Biophysical properties and oxygenation potential of high-molecular-weight glutaraldehyde-polymerized human hemoglobins maintained in the tense and relaxed quaternary states.

Biophysical properties and oxygenation potential of high-molecular-weight glutaraldehyde-polymerized human hemoglobins maintained in the tense and relaxed quaternary states.
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高分子量戊二醛聚合的人血红蛋白在紧张和松弛四元状态下的生物物理特性和氧合潜力。

DOI:
10.1089/ten.tea.2010.0353
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发表时间:
2011
影响因子:
--
通讯作者:
Palmer,AndreF
Palmer,AndreF
中科院分区:
--
文献类型:
--
作者:
Zhang,Ning;Jia,Yiping;Chen,Guo;Cabrales,Pedro;Palmer,AndreF

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最近的临床评价商业戊二醛聚合血红蛋白(PolyHbs)作为输血解决方案已经证明了几个不良副作用。其中最主要的是高血压效应。幸运的是,以前的研究表明,高血压效应可以通过从PolyHb混合物中去除游离血红蛋白(Hb)和低分子量(低MW)PolyHb来减弱。在这项工作中,聚合的人血红蛋白(PolyhHb)的解决方案是在两个不同的四元状态与高分子量合成,并进行广泛的渗滤,以去除游离血红蛋白和低分子量PolyhHb组分(<500 kDa)。所得PolyhHb溶液具有高分子量、明显的四元态、与O2和CO明显的反应活性、相似的NO脱氧速率常数、明显的自氧化速率常数、高粘度和低胶体渗透压。为了初步评估PolyhHb溶液对血管供养的周围组织的能力,我们在中空纤维生物反应器的数学模型中评估了PolyhHb将O2转运到培养的肝细胞的能力。生物反应器中单个中空纤维的结构与血管的结构相似,提供了一种评估PolyhHbs氧合潜力的简单方法,而无需进行昂贵且耗时的动物研究。据观察,具有低O2亲和性的PolyhHbs在生物反应器内对培养的肝细胞的氧合比高O2亲和性PolyhHbs更有效。总而言之,我们的结果表明,可以合成不含游离血红蛋白的高分子量PolyhHb和能够将O2输送到培养细胞/组织的低分子量PolyhHb成分。
Recent clinical evaluation of commercial glutaraldehyde-polymerized hemoglobins (PolyHbs) as transfusion solutions has demonstrated several adverse side effects. Chief among these is the hypertensive effect. Fortunately, previous studies have shown that the hypertensive effect can be attenuated by removing free hemoglobin (Hb) and low-molecular-weight (low-MW) PolyHbs from the PolyHb mixture. In this work, polymerized human Hb (PolyhHb) solutions were synthesized in two distinct quaternary states with high MW and subjected to extensive diafiltration to remove free Hb and low-MW PolyhHb components (<500 kDa). The resultant PolyhHb solutions possessed high MW, distinct quaternary state, distinct reactivities with O2and CO, similar NO deoxygenating rate constants, distinct autoxidation rate constants, high viscosity, and low colloid osmotic pressure. To preliminarily assess the ability of PolyhHb solutions to oxygenate surrounding tissues fed by a blood vessel, we evaluated the ability of PolyhHbs to transport O2to cultured hepatocytes in a mathematical model of a hollow fiber bioreactor. The structure of individual hollow fibers in the bioreactor is similar to that of a blood vessel and provides an easy way to assess the oxygenation potential of PolyhHbs without the need for expensive and time-consuming animal studies. It was observed that PolyhHbs with low O2affinities were more effective in oxygenating cultured hepatocytes inside the bioreactor than high O2affinity PolyhHbs. Taken together, our results show that it is possible to synthesize high-MW PolyhHbs with no free Hb and low-MW PolyhHb components that are capable of transporting O2to cultured cells/tissues.
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