Calcium overload

Calcium overload refers to a pathological state characterized by an excessive accumulation of calcium ions within cells, which severely disrupts normal cellular function and can lead to cell death. This condition is not a specific molecular target like a receptor or enzyme, but rather a critical cellular imbalance. It plays a significant role in the pathogenesis of various diseases, including cardiovascular disorders such as arrhythmias, heart failure, and myocardial ischemia/reperfusion injury, as well as neurodegenerative diseases where it contributes to neuronal injury and death. While calcium is essential for many biological processes, its excess can trigger oxidative stress, impair ATP production, and activate destructive enzymes. Therapeutic strategies often focus on preventing or mitigating calcium overload by regulating calcium influx and efflux, or by addressing underlying causes like hyperparathyroidism. Interestingly, in cancer therapy, inducing controlled calcium overload within tumor cells is being explored as a strategy to trigger their demise.

Other names

Hypercalcemia (in blood)Calcium accumulationIntracellular calcium overloading

Calcium overload is a pathological condition, not a direct drug target. Therapeutic approaches aim to prevent or mitigate its effects. Mechanisms of action for drugs used in related conditions (like hypercalcemia) or to counteract calcium overload include: reducing calcium influx into cells; increasing calcium efflux from cells; inhibiting the Na+-K+ pump; modulating parathyroid hormone levels; inhibiting bone resorption. In cancer therapy, the mechanism involves inducing calcium overload to trigger tumor cell death.