The flow of sodium into human neutrophils that causes depolarization is stopped by calcium and similar ions, but not by barium, showing that the pathway allowing sodium in responds specifically to certain types of ions.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
A systematic review could determine whether the selective blockade of sodium influx by divalent cations (but not barium) is a consistent feature across human and animal neutrophil studies.
A systematic review and meta-analysis of all studies (1970–2024) testing the effect of calcium, magnesium, strontium, barium, and other divalent cations on neutrophil sodium currents, with standardized protocols and effect size comparisons.
An RCT could determine whether selective application of barium versus calcium produces statistically different sodium current magnitudes in human neutrophils.
A double-blind, crossover RCT in 20 healthy adults, where isolated neutrophils are exposed to barium chloride (5 mM), calcium chloride (2 mM), or control solution in randomized order, with sodium current measured via patch-clamp electrophysiology.
A cohort study could determine whether individuals with inherited disorders of divalent cation metabolism show altered sensitivity of neutrophil sodium influx to calcium or barium.
A prospective cohort of 100 individuals with hypocalcemia, hypermagnesemia, or barium toxicity and 100 matched controls, measuring neutrophil sodium influx under controlled ionic conditions and correlating with serum ion levels.
A case-control study could determine whether neutrophils from patients with immune dysfunction show abnormal sensitivity to barium or calcium blockade of sodium influx.
A matched case-control study comparing sodium current blockade by calcium and barium in 60 patients with chronic granulomatous disease and 60 healthy controls, using standardized electrophysiological protocols.
A cross-sectional study could describe the variability in sodium current sensitivity to barium and calcium across a healthy population.
A cross-sectional analysis of 350 healthy adults measuring the degree of sodium current inhibition by 2 mM calcium and 5 mM barium in isolated neutrophils, stratifying by age, sex, and baseline electrolytes.