{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,3]],"date-time":"2026-08-03T10:10:34Z","timestamp":1785751834606,"version":"3.56.0"},"reference-count":85,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,1,6]],"date-time":"2025-01-06T00:00:00Z","timestamp":1736121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Microbiol."],"abstract":"<jats:p>Marine-derived actinobacteria isolated from sponge <jats:italic>Cliona varians<\/jats:italic> and soft coral <jats:italic>Eunicea fusca<\/jats:italic> were screened for antibacterial activity against acne-related bacteria, specifically <jats:italic>Staphylococcus epidermidis<\/jats:italic> ATCC 14990, methicillin-resistant <jats:italic>Staphylococcus aureus<\/jats:italic> ATCC BAA44, and <jats:italic>Cutibacterium acnes<\/jats:italic> ATCC 6919. Cytotoxicity assays were performed on human dermal fibroblast (HDFa) and keratinocyte (HaCaT) cell lines to assess the safety profile of the extracts. Chemical characterization was conducted using high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC\u2013MS\/MS). Among the extracts, six derived from <jats:italic>Kocuria<\/jats:italic> sp., <jats:italic>Rhodococcus<\/jats:italic> sp., <jats:italic>Nocardia<\/jats:italic> sp., <jats:italic>Micrococcus<\/jats:italic> sp., and <jats:italic>Streptomyces<\/jats:italic> sp. demonstrated significant antibacterial activity. Notably, extract Z9.216 from <jats:italic>Kocuria<\/jats:italic> sp. exhibited the highest efficacy, inhibiting <jats:italic>S. epidermidis<\/jats:italic> by 68%, <jats:italic>S. aureus<\/jats:italic> by 93%, and <jats:italic>C. acnes<\/jats:italic> by 98.7% at a concentration of 0.003\u202fmg\/mL, which was comparable to the standard antibiotics erythromycin and vancomycin, while maintaining over 90% cell viability in both HDFa and HaCaT cell lines. Untargeted metabolomic analysis suggested that antibacterial activity might be associated with compounds from the chemical families of alkaloids, terpenoids, and fatty acids, among others. These findings highlight the therapeutic potential of marine actinobacteria in underexplored environments as a promising strategy for treating acne vulgaris, a chronic inflammatory skin condition.<\/jats:p>","DOI":"10.3389\/fmicb.2024.1501951","type":"journal-article","created":{"date-parts":[[2025,1,6]],"date-time":"2025-01-06T07:03:17Z","timestamp":1736146997000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["Marine actinobacteria metabolites: unlocking new treatments for acne vulgaris"],"prefix":"10.3389","volume":"15","author":[{"given":"Mar\u00eda Clara","family":"De La Hoz-Romo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luis","family":"D\u00edaz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"G\u00f3mez-Le\u00f3n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marynes","family":"Quintero","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luisa","family":"Villamil","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2025,1,6]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"163","DOI":"10.1007\/s10126-002-0060-7","article-title":"Identification of harman as the antibiotic compound produced by a tunicate-associated bacterium","volume":"5","author":"Aassila","year":"2003","journal-title":"Mar. 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