Abstract
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 < 0.05). In addition, this combination further suppressed the expression of IL-1β compared to AX alone (p < 0.05).
Conclusion
Pulsed high-intensity US irradiation combined with AX treatment promoted AX incorporation in cells and enhanced the anti-inflammatory effect on macrophages.
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Acknowledgements
We appreciate the members of our laboratory for their thoughtful technical advice. This study was supported by JSPS KAKENHI [grant numbers 21H03852, 20KK0227, and 19H03989].
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This paper was coauthored by Xiaoqi Ma, Atomu Yamaguchi, Noriaki Maeshige, Mikiko Uemura, Hikari Noguchi, Hiroyo Kondo, and Hidemi Fujino. XM, NM, and HF conceived and designed the experiments. XM, NM, and AY performed the experiments. XM, NM, HN, MU, and HF analyzed the data. NM, MU, HK, and HF contributed by providing reagents, materials, and analysis tools. XM, NM, AY, MU, HK, and HF interpreted the data and wrote the paper. All authors approved the final version of the manuscript.
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This study was approved by the Institutional Animal Care and Use Committee and was performed according to the Kobe University Animal Experimentation Regulations.
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Ma, X., Yamaguchi, A., Maeshige, N. et al. Enhancement of astaxanthin incorporation by pulsed high-intensity ultrasound in LPS-stimulated macrophages. J Med Ultrasonics 49, 125–132 (2022). https://doi.org/10.1007/s10396-022-01189-4
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DOI: https://doi.org/10.1007/s10396-022-01189-4