Ferroportin

Disease Contexts#

Iron Supplementation Paradox#

The hepcidin-ferroportin axis explains why oral iron supplementation can be harmful in inflammatory conditions:^{[1]Mechanism of Iron Ion Homeostasis in Intestinal Immunity and Gut Microbiota RemodelingHonghong Bao, Yi Wang, Hanlin Xiong et al. · 2024Open reference 1 ↓}

1. Inflammation raises hepcidin, destroying ferroportin
2. With ferroportin gone, supplemental iron cannot be exported from enterocytes into blood
3. Unabsorbed iron reaches the colon, where it feeds siderophore-producing Enterobacteriaceae
4. Gut Dysbiosis worsens, increasing inflammation, raising hepcidin further—a vicious cycle

This is the mechanistic basis for the STOP: Iron supplementation in IBD and similar STOP pages.

Chronic Kidney Disease#

In CKD, hepcidin accumulates due to reduced renal clearance and chronic inflammation, driving persistent ferroportin degradation. The resulting functional iron deficiency contributes to CKD anemia, and iron supplementation faces the same paradox as in IBD.^{[2]Molecular Mechanisms of Cellular Injury and Role of Toxic Heavy Metals in Chronic Kidney DiseaseManish Mishra, Larry Nichols, Aditi A. Dave et al. · 2022Open reference 2 ↓}

Neurodegeneration#

Brain ferroportin expression is disrupted in Parkinson's disease and Alzheimer's disease. Reduced ferroportin in the substantia nigra (PD) and hippocampus (AD) contributes to regional iron accumulation, increasing Ferroptosis vulnerability.^{[3]Microbial Metallomics and Parkinson's Disease: A Unified Metal-Driven Framework Linking Ferroptosis, Dysbiosis, and alpha-Synuclein PathologyKaren Pendergrass · 2025Open reference 3 ↓}

Cancer#

Many cancer types downregulate ferroportin to create an iron-accumulating phenotype that supports rapid cell division. Ovarian cancer cells upregulate transferrin receptor 1 (TfR1) while downregulating ferroportin, trapping iron for proliferative metabolism.