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首页> 外文期刊>Molecular and Cellular Biology >Disruption of γ-Glutamyl Leukotrienase Results in Disruption of Leukotriene D4 Synthesis In Vivo and Attenuation of the Acute Inflammatory Response
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Disruption of γ-Glutamyl Leukotrienase Results in Disruption of Leukotriene D4 Synthesis In Vivo and Attenuation of the Acute Inflammatory Response

机译:γ-谷氨酰白三烯酶的破坏导致白三烯D4体内合成的破坏和急性炎症反应的减弱

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To study the function of γ-glutamyl leukotrienase (GGL), a newly identified member of the γ-glutamyl transpeptidase (GGT) family, we generated null mutations in GGL (GGLtm1) and in both GGL and GGT (GGLtm1-GGTtm1) by a serial targeting strategy using embryonic stem cells. Mice homozygous for GGLtm1 show no obvious phenotypic changes. Mice deficient in both GGT and GGL have a phenotype similar to the GGT-deficient mice, but ~70% of these mice die before 4 weeks of age, at least 2 months earlier than mice deficient only in GGT. These double-mutant mice are unable to cleave leukotriene C4 (LTC4) to LTD4, indicating that this conversion is completely dependent on the two enzymes, and in some organs (spleen and uterus) deletion of GGL alone abolished more than 90% of this activity. In an experimental model of peritonitis, GGL alone is responsible for the generation of peritoneal LTD4. Further, during the development of peritonitis, GGL-deficient mice show an attenuation in neutrophil recruitment but not of plasma protein influx. These findings demonstrate an important role for GGL in the inflammatory response and suggest that LTC4 and LTD4 have distinctly different functions in the inflammatory process.
机译:为了研究新确定的γ-谷氨酰转肽酶(GGT)家族成员γ-谷氨酰白三烯酶(GGL)的功能,我们在GGL(GGL tm1 )中以及在GGL和通过使用胚胎干细胞的系列靶向策略,GGT(GGL tm1 -GGT tm1 )。 GGL tm1 纯合的小鼠没有明显的表型变化。缺乏GGT和GGL的小鼠的表型与缺乏GGT的小鼠相似,但是这些小鼠中约有70%的小鼠在4周龄之前死亡,比仅缺乏GGT的小鼠至少早2个月死亡。这些双突变小鼠无法将白三烯C 4 (LTC 4 )裂解为LTD 4 ,表明这种转化完全取决于两种酶,在某些器官(脾脏和子宫)中,仅GGL的缺失就消除了90%以上的这种活性。在腹膜炎的实验模型中,仅GGL负责腹膜LTD 4 的产生。此外,在腹膜炎的发展过程中,GGL缺陷型小鼠的中性粒细胞募集减弱,但血浆蛋白流入却没有减弱。这些发现证明了GGL在炎症反应中的重要作用,并表明LTC 4 和LTD 4 在炎症过程中具有明显不同的功能。

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