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ABSTRACT: Microorganisms on microplastic surfaces and in sediments

PROVIDER: PRJNA1018339 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26086500_1.fastq.gz	Fastqsanger.gz
	SRR26086500_2.fastq.gz	Fastqsanger.gz
	SRR26086501_1.fastq.gz	Fastqsanger.gz
	SRR26086501_2.fastq.gz	Fastqsanger.gz
	SRR26086502_1.fastq.gz	Fastqsanger.gz

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Project description:Rationale Microplastics are a pressing global concern and inhalation of microplastic fibers has been associated with interstitial and bronchial inflammation in flock workers. However, how microplastic fibers affect the lungs is unknown. Objectives Our aim was to assess the effects of 12x31 µm nylon 6,6 (nylon) and 15x52 µm polyethylene terephthalate (polyester) textile microplastic fibers on lung epithelial growth and differentiation. Methods We used human and murine alveolar and airway-type organoids as well as air-liquid interface cultures derived from primary lung epithelial progenitor cells and incubated these with either nylon or polyester fibers or nylon leachate. In addition, mice received one dose of nylon fibers or nylon leachate and 7 days later organoid-forming capacity of isolated epithelial cells was investigated. Results We observed that nylon microfibers, more than polyester, inhibited developing airway organoids and not established ones. This effect was mediated by components leaching from nylon. Epithelial cells isolated from mice exposed to nylon fibers or leachate, also formed fewer airway organoids, suggesting long-lasting effects of nylon components on epithelial cells. Part of these effects were recapitulated in human air-liquid interface cultures. Transcriptome analysis revealed upregulation of Hoxa5 post-exposure to nylon fibers. Inhibiting Hoxa5 protein during nylon exposure restored airway organoid formation, confirming Hoxa5's pivotal role in the effects of nylon. Conclusions These results suggest that components leaching from nylon 6,6 may especially harm developing airways and/or airways undergoing repair and we strongly encourage to characterize both hazard of and exposure to microplastic fibers in more detail.

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Functional genomic analyses of Bifidobacterium bifidum PRL2010 highlight how this microorganism interact with the human host

Project description:Bifidobacteria represents one of the dominant group of microorganisms colonizing the intestine of infants. However, the genetic determinants supporting the establishment and the interaction with the human hosts are still largely unknown. Most commensal bacteria interacting with eukaryotic hosts express adhesive molecules on their surfaces that modulate interaction with host cell receptors or with soluble macromolecules. Whole genome transcription profiling of B. bifidum PRL2010, a strain isolated from infant stool, under in vitro as well as in vivo conditions revealed the expression of few common extracellular proteins among which type 1 pili encoding genes.

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