Biphasic functional regulation in hippocampus of rat with chronic cerebral hypoperfusion induced by permanent occlusion of bilateral common carotid artery
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ABSTRACT:
ORGANISM(S): Rattus norvegicus
SUBMITTER: Bu-Yeo Kim
PROVIDER: E-GEOD-44289 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:We measured temporal changes of gene expression in hippocampus of rat after BCCAo using time-course microarray analysis
2013-02-14 | GSE44289 | GEO
Project description:BackgroundChronic cerebral hypoperfusion induced by permanent occlusion of the bilateral common carotid artery (BCCAO) in rats has been commonly used for the study of Alzheimer's disease and vascular dementia. Despite the apparent cognitive dysfunction in rats with BCCAO, the molecular markers or pathways involved in the pathological alternation have not been clearly identified.MethodsTemporal changes (sham, 21, 35, 45, 55 and 70 days) in gene expression in the hippocampus of rats after BCCAO were measured using time-course microarray analysis. Gene Ontology (GO) and pathway analyses were performed to identify the functional involvement of temporally regulated genes in BCCAO.ResultsTwo major gene expression patterns were observed in the hippocampus of rats after BCCAO. One pattern, which was composed of 341 early up-regulated genes after the surgical procedure, was dominantly involved in immune-related biological functions (false discovery rate [FDR]<0.01). Another pattern composed of 182 temporally delayed down-regulated genes was involved in sensory perception such as olfactory and cognition functions (FDR<0.01). In addition to the two gene expression patterns, the temporal change of GO and the pathway activities using all differentially expressed genes also confirmed that an immune response was the main early change, whereas sensory functions were delayed responses. Moreover, we identified FADD and SOCS3 as possible core genes in the sensory function loss process using text-based mining and interaction network analysis.ConclusionsThe biphasic regulatory mechanism first reported here could provide molecular evidence of BCCAO-induced impaired memory in rats as well as mechanism of the development of vascular dementia.
| S-EPMC3728362 | biostudies-literature
Project description:To ameliorate the cumbersome processes of reprogramming and subsequent gene-editing in vulnerable iPSCs, we have developed a greatly simplified one-step procedure, simultaneously introducing reprogramming and gene-editing components into human fibroblast cells. This not only serves to save time, labor, and costs, but opens up a new arena of research that is beyond the current application of gene-editing methodologies due to restrictive reprogramming concerns, inhibitory pluripotency maintenance requirements, and vulnerability of single-cell dissociated iPSCs. We generated iPSCs (mALK2-iPSCs) derived from Fibrodysplasia ossificans progressiva (FOP)-fibroblast cells carrying the ACVR1 p.R206H mutation and gene-corrected ALK2-iPSCs (cALK2-iPSCs). To identify gene-correction effects on global gene expression, gene expression profiling was measured in cALK2-iPSCs and mALK2-iPSCs, calibrated to WT-iPSCs with duplication.
2015-05-12 | E-GEOD-68766 | biostudies-arrayexpress
Project description:Comparison of time-series gene expression pattern in hippocampus of hypoxia tolerant or sensitive rats. At 12 time-points ({0h, 1h, 3h, 12h, 24h, 48h} x 2) after ischemia operation, microdissected CA1 regions of the two groups were respectively subjected to oligonucleotide-based microarray analysis. MIAME information can be obtained at the web link.
2007-10-30 | E-GEOD-1357 | biostudies-arrayexpress
Project description:This study was designed to identify molecular changes induced by radiation in mouse lung. Mouse left lung was irradiated with a single dose of radiation. Total RNA from the irradiated lung tissue was subject to single channnel microarray.
2014-08-21 | E-GEOD-60541 | biostudies-arrayexpress
Project description:Animal models provide opportunity to study neurobiological aspects of human alcoholism. Changes in gene expression have been implicated in mediating brain function, including reward system and addiction. The current study aimed to identify novel genes that may underlie ethanol preference. Microarray analysis comparing gene expression in nucleus accumbens (NAc), hippocampus (HP) and prefrontal medial cortex (mPFC) was performed in two rat strains selected for extreme levels of ethanol preference - Warsaw High Preferring (WHP) and Warsaw Low Preferring (WLP). The identified candidate genes may underlie differential ethanol preference in rat model of alcoholism. This is analysis of 18 RNA samples, including 9 technical replicates. Two strains of rats selected for extreme levels of ethanol preference (low preferring WLP and high preferring WHP) were compared. Three brain areas (nucleus accumbens, prefrontal medial cortex and hippocampus) were studied. For each brain area, 6 RNA samples (including 3 technical replicates) were analyzed. Each RNA sample consist of of equal amounts of total RNA from 3 male rats. Comparisons: Nucleus accumbens of WHP vs. Nucleus accumbens of WLP; Prefrontal medial cortex of WHP vs. Prefrontal medial cortex of WLP; Hippocampus of WHP vs. Hippocampus of WLP. 3 biological replicates in each comparison.
