Ovarian follicle extracellular vesicle-microRNAs mediated response of beef cows to environmental heat stress
Ontology highlight
ABSTRACT:
ORGANISM(S): Bos taurus
PROVIDER: GSE221198 | GEO | 2023/05/23
REPOSITORIES: GEO
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Project description:Ovarian follicular fluid (FF) comprises a dynamic milieu whose composition alters under seasonal variation, influencing follicle development and oocyte developmental competence. Various cell subtypes (e.g. granulosa, theca, and cumulus) produce cell-secreted nanoparticles, coined extracellular vesicles (EVs), which contain bioactive regulatory molecules such as microRNAs (miRNAs) known to mediate intrafollicular communication through various forms of signaling and information transfer. Markedly, the hallmark feature of EVs transferring cellular knowledge propagates their appealing nature as direct indicators of cellular status, albeit homeostasis, dysfunction, or disease. Photoperiod alterations influencing the regulatory content of FF-EVs as downstream modifiers remain largely unknown, particularly in seasonal breeding animals. Here, we aimed to unpack the impacts of seasonal variation on the miRNA expression profiles of FF-EVs in the mare. Equine pre-ovulatory follicles were monitored and aspirated using ultrasound-guided transvaginal techniques to obtain follicular fluids during non-breeding (spring anovulatory, SAN) and breeding seasons (spring ovulatory, SOV; summer, SUM; and fall ovulatory, FOV). 97 miRNAs were found to be differentially expressed between groups. Pairwise comparisons revealed specific clusters, including six miRNAs involved in the spring transition (miR-149-200b-206-221-328-615) and many others dysregulated during that of the summer (miR-143-192451- 302b-100, and let 7c), the peak time point for breeding. Bioinformatic analyses led to unveiling significant enrichments in various biological functions, such as transcription factor activity, transcription and transcription regulation, nucleic acid binding, sequence-specific DNA binding, p53 signaling, and post-translational modifications. Ultimately, the miRNA content of seasonally divergent FF-EVs poses as potentially relevant indicators of intrafollicular mechanisms directing seasonal transitions and their functional regulatory roles in the pre-ovulatory stage, governing subsequent ovulation.
2024-10-23 | GSE249220 | GEO
Project description:Climate change affects the duration and intensity of heat waves during summer months and jeopardizes animal health and welfare. High ambient temperatures cause heat stress in dairy cows resulting in a reduction of milk yield, feed intake, and alterations in gut barrier function. The objectives of this study were to investigate the mucosal amino acid, glucose and lactate metabolism, as well as the proteomic response of the small intestine in heat stressed (HS) Holstein dairy cows. Cows of the HS group (n = 5) were exposed for 4 days to 28°C (THI = 76) in a climate chamber. Percentage decrease in daily ad libitum intake of HS cows was calculated to provide isocaloric energy intake to pair-fed control cows kept at 15°C (THI = 60) for 4 days. The metabolite, mRNA and proteomic analyses revealed that HS induced incorrect protein folding, cellular destabilization, increased proteolytic degradation and protein kinase inhibitor activity, reduced glycolysis, and activation of NF-κB signaling, uronate cycling, pentose phosphate pathway, fatty acid and amino acid catabolism, mitochondrial respiration, ATPase activity and the antioxidative defence system. Our results highlight adaptive metabolic and immune mechanisms attempting to maintain the biological function in the small intestine of heat-stressed dairy cows.
