PMID: 9178726Jun 1, 1997Paper

Effects of polymerization on the hypertensive action of diaspirin cross-linked hemoglobin in rats

The Journal of Laboratory and Clinical Medicine
Z AbassiAbdu I Alayash

Abstract

It is believed that the hypertensive effect of diaspirin crosslinked hemoglobin, a viable blood substitute, can be resolved by polymerization, which reduces the diffusion of this derivative into the interstitial space between nitric oxide-producing endothelium and the target vascular smooth muscle. We studied the systemic and renal responses to infusion of three cell-free human hemoglobins in anesthetized isovolemic rats: unmodified (HbA0), crosslinked (alpha-DBBF), and polymerized crosslinked (poly alpha-DBBF). HbA0 produced a significant increase in mean arterial blood pressure (MAP) throughout the 60-minute infusion. alpha-DBBF, on the other hand, produced a more marked and prolonged increase in MAP over 120 minutes. Only a moderate increase in MAP was observed in rats after a 30-minute infusion with poly alpha-DBBF. The extent of renal insufficiency produced by these proteins, as determined by the glomerular filtration rate, was in the following order: HbA0 > poly alpha-DBBF > alpha-DBBF. Infusion of poly alpha-DBBF, under hypovolemic but not isovolemic conditions in rats, produced an increase in heart rate, cardiac output, and stroke volume and a decrease in total peripheral resistance after 60 minutes. Chemical polymeriza...Continue Reading

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