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Half-lives of PAHs and temporal microbiota changes in commonly used urban landscaping materials.

ABSTRACT: Background:Polycyclic aromatic hydrocarbons (PAHs) accumulate in urban soils, and PAH contamination can change soil microbial community composition. Environmental microbiota is associated with human commensal microbiota, immune system and health. Therefore, studies investigating the degradation of PAHs, and the consequences of soil pollution on microbial communities in urban landscaping materials, are crucial. Methods:Four landscaping materials (organic matter 1, 2, 13 and 56%) were contaminated with PAHs commonly found at urban sites (phenanthrene, fluoranthene, pyrene, chrysene and benzo(b)fluoranthene) in PAH concentrations that reflect urban soils in Finland (2.4 µg g -1 soil dry weight). PAHs were analyzed initially and after 2, 4, 8 and 12 weeks by gas chromatography-mass spectrometry. Half-lives of PAHs were determined based on 12-weeks degradation. Bacterial communities were analyzed at 1 and 12 weeks after contamination using Illumina MiSeq 16S rRNA gene metabarcoding. Results:Half-lives ranged from 1.5 to 4.4 weeks for PAHs with relatively low molecular weights (phenanthrene, fluoranthene and pyrene) in landscaping materials containing 1-2% organic matter. In contrast, in materials containing 13% and 56% organic matter, the half-lives ranged from 2.5 to 52 weeks. Shorter half-lives of phenanthrene and fluoranthene were thus associated with low organic matter content. The half-life of pyrene was inversely related to the relative abundance of Beta-, Delta- and Gammaproteobacteria, and diversity of Bacteroidetes and Betaprotebacteria. Compounds with higher molecular weights followed compound-specific patterns. Benzo(b)fluoranthene was resistant to degradation and half-life of chrysene was shorter when the relative abundance of Betaproteobacteria was high. Temporal microbiota changes involved increase in the relative abundance of Deltaproteobacteria and decrease in genera Flavobacterium and Rhodanobacter. Exposure to PAHs seems to adjust microbial community composition, particularly within class Beta- and Deltaproteobacteria. Conclusions:In this study, PAH degradation depended on the organic matter content and bacterial community composition of landscaping materials. Contamination seems to alter bacterial community composition in landscaping materials depending on material type. This alteration includes changes in bacterial phyla associated with human health and immune system. This may open new possibilities for managing urban environments by careful selection of landscaping materials, to benefit health and wellbeing.

SUBMITTER: Roslund MI

PROVIDER: S-EPMC5863720 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Half-lives of PAHs and temporal microbiota changes in commonly used urban landscaping materials.

Roslund Marja I MI Grönroos Mira M Rantalainen Anna-Lea AL Jumpponen Ari A Romantschuk Martin M Parajuli Anirudra A Hyöty Heikki H Laitinen Olli O Sinkkonen Aki A

PeerJ 20180319

<h4>Background</h4>Polycyclic aromatic hydrocarbons (PAHs) accumulate in urban soils, and PAH contamination can change soil microbial community composition. Environmental microbiota is associated with human commensal microbiota, immune system and health. Therefore, studies investigating the degradation of PAHs, and the consequences of soil pollution on microbial communities in urban landscaping materials, are crucial.<h4>Methods</h4>Four landscaping materials (organic matter 1, 2, 13 and 56%) we ...[more]

PMID: 29576975

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Project description:Human activities typically lead to simplified urban diversity, which in turn reduces microbial exposure and increases the risk to urban dwellers from non-communicable diseases. To overcome this, we developed a microbial inoculant from forest and agricultural materials that resembles microbiota in organic soils. Three different sand materials (sieved, safety, and sandbox) commonly used in playgrounds and other public spaces were enriched with 5% of the inoculant. Skin microbiota on fingers (identified from bacterial 16S rDNA determined using Illumina MiSeq sequencing) was compared after touching non-enriched and microbial inoculant-enriched sands. Exposure to the non-enriched materials changed the skin bacterial community composition in distinct ways. When the inoculant was added to the materials, the overall shift in community composition was larger and the differences between different sand materials almost disappeared. Inoculant-enriched sand materials increased bacterial diversity and richness but did not affect evenness at the OTU level on skin. The Firmicutes/Bacteroidetes ratio was higher after touching inoculant-enriched compared to non-enriched sand materials. The relative abundance of opportunistic pathogens on skin was 40-50% before touching sand materials, but dropped to 14 and 4% after touching standard and inoculant-enriched sand materials, respectively. When individual genera were analyzed, Pseudomonas sp. and Sphingomonas sp. were more abundant after touching standard, non-enriched sand materials, while only the relative abundance of Chryseobacterium sp. increased after touching the inoculant-enriched materials. As Chryseobacterium is harmless for healthy persons, and as standard landscaping materials and normal skin contain genera that include severe pathogens, the inoculant-enriched materials can be considered safe. Microbial inoculants could be specifically created to increase the proportion of non-pathogenic bacterial taxa and minimize the transfer of pathogenic taxa. We recommend further study into the usability of inoculant-enriched materials and their effects on the bacterial community composition of human skin and on the immune response.

Project description:ObjectivesThe study aimed at identifying the commonly used non-prescribed antibiotics (NPAs) and the main health conditions leading to the practices of self-medication with antibiotics (SMAs) in Maputo city, Mozambique.DesignCross-sectional qualitative study based on individual and group interviews.SettingThe study was conducted in nine pharmacies of three socioeconomic areas of Maputo city, from October 2018 to March 2019.ParticipantsThe study included 32 pharmacy clients and 17 pharmacists. The pharmacy clients included men 10 (31%) and women 22 (69%) ranging from 19 to 67 years while the pharmacists included men 6 (35,3%) and women 11 (64,7%) with ages ranging from 24 to 47 years.FindingsThe majority of the pharmacy clients 30 (93.75%) admitted frequent use of NPAs, 15 (88.2%) out of the 17 pharmacists admitted dispensing NPAs. While the majority of the participants (16) mentioned the use of amoxicillin, also known as 'two colours medicine', 14 mentioned the use of cotrimoxazole and seven mentioned amoxicillin with clavulanic acid. Two to five participants also used tetracycline, ciprofloxacin, azithromycin, doxycycline, erythromycin, metronidazole and phenoxymethylpenicillin. The above mentioned NPAs were used to treat self-perceived sore throat, fever, pain, cough, vaginal discharge, eye problems, the common influenza, urinary infections, respiratory tract infections, wounds and toothaches.ConclusionsAntibiotics are perceived as essential medical resources to manage health and illnesses. While taking an active role in their health-disease process, participants commonly used amoxicillin, 'two colours', cotrimoxazole and amoxicillin with clavulanic acid to manage their health and that of their families. In this sense, the practices of SMAs were perceived as part of the self-care process and not necessarily as misuse of antibiotics. A wideunderstanding of health-seeking beliefs and behaviours regarding the utilisation of antibiotics is needed to inform public health experts, health policymakers and other stake-holders in designing and implementing public health education and health promotion programsat all levels in Mozambique.

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Half-lives of PAHs and temporal microbiota changes in commonly used urban landscaping materials.

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Half-lives of PAHs and temporal microbiota changes in commonly used urban landscaping materials.

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