S100 calcium-binding protein A1 and Nucleolar protein 3 (S100A1 and ARC)

S100 calcium-binding protein A1 (S100A1) and Nucleolar protein 3 (NOL3, commonly known as ARC) are critical regulators of cardiomyocyte physiology and survival. S100A1 acts as a calcium-sensor protein that enhances cardiac contractility by modulating the activity of the ryanodine receptor 2 (RyR2) and the sarcoplasmic reticulum Ca2+-ATPase (SERCA2a), while also supporting mitochondrial energy production [1, 5, 10]. ARC is a potent anti-apoptotic protein that inhibits both intrinsic and extrinsic cell death pathways by interacting with caspases, BAX, and p53, thereby protecting cardiomyocytes from stress-induced death [9, 13, 15]. In conditions such as heart failure and Duchenne muscular dystrophy (DMD) cardiomyopathy, both proteins are frequently downregulated, leading to impaired calcium handling and accelerated cell loss [2, 6, 11]. Therapeutic strategies, particularly adeno-associated virus (AAV)-mediated gene therapy, aim to overexpress these proteins to restore cardiac function and improve patient survival [8, 16]. Recent research highlights the synergistic potential of dual S100A1 and ARC overexpression in treating complex cardiomyopathies by simultaneously addressing calcium dysregulation and cell death [6, 14].

Other names

S100 calcium-binding protein A1S100-alphaNOL3Nucleolar protein 3Apoptosis repressor with CARDNOP30Muscle-enriched cytoplasmic proteinApoptosis repressor with caspase recruitment domain

Viral-mediated gene overexpression to restore intracellular calcium homeostasis and inhibit programmed cell death pathways.