2015-01-17 | E-GEOD-65064 | biostudies-arrayexpress
Project description:Purpose of reviewA novel permanent carotid filter device for percutaneous implantation was developed for the purpose of stroke prevention. In this review, we cover rationale, existing preclinical and clinical data, and potential future directions for research using such a device.Recent findingsThe Vine™ filter was assessed for safety in sheep and in 2 observational human studies, the completed CAPTURE 1 (n = 25) and the ongoing CAPTURE 2 (planned n = 100). CAPTURE 1 has shown high procedural and long-term implant safety. A control group was not available for comparison. A mechanical filter for permanent stroke prevention can be implanted bilaterally in the common carotid artery safely and efficiently. A randomized trial is planned for 2021 (n = 3500, INTERCEPT) to demonstrate superiority of a filter + anticoagulation strategy over anticoagulation alone in patients at high risk for ischemic stroke.
| S-EPMC7496024 | biostudies-literature
Project description:The pathophysiology of stroke is governed by immune reactions within and remote from the injured brain. Hypertension, a major cause and comorbidity of stroke, entails systemic vascular inflammation and may influence poststroke immune responses. This aspect is, however, underestimated in previous studies. Here we aimed to delineate the sequence of cellular inflammation after stroke in spontaneously hypertensive (SH) rats. Spontaneously hypertensive rats were subjected to permanent middle cerebral artery occlusion and killed after 1 or 4 days. Immune cells of the peripheral blood and those which have infiltrated the injured brain were identified and quantified by flow cytometry. The spatial distribution of myeloid cells and T lymphocytes, and the infarct volume were assessed by histology. We observed a concerted infiltration of immune cells into the ischemic brain of SH rats. At day 1, primarily neutrophils, monocytes, macrophages, and myeloid dendritic cells entered the brain, whereas the situation at day 4 was dominated by microglia, macrophages, lymphatic dendritic cells, and T cells. Postischemic inflammation did not cause secondary tissue damage during the subacute stage of experimental stroke in SH rats. Considering the intrinsic vascular pathology of SH rats, our study validates this strain for further translational research in poststroke inflammation.
| S-EPMC3915208 | biostudies-literature
Project description:PurposeRecognize a rare yet existing risk of severe visual loss as a postoperative complication of bilateral lung transplant.ObservationsA 62-year-old male had undergone bilateral lung transplant for end-stage idiopathic pulmonary fibrosis and emphysema overlap syndrome. The operation was initially off-pump; however, during the left lung transplantation, cardiopulmonary bypass conversion was necessary to maintain intraoperative hemodynamic stability. On post-operative day 4, shortly after extubation and full recovery from sedation, the patient reported bilateral no light perception vision. There were no other associated neurologic symptoms. A computed tomographic (CT) of the head, cranial magnetic resonance (MR) scan of the head, MR angiogram of the circle of Willis and neck were negative. Neuro-ophthalmologic examination revealed no light perception vision in both eyes(OU). The pupils were non-reactive to light (amaurotic pupils). The intraocular pressure measured 18 mm Hg OU, and complete bilateral ophthalmoplegia was present. The fundus exam showed bilateral pallid optic disc edema, cherry red spots, with arteriolar attenuation, and mildly dilated and tortuous veins. Stroke work up was negative.Conclusions and importanceA case of post-operative visual loss and ophthalmoplegia carrying significant and permanent quality of life implications. It questions the role disruption of homeostasis during cardiopulmonary bypass contributes for this outcome.
| S-EPMC6880121 | biostudies-literature
Project description:PurposeTo report on a severe case of presumed giant cell arteritis (GCA) presenting with partial and complete ophthalmic artery occlusion along with bilateral central retinal vein occlusions (CRVO).ObservationsA 73-year-old female presented with bilateral complete vision loss of sudden onset. The patient also experienced a mild frontal headache prior to onset of vision loss. Fundus examination revealed bilateral central retinal artery occlusion (CRAO) and CRVO. Subsequent fluorescein angiography indicated partial right ophthalmic artery occlusion and complete left ophthalmic artery occlusion. Acute phase reactants were elevated. The patient was clinically diagnosed with GCA and intravenous (IV) steroids were initiated. Four days later, a temporal artery biopsy (TAB) was performed and resulted as negative for granulomatous inflammation. The patient did not regain vision and remained with no light perception (NLP) in both eyes.Conclusionsand Importance: This case highlights the discrepancy between clinical diagnosis and pathologic tissue diagnosis in a patient that presented with such extensive ocular vasculitic disease. Such extensive bilateral disease has not been reported. In addition, there are few studies regarding the effect of pulse-dosed IV steroids on TAB results. This case report suggests that the gradual histologic changes that occur over one or two weeks while on oral steroids may occur over three to four days while on high dose IV steroids, necessitating early biopsy.
| S-EPMC6105759 | biostudies-literature