Antifouling biocide zinc pyrithione (ZnPT) and its biological fate have received little attention because this compound was assumed not to be persistent in marine ecosystems. An analytical procedure was developed that has proved to be efficient and very sensitive in extracting ZnPT and its main secondary products, Zn and ionized pyrithione (PT(-)), from both seawater and biological samples, namely in the gills and digestive gland of the bioindicator species Mytilus galloprovincialis. Short-term experiments were carried out to investigate ZnPT toxicity and bioaccumulation. The effects on survival and tissue bioaccumulation of ZnPT and its secondary products were studied on adult mussels from a natural population, collected in the harbor area of Porto Santo Stefano (Italy) and exposed to sublethal doses of the biocide for up to 7 d. Zinc pyrithione was shown to be persistent in the experimental seawater in the short term. A basal level of ZnPT and ionized PT(-) was detected in the mussels, indicating that ZnPT availability in the sampling site is already high enough to induce a detectable accumulation in individuals of the native population. Zinc pyrithione rapidly accumulated in the tissues of the exposed mussels, proportionately to both exposure concentration and time, identifying the gills and digestive gland as important targets in the biological pathway of the contaminants. Even though the 7-d median lethal concentration (LC50) = 8.27 µM established here appears high with respect to reported ZnPT environmental concentrations, the results indicate that this biocide could represent a threat for marine organisms in coastal environments and that further investigations on its biological effects at sublethal doses are needed.
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http://dx.doi.org/10.1002/etc.316 | DOI Listing |
Int J Cosmet Sci
January 2025
Unilever Research and Development Port Sunlight Laboratory, Wirral, UK.
Objective: Dandruff is a common scalp condition characterized by the chronic shedding of large clumps of epidermal cells. Alongside negative physical symptoms, dandruff is thought to have a detrimental impact on individuals' mental health. The aim of this study was to determine whether the clinical benefits of using an anti-dandruff shampoo (ADS) will result in improved psychological wellbeing in individuals suffering from dandruff.
View Article and Find Full Text PDFOncogene
January 2025
State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-sen University Cancer Center, Guangzhou, China.
Mismatch repair deficiency (dMMR) cancers are highly sensitive to immunotherapy, but only account for a small fraction of cancer patients. How to increase immunotherapy efficacy on MMR-proficient (pMMR) cancer is still a major challenge. This study demonstrates that pyrithione zinc (PYZ), an FDA-approved drug, can enhance tumor immunogenicity via altering MMR and activating STING signaling.
View Article and Find Full Text PDFJ Cosmet Dermatol
January 2025
Department of Dermatology, Nanfang Hospital, Southern Medical University, Guangzhou, China.
Background: The occurrence of scalp seborrheic dermatitis (SD) is closely related to the production of sebum and scalp barrier function. Supramolecular salicylic acid has the keratolytic and anti-inflammatory properties, and zinc pyrithione is an antifungal drug delivered as a microparticle to skin epithelia.
Objective: This study aimed to assess the efficacy and safety of 2% supramolecular salicylic acid (SSA) combined with 0.
Cureus
September 2024
Savlon Swasth India Mission, ITC Life Sciences and Technology Centre, Bangalore, IND.
Background: Seborrheic dermatitis is a common scalp condition affecting the quality of life of individuals across all age groups. The uninhibited proliferation of and enhanced sebaceous gland activity often leads to scalp flaking, mild erythema, and itching, thereby worsening the situation. Here, we aimed to study the efficacy of an antiseptic liquid as a pre-shampoo rinse followed by a non-anti-dandruff shampoo as a dandruff care strategy.
View Article and Find Full Text PDFLife Sci
December 2024
Department of Pharmacology, School of Pharmacy, Qingdao University Medical College, #1 Ningde Road, Qingdao 266073, China. Electronic address:
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