Hyperthermia stimulates nitric oxide formation: electron paramagnetic resonance detection of .NO-heme in blood.

Hyperthermia stimulates nitric oxide formation: electron paramagnetic resonance detection of .NO-heme in blood.
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热疗刺激一氧化氮形成:电子顺磁共振检测血液中的NO-血红素。

DOI:
--
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发表时间:
1994
影响因子:
3.3
通讯作者:
C. Gisolfi
C. Gisolfi
中科院分区:
医学2区
文献类型:
--
作者:
D. M. Hall;Garry R. Buettner;Ronald D. Matthes;C. Gisolfi

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我们实验室以前的实验已经证明,严重的高温会导致内脏血管收缩的选择性丧失。使用电子顺磁共振光谱扫描全血样品收集在体内从门静脉和股动脉清醒的无约束的大鼠,我们观察到的光谱可检测的物种在门静脉血中的所有热应激动物的浓度增加。这些光谱由至少三种不同的物质组成:一种具有宽的特征,其未配对电子(g)的有效g因子(g)为2.06,被分配给铜结合急性期蛋白质血浆铜蓝蛋白,而两种具有在核心温度> 39摄氏度时进化的较窄的特征,其代表半醌自由基和NO-血红素。这种热诱导信号显示了经典的氮三重态超精细结构(氮超精细分裂常数= 17.5高斯,中心在g = 2.012),其与五配位血红素络合物一致,并且是亚铁. NO-血红素加合物[(α 2+NO)β 3+]2中与氮偶联的未成对电子的特征。随着核心温度升高至> 39 ° C,该信号的强度增加约两倍,在热暴露后1小时达到峰值,浓度大于基础浓度的三倍。在相应的动脉血样中未观察到该种属。这是第一次证明,全身高温产生增加的自由基和金属结合蛋白在大鼠的静脉血中的浓度,并表明,严重的高温刺激增强局部释放的内脏循环内的NO。
Previous experiments from our laboratory have demonstrated that severe hyperthermia results in a selective loss of splanchnic vasoconstriction. Using electron paramagnetic resonance spectroscopy to scan whole blood samples collected in vivo from the portal vein and femoral artery of conscious unrestrained rats, we observed an increase in the concentration of spectroscopy-detectable species in portal venous blood of all heat-stressed animals. These spectra consisted of at least three distinct species: one with a broad feature having an effective g factor for the unpaired electron (g) of 2.06 assigned to the copper-binding acute phase protein ceruloplasmin, and two with narrower features that evolved at core temperatures > 39 degrees C representing a semiquinone radical and .NO-heme. This heat-induced signal displays the classic nitrogen triplet hyperfine structure (nitrogen hyperfine splitting constant = 17.5 gauss, centered at g = 2.012) that is consistent with a five-coordinate heme complex and is characteristic of an unpaired electron coupled to nitrogen in the ferrous .NO-heme adduct [(alpha 2+NO) beta 3+]2. The intensity of this signal increased approximately twofold as core temperature rose to > 39 degrees C, peaking 1 h post-heat exposure at greater than threefold basal concentration. This species was not seen in corresponding arterial blood samples. This is the first demonstration that whole body hyperthermia produces increased concentrations of radicals and metal binding proteins in the venous blood of the rat and suggests that severe hyperthermia stimulates an enhanced local release of .NO within the splanchnic circulation.
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