Flipping the molecular switch for innate protection and repair of tissues: Long-lasting effects of a non-erythropoietic small peptide engineered from erythropoietin

Pharmacology & Therapeutics
M CollinoMichael Brines

Abstract

Many disease processes activate a cellular stress response that initiates a cascade of inflammation and damage. However, this process also triggers a tissue protection and repair system mediated by locally-produced hyposialated erythropoietin (hsEPO). Although recombinant EPO is used widely for treating anemia, potential use of recombinant EPO for tissue-protection is limited by rises in hematocrit, platelet activation, and selectin expression resulting in a high risk of thrombosis. Importantly, the erythropoietic and tissue-protective effects of EPO are mediated by different receptors. Whereas EPO stimulates red cell progenitors by binding to an EPO receptor (EPOR) homodimer, a heterodimer receptor complex composed of EPOR and β common receptor (βcR) subunits, termed the innate repair receptor (IRR), activates tissue protection and repair. The IRR is typically not expressed by normal tissues, but instead is rapidly induced by injury or inflammation. Based on this understanding, EPO derivatives have been developed which selectively activate the IRR without interacting with the EPOR homodimer. The latest generation of specific ligands of the IRR includes an 11 amino acid peptide modeled from the three dimensional structure of th...Continue Reading

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