Iron-protoporphyrin IX (Heme) (Heme)

Iron-protoporphyrin IX, commonly known as heme, is a vital metalloporphyrin that serves as a prosthetic group for numerous hemoproteins, including hemoglobin, myoglobin, and cytochromes [1, 12]. It plays a central role in essential biological processes such as oxygen transport, electron transfer in the mitochondrial respiratory chain, and enzymatic catalysis by peroxidases and catalases [2, 8]. In the context of infectious disease, heme is a critical therapeutic target in malaria; Plasmodium parasites release large amounts of toxic free heme during hemoglobin digestion, which they must detoxify into inert hemozoin crystals [1, 3]. Antimalarial drugs like chloroquine work by inhibiting this crystallization process, leading to the accumulation of toxic heme that kills the parasite [3, 5]. Additionally, its precursor protoporphyrin IX is utilized in photodynamic therapy for cancer, where its accumulation and subsequent light activation generate reactive oxygen species to induce tumor cell death [11, 14]. Heme also serves as a signaling molecule and its dysregulation is linked to various pathological states, including porphyrias and hemolytic anemias [2, 16].

Other names

Heme BFerriprotoporphyrin IXFerroprotoporphyrin IXProtohemeHeminFe-PPIX

Inhibition of heme detoxification (hemozoin formation) in malaria parasites [1, 3, 5]; activation of endoperoxide drugs like artemisinin via Fenton-like reactions with Fe(II) heme [4]; photosensitization for photodynamic therapy using the precursor protoporphyrin IX [11, 14]; and heme replacement therapy in porphyria [1].