Dimeric surfactant protein B peptide sp-b(1-25) in neonatal and acute respiratory distress syndrome.

Dimeric surfactant protein B peptide sp-b(1-25) in neonatal and acute respiratory distress syndrome.
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二聚表面活性蛋白 B 肽 sp-b(1-25) 在新生儿和急性呼吸窘迫综合征中的应用。

DOI:
10.1080/01902140260426733
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发表时间:
2002
期刊:
Experimental lung research.
影响因子:
--
通讯作者:
Waring,AlanJ
Waring,AlanJ
中科院分区:
--
文献类型:
--
作者:
Walther,FransJ;Hernandez-Juviel,JoseM;Gordon,LarryM;Sherman,MarkA;Waring,AlanJ

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表面活性蛋白B(SP-B)是一种对正常肺功能至关重要的组成蛋白。单体SP-B1-25(MSP-B1-25)是一种基于人SP-B N-末端结构域的多肽,与磷脂混合后可部分恢复表面活性物质缺乏动物的肺功能。由于天然SP-B是同源二聚体,我们合成并检测了二聚体SP-B1-25(DSP-B1-25)。圆二色谱(CD)和傅里叶变换红外光谱(FTIR)表明,SP-B1-25的二级构象没有受到二聚体的明显干扰。在新生儿呼吸窘迫综合征(RDS)和急性呼吸窘迫综合征(ARDS)模型上比较磷脂和苏万达对肺功能的影响。胎龄27d的早产兔出生时给予肺表面活性物质100 mg/kg,潮气量10mL/kg呼吸1h。每15分钟监测一次动态顺应性,并测量死后压力-容量曲线。成年大鼠灌胃造成肺表面活性物质缺乏,给予肺表面活性物质100 mg/kg,通气2小时。用动脉血气和每15分钟动态顺应性以及死后压力-容量曲线评估肺功能。两种模型大鼠的肺体积和灌洗组大鼠的氧合均高于Survanta组和MSP-B1-25组。提示在恢复新生儿RDS和ARDS肺功能方面,DSP-B1-25比MSP-B1-25更有效。
Surfactant protein B (SP-B) is a constituent surfactant protein critical for normal lung function. Monomeric SP-B 1-25 (mSP-B 1-25) , a peptide based on the N-terminal domain of human SP-B, mixed in phospholipids partially restores lung function in surfactant-deficient animals. Because native SP-B is a homodimer, we synthesized and tested dimeric SP-B 1-25 (dSP-B 1-25) . Circular dichroism (CD) and Fourier Transform Infrared (FTIR) spectroscopy indicated that the secondary conformation of SP-B 1-25 was not significantly perturbed by dimerization. The effects on lung function were compared to phospholipids and Survanta in models of neonatal respiratory distress syndrome (RDS) and acute RDS (ARDS). Preterm rabbits born at 27 days of gestation received 100 mg surfactant / kg at birth and were ventilated for 1 hour with a tidal volume of 10 mL / kg. Dynamic compliance was monitored every 15 minutes and postmortem pressure-volume curves were measured. Adult rats were lavaged to induce surfactant deficiency, treated with 100 mg surfactant / kg, and ventilated for 2 hours. Lung function was assessed using arterial blood gases and dynamic compliance every 15 minutes and postmortem pressure-volume curves. Lung volumes in both models and oxygenation in the lavaged rats were consistently higher in the dSP-B 1-25 than in the Survanta and mSP-B 1-25 surfactant groups. The data suggest that dSP-B 1-25 is more efficient in restoring lung function in neonatal RDS and ARDS than mSP-B 1-25 surfactant.
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