Stromal interaction molecule 2 (STIM2)

Stromal interaction molecule 2 (STIM2) is a type I transmembrane protein found primarily in the membrane of the endoplasmic reticulum (ER) and is encoded by the STIM2 gene[1][3]. It acts as a highly sensitive calcium (Ca²⁺) sensor, monitoring ER luminal calcium levels and regulating store-operated calcium entry (SOCE) by detecting minor depletions in ER calcium[1][3][5]. Upon Ca²⁺ decrease, STIM2 undergoes a conformational change and interacts with plasma membrane store-operated calcium (SOC) channels, such as Orai and TRPC, to facilitate calcium influx[1][3][5]. STIM2 is critical for basal Ca²⁺ homeostasis and fine-tuning of cellular calcium signaling, distinguishing itself from its homologue STIM1, which triggers SOCE upon larger calcium depletions[5]. It is ubiquitously expressed and involved in a broad range of processes, including neuronal signaling, immune cell activation, cell proliferation, migration, and gene expression[2][4][7]. Dysregulation or altered expression of STIM2 is implicated in tumorigenesis, neurodegenerative diseases (e.g., Alzheimer’s and Huntington’s), autoimmune disorders, cardiovascular disease, and metabolic conditions[2][3][4]. While not currently the direct target of specific drugs, its central role in cell signaling highlights potential therapeutic interest[2][3].

Other names

STIM2KIAA1482stromal interaction molecule 2

Drugs would typically modulate calcium signaling by affecting STIM2-mediated SOCE or ER calcium sensing, but no direct pharmacologic agents are currently approved or well-established to directly target STIM2[2][3].