Calcium-driven pathways

Calcium-driven pathways refer to the broad and complex signaling networks that utilize calcium ions (Ca2+) as a secondary messenger to regulate a vast array of cellular functions. These pathways are activated when calcium enters the cytoplasm from the extracellular environment via ion channels or is released from internal stores such as the endoplasmic reticulum (Berridge et al., 2000, Nature Reviews Molecular Cell Biology). Once elevated, cytosolic calcium binds to various sensor proteins like calmodulin, which then activate downstream effectors including kinases, phosphatases, and transcription factors (Clapham, 2007, Cell). Because calcium signaling is fundamental to processes like muscle contraction, neurotransmitter release, and cell division, its dysregulation is implicated in diverse pathologies such as heart failure, Alzheimer's disease, and malignancy (Brini et al., 2014, Reviews of Physiology, Biochemistry and Pharmacology). Therapeutic strategies do not target the "pathway" as a whole but rather specific molecular components within it, such as voltage-gated calcium channels or the calcium-sensing receptor (Catterall, 2011, Cold Spring Harbor Perspectives in Biology). Drugs like amlodipine and verapamil modulate these pathways by blocking calcium influx, while calcimimetics like cinacalcet adjust the sensitivity of calcium-sensing receptors. Due to the ubiquitous nature of calcium signaling, pharmacological intervention requires high specificity to avoid systemic toxicity and cardiac side effects. Consequently, while these pathways are critical for drug discovery, the term itself describes a biological system rather than a single druggable target.

Other names

Calcium signalingCa2+ signalingCalcium-mediated signalingCalcium homeostasis

Modulation of calcium ion flux through voltage-gated or ligand-gated channels, activation or inhibition of the calcium-sensing receptor, and antagonism of intracellular calcium release channels such as ryanodine receptors.