Nucleolar protein 3 (apoptosis repressor with CARD domain) (NOL3)

Nucleolar protein 3 (NOL3, also known as ARC) is a multifunctional anti-apoptotic regulator encoded by the NOL3 gene[1][2][3]. It inhibits programmed cell death by blocking both extrinsic (death receptor-mediated) and intrinsic (mitochondrial-mediated) apoptosis pathways, interacting with key proteins such as FAS, FADD, caspase 8, BAX, and p53[1][2]. NOL3's activity extends to calcium-mediated cell death, oxidative stress-induced apoptosis, and TNF-induced necrosis. Dysregulation or overexpression of ARC/NOL3 is implicated in cancer chemoresistance, enhanced tumor progression, and poor prognosis; altered function or deletion can result in hematologic disorders like myeloproliferative neoplasm. ARC/NOL3 serves regulatory and survival roles in terminally differentiated tissues, especially in cardiac myocytes and neurons[2]. Although widely studied as a marker and survival factor, no direct inhibitors or drugs for NOL3 are currently in clinical use; its complex biology poses challenges for therapy targeting apoptotic pathways[1][2][3].

Other names

ARCNOPNOP30MYPFCMCARD2Muscle-enriched cytoplasmic proteinNucleolar protein of 30 kDaApoptosis repressor with CARD