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Transcriptomic Analysis of Postnatal Rat Carotid Body Development.

Ning Wang1, Ying-Jie Peng1, Wenjun Kang2

  • 1Institute for Integrative Physiology and Center for Systems Biology of O2 Sensing, The University of Chicago, Chicago, IL 60637, USA.

Genes
|March 28, 2024
PubMed
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Signal Transduction Pathway Mediating Carotid Body Dependent Sympathetic Activation and Hypertension by Chronic Intermittent Hypoxia.

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Neonatal carotid bodies (CBs) show heightened oxidative phosphorylation and hypoxia pathways compared to adult CBs. This developmental shift in gene expression underlies the maturation of hypoxic sensitivity in the carotid body.

Area of Science:

  • Physiology
  • Developmental Biology
  • Molecular Biology

Background:

  • The carotid body (CB) is crucial for monitoring arterial oxygen levels.
  • Neonatal CBs have immature hypoxic sensitivity that matures postnatally.
  • Understanding the molecular mechanisms of CB development is essential.

Purpose of the Study:

  • To investigate the molecular basis of postnatal carotid body development.
  • To identify gene expression changes related to hypoxic response maturation in CBs.
  • To compare gene expression profiles between neonatal and adult rat CBs.

Main Methods:

  • RNA sequencing (RNA-Seq) was performed on carotid bodies from 5-day and 21-day-old Sprague-Dawley rats.
  • Differential gene expression analysis was conducted using Edge R.
Keywords:
RNA-Seqcarotid bodyhypoxiamitochondriaoxidative phosphorylation

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  • Gene-set enrichment analysis (GSEA) was used for functional pathway enrichment.

    • Main Results:

    • 2604 differentially expressed genes (DEGs) were identified between neonatal and adult CBs.
    • Genes involved in oxidative phosphorylation and hypoxia signaling were upregulated in neonatal CBs.
    • Genes related to cytokine signaling and transcription factors (CREB, NFκB) were enriched in adult CBs.

    Conclusions:

    • Upregulation of oxidative phosphorylation and hypoxia pathways in neonatal CBs may explain their developmental hypoxic response.
    • Enrichment of cytokine and transcription factor pathways in adult CBs suggests a role in developmental regulation.
    • These findings provide insights into the molecular regulation of carotid body development and hypoxic sensing.