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Assessment of the photoprotective potential and structural characterization of secondary metabolites of Antarctic fungus Arthrinium sp.

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Abstract

Interest in Antarctic fungi has grown due to their resilience in harsh environments, suggesting the presence of valuable compounds from its organisms, such as those presenting photoprotective potential, since this environment suffers the most dangerous UV exposure in the world. Therefore, this research aimed to assess the photoprotective potential of compounds from sustainable marine sources, specifically seaweed-derived fungi from Antarctic continent. These studies led to discovery of photoprotective and antioxidant properties of metabolites from Arthrinium sp., an endophytic fungus from Antarctic brown algae Phaeurus antarcticus. From crude extract, fractions A-I were obtained and compounds 1–6 isolated from E and F fractions, namely 3-Hydroxybenzyl alcohol (1), (-)-orthosporin (2), norlichexanthone (3), anomalin B (4), anomalin A (5), and agonodepside B (6). Compounds 1, 2, and 6 were not previously reported in Arthrinium. Fraction F demonstrated excellent absorbance in both UVA and UVB regions, while compound 6 exhibited lower UVB absorbance, possibly due to synergistic effects. Fraction F and compound 6 displayed photostability and were non-phototoxic to HaCaT cells. They also exhibited antioxidant activity by reducing intracellular ROS production induced by UVA in keratinocyte monolayers and reconstructed human skin models (resulting in 34.6% and 30.2% fluorescence reduction) and did not show irritation potential in HET-CAM assay. Thus, both are promising candidates for use in sunscreens. It is noted that Fraction F does not require further purification, making it advantageous, although clinical studies are necessary to confirm its potential applicability for sunscreen formulations.

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Acknowledgements

The authors are thankful to University of São Paulo for providing access to necessary resources, the financial and fellowship support from the Brazilian research funding agencies Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Conselho Nacional de desenvolvimento Científico e Tecnológico (CNPq). The Department of Biomolecular Sciences and the Núcleo de Pesquisas em Produtos Naturais e Sintéticos–NPPNS are acknowledged. In the final review of the manuscript, the authors utilized an AI-powered language model known as CHAT-GPT for assistance, primarily focusing on English grammar, vocabulary, and minor content review.

Funding

This study had financial and logistic support from the Brazilian Antarctic Program PROANTAR/MCTI/CNPq N°64/2013), Brazilian Marine Force, National Institute of Science and Technology (INCT:BioNat), Grant #465637/2014-0, and the State of São Paulo Research Foundation (FAPESP), Grant #2014/50926-0 and 2017/03552-5.

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Contributions

ACJ: Conceptualization, Methodology, Formal analysis, Investigation, Data Curation, Writing—Original Draft, Review and Editing, Visualization GSS, TRT, AJPG, CBSA, LT and KCP: Methodology, Formal analysis, Data Curation, Review and Editing MRZK: Conceptualization, Resources, Supervision LRG: Conceptualization, Resources, Supervision, Review and Editing, Project Administration PC: Resources, Project administration, Funding Acquisition HMD: Conceptualization, Resources, Review and Editing, Supervision, Project administration, Funding acquisition.

Corresponding author

Correspondence to Hosana Maria Debonsi.

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The authors declare no conflict of interest.

Ethics approval

All experimental procedures involving humans were performed in accordance with the principles of the Declaration of Helsinki and were approved by the Human Research Ethics Committee of School of Pharmaceutical Sciences of Ribeirão Preto, São Paulo, Brazil (CAAE number 31758619.5.0000.5403). The written informed consent was signed by all the donors or their parents or legal guardian.

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Communicated by Yusuf Akhter.

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Jordão, A.C., dos Santos, G.S., Teixeira, T.R. et al. Assessment of the photoprotective potential and structural characterization of secondary metabolites of Antarctic fungus Arthrinium sp.. Arch Microbiol 206, 35 (2024). https://doi.org/10.1007/s00203-023-03756-w

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  • DOI: https://doi.org/10.1007/s00203-023-03756-w

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