2022-02-17 | PXD025769 | Pride
Project description:Introduction: Reduced reproductive performance due to seasonal heat stress is a major problem in the beef and dairy industries. Examining the effects of heat stress on the molecular mechanism of bovine oocytes can help to better understand their alterations on a transcriptional level and to plan and mitigate those effects. We aimed to study the response of oocytes to seasonal thermal stress. Materials and Methods: Multiparous angus dry beef cows (n = 11) were kept together during the study and subjected to synchronisation and stimulation of follicular growth using a 5-day CIDR and follicle-stimulating hormone (FSH) protocol. Ovum pick-up (OPU) was conducted on all animals in the winter (January) and summer (August). Cumulus-oocyte-complexes (COCs) were isolated from the follicular fluid aspirated during the OPU procedure. Denuded oocytes were further isolated from the COCs, snap frozen, and stored at −80 °C until further use for library sequencing, RNA sequencing, bioinformatics and gene enrichment analysis. Additionally, rectal temperatures were recorded on the day of each OPU. Environmental data were collected daily three weeks before the day of each OPU using the Florida Automated Weather Network. Statistical analysis for average rectal temperature included overall mean (average rectal temperature), treatment effects (season), and the residual. Treatment effect was considered significant at P ≤ 0.05. Data are presented as mean ± standard error of the mean. RNA was extracted from five biological replicates/pools of oocytes (each containing n = 2) followed by library preparation and sequencing (NovaSeq; Illumina). Results: As expected, environmental conditions were contrasting [average air temperature (11.5 °C vs 27.5 °C), average max air temperature (16.9 °C vs 33.7 °C), relative humidity (83.5% vs 82.3%), and temperature-humidity index (53.39 vs 79.16) for winter and summer, respectively]. Average rectal temperature was greater (P = 0.03) in summer (39.2 ± 0.2 °C) than in the winter (38.8 ± 0.2 °C). Data analysis revealed an up-regulation of 446 transcripts and a down-regulation of 940 transcripts in oocytes collected during summer compared to winter (Fold Change ≥ 2; FDR P-value ≤ 0.05). Upregulated transcripts are involved in protein digestion and absorption, ATP-binding cassette transporter, oocyte meiosis, and progesterone-mediated oocyte maturation pathways. Conversely, down-regulated transcripts are involved in pathways related to extracellular matrix-receptor interaction, focal adhesion, and PI3K-Akt signaling. Conclusions: In conclusion, exposure of cows to thermal stress can significantly alter the transcriptome of oocytes, which may negatively impact subsequent developmental competence.
2024-10-23 | GSE235170 | GEO
Project description:Investigation of cellular responses to thermal heat stress can lead to identifying novel targets of intervention to tackle the increasing fertility decline due to climate change-associated seasonal heat stress. We aimed to study the response of granulosa cells to seasonal thermal stress. Dry beef cows (n=11) were kept together during the study and subjected to synchronization and stimulation for follicular dynamics. Ovum pick-up (OPU) was conducted on all animals in the winter and summer. Once OPU-fluid settled, cumulus-oocyte-complexes (COCs) and granulosa cells were isolated from the OPU fluid and stored in a -80 freezer after snap freezing. In addition, blood samples and rectal temperature data were collected on each OPU. Environmental data were collected daily for three weeks before each OPU using the Florida Automated Weather Network. Data were analyzed using SAS. Data are presented as mean ± standard error of the mean. RNA was extracted from five pools of granulosa cells followed by library preparation and sequencing (NovaSeq; Illumina). As expected, environmental conditions were contrasting: average air temperature (11.5°C vs. 27.5°C), average max air temperature (16.9°C vs. 33.7°C), relative humidity (83.5% vs. 82.3%), and temperature-humidity index (53.39 vs. 79.16) for winter and summer, respectively. The average rectal temperature was higher (P = 0.03) in summer (39.2 ± 0.2°C) than in winter (38.8 ± 0.2°C). Of the total differentially expressed genes, granulosa cells during summer showed up and downregulation of 1083 and 1126 transcripts, respectively compared to the winter season (Fold Change ≤ -2 or ≥ 2 and FDR p-value ≤ 0.05). Many of the downregulated transcripts were found to be involved in the inhibition of immunological pathways such as activation of lymphatic system cells and activation of lymphocytes. In conclusion, exposure of cows to thermal stress can induce significant alteration in the transcriptome of granulosa cells which may have a negative impact on follicular physiology.
2024-10-23 | GSE235171 | GEO
Project description:Beef cow muscle transcriptome Evaluation of the naturally occurring transcriptome variation among beef cows with divergent gain.
2017-04-24 | GSE94777 | GEO
Project description:Beef cow adipose tissue transcriptome Evaluation of the naturally occurring transcriptome variation among beef cows with divergent gain.
