar protein, and cell viability were measured. One-way ANOVA and Tukey's multiple comparison test were used for statistical processing of the results, and the significance level was set to less than 5 %. RESULTS: The LPS-added group significantly decreased the myotube diameter and the myofibrillar protein content compared to the control group. The myotube diameter was significantly higher in the 25 μM, 50 μM DHA and 25 μM EPA-added groups compared to the LPS group. In the 25 μM DHA and EPA-added groups, the myofibrillar protein content was significantly higher than that in the LPS group. The mRNA expression levels of atrogin-1 and murf-1 were significantly suppressed in the 25 μM DHA and EPA-added groups compared to the LPS group. The cell viability did not change by the addition of LPS, DHA, and EPA. CONCLUSIONS: The addition of DHA or EPA suppressed the decrease in myotube diameter and myofibrillar protein content and suppressed the increase in atrogin-1 and murf-1 induced by LPS. This study showed the preventive effect of DHA and EPA on endotoxin-induced muscle atrophy.
• Protective effects of chlorogenic acid on capillary regression caused by disuse muscle atrophy.Inactivity causes muscle atrophy and capillary regression in skeletal muscle. Chlorogenic acid has an antioxidant capacity and may prevent capillary regression. Therefore, the protective effects of chlorogenic acid on inactivity-induced capillary regression in rat soleus muscle were investigated. Twenty male Wistar rats were randomly divided into four groups: control (CON), chlorogenic acid supplementation (CGA), 2-week hindlimb unloading (HU), 2-week hindlimb unloading plus chlorogenic acid supplementation (HU+CGA). The rats in CGA and HU+CGA groups were orally administrated chlorogenic acid (850 mg/kg/day). Unloading resulted in a decrease in capillary number, oxidative capacity, and an increase in oxidative stress of the soleus muscle, whereas chlorogenic acid supplementation prevented capillary and metabolic changes resulting from unloading by reducing oxidative stress. In conclusion, chlorogenic acid supplementation may qualify as an effective treatment to reduce capillary regression in skeletal muscle caused by disuse muscle atrophy.

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