AI Article Synopsis
- This study investigates how stabilizing hemoglobin in its T-state could help protect organs after blood flow is restored following ischemia.
- Researchers created different forms of human red blood cells (hRBCs) to test their effects during organ recovery after a period of low blood flow.
- Results showed that the T-state stabilized hemoglobin (alpha-NO-hRBC) led to better recovery of metabolic acidosis and bile flow compared to other types of hemoglobin, suggesting it could be a useful treatment for organ dysfunction after ischemia.
Article Abstract
This study aimed to examine if T-state stabilization of hemoglobin in erythrocytes could protect against postischemic organ injury. Human erythrocytes containing three different states of Hb allostery were prepared: control Hb (hRBC), CO-Hb that is stabilized under R-state with the 6-coordinated prosthetic heme (CO-hRBC), and alpha-NO-deoxyHb stabilized under T-state (alpha-NO-hRBC). To prepare alpha-NO-RBC, deoxygenated RBC was treated with FK409, a thiol-free NO donor, at its half molar concentration to that of Hb; this procedure resulted in the 5-coordinated NO binding on the alpha-subunit heme, as judged by electron spin resonance spectrometry. Rats were subject to 20 min systemic hemorrhage to maintain mean arterial pressure at 40 mm Hg, and reperfused with one of hRBCs. This protocol for ischemia, followed by 60 min reperfusion with physiological saline, caused modest metabolic acidosis and cholestasis. Administration of hRBC or COhRBC significantly attenuated cholestasis and improved acidosis. Rats treated with alpha-NO-hRBC exhibited greater recovery of metabolic acidosis and bile excretion than those treated with hRBC or CO-hRBC, displaying the best outcome of local oxygen utilization in hepatic lobules. Half-life time of alpha-NO-RBC administered in vivo was approximately 60 min. These results suggest that T-state Hb stabilization by NO serves as a stratagem to treat postischemic organ dysfunction.
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| http://dx.doi.org/10.1089/ars.2006.8.1847 | DOI Listing |
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