Cerebrospinal fluid dynamics modulation by diet and cytokines in rats

Area of Science:

• Neurology
• Physiology
• Endocrinology

Background:

• Idiopathic intracranial hypertension (IIH) is a neurological disorder characterized by elevated cerebrospinal fluid (CSF) pressure without intracranial pathology.
• IIH primarily affects obese women aged 15-45.
• Potential mechanisms include excessive CSF production or impaired CSF drainage, with underlying molecular drivers yet to be fully elucidated.

Purpose of the Study:

• To investigate the impact of a high-fat diet on CSF secretion and drainage in rats.
• To assess the effects of specific inflammatory mediators (CCL2, IL-17, IL-6, IL-1β, TNF-α) and hydrocortisone (HC) on CSF dynamics.
• To explore potential therapeutic targets for managing CSF pressure in IIH.

Main Methods:

• Utilized in vivo ventriculo-cisternal perfusion (VCP) and variable rate infusion (VRI) techniques in Wistar rats.
• Assessed CSF secretion and drainage rates in rats fed control or high-fat diets.
• Administered inflammatory mediators and hydrocortisone to female rats to evaluate their effects on CSF dynamics.

Main Results:

• Female rats on a high-fat diet exhibited significantly increased CSF secretion compared to controls.
• Hydrocortisone treatment elevated CSF secretion in both control and high-fat fed rats.
• Tumor necrosis factor-alpha (TNF-α) increased CSF secretion in control rats only.
• C-C motif chemokine ligand 2 (CCL2) significantly increased resistance to CSF drainage in both groups, indicating reduced drainage.

Conclusions:

• Obesity and elevated inflammatory mediators may contribute to increased CSF secretion and/or impaired CSF drainage in IIH.
• Weight loss and targeted therapies (HC, TNF-α, CCL2) show potential for modulating CSF dynamics.
• These findings suggest avenues for managing intracranial pressure in obese female IIH patients.