Why too much salt can raise blood pressure in rats
High salt intake increases blood pressure via BDNF-mediated downregulation of KCC2 and impaired baroreflex inhibition of vasopressin neurons.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
GABA — the brain’s main calming neurotransmitter — becomes excitatory under high salt conditions.
Everyone learns GABA = relaxation. This shows it can flip to cause overexcitation — like a fire alarm that starts screaming instead of warning.
Practical Takeaways
If you have high blood pressure, consider reducing salt — not just for kidneys, but to avoid potentially rewiring your brain’s pressure control system.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
GABA — the brain’s main calming neurotransmitter — becomes excitatory under high salt conditions.
Everyone learns GABA = relaxation. This shows it can flip to cause overexcitation — like a fire alarm that starts screaming instead of warning.
Practical Takeaways
If you have high blood pressure, consider reducing salt — not just for kidneys, but to avoid potentially rewiring your brain’s pressure control system.
Publication
Journal
Neuron
Year
2015
Authors
K. Choe, S. Han, Perrine Gaub, Brent Shell, D. Voisin, Blayne A. Knapp, P. Barker, C. Brown, J. Cunningham, C. Bourque, Charles Bourque@mcgill Ca
Related Content
Claims (10)
Higher dietary salt intake does not lead to sustained increases in blood pressure in healthy humans over months and years as the body self-regulates.
Too much salt makes brain cells release a signal that turns off a brake (KCC2) by activating a receptor called TrkB — but if you block that signal, the brake works again and blood pressure doesn’t rise.
If you silence the gene that makes BDNF (a brain signal molecule) in rats, even eating a lot of salt won’t break the brain’s natural brake on blood pressure — proving BDNF is the key trigger.
When rats eat too much salt for a week, their brain cells that control blood pressure stop responding to the body’s natural 'slow down' signal, because a key chloride pump gets turned down, making the signal backfire and push blood pressure higher.
When rats eat too much salt, their brain’s natural blood pressure control system flips — instead of slowing down when blood pressure rises, the neurons that release the pressure-raising hormone get even more active.