RF Safe argues that radiofrequency radiation (especially pulsed or modulated signals with low-frequency components) can alter local membrane potentials at nanometer scales where voltage-gated ion channel S4 sensors operate. It claims these shifts could change ion channel gating in immune cells, altering calcium and proton signaling, increasing oxidative stress, and promoting innate immune activation that may contribute to autoimmune-like inflammation. The piece presents a mechanistic causal chain and highlights heart and nerve tissue as potentially more susceptible due to high ion-channel density and mitochondrial content, but does not present new study data in the provided text.

An RF Safe article argues that plasma membrane potential (Vm) is a key control variable for immune cell behavior by shaping ion driving forces, especially Ca2+ influx through CRAC channels and K+ channel–mediated hyperpolarization. It describes proposed links between Vm-regulated ion flux and downstream immune functions such as T-cell activation (NFAT/NF-κB signaling), macrophage polarization, respiratory burst capacity, and NLRP3 inflammasome activation. The piece also mentions that external electric fields can influence T-cell migration and activation markers under some conditions, but it does not present new experimental data in the excerpt provided.

This in vitro study exposed HT-1080 human fibrosarcoma cells for 4 days to weak extremely low frequency magnetic fields (10 μT, 12–33 Hz) superimposed on a 45 μT static field. The authors report frequency- and amplitude-dependent increases or decreases in cell growth, including sharp inversions near 16.5 Hz with small parameter changes or reversal of the static field direction. Associated changes in membrane potential, intracellular calcium, and mitochondrial superoxide are presented as supporting a bioenergetic mechanism.