Calcium influx pathways

Calcium influx pathways represent a complex network of mechanisms responsible for the entry of calcium ions (Ca2+) into the cytoplasm, a process vital for cellular signaling (Berridge et al., 2000, Nature Reviews Molecular Cell Biology). These pathways include voltage-gated calcium channels (VGCCs), which respond to membrane depolarization, and ligand-gated ion channels like NMDA receptors, which open upon neurotransmitter binding (Catterall, 2011, Cold Spring Harbor Perspectives in Biology). Additionally, store-operated calcium entry (SOCE) is a critical pathway where the depletion of internal calcium stores triggers the activation of Orai1 channels by STIM1 sensors (Prakriya & Lewis, 2015, Physiological Reviews). Calcium acts as a ubiquitous second messenger, regulating functions such as muscle contraction, neurotransmitter release, and gene expression (Clapham, 2007, Cell). Dysregulation of these pathways is linked to a wide range of diseases, including hypertension, cardiac arrhythmias, chronic pain, and neurodegenerative conditions such as Alzheimer's and Parkinson's disease (Bezprozvanny, 2009, Trends in Molecular Medicine). Therapeutic strategies often focus on specific channel blockers or modulators, such as dihydropyridines for cardiovascular issues or NMDA antagonists for neurological disorders. However, the widespread distribution of calcium channels poses significant challenges for drug specificity and safety (Zamponi et al., 2015, Pharmacological Reviews).

Other names

Calcium entry pathwaysCa2+ influx mechanismsStore-operated calcium entryVoltage-gated calcium entryReceptor-operated calcium entry

Inhibition or modulation of calcium ion transport through various channel types including voltage-gated, ligand-gated, and store-operated channels (Catterall, 2011, Cold Spring Harbor Perspectives in Biology; Prakriya & Lewis, 2015, Physiological Reviews).