In vivo Pharm acodynam ic Effect of Thiam phenicol in Serum of Carassius auratus on Aerom onas hydrophila

This study was to investigate the in vitro pharmacodynamic effect of thiamphenicol( TAP) in serum of Carassius auratus on Aeromonas hydrophila. By combining the in vivo pharmacokinetics and in vitro pharmacodynamics,the pharmacodynamic effect of TAP on Aeromonas hydrophila was studied,and the data were processed and analyzed by software Excel 2007,Kinetica3P97 and Kinetica4. 4. The results showed that oral administration of singly 30 mg /kg TAP assumed a rapid assimilation-quickly peaking-slowly dispelling trend in Carassius auratus. The related parameters were measured as follows: time of peaked plasma concentration of TAP( Tpeak) of 1.5 h,peak concentration( Cmax) of 37.172 μg/mL and absorption rate( ka) of 1.523 h,half-life period T1/2( ka) of 0.455 h,lag time( TL)of 0. 02 h,elimination half life T1/2( ke) of 16.712 h. The half maximal effective concentration( EC50) was 14.28 h. The PK-PD parameters were 32.41 h in AUC0- 24/ MICserumand 23. 23 in Cmax/MICserum. Employing an inhibitory Sigmoid Emax model,the administration dosage of TAP for preventing Aeromonas hydrophila-caused bacterial septicemia was 8. 61- 46. 20 mg /kg in clinical application. Based on these,we proposed the optimal administration route for preventing and controlling the Aeromonas hydrophila-caused bacterial septicemia: delivering TAP at the ratio of 46. 20 mg /kg on diseased Carassius auratus by mixing with baits or oral administration,followed by delivering with baits at ratio of 8. 61 mg /kg for preventing the Aeromonas hydrophila-caused bacterial septicemia. The results provided references for applying thiamphenicol for preventing and controlling the bacterial septicemia in aquatic livestock.

腺相关病毒介导增强型绿色荧光蛋白基因在晶状体上皮细胞中的表达

目的研究Ⅱ型重组腺相关病毒（recombinant adeno-associated virus 2，rAAV2）载体介导的增强型绿色荧光蛋白基因（enhanced green fluorescent protein，ECFP）对体外培养兔晶状体上皮细胞的转染和表达情况，为rAAV携带目的基因防治后囊膜混浊提供理论依据。方法组织块培养法体外培养兔晶状体上皮细胞。rAAV2-EGFP，按感染复数（multiplicity of infection，MOI）为10^3、10^4、10^5、4×10^5、10^6转染传2代细胞，转染后第1天、第3天、第5天、第7天、第9天、第11天在倒置荧光显微镜下观察晶状体上皮细胞中EGFP表达的阳性情况，记录200个细胞中EGFP阳性表达所占的百分比。当EGFP表达稳定后用激光共聚焦显微镜照相。用倒置显微镜观察rAAV转染对细胞生长和形态的影响。结果当MOI=10^3、10^4时，转染后第72小时晶状体上皮细胞中EGFP开始表达，当MOI=10^5、4×10^5、10^6时，转染后第24小时便可见EGFP阳性表达。随着MOI值的增大及时间的延长，EGFP表达效率逐渐增高，转染后第8-第9天达到高峰并维持，此时，MOI=10^3、10^4、10^5、4×10^5、10^6的转导效率分别为16％、41％、55％、86％、94％。对照组和转染组细胞的生长和形态特征无明显改变。结论腺相关病毒载体可以携带报告基因稳定转染晶状体上皮细胞，并且转染效率高，因而腺相关病毒携带目的基因防治后囊膜混浊是可行的。

An Experimental Study of the Protective Effects of Chinese Medicine Compound Eye-Patch on Asthenopia

Objective： To observe the therapeutic efficacy and the mechanism of Chinese medicine eye-patch with invigorating blood circulation and detoxification on asthenopia. Methods： A total of 180 rabbits were subjected to three tests, namely the skin microcircuiation, the microvascular regeneration in the skin and the skin temperature change, with 60 rabbits for each test. The rabbits in each test were randomly and equally divided into three groups： the normal control group was treated with physiological saline on naked back once per day, the low dose group was treated with the eye-patch on naked back for 15 min once per day, while the high dose group was treated for three times per day. Forty Hartley guinea pigs were randomly and equally divided into four groups for the muscle tone test： the normal control group was treated with physiological saline on naked back, the model group was treated without any medication, the low dose group was treated with the eye-patch on naked back for 10 min once per day, while the high dose group was treated for three times per day. All treatments were continued for 14 days until the termination of the test. The microcirculatory blood flow was observed by using a video-microscopy system. The histological sections were used to detect the microvascular regeneration by observing the expression of factor V$. The temperature changes on the skin surface were measured by using infrared thermometer, and the muscle tone was tested by the electromyography. Results： In compare with the normal or the model group, the improvement in the skin microcirculation and the blood vascular regeneration, and the decreasing in the muscle tone in low dose and high dose groups were statistically significant with confident level at P〈0.05. Conclusions： The eye-patch with invigorating blood circulation and detoxification has great enhancement in blood vascular regeneration and skin microcirculation, and great improvement in the indexes for muscle tone. The study explains certain therapeutic efficacy and mechanism of the eye-patch and shows that it could reduce the symptoms for patients with asthenopia.