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Ferritinophagy: Assessing the Selective Degradation of Iron by Autophagy in Human Fibroblasts
Published on: February 23, 2024
Predicting iron overload in hyperferritinemia
John K Olynyk1, Eng Gan, Terrence Tan
1School of Medicine and Pharmacology, Faculty of Medicine, University of Western Australia, Nedlands, Western Australia. john.olynyk@uwa.edu.au
Summary
Hyperferritinemia with normal transferrin saturation and no hereditary hemochromatosis gene mutations is unlikely to indicate significant hepatic iron overload. This finding aids in diagnosing iron overload conditions.
Area of Science:
- Hepatology
- Genetics
- Clinical Diagnostics
Background:
- Hyperferritinemia, an elevated serum ferritin level, is a common clinical finding.
- Determining the cause of hyperferritinemia, particularly hepatic iron overload, is crucial for patient management.
- Hereditary hemochromatosis (HH) due to HFE gene mutations is a primary cause of iron overload.
Purpose of the Study:
- To investigate the prevalence of hepatic iron overload in individuals with hyperferritinemia.
- To differentiate between HH-related iron overload and other causes of elevated ferritin.
- To assess the utility of transferrin saturation and HFE mutation status in predicting hepatic iron concentration.
Main Methods:
- Fifty-two subjects with hyperferritinemia (serum ferritin >350 microg/L) were categorized into three groups based on transferrin saturation and HFE mutation status.
- Group 1: Increased transferrin saturation, no significant HFE mutations.
- Group 2: Increased transferrin saturation, C282Y homozygosity or C282Y/H63D compound heterozygosity.
- Group 3: Normal transferrin saturation, no significant HFE mutations.
- Hepatic iron concentration (HIC) was quantified using magnetic resonance R2 relaxometry.
Main Results:
- Subjects with HFE-related hereditary hemochromatosis (Group 2) exhibited significantly higher hepatic iron concentration (123 +/- 22 micromol/g) compared to those without (39 +/- 4 and 36 +/- 5 micromol/g).
- Nine out of 22 subjects in Group 2 showed HIC more than three times the upper limit of normal.
- No subjects in Group 1 or Group 3 had HIC exceeding three times the upper limit of normal.
Conclusions:
- Elevated hepatic iron concentration (more than 3x upper limit of normal) is highly improbable in hyperferritinemic individuals without HFE-related hereditary hemochromatosis.
- This study suggests that normal transferrin saturation in the presence of hyperferritinemia, without HFE mutations, effectively rules out significant hepatic iron overload.
- The findings support a targeted diagnostic approach for hyperferritinemia, focusing on HFE testing and transferrin saturation to identify hereditary hemochromatosis.
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