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Transcriptome analysis of young and old zebrafish ventricles

ABSTRACT: Transcriptome analysis of young and old zebrafish ventricles

PROVIDER: PRJNA758577 | ENA |

REPOSITORIES: ENA

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Transcriptome analysis of young and old zebrafish ventricles

Project description:The gradual decline of tissue functionality is the main reason why humans suffer from age-related diseases. The prevalence for cardiovascular diseases increases with increasing age. In order to prevent age-related cardiac diseases, it is of importance to understand the respective age-associated risk factors. We have therefore compared the ventricular transcriptome of old and young hearts of the model organism zebrafish. We identified the immune system as activated in the old and found muscle organization to deteriorate upon aging. We show an accumulation of immune cells, mostly macrophages, in the old zebrafish ventricle.

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Expression data from young and old zebrafish brain.

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Project description:The choroid plexus produces cerebrospinal fluid (CSF) by transport of electrolytes and water from the vasculature to the brain ventricles. The choroid plexus plays additional roles in brain development and homeostasis by secreting neurotrophic molecules, and by serving as a CSF-blood barrier and immune interface. Prior studies have identified transporters on the epithelial cells that transport water and ions into the ventricles and tight junctions involved in the CSF-blood barrier. Yet, how the choroid plexus epithelial cells maintain the brain ventricle system and control brain physiology remain unresolved. To provide novel insights into the physiological roles of the choroid plexus, we use juvenile and adult zebrafish as model systems. Upon histological and transcriptomic analyses, we first identified that the zebrafish choroid plexus is highly conserved with the mammalian choroid plexus and that it expresses all transporters necessary for CSF secretion. Using novel genetic lines, we also identified that the choroid plexus secretes proteins into the CSF. Next, we generated a transgenic line allowing us to ablate specifically the epithelial cells in the choroid plexus. Using the ablation system, we identified a reduction of the ventricular sizes, but no alterations of the CSF-blood barrier. Altogether, our findings identified that the zebrafish choroid plexus is evolutionarily conserved and critical for maintaining the size and homeostasis of the brain ventricles.

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