Subtidal macroalgal succession and competition between the annual, Sargassum horneri, and the perennials, Sargassum patens and Sargassum piluliferum, on an artificial reef in Wakasa Bay, Japan

AbstractThe present study aimed to evaluate the protective effect of a methanol extract of Sargassum horneri (SHM), which contains 6-hydroxy-4,4,7a-trimethyl-5,6,7,7a-tetrahydrobenzofuran-2(4H)-one (HTT) and apo-9′-fucoxanthinone, against ultraviolet B (UVB)-induced cellular damage in human keratinocytes and its underlying mechanism. SHM significantly improved cell viability of UVB-exposed human keratinocytes by reducing the generation of intracellular reactive oxygen species (ROS). Moreover, SHM inhibited UVB exposure-induced apoptosis by reducing the formation of apoptotic bodies and the populations of the sub-G1 hypodiploid cells and the early apoptotic cells by modulating the expression of the anti- and pro-apoptotic molecules, Bcl-2 and Bax, respectively. Furthermore, SHM inhibited NF-κB p65 activation by inducing the activation of Nrf2/HO-1 signaling. The cytoprotective and antiapoptotic activities of SHM are abolished by the inhibition of HO-1 signaling. In further study, SHM restored the skin dryness and skin barrier disruption in UVB-exposed human keratinocytes. Based to these results, our study suggests that SHM protects the cells against UVB-induced cellular damages through the Nrf2/HO-1/NF-κB p65 signaling pathway and may be potentially useful for the prevention of UVB-induced skin damage.

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Isolation and Purification of Fucoxanthin from Brown Seaweed Sargassum horneri Using Open ODS Column Chromatography and Ethanol Precipitation

Molecules ◽

10.3390/molecules26133777 ◽

2021 ◽

Vol 26 (13) ◽

pp. 3777

Author(s):

Yuemei Ye ◽

Jingwen Sun ◽

Liting Wang ◽

Junwang Zhu ◽

Wei Cui ◽

...

Keyword(s):

Column Chromatography ◽

Recovery Rate ◽

Biological Activities ◽

Brown Seaweed ◽

Sargassum Horneri ◽

Scale Production ◽

Water Mixture ◽

Isolation And Purification ◽

Ethanol Precipitation ◽

Water Solvent

As an abundant marine xanthophyll, fucoxanthin (FX) exhibits a broad range of biological activities. The preparation of high-purity FX is in great demand, however, most of the available methods require organic solvents which cannot meet the green chemistry standard. In the present study, a simple and efficient purification approach for the purification of FX from the brown seaweed Sargassum horneri was carried out. The FX-rich ethanol extract was isolated by octadecylsilyl (ODS) column chromatography using ethanol–water solvent as a gradient eluent. The overwhelming majority of FX was successfully eluted by the ethanol–water mixture (9:1, v/v), with a recovery rate of 95.36%. A parametric study was performed to optimize the aqueous ethanol precipitation process by investigating the effects on the purity and recovery of FX. Under the optimal conditions, the purity of FX was 91.07%, and the recovery rate was 74.98%. Collectively, the eco-friendly method was cost-efficient for the purification of FX. The developed method provides a potential approach for the large-scale production of fucoxanthin from the brown seaweed Sargassum horneri.

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Changes in drag and drag coefficient on small Sargassum horneri (Turner) C. Agardh individuals

Aquatic Botany ◽

10.1016/j.aquabot.2017.11.002 ◽

2018 ◽

Vol 144 ◽

pp. 61-64 ◽

Cited By ~ 8

Author(s):

Min Xu ◽

Shuji Sasa ◽

Takayoshi Otaki ◽

Fu-xiang Hu ◽

Tadashi Tokai ◽

...

Keyword(s):

Drag Coefficient ◽

Sargassum Horneri

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Phylogeographic heterogeneity of the brown macroalga Sargassum horneri (Fucaceae) in the northwestern Pacific in relation to late Pleistocene glaciation and tectonic configurations

Molecular Ecology ◽

10.1111/j.1365-294x.2011.05220.x ◽

2011 ◽

Vol 20 (18) ◽

pp. 3894-3909 ◽

Cited By ~ 73

Author(s):

ZI-MIN HU ◽

SHINYA UWAI ◽

SHEN-HUI YU ◽

TERUHISA KOMATSU ◽

TETSURO AJISAKA ◽

...

Keyword(s):

Late Pleistocene ◽

Sargassum Horneri ◽

Northwestern Pacific ◽

Pleistocene Glaciation ◽

Brown Macroalga

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Sediment transport modifications induced by submerged artificial reef systems: a case study for the Gulf of Venice

Oceanological and Hydrobiological Studies ◽

10.2478/s13545-014-0112-4 ◽

2014 ◽

Vol 43 (1) ◽

Cited By ~ 3

Author(s):

Davide Bonaldo ◽

Alvise Benetazzo ◽

Andrea Bergamasco ◽

Francesco Falcieri ◽

Sandro Carniel ◽

...

Keyword(s):

Sediment Transport ◽

Coastal Zone Management ◽

Artificial Reef ◽

Sediment Concentration ◽

Quantitative Information ◽

Small Scale ◽

Zone Management ◽

Basin Scale ◽

Scale Modelling ◽

Maritime Spatial Planning

AbstractThe shallow, gently sloping, sandy-silty seabed of the Venetian coast (Italy) is studded by a number of outcropping rocky systems of different size encouraging the development of peculiar zoobenthic biocenoses with considerably higher biodiversity indexes compared to neighbouring areas. In order to protect and enhance the growth of settling communities, artificial monolithic reefs were deployed close to the most important formations, providing further nesting sites and mechanical hindrance to illegal trawl fishing.In this framework, a multi-step and multi-scale numerical modelling activity was carried out to predict the perturbations induced by the presence of artificial structures on sediment transport over the outcroppings and their implications on turbidity and water quality. After having characterized wave and current circulation climate at the sub-basin scale over a reference year, a set of small scale simulations was carried out to describe the effects of a single monolith under different geometries and hydrodynamic forcings, encompassing the conditions likely occurring at the study sites. A dedicated tool was then developed to compose the information contained in the small-scale database into realistic deployment configurations, and applied in four protected outcroppings identified as test sites. With reference to these cases, under current meteomarine climate the application highlighted a small and localised increase in suspended sediment concentration, suggesting that the implemented deployment strategy is not likely to produce harmful effects on turbidity close to the outcroppings.In a broader context, the activity is oriented at the tuning of a flexible instrument for supporting the decision-making process in benthic environments of outstanding environmental relevance, especially in the Integrated Coastal Zone Management or Maritime Spatial Planning applications. The dissemination of sub-basin scale modelling results via the THREDDS Data Server, together with an user-friendly software for composing single-monolith runs and a graphical interface for exploring the available data, significantly improves the quantitative information collection and sharing among scientists, stakeholders and policy-makers.

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