摘要
目的 研究溴苯腈急性染毒对小鼠大脑皮层中γ-氨基丁酸(GABA)和谷氨酸(Glu)含量等指标的影响及二巯丙磺钠(Na-DMPS)的作用.方法 将30只ICR小鼠(雌雄各半)随机分成对照组和染毒组,每组10只.对照组予体积分数为10%的DMSO溶液(20ml/kg)灌胃;染毒组予溴苯腈(200mg/kg)灌胃染毒;Na-DMPS保护组予溴苯腈(200mg/kg)灌胃染毒后,即刻以Na-DMPS(300mg/kg)腹腔注射.观察6 h后处死,采用反相高效液相色谱法测定各组小鼠大脑皮层中GABA、Glu含量,同时采用紫外分光光度计比色法等方法测定大脑皮层中谷氨酰胺(Gln)含量及谷氨酰胺合成酶(GS)、谷氨酸脱羧酶(GAD)、γ-氨基丁酸转氨酶(GABA-T)的活力.结果 与对照组[GABA为(3.41±0.12)μmol/g、Glu为(14.00±0.16)μmol/g、Gln为(1.25±0.19)μmol/g、GAD为(13.50±0.25)μmol·g-1·h-1、GABA-T为(25.51±0.21)μmol·g-1·h-1、GS为(142.19±1.31)U/mgpro]比较,急性中毒组小鼠大脑皮层GABA[(3.14±0.14)μmol/g]含量降低,Glu[(17.54±0.40)μmol/g]和Gln[(3.35±0.27)μmol/g]含量增高,GAD[(11.93±0.15)μmol·g-1·h-1]、GABA-T[(24.15±0.22)μmol·g-1·h-1]、GS[(140.75±1.01)U/mg pro]活力下降,差异均有统计学意义(P<0.05);与急性中毒组相比,Na-DMPS组GABA[(3.52±0.30)μmol/g]含量升高,Glu[(14.20±0.32)μmol/g]和Gln[(1.32±0.17)μmol/g]含量降低,GAD[(13.01±0.45)μmol·g-1·h-1]、GABA-T[(25.19±0.26)μmol·g-1·h-1]、GS[(142.35±1.20)U/mgpro]活力增强,差异均有统计学意义(P<0.05);Na-DMPS保护组与对照组相比,大脑皮层中GABA、Glu、Gln含量,GAD、GABA-T、GS活力,差异均无统计学意义(P>0.05).结论 溴苯腈中毒所致小鼠中枢神经的毒性作用可能与大脑皮层组织中GABA和Glu含量的变化有关,Na-DMPS能改善溴苯腈中毒小鼠大脑皮层组织中GABA和Glu含量.
Objective To investigate the changes of γ-aminobutyric acid (GABA) and glutamate (Glu) in the cerebral cortex following acute bromoxynil intoxication in mice and the protective effect of sodium dimercaptopropane sulfonate (Na-DMPS). Methods 30 ICR mice were randomly divided into blank control group (10), exposure group (10) and Na-DMPS protection group (10). The levels of GABA and Glu in the cerebral cortex were measured by RP-HPLC. The glutamine (Gln) level and the glutamine synthetase (GS),glutamate decarboxylation enzyme (GAD), γ-aminobutyric acid transaminase (GABA-T) activity in the cerebral cortex were determined by U V colorimetric. Results Compared with the control group [GABA: (3.41 ±0. 12)μmol/g, Glu(14.00±0.16) μmol/g, Gln(1.25±0.19) μmol/g, GAD(13.50±0.25) μmol·g-1·h-1, GABA-T(25.51±0.21)μmol·g-1·h-1, GS( 142.19±1.31 ) U/mg pro], the level of GABA[(3.14±0. 14) μmol/g] was decreased (P〈0.05), whereas the level of Glu [(17.54±0.40) μmol/g] and Gln [(3.35±0.27) μmol/g] were increased (P〈0.05), the activity of GAD [( 11.93±0.15 ) μmol· g-1· h-1], GA BA-T[(24.15±0.22) μmol · g-1· h-1],GS [( 140.75±1.01 )U/mg pro] was decreased (P〈0.05) in acute intoxication group; Compared with the acute intoxication group, the level of GABA [(3.52±0.30) μmol/g] was increased (P〈0.05), whereas the level of Glu [( 14.20±0.32 ) μmol/g] and Gln [( 1.32±0.17 ) μmol/g] were decreased (P〈0.05), the activity of GAD [( 13.01 ±0.45 μmol ·g-1·h-1], GABA-T [(25.19±0.26) μmol·g-1 ·h-1, GS [(142.35±1.20) U/mg pro] was increased (P〈0.05 ) ;In contrast, the levels of GABA, Glu, Gln and the activity of GAD, GABA-T, and GS in Na-DMPS protection group were not significantly different in comparison with control group (P〉0.05). Conclusion The central toxic effects of mice with acute bromoxynil intoxication may be related to the changes of GABA a
出处
《中华劳动卫生职业病杂志》
CAS
CSCD
北大核心
2010年第10期752-755,共4页
Chinese Journal of Industrial Hygiene and Occupational Diseases
基金
基金项目:浙江省医学扶植重点建设学科计划(07-F04)
温州市科技计划项目资助(Y20090058)
浙江省医药卫生科学研究计划项目(2007B144)