Ceruloplasmin and Ferroxidase Activity
Why This Axis Is Important
Ceruloplasmin is a copper-dependent ferroxidase that helps oxidize Fe2+ to Fe3+ during cellular iron export via ferroportin.
If this axis is impaired, iron can be trapped in tissue and dysregulated in plasma.
Your Pattern
- Copper: 14.3 umol/L (low-normal)
- Ceruloplasmin: 0.206 g/L (low-normal)
- Iron metrics elevated (TSAT 60%)
This does not prove ceruloplasmin dysfunction, but it supports a biologically plausible contribution to persistent iron dysregulation.
Mechanistic Summary
- Ferroportin exports Fe2+
- Ceruloplasmin/hephaestin oxidize Fe2+ to Fe3+
- Fe3+ binds transferrin
Colour Key
🟢 Normal / safe | 🔴 Impaired / risk
flowchart LR
subgraph Normal["Normal Pathway"]
FPN["Ferroportin exports Fe2+"]
CP["Ceruloplasmin oxidises"]
FE3["Fe3+ formed"]
TF["Fe3+ binds transferrin"]
SAFE["Safe transport"]
end
subgraph Impaired["Low Ceruloplasmin"]
FPN2["Ferroportin exports Fe2+"]
LOW["Ceruloplasmin insufficient"]
FE2["Fe2+ accumulates"]
NTBI["NTBI in plasma"]
TOX["Oxidative damage"]
end
FPN --> CP
CP --> FE3
FE3 --> TF
TF --> SAFE
FPN2 --> LOW
LOW --> FE2
FE2 --> NTBI
NTBI --> TOX
classDef normal fill:#85c1e9,stroke:#2471a3,color:#0a1929
classDef impaired fill:#b06272,stroke:#8a4252,color:#fff
class FPN,CP,FE3,TF,SAFE normal
class FPN2,LOW,FE2,NTBI,TOX impairedWhen ferroxidase support is poor, efficient iron export/handling is compromised.
Evidence Base
- Doguer C et al. Compr Physiol 2018;8(4):1433-1461 - iron-copper intersection in intestine/liver (PMC6460475)
- Chen Z et al. Sci Rep 2019;9:9437 - multicopper ferroxidase deficiency causes iron accumulation and oxidative injury (PMC6603037)
- Hellman NE, Gitlin JD. Annu Rev Nutr 2002;22:439-458 - classic ceruloplasmin metabolism/function review
- Linder MC. Metallomics 2016;8(9):887-905 - plasma copper-binding components update
Clinical Notes
- Serum ceruloplasmin concentration is not the same as direct ferroxidase activity
- Ceruloplasmin is an acute-phase reactant; inflammation can alter interpretation
- Functional testing (if available) may add context when copper status is borderline