{
  "id": 3483978,
  "title": "Ncbe is the main basolateral Na+ loading mechanism of the choroid plexus epithelium",
  "url": "https://urgent.news/2026/08/26/ncbe-is-the-main-basolateral-na-loading-mechanism-of-the-choroid",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-26T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.24.745951v1?rss=1"
  },
  "original_language": "en",
  "account": "The study aimed to determine the primary mechanism responsible for sodium (Na+) loading into choroid plexus epithelial cells (CPECs) as they contribute to cerebrospinal fluid (CSF) secretion, composition, and homeostasis. Researchers utilized fluorescent probes to measure intracellular Na+ levels in CPECs with access to both luminal and basolateral membranes. Upon removing extracellular Na+, the intracellular Na+ concentration decreased significantly, indicating active Na+ uptake. Recovery of intracellular Na+ to baseline levels depended on the presence of CO2 and HCO3-, a process that was partially inhibited by the NKCC1 inhibitor bumetanide and the TRPv4 inhibitor RN1734. However, inhibition by the HCO3- transport inhibitor DIDS suggested Ncbe's involvement in the Na+ recovery process. Docking studies revealed that DIDS binding to Ncbe and NBCn1 resembled that of anion exchangers, indicating a covalent-type docking. Inhibition of Ncbe in Ncbe-wt mice compared to Ncbe-ko mice further supported Ncbe as the main Na+ entry mechanism into CPECs. The findings collectively point to Ncbe as the rate-limiting step in vectorial Na+ transport driving CSF secretion.",
  "summary": "Cerebrospinal fluid (CSF) provides a specialized extracellular environment for the central nervous system, which is predominantly produced by the choroid plexus, a highly vascularized epithelial structure whose ion transport processes are fundamental to CSF secretion, composition, and homeostasis. The mechanisms of Na+ entry into choroid plexus epithelial cells (CPECs) from the interstitial side…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}