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Mycophenolic acid (MPA) is an approved drug widely used as an immunosuppressant agent for the prevention of rejection in organ transplant patients and for managing various autoimmune disorders. Pharmacological studies have shown that the plasma exposure of MPA is critical to maintaining its efficacy, leading to a significant focus on MPA therapeutic drug monitoring (TDM) in clinical practice. Additionally, many papers have been published regarding MPA's absorption, distribution, metabolism, and elimination (ADME) characteristics, which are the key disposition factors affecting the plasma exposure of MPA. In this paper, we review the current data and information in the literature on the ADME properties of MPA and discuss their implications for MPA’s TDM. We also analyze the disposition of MPA major metabolites mycophenolic acid-glucuronide (MPAG), and acyl-glucuronide (AcMPAG), highlighting the key factors that affect MPA plasma exposure, including the influence of transporters, namely Multidrug Resistance-Associated Protein 2 (MRP2), Breast Cancer Resistance Protein (BCRP), Organic Anion-Transporting Polypeptides (OATPs), metabolic enzymes (i.e., UDP-Glucuronosyltransferases (UGTs)), enterohepatic recycling (EHR), and protein binding. We expect to provide researchers with a comprehensive understanding of factors that could affect MPA’s TDM to ensure its efficacy.
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