{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T15:23:46Z","timestamp":1788881026580,"version":"build-2803163510"},"reference-count":59,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2022,9,15]],"date-time":"2022-09-15T00:00:00Z","timestamp":1663200000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pharmaceutics"],"abstract":"<jats:p>Cutibacterium acnes (C. acnes) is the main causative agent of acne vulgaris. The study aims to evaluate the antimicrobial activity of a natural product, Arctostaphylos uva-ursi leaf extract, against C. acnes. Preliminary chemical\u2013physical characterization of the extract was carried out by means of FT-IR, TGA and XPS analyses. Skin permeation kinetics of the extract conveyed by a toning lotion was studied in vitro by Franz diffusion cell, monitoring the permeated arbutin (as the target component of the extract) and the total phenols by HPLC and UV-visible spectrophotometry, respectively. Antimicrobial activity and time-killing assays were performed to evaluate the effects of Arctostaphylos uva-ursi leaf extract against planktonic C. acnes. The influence of different Arctostaphylos uva-ursi leaf extract concentrations on the biofilm biomass inhibition and degradation was evaluated by the crystal violet (CV) method. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) test was used to determine the viability of immortalized human keratinocytes (HaCaT) after exposure to Arctostaphylos uva-ursi leaf extract for 24 and 48 h. Levels of interleukin (IL)-1\u03b2, IL-6, IL-8 and tumour necrosis factor (TNF)-\u03b1 were quantified after HaCaT cells cotreatment with Arctostaphylos uva-ursi leaf extract and heat-killed C. acnes. The minimum inhibitory concentration (MIC) which exerted a bacteriostatic action on 90% of planktonic C. acnes (MIC90) was 0.6 mg\/mL. Furthermore, MIC and sub-MIC concentrations influenced the biofilm formation phases, recording a percentage of inhibition that exceeded 50 and 40% at 0.6 and 0.3 mg\/mL. Arctostaphylos uva-ursi leaf extract disrupted biofilm biomass of 57 and 45% at the same concentrations mentioned above. Active Arctostaphylos uva-ursi leaf extract doses did not affect the viability of HaCaT cells. On the other hand, at 1.25 and 0.6 mg\/mL, complete inhibition of the secretion of pro-inflammatory cytokines was recorded. Taken together, these results indicate that Arctostaphylos uva-ursi leaf extract could represent a natural product to counter the virulence of C. acnes, representing a new alternative therapeutic option for the treatment of acne vulgaris.<\/jats:p>","DOI":"10.3390\/pharmaceutics14091952","type":"journal-article","created":{"date-parts":[[2022,9,16]],"date-time":"2022-09-16T01:35:10Z","timestamp":1663292110000},"page":"1952","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["In Vitro Antibacterial and Anti-Inflammatory Activity of Arctostaphylos uva-ursi Leaf Extract against Cutibacterium acnes"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1654-8500","authenticated-orcid":false,"given":"Federica","family":"Dell\u2019Annunziata","sequence":"first","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3858-6214","authenticated-orcid":false,"given":"Stefania","family":"Cometa","sequence":"additional","affiliation":[{"name":"Jaber Innovation s.r.l., Via Calcutta 8, 00144 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberta","family":"Della Marca","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco","family":"Busto","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7406-9882","authenticated-orcid":false,"given":"Veronica","family":"Folliero","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3321-4331","authenticated-orcid":false,"given":"Gianluigi","family":"Franci","sequence":"additional","affiliation":[{"name":"Department of Medicine, Surgery and Dentistry \u201cScuola Medica Salernitana\u201d, University of Salerno, 84081 Baronissi, Italy"},{"name":"Clinical Pathology and Microbiology Unit, San Giovanni di Dio e Ruggi D\u2019Aragona University Hospital, 84126 Salerno, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1576-6290","authenticated-orcid":false,"given":"Massimiliano","family":"Galdiero","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9387-6201","authenticated-orcid":false,"given":"Elvira","family":"De Giglio","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Bari, Via Orabona 4, 70126 Bari, Italy"},{"name":"NSTM, National Consortium of Materials Science and Technology, Via G. Giusti 9, 50121 Florence, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0395-7962","authenticated-orcid":false,"given":"Anna","family":"De Filippis","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"13","DOI":"10.5152\/tpa.2014.1943","article-title":"Acne vulgaris","volume":"49","author":"Aydemir","year":"2014","journal-title":"Turk. Arch. Pediatrics"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"200","DOI":"10.1001\/archsurg.1990.01410140078012","article-title":"Patterns of human tumor-infiltrating lymphocytes in 120 human cancers","volume":"125","author":"Balch","year":"1990","journal-title":"Arch. 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