When human immune cells called neutrophils are placed in a solution without calcium, their electrical charge becomes less negative due to sodium entering the cell; adding calcium back restores the normal charge, showing that calcium controls this electrical behavior.
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 of all human and animal studies could determine whether calcium-dependent membrane potential changes in neutrophils are consistently observed across diverse experimental conditions and whether they correlate with functional immune outcomes.
A systematic review and meta-analysis of all peer-reviewed studies (1980–2024) measuring neutrophil membrane potential in response to calcium manipulation, including RCTs, cohort studies, and in vitro experiments, with standardized outcome measures (mV change, calcium concentration thresholds, and functional correlates like chemotaxis or ROS production).
An RCT could determine whether experimentally altering extracellular calcium in humans directly causes predictable changes in neutrophil membrane potential and downstream immune responses.
A double-blind, placebo-controlled trial in 50 healthy adults, randomized to intravenous infusion of calcium chloride (to raise serum Ca2+ by 0.5 mM) or saline, with serial measurements of neutrophil membrane potential via fluorescent dyes before, during, and after infusion, and assessment of neutrophil chemotaxis and oxidative burst as functional endpoints.
A longitudinal cohort could determine whether individuals with chronic calcium dysregulation (e.g., hypoparathyroidism) show persistent alterations in neutrophil membrane potential and impaired immune responses.
A prospective cohort study following 200 adults with chronic hypocalcemia (serum Ca2+ <8.0 mg/dL) and 200 matched controls for 2 years, measuring neutrophil membrane potential quarterly and recording incidence of bacterial infections as the primary clinical outcome.
A case-control study could determine whether patients with recurrent infections exhibit significantly different neutrophil membrane potential profiles compared to healthy controls under identical calcium conditions.
A matched case-control study comparing neutrophil membrane potential in 100 patients with recurrent bacterial infections and 100 healthy controls, all measured under identical calcium-free and calcium-repleted conditions in vitro, with adjustment for age, sex, and inflammatory markers.
A cross-sectional study could describe the distribution of neutrophil membrane potential across a population with varying calcium levels and identify potential thresholds for functional impairment.
A cross-sectional analysis of 500 healthy adults measuring serum ionized calcium and neutrophil membrane potential in a single session, stratifying by calcium quartiles and testing for nonlinear associations with potential thresholds.