MINI REVIEW article
Front. Aging
Sec. Aging and Cancer
Volume 6 - 2025 | doi: 10.3389/fragi.2025.1680031
Geranylgeranoic Acid and the MAOB–CYP3A4 Axis: A Metabolic Shift Underlying Age-Related Liver Cancer Risk
Provisionally accepted- Kwassui Women's University, Nagasaki, Japan
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Geranylgeranoic acid (GGA) is a naturally occurring acyclic isoprenoid with chemopreventive effects against hepatocellular carcinoma. In mammals, GGA is endogenously synthesized via the oxidative metabolism of geranylgeraniol by monoamine oxidase B (MAOB). However, MAOB activity decreases with age, leading to reduced hepatic GGA levels. Emerging evidence suggests that cytochrome P450 3A4 (CYP3A4) may compensate for this decline, providing an alternative oxidative pathway in MAOB-deficient conditions. This mini-review summarizes the current findings on GGA biosynthesis and metabolism in the aging liver, focusing on the MAOB–CYP3A4 axis, in which MAOB serves as the primary enzyme for endogenous GGA synthesis and CYP3A4 provides a compensatory pathway under MAOB-deficient conditions, and its relevance to age-related hepatic dysfunction. By discussing recent evidence on enzymatic compensation and age-dependent metabolic changes, this review highlights how the CYP3A4-GGA pathway may help unravel the complexity of hepatic aging. These findings may provide a mechanistic basis for developing preventive strategies targeting age-related hepatocarcinogenesis, particularly in older individuals with reduced MAOB– GGA activity.
Keywords: Geranylgeranoic acid, monoamine oxidase B, Cytochrome P450 3A4, Hepatocellular Carcinoma, Aging, metabolic turning point, lipid biomarker, Oxidative Stress
Received: 05 Aug 2025; Accepted: 29 Sep 2025.
Copyright: © 2025 Tabata. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Yuki Tabata, tabata-yu@kwassui.ac.jp
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