Abstract
Background: Peptidyl arginine deiminase IV (PADI4, also called PAD4), a Ca2+-dependent posttranslational modification enzyme, catalyzes the conversion of arginine residues to non-coded citrulline residues. Dysregulation of PADI4 is involved in a variety of diseases including rheumatoid arthritis (RA), multiple sclerosis (MS), Alzheimer's disease (AD) and many kinds of malignant tumors.
Objective: The roles of PADI4 in different tumors and the underlying molecular mechanisms are presented in this article.
Results: PADI4-mediated citrullination is associated with either transcriptional activation or repression in different contexts. Abnormal expression of PADI4 exists in a variety of malignant tumors and affects tumor progression and metastasis. Epithelial-to-mesenchymal transition (EMT), apoptosis, and neutrophil extracellular traps (NETs) may be the underlying molecular mechanisms.
Conclusion: PADI4 plays crucial role in the occurrence, development, and metastasis of tumors, and PADI4 may be an effective biomarker for cancer prognosis and a potential target for cancer treatment.
Keywords: PADI4, citrullination, cancer, EMT, NETs, apoptosis.
Graphical Abstract
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