2017-04-03 | GSE94746 | GEO
Project description:Heat stress (HS) has become a major challenge in the dairy industry around the world. Although numerous measures have been taken to alleviate the HS impact on milk production, the cellular level response to HS remains unclear in dairy cows. The objective of this study was to dissect functional alterations based on transcriptomic dynamics in the liver of cows under HS. Dairy cows exposed to HS exhibited both decreased feed intake and milk yield. Through liver transcriptomic analysis, differentially expressed genes were identified among three experimental conditions, including heat stress (HS), pair-fed (PF), and thermoneutral (TN) groups. We observed the upregulation of protein folding and inflammation-related genes in the HS group, while the mitochondrial genes were downregulated. Gene functional enrichment also revealed that mitochondria function and oxidative phosphorylation were dysregulated under HS. The liver transcriptome analysis generated a comprehensive gene expression regulation network upon HS in lactating dairy cows. Overall, this study provides novel insights into molecular and metabolic changes of cows conditioned under HS. Our results could facilitate the development of efficient biomarkers to mitigate the negative effect of HS on dairy cow health and productivity.
2023-08-08 | GSE226351 | GEO
Project description:To examine the difference of the endometrial conditions in the cows between on summer and autumn seasons, gene expression profiles were compared. The expressions of 268 genes were significantly higher in the endometrium collected on summer than those on autumn, whereas 369 genes were lower (P<0.05 or lower). Transcripts of GP2 and NTS were more abundant in the endometrium of summer than those of autumn (P<0.05). In contrast, the mRNA expressions of CDH1 and HSPH1 were lower in the endometrium of summer seasons (P<0.1). Collectively, the different gene expression profiles may contribute to functional differences of endometrium between the summer and autumn seasons, and GP2 and NTS may have a relevance to endometrial deficiency that cause infertility of cows on summer seasons.
2015-02-19 | GSE66057 | GEO
Project description:Context: Polycystic ovarian syndrome (PCOS), the most common endocrine disorder of reproductive- aged women, is associated with systemic low-grade inflammation. Objective: We propose that increased or altered intrafollicular inflammatory reactions also occur in periovulatory follicles of PCOS patients. Design: Gene profiling and quantitative PCR (qPCR) analyses in granulosa-lutein cells (GCs) collected from PCOS and non-PCOS women undergoing in vitro fertilization were compared with serum and follicular fluid (FF) levels of cytokines and chemokines. Setting: This was a university-based study. Patients: Twenty-one PCOS and 45 control patients were recruited: demographic, hormone, body mass index, and pregnancy outcomes were abstracted from patient data files. Interventions:GCcytokine/chemokinemRNAswere identified and analyzed by gene-chip microarrays/ qPCR before and after culture withhumanchorionic gonadotropin, DHT, IL-6, or IL-8; serum/FF cytokine levels were also analyzed. Main Outcome Measures: Relative serum/FF cytokine levels and GC cytokine expression before and after culture were compared and related to body mass index. Results: The following results were found: 1) PCOS GCs express elevated transcripts encoding cytokines, chemokines, and immune cell markers, 2) based on gene profiling and qPCR analyses, obese PCOS patients define a distinct PCOS disease subtype with the most dramatic increases in proinflammatory and immune-related factors, and 3) human chorionic gonadotropin and DHT increased cytokine production in cultured GCs, whereas cytokines augmented cytokine and vascular genes, indicating that hyperandrogenism/elevated LH and obesity in PCOS women augment intrafollicular cytokine production. Conclusions: Intrafollicular androgens and cytokines likely comprise a local regulatory loop that impacts GC expression of cytokines and chemokines and the presence of immune cells; this loop is further enhanced in the obese PCOS subtype.
2017-08-07 | GSE102293 | GEO
Project description:Many ectotherms hibernate in face of the harsh winter conditions to improve their survival rate. However, the molecular mechanism underlying this process remains unclear. Here, we collected the serum from Chinese alligtor in hinerntion season (winter) and active season (summer) and using iTRAQ to identify seasonal differently expressed proteins in Chinese alligator.
2021-09-09 | PXD019277 | Pride