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Neuropeptide signaling and hydrocephalus: SCO with the flow
1Molecular Medicine Program, Ottawa Health Research Institute, and Department of Medicine, and Centre for Neuromuscular Disease, University of Ottawa, Ottawa, Ontario, Canada. dpicketts@ohri.ca
Insights
Congenital hydrocephalus in newborns is linked to abnormal development of key cells regulating cerebrospinal fluid (CSF) flow. Overexpression of the PACAP type I receptor gene disrupts these cells, causing hydrocephalus.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Congenital hydrocephalus affects 0.1-0.3% of live births, posing a significant mortality risk without surgical intervention.
- The molecular underpinnings of hydrocephalus and cerebrospinal fluid (CSF) circulation remain poorly understood.
- The subcommissural organ/Reissner's fiber (SCO/RF) complex and ventricular ependymal (vel) cells are crucial for CSF flow.
Discussion:
- Lang et al. identify a novel role for the pituitary adenylate cyclase-activating polypeptide (PACAP) signaling pathway in CSF circulation.
- Overexpression of the PACAP type I (PAC1) receptor gene leads to abnormal development of SCO and vel cells.
- This disruption in cell development results in congenital hydrocephalus.
Key Insights:
- The PACAP/PAC1 receptor signaling cascade is implicated in the regulation of CSF circulation.
- Abnormal SCO and vel cell development, driven by PAC1 receptor gene overexpression, is a cause of congenital hydrocephalus.
- This study sheds light on the molecular mechanisms underlying CSF homeostasis.
Outlook:
- Further research into the PACAP signaling pathway could reveal new therapeutic targets for congenital hydrocephalus.
- Understanding the precise mechanisms of SCO and vel cell development is critical for addressing hydrocephalus.
- This work opens new avenues for investigating neuropeptide regulation of brain development and fluid dynamics.
Abstract:
Congenital hydrocephalus affects 0.1-0.3% of live births, with a high mortality rate (approximately 50%) in the absence of surgical intervention. Although the insertion of shunts alleviates the symptoms of the majority of congenital cases, the molecular basis of hydrocephalus and the mechanisms of cerebrospinal fluid (CSF) circulation remain largely unknown. Two important players are the subcommissural organ/Reissner's fiber (SCO/RF) complex and the ventricular ependymal (vel) cells that together facilitate the flow of the CSF through the narrow canals of the ventricular system. In this issue of the JCI, Lang et al. demonstrate that overexpression of the pituitary adenylate cyclase-activating polypeptide (PACAP) type I (PAC1) receptor gene results in abnormal development of the SCO and vel cells, leading to congenital hydrocephalus (see the related article beginning on page 1924). The ligand for the PAC1 receptor is the neuropeptide PACAP, which uncovers what the authors believe to be a novel role for this signaling cascade in the regulation of CSF circulation.
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