摘要目的 观察黄绿青霉素(CIT)对低硒低蛋白大鼠心肌组织形态结构的影响.方法 将48只Wistar 雄性大鼠按2×2析因设计分为4组:低硒低蛋白加毒素组、低硒低蛋白无毒素组、常硒常蛋白加毒素组和常硒常蛋白无毒素组,每组12只.首先用常硒常蛋白或低硒低蛋白饲料喂养大鼠2个月,然后加毒素各组饲料中另加入8 mg·kg-1·d-1 CIT喂养2个月,再以加入10 mg·kg-1·d-1 CIT的饲料喂养2周,而无毒素各组继续喂饲原饲料.在实验终期将大鼠麻醉后进行股动脉放血处死,称量心脏质量,计算心脏质量指数,光镜下观察心肌组织病理学变化.结果 低硒低蛋白加毒素组、低硒低蛋白无毒素组、常硒常蛋白加毒素组和常硒常蛋白无毒素组心脏质量指数分别为( 3.65±0.45)×10-3、(3.05±0.19)×10-3、(3.83±1.06)×10-3、(3.31±0.52)× 10-3.析因分析结果显示,CIT因素对大鼠心脏质量指数有明显影响作用(F=8.524,P＜0.05),而“硒+蛋白”因素未见明显影响作用(F=1.347,P＞0.05),且二者间不存在交互作用(F=0.048,P＞0.05).光镜下低硒低蛋白加毒素组大鼠心肌细胞血管周围出现纤维组织增生,细胞中出现明显的收缩带；低硒低蛋白无毒素组大鼠出现少量心肌细胞固缩；常硒常蛋白加毒素组大鼠心肌细胞出现坏死灶,并伴有炎性细胞浸润,出现较多固缩细胞；常硒常蛋白无毒素组大鼠心肌细胞群排列整齐,层次清晰,结构完好.结论 CIT可引起大鼠心肌组织变性坏死,低硒低蛋白也可造成大鼠心肌组织轻微损伤,而两因素叠加在一起时心肌损伤较严重.

abstractsObjective To observe the morphological feature of myocardial changes in adult rat exposed to citreoviridin(CIT) with selenium and protein deficiency.Methods According to 2 × 2 factorial design,48 healthy male Wistar rats aged 4-week were randomly divided into four groups:group Ⅰ (Se-Pro-CIT+,low selenium and low protein plus CIT group),group Ⅱ (Se-Pro-CIT-,low selenium and low protein without CIT group),group Ⅲ (Se+Pro+CIT+,adequate selenium and adequate protein plus CIT group),and group Ⅳ (Se+Pro+CIT-,adequate selenium and adequate protein without CIT group),12 rats in each group.After one week of normal adaptive feeding,all the rats were fed with selenium and protein deficiency feed for 2 months,and then the animals in group Ⅰ and group Ⅲwere fed with 8 mg·kg-1 ·d-1 of CIT for 2 more months,after that the CIT dose was increased to 10 mg·kg-1 ·d-1 for the final 2 weeks.At the end of the experiment,all the rats were sacrificed by femoral artery bleeding,and body and heart weight were measured.Heart weight index was calculated and histopathological changes were observed under light microscope.Results Heart weight indexes of the 4 groups(Se-Pro-CIT+,Se-Pro-CIT-,Se+Pro+CIT+ and Se+Pro+CIT- groups) were (3.65 ± 0.45) × 10-3,(3.05 ± 0.19) × 10-3,(3.83 ± 1.06) × 10-3 and (3.31 ± 0.52) × 10-3,respectively.The results of factorial analysis showed that the effects of CIT on heart weight index were statistically significant(F =8.524,P ＜ 0.05 ),the effects of "Se + Pro" were not statistically significant(F =1.347,P ＞ 0.05),and there were no interactions between the two factors (F =0,048,P ＞ 0.05).Morphologically,tissue fibrosis around branch coronary artery in group Ⅰ rats,plenty of cardiocyte pycnosis in group Ⅱ,and myocardial scattered necrotic foci in group Ⅲ were observed,accompanied by inflammatory cell infiltration in group Ⅲ,and normal myocardial structure in group Ⅳ rats.Conclusions Citreoviridin plays a major role in causing myocardial injury( degeneration and necrosis) and CIT combined with selenium and protein deficiency can aggravate the