Renal Denervation Modulates Hypothalamic Neuroinflammation via P2X7R/PI3K/Akt

Area of Science:

• Cardiovascular Research
• Neuroscience
• Renal Physiology

Background:

• Hypertension is a leading cause of cardiovascular mortality globally.
• The central neurobiological mechanisms of renal denervation (RDN) remain unclear.
• Investigating RDN's effect on the ATP/P2X7R/PI3K/Akt axis in the paraventricular nucleus.

Purpose of the Study:

• To determine if RDN modulates the ATP/P2X7R/PI3K/Akt signaling axis in the hypothalamic paraventricular nucleus.
• To investigate the role of this axis in attenuating neuroinflammation and blood pressure.
• To explore potential mechanistic targets for resistant hypertension.

Main Methods:

• Spontaneously hypertensive rats underwent sham surgery or RDN.
• Systolic blood pressure was monitored longitudinally.
• ATP levels, P2X7R expression, and PI3K/Akt phosphorylation in the paraventricular nucleus were quantified.
• A selective P2X7R antagonist was used for validation.

Main Results:

• RDN significantly reduced systolic blood pressure and cardiac target-organ injury.
• RDN decreased paraventricular nucleus ATP concentrations and downregulated P2X7R expression.
• RDN suppressed PI3K/Akt pathway activation and reduced proinflammatory cytokine production.
• P2X7R inhibition mimicked RDN's antihypertensive and anti-inflammatory effects.

Conclusions:

• RDN reduces blood pressure by attenuating central ATP-related neuroinflammatory signaling.
• The ATP/P2X7R/PI3K/Akt axis links renal signaling to central sympathetic regulation.
• This pathway is a potential mechanistic target for resistant hypertension.