Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-20201
Boretti, F S; Buehler, P W; D'Agnillo, F; Kluge, K; Glaus, T M; Butt, O I; Jia, Y; Goede, J; Pereira, C P; Maggiorini, M; Schoedon, G; Alayash, A I; Schaer, D J (2009). Sequestration of extracellular hemoglobin within a haptoglobin complex decreases its hypertensive and oxidative effects in dogs and guinea pigs. Journal of Clinical Investigation, 119(8):2271-2280.
Release of hemoglobin (Hb) into the circulation is a central pathophysiologic event that contributes to morbidity and mortality in chronic hemolytic anemias and severe malaria. These toxicities arise from Hb-mediated vasoactivity, possibly due to NO scavenging and localized tissue oxidative processes. Currently, there is no established treatment that targets circulating extracellular Hb. Here, we assessed the role of haptoglobin (Hp), the primary scavenger of Hb in the circulation, in limiting the toxicity of cell-free Hb infusion. Using a canine model, we found that glucocorticoid stimulation of endogenous Hp synthesis prevented Hb-induced hemodynamic responses. Furthermore, guinea pigs administered exogenous Hp displayed decreased Hb-induced hypertension and oxidative toxicity to extravascular environments, such as the proximal tubules of the kidney. The ability of Hp to both attenuate hypertensive responses during Hb exposure and prevent peroxidative toxicity in extravascular compartments was dependent on Hb-Hp complex formation, which likely acts through sequestration of Hb rather than modulation of its NO- and O2-binding characteristics. Our data therefore suggest that therapies involving supplementation of endogenous Hb scavengers may be able to treat complications of acute and chronic hemolysis, as well as counter the adverse effects associated with Hb-based oxygen therapeutics.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > University Hospital Zurich > Clinic and Policlinic for Internal Medicine|
04 Faculty of Medicine > University Hospital Zurich > Clinic for Hematology
05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals > Clinic for Small Animal Internal Medicine
|DDC:||570 Life sciences; biology|
610 Medicine & health
|Deposited On:||11 Jan 2010 15:46|
|Last Modified:||23 Nov 2012 15:32|
|Publisher:||American Society for Clinical Investigation|
|Free access at:||PubMed ID. An embargo period may apply.|
|WoS Citation Count:||39|
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