Hemoglobin (Heme iron site) (Hb)

The target refers to the heme iron sites within Hemoglobin Vesicles (HbV-101), which are artificial oxygen carriers designed to mimic the structure and function of natural red blood cells (Sakai, 2017). These sites consist of a protoporphyrin IX ring coordinating a central ferrous iron (Fe2+) atom, which serves as the functional center for the reversible binding and transport of molecular oxygen (Taguchi et al., 2017). HbV-101 encapsulates highly concentrated human hemoglobin within a phospholipid bilayer vesicle, a design intended to prevent the toxic side effects associated with cell-free hemoglobin, such as extravasation into the vascular wall and subsequent nitric oxide scavenging (Azuma et al., 2022). This molecular arrangement is primarily developed for emergency resuscitation in conditions like hemorrhagic shock and acute anemia, where rapid restoration of oxygen-carrying capacity is critical for survival (Sakai, 2017). The therapeutic efficacy of these sites is typically optimized by modulating the oxygen affinity (P50) using allosteric effectors to ensure efficient oxygen loading in the lungs and unloading in peripheral tissues (Taguchi et al., 2017).

Other names

Hemoglobin vesicleHbVLiposomal hemoglobinArtificial red cellHeme iron siteHbV-101

Reversible coordination of molecular oxygen to the ferrous iron (Fe2+) atom within the protoporphyrin IX ring of encapsulated hemoglobin, facilitating systemic oxygen delivery and offloading at hypoxic tissues (Sakai, 2017).