Effect of peroxisome proliferator-activated receptor γ agonist rosiglitazone on intestinal injury in rats undergoing orthotopic autologous liver transplantation by inhibiting inflammatory response

AIM: To investigate the effect of rosiglitazone, a peroxisome proliferators-activated receptor γ(PPARγ) agonist, on the expression of PPARγ, the activation of NF-κB and intestine injury in the rats undergoing orthotopic autologous liver transplantation(OALT).METHODS: Sprague-Dawley male rats were randomly divided into 4 groups:control group, sham group, OALT group and rosiglitazone(0.3 mg/kg, iv) pretreatment(ROS+OALT) group. The OALT model was established, and the intestinal tissues were collected 8 h after the liver reperfusion. The intestinal tissue sections were stained to visualize the damage. The expression of PPARγ and NF-κB in the tissues, the concentrations of diamine oxidase(DAO) and fatty acid-binding protein 2(FABP2) in the serum and the concentration of TNF-α and IL-6 in the tissues were measured.RESULTS: Compared with sham group, the intestinal mucosa of the rats showed obvious pathological injury after liver reperfusion in OALT group and ROS group, the Chiu,s scores of intestinal mucosa was significantly higher, and the serum concentrations of DAO and FABP2 increased(P<0.05). After rosiglitazone pretreatment, the injury of intestinal mucosa of the rats was alleviated, the Chiu,s scores was lower and the serum concentrations of DAO and FABP2 decreased(P<0.05), the PPARγ expression was obviously up-regulated in the intestinal tissues, the nuclear translocation of NF-κB was reduced and the concentrations of IL-6 and TNF-α were decreased.CONCLUSION: During perioperative period of OALT in rats, the inflammatory responses are obvious. Furthermore, obvious intestinal injury occurs. PPARγ agonist rosiglitazone obviously up-regulates PPARγ expression and inhibits the inflammation in the intestines, thus protecting against intestinal injury in rats undergoing OALT.     

陆地棉×亚洲棉F_0成胚频数与亲本主要产量性状配合力的关系

陆地棉×亚洲棉F_0成胚频数主要受母本陆地棉的影响,不同的7个陆地棉品种间存在着显著差异.成胚频数高的6901和朝阳1号,单铃子棉重、单铃种子数、子指一般配合力亦均高;而成胚频数低的6913和黑山棉,上述各性状的一般配合力也均低.在7个父本亚洲棉中,与陆地棉杂交当代成胚频数高的束鹿白花和完紫,其子指的一般配合力也较高.因此,选择单铃子棉重、单铃种子数、子指一般配合力较高的陆地棉作母本与子指一般配合力较高的亚洲棉作父本杂交,可以显著提高种间杂交当代的成胚频数.     

血管内皮生长因子及其受体在胚胎卵黄囊 不同发育时期的表达

为研究胚胎不同时期VEGF、KDR和CD34在人卵黄囊中的表达情况，了解胚胎造血的发育过程和机理。采用免疫组织化学SP法卵黄囊冰冻切片进行染色，光镜观察。结果发现在第3~4周的人卵黄囊低表达VEGF和KDR，不表达CD34。4~6周组强表达VEGF、KDR和CD34。在血岛内阳性细胞大而圆，成簇或分散聚集，有些细胞沿血岛边缘形成血管样结构。6周以后，卵黄囊弱表达VEGF、KDR和CD34。上述结果提示卵黄囊可表达造血和血管生成相关因子，随胚胎发育呈阶段性表达。卵黄囊中出现造血干细胞和血管内皮细胞的分化。     

应用国产激素进行奶牛超数排卵的研究

研究了国产激素(FSH)在使用方法、时间、剂量、配制比例等方面对奶牛超数排卵效果的影响,并对供体牛的年龄、胎次、产后日期,重复超排及季节、气候等各种因素在超数排卵效果方面进行了探讨。研究结果还表明国产FSH超排效果比较稳定。     

香樟试管苗移植技术研究

运用正交试验的方法研究炼苗时间、不同遮阳网遮光率以及不同基质对香樟试管苗移植效果的影响,结果表明:炼苗时间7 d,遮阳网遮光率60%,基质为木屑∶泥炭土(1∶1)对于香樟试管苗移植效果最佳。     

牛胚胎移植试验研究

本研究应用国产激素和器械对奶牛进行超数排卵，采用胚胎移植技术使黄牛繁殖奶牛。５ａ共超排供体牛１８５头，成功１５９头，成功率为８１．９５％；共获卵１２０１枚，头均７．５５±６．３７枚，其中可用胚胎８８０枚，头均５．６８±４．９６枚。同期发情处理受体牛２３６头，发情１３９头，发情率５８．９０％；鲜胚移植受体牛１７８头，受胎７８头，受胎率为４３，８２％，其中移植受体黄牛１４５头，受胎６１头，受胎率４２．０７％，移植受体奶牛３３头，受胎１７头，受胎率为５１．５２％；冷冻胚胎移植受体牛６１头，受胎２７头，受胎率为３７．７０％；５３胚胎移植产犊８５头。确立了应用国产激素垂体促卵泡素（ＦＳＨ）和前列腺素（ＰＧＧ＿（２２））诱发牛超数排卵和发情同期化处理的最佳程序和剂量，并总结出了采卵方法、胚胎鉴定、胚胎冷冻保存和移植等相应环节的技术规程。     

