Ferritin heavy chain (FTH1) (FTH1)

Ferritin heavy chain (FTH1) is a ubiquitous intracellular protein essential for the safe storage of iron, preventing the formation of toxic free radicals by sequestering iron in a non-toxic ferric state (UniProt P02794). In the field of regenerative medicine, FTH1 is frequently engineered into mesenchymal stem cells (MSCs) to serve as a genetic reporter; the resulting accumulation of iron within the ferritin cores creates a paramagnetic signal that enables non-invasive, longitudinal tracking of the cells via magnetic resonance imaging (MRI) (PubMed: 15654751). This technology allows researchers to monitor the homing, distribution, and persistence of MSCs in disease models such as cancer and cardiovascular injury (PubMed: 20570443). Beyond its role as an imaging agent, the iron-loaded ferritin core can be targeted by external alternating magnetic fields to induce mechanical or thermal stimuli, potentially controlling cell signaling or drug release (PubMed: 29165343). However, the use of FTH1 as a target requires careful management of iron levels, as excessive iron loading can trigger oxidative stress and compromise the therapeutic viability of the engineered MSCs (PubMed: 25650484).

Other names

Ferritin heavy chain 1FTHFTHL6Ferritin H subunitPIG15Cell-tracking reporter gene

FTH1 acts as a ferroxidase enzyme that catalyzes the oxidation of ferrous iron (Fe2+) to ferric iron (Fe3+), which is then sequestered within the protein's nanocage to form a mineralized iron core. In engineered cells, this core serves as a paramagnetic contrast agent for magnetic resonance imaging (MRI) and a transducer for external magnetic fields.