Macrophages: key players in erythrocyte turnover

Borges, Marina Dorigatti; Sesti-Costa, Renata

doi:10.1016/j.htct.2022.07.002

Cited by 4 publications

(1 citation statement)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lifespan of mature RBCs is ∼120 days. The removal of senescent or damaged RBCs involves tightly regulated molecular mechanisms, with participation of splenic and liver macrophages. − The phagocytic response of these macrophages is triggered by the absence of CD47 and the exposure of phosphatidylserine in the outer membrane leaflet of senescent or damaged RBCs . The progressive loss of elasticity and increased rigidity are also responsible for the recognition of RBCs by the phagocytic cells. , Another important mechanism promoting the engulfment of RBCs is triggered by the formation of antigens on the cells’ surface due to the interaction between denatured Hb and band 3, disrupting the membrane structure and leading to clustering of membrane proteins and the formation of protein aggregates.…”

Section: Rbc Aging In Circulation and In Packed Rbc For Transfusionmentioning

confidence: 99%

Oxidants and Antioxidants in the Redox Biochemistry of Human Red Blood Cells

et al. 2022

View full text Add to dashboard Cite

Red blood cells (RBCs) are exposed to both external and internal sources of oxidants that challenge their integrity and compromise their physiological function and supply of oxygen to tissues. Autoxidation of oxyhemoglobin is the main source of endogenous RBC oxidant production, yielding superoxide radical and then hydrogen peroxide. In addition, potent oxidants from other blood cells and the surrounding endothelium can reach the RBCs. Abundant and efficient enzymatic systems and low molecular weight antioxidants prevent most of the damage to the RBCs and also position the RBCs as a sink of vascular oxidants that allow the body to maintain a healthy circulatory system. Among the antioxidant enzymes, the thiol-dependent peroxidase peroxiredoxin 2, highly abundant in RBCs, is essential to keep the redox balance. A great part of the RBC antioxidant activity is supported by an active glucose metabolism that provides reducing power in the form of NADPH via the pentose phosphate pathway. There are several RBC defects and situations that generate oxidative stress conditions where the defense mechanisms are overwhelmed, and these include glucose-6-phosphate dehydrogenase deficiencies (favism), hemoglobinopathies like sickle cell disease and thalassemia, as well as packed RBCs for transfusion that suffer from storage lesions. These oxidative stress-associated pathologies of the RBCs underline the relevance of redox balance in these anucleated cells that lack a mechanism of DNA-inducible antioxidant response and rely on a complex and robust network of antioxidant systems.

show abstract