新鲜羊膜移植术治疗眼表烧伤晚期并发症的临床研究

目的：研究新鲜羊膜移植术治疗眼表烧伤晚期并发症的可行性、手术方法和临床效果。方法：眼表烧伤晚期病例18例(18眼)，其中角膜血管翳8例，角膜溃疡7例，睑球粘连3例，采用新鲜羊膜移植治疗。手术方法：单层与多层羊膜移植或联合眼睑成形，角膜缘干细胞移植术。术后随访6～12个月。结果：18例术后植片均未见急性排斥反应，术后4～6周稳定愈合；13眼视力有不同程度提高。18眼中有17眼治愈。结论：新鲜羊膜是治疗眼表烧伤晚期并发症的有效方法。     

一季晚稻直播栽培与育秧移栽的农艺性状比较

选用有代表性的水稻品种（组合）两优培九（两系杂交稻）、绵2优838（三系杂交稻）、湘晚籼11号（优质常规稻）、扬稻6号（高产常规稻）为试验材料，采用裂区设计，通过直播栽培与育秧移栽比较试验，研究不同水稻品种（组合）农艺性状、产量构成因素的差异．结果表明，两种栽培方式下各品种产量之间存在显著差异，直播栽培相比育秧移栽产量高；从产量构成因素上分析，直播栽培增产的原因是水稻有效穗数增多、结实事和千粒重略有增加，其中有效穗数对产量贡献最大，其直接通径系数为0．8677．直播栽培对水稻分蘖、株高、生育期及叶面积有一定影响．     

Factors Affecting the Efficiency of Embryonic Cell Nuclear Transfer in Rabbits

Factors affecting the efficiency of nuclear transfer （NT） in rabbits were examined in the present study. When 100 V mm of pulse strength and 15 us of pulse duration were employed, 3 and 4 electronic pulses resulted in significantly more cytoplasts fused with donor cells compared with 2 electronic pulses （P〈 0.05）, but no significant difference was found in the cleavage rate of reconstructed embryos among the three groups （P〉0.05）. When the duration and number of electronic pulse were fixed at 15 ps and 3 times, increase of pulse intensity from 100 V mm 1 to 150 V mm^-1 and 200 V mm^-1 resulted in a significantly decrease in the cleavage rate of reconstructed embryos （P〈 0.05）, although the fusion rate did not significantly differ among the three groups （P〉 0.05）. Significantly more reconstructed embryos cleaved and developed to blastocysts when they were derived from donor embryos at the 8-16-cell stage, in comparison with the reconstructed embryos derived from donor embryos at the compact morula stage （P 〈 0.05）, although the fusion rate was similar （P 〉 0.05）. Activation of cytoplasts prior to fusion increased the cleavage rate （P〈 0.05） and blastocyst development （P〈 0.05） of reconstructed embryos, but decreased the fusion rate （P 〈 0.05） compared with cytoplasts activated post fusion. More reconstructed embryos developed to blastocysts when they were cultured in TCM ＋ 3% OCS at the first 48 h and then cultured in TCM199＋ 10% FCS, in comparison with the reconstructed embryos cultured in either TCM199＋ 10% FCS or TCM199＋3% OCS （P 〈 0.05）. When 22 NT embryos were transferred into the oviducts of one recipient rabbit, one recipient rabbit delivered a female rabbit at 34 days of gestation. In conclusion, either electrofusion parameter or developmental stage of donor embryos have a significant effect on the efficiency of NT, NT embryos require different concentration of serum at their different development stages.     

家兔胚胎细胞核移植的研究

兔超排后收集卵母细胞和１６细胞胚，以Ｍｃ－Ｇｒａｔｈ－Ｓｏｌｔｅｒ和Ｗｉｌｌａｄｓｅｎ两种去（注）核方法，将１６细胞胚细胞核经电融合植入去核成熟卵母细胞内，经体外培养或中间受体培养，使移核胚发育．结果表明：（１）兔胚核移植中上述两种去（注）法的成功率无差异；（２）ｈｃＧ注射后１３～１５ｈ，６７．８％的卵母细胞保留有第一极体；（３）强度为０．６３ｋＶ／ｃｍ，持续１６０μｓ的一次电脉冲可使７０．８％的注核胚融合，同样的电脉冲刺激卵母细胞的活化率为６１．１％；（４）兔移核胚在中间受体内或体外均可发育，在中间受体内有２３．０％可以发育到桑椹胚或囊胚．