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Circadian rhythm does not affect the miRNA cargo of bovine raw milk extracellular vesicles

ABSTRACT: Circadian rhythm does not affect the miRNA cargo of bovine raw milk extracellular vesicles

PROVIDER: PRJNA973034 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24581000.fastq.gz	Fastqsanger.gz
	SRR24581001.fastq.gz	Fastqsanger.gz
	SRR24581002.fastq.gz	Fastqsanger.gz
	SRR24581003.fastq.gz	Fastqsanger.gz
	SRR24581004.fastq.gz	Fastqsanger.gz

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Circadian rhythm does not affect the miRNA cargo of bovine raw milk extracellular vesicles

Project description:Extracellular vesicles (EVs) and their microRNA (miRNA) cargo have been suggested as potential biomarkers for mammary gland health in cattle. However, milk is a dynamic fluid, and its biologically active components, including miRNAs, could be subject to changes throughout the day. The current study aimed to evaluate the circadian fluctuation of milk EVs miRNA cargo to assess the feasibility of milk EVs as future biomarkers for mammary gland health management. Milk from four healthy dairy cows was collected manually from one quarter during four consecutive days in the two daily milking sessions in the morning and the afternoon. The SCC was determined, and the milk EVs were isolated from skimmed milk. The presence of EVs was confirmed by transmission electron microscopy (TEM), tunable resistive pulse sensing (TRPS), and western blot (WB). Small RNA libraries were produced from 10 ng of extracted RNA and sequenced in two lanes of a HiSeq2500. The heterogeneity and integrity of EVs and the protein EV markers CD9, CD81, and TSG101 were confirmed by TEM and WB. The sequencing revealed that despite daily fluctuation in other milk components, like the somatic cells during milking sessions, the miRNA cargo abundance in milk EVs stayed constant. Our results show that the miRNA cargo of milk EVs is very stable regardless of the hour of the day, supporting their potential use as diagnostic markers for mammary gland health.

2023-07-05 | GSE232617 | GEO

Circadian Rhythm Does Not Affect the miRNA Cargo of Bovine Raw Milk Extracellular Vesicles.

Project description:Extracellular vesicles (EVs) and their microRNA (miRNA) cargo have been proposed as possible mammary gland health biomarkers in cattle. However, throughout the day, the biologically active milk components, such as miRNAs, may change due to the dynamic nature of milk. The current study aimed to evaluate the circadian fluctuation of milk EVs miRNA cargo to assess the feasibility of milk EVs as future biomarkers for mammary gland health management. Milk from four healthy dairy cows was collected for four consecutive days in the two daily milking sessions in the morning and the evening. The isolated EVs were heterogeneous, intact, and carried the EV protein markers CD9, CD81, and TSG101, as shown by transmission electron microscopy and western blot. The miRNA sequencing results demonstrate that the abundance of miRNA cargo in milk EVs remained stable, unlike other milk components, such as somatic cells, that changed during milking sessions. These findings indicated that the miRNA cargo within milk EVs remains stable irrespective of the time of day, suggesting their potential utility as diagnostic markers for mammary gland health.

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Circadian rhythm in NIH3T3 cells

Project description:Identification of cyclical expressed coding and non-coding genes during the circadian rhythm in NIH3T3 cells. NIH3T3 cells were synchronized for their circadian rhythm and RNA sequencing were performed at several time points along the rhythm. This data was used to identify cyclical expressed genes as well as long intergenic non-coding RNAs. NIH3T3 cells were synchronized with 100 nM Dexamethasone for 2 hours, then medium was changed to normal culture medium (0h). Every 4 hours cells were harvested, RNA isolated and RNAseq performed.

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Project description:Regulatory T cells (Treg cells) are important to maintain self-tolerance. In tissues, Treg cells can perform non-classical functions, for example, they are implicated in regulating metabolic processes in the adipose tissue. Their function in the liver is less well understood. We found here that Treg cells are important to secure the peripheral hepatic circadian rhythm of core-clock regulators and clock-controlled genes. Undisturbed metabolism in the liver required the presence of Treg cells and was especially important in the early postnatal phase, a distinct time period at around day 10, when the liver had not fully matured and Treg cells proliferated and accumulated in the liver-tissue. Our findings highlight a critical role for Treg cells to establish and maintain liver homeostasis.

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Project description:The circadian clock controls many aspects of physiology, but it remains undescribed whether extracellular vesicles (EVs), including exosomes, involved in cell-cell communications between tissues are regulated in a circadian pattern. We demonstrate a 24-hour rhythmic abundance of individual proteins in small EVs using liquid chromatography-mass spectrometry in circadian-synchronized tendon fibroblasts. Furthermore, the release of small EVs enriched in RNA binding proteins was temporally separated from those enriched in cytoskeletal and matrix proteins, which peaked during the end of the light phase. Last, we targeted the protein sorting mechanism in the exosome biogenesis pathway and established (by knockdown of circadian-regulated flotillin-1) that matrix metalloproteinase 14 abundance in tendon fibroblast small EVs is under flotillin-1 regulation. In conclusion, we have identified proteomic time signatures for small EVs released by tendon fibroblasts, which supports the view that the circadian clock regulates protein cargo in EVs involved in cell-cell cross-talk.

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