腺病毒介导的小鼠Flt3配体抗肝癌基因治疗的研究

目的　观察腺病毒载体介导的小鼠Flt3配体 (mFL)对小鼠肝癌的基因治疗效果。方法　腺病毒体外感染小鼠肝癌细胞株Hepa1 6 ,4 8h后 ,用绿色荧光蛋白的表达检测感染的效率 ,ELISA检测培养上清中mFL的表达量 ,每天细胞计数 (连续 14d)观察细胞的生长曲线。建立小鼠肝癌模型 ,肿瘤局部分别单次注射 1× 10 9表达形成单位的mFL重组腺病毒、空载体对照和PBS ,观察肿瘤大小和小鼠生存期。治疗 2 0d后 ,取肿瘤消退小鼠的脾细胞过继至正常小鼠 ,3d后接种Hepa1 6细胞 ,观察肿瘤大小 ;治疗 38d后 ,再接种Hepa1 6细胞或EL4细胞对照于肿瘤消退小鼠原接种部位的对侧 ,观察肿瘤大小并作统计学处理。结果　腺病毒体外能有效地感染靶细胞Hepa1 6 ,培养上清中mFL表达量为 80 .5ng·10 -6·2 4h-1± 7.3ng·10 -6·2 4h-1,感染后Hepa1 6的生长未受到明显抑制。瘤体内注射mFL重组腺病毒导致 90 %的小鼠肿瘤消退 ,并显著延长小鼠生存期 ;脾细胞过继能保护正常小鼠免于Hepa1 6细胞的攻击 ;再接种Hepa1 6细胞于肿瘤消退小鼠 ,未见肿瘤生长 ,而再接种的EL4细胞呈渐进性生长 ,与对照组无显著差异。结论　腺病毒介导的小鼠Flt3配体的基因治疗导致肿瘤消退 ,并能激发可过继的、特异性免疫保护反应 ,可能成为有效的肝癌基因治疗的候     

Flt3配体重组腺病毒感染胃癌细胞的体外研究

目的 研究Flt3配体重组腺病毒(AdmFL)体外感染前小鼠前胃癌细胞的情况。方法 体外分别以不同MOI(mutiplicity of infection)的AdmFL感染胃癌细胞,荧光显微镜下计算感染率,对体外感染后的胃癌细胞连续计数并绘制生长曲线,RT-PCR检测转染后的细胞内mRNA表达,ELISA法检测培养上清中mFl蛋白的浓度。结果 MOI为10、100、500的AdmFL感染小鼠胃癌细胞,荧光显微镜下2 d后根据GFP的表达计算的感染率分别是5％、60％和98％;以MOI为100的AdmFL对体外感染后的胃癌细胞无直接的生长抑制作用;在感染后的胃癌细胞内RT-PCR扩增到了mFL的mRNA,ELISA法检测到mFL蛋白的浓度为60.3±5.2 ng／ml。结论 Flt3配体重组腺病毒能有效地感染小鼠前胃癌细胞,并能介导所携带的mFL高效表达。     

小鼠MIP1-α重组腺病毒载体的构建及其在肝癌细胞中的表达

目的:构建小鼠趋化因子MIP1-α(mMIP1-α)的重组腺病毒载体并在小鼠肝癌细胞中表达,为肝癌基因治疗提供实验基础.方法:PCR扩增含有mMIP1-α的质粒,将腺病毒骨架质粒pAdEasy-1以及线性化的重组穿梭质粒pTrack-CMV- mMIP1-α共转化BJ5183受体菌并在其中发生同源重组,利用重组前后抗性的改变筛选出重组子,重组腺病毒质粒经过293细胞的包装、扩增和纯化后,感染小鼠肝癌细胞株Hepa1-6,一步法提取细胞总RNA,RT-PCR检测mMIP1-α的mRNA.琼脂糖凝胶打孔法体外观察感染上清中mMIP1-α对小鼠脾细胞的趋化活性.结果:得到了携带mMIP1-α的重组腺病毒,纯化后滴度为4×1011 efu/ml,在感染后的Hepa1-6细胞中检测到mMIP1-α的表达,上清中mMIP1-α的趋化指数为6.3.结论:成功地构建了携带mMIP1-α的重组腺病毒载体,为下一步应用于肝癌的基因治疗提供了基础.     

巨噬细胞炎症蛋白1α修饰的小鼠肺癌疫苗的制备及体内抗肿瘤活性研究

目的以小鼠趋化因子巨噬细胞炎症蛋白1α(MIP-1α)的重组腺病毒载体(AdmMIP-1α)体外感染小鼠Lewis肺癌细胞株(LLC),观察其体内抗肿瘤活性,探讨其成为肺癌疫苗的可能性。方法AdmMIP-1α体外感染LLC细胞,通过绿色荧光蛋白(GFP)的表达检测感染率。连续14 d隔天进行细胞计数,观察细胞的体外生长曲线。取3×106修饰后的LLC细胞接种于C57BL／6小鼠,4周后在MIP-1α瘤苗组未荷瘤小鼠原接种部位的对侧再接种1×106野生型LLC或小鼠淋巴瘤细胞株(EL4)细胞。观察肿瘤体积。结果AdmMIP-1α能有效感染靶细胞LLC细胞,感染后LLC细胞的体外生长无明显改变。修饰后LLC细胞的体内成瘤性下降;4周后再接种LLC细胞,肿瘤生长速度明显减慢;而再接种的EL4细胞呈渐进性生长,与对照组无明显差异。结论表达MIP-1α基因的LLC细胞的体内成瘤性下降,并且能激发特异性免疫保护反应,有可能成为有效的肺癌疫苗。     

分泌mMIP-1α趋化因子的小鼠肝癌细胞株的建立及其体内致瘤性

目的：建立分泌mMIP-1α的小鼠肝癌细胞株,并观察其体内致瘤性。方法：mMIP-1αcDNA被克隆入pBabe puro逆转录病毒载体,构建的重组逆转录病毒载体pBabe-puro-mMIP-1α转染包装细胞,嘌呤酶素抗性细胞培养上清感染小鼠肝癌细胞系Hepa1－6,RT－PCR和免疫组化分别检测Hepa1-6,Hepa1-6-mMIP-1α的mMIP-1αmRNA和mMIP-1α蛋白折表达。绘制Hepa1-6-mMIP-1α与Hepal1-6手长曲线观察细胞的生长,琼脂糖凝胶打孔法体外观察Hepa1-6-mMIP-1α分泌蛋白对小鼠脾细胞的趋化作用。观察Hepa1-6-mMIP-1α体内瘤性。结果：构建了重组逆转录病毒载体pBabe puro-mMIP-1α,Hepa1-6不表达mMIP-1αmRNA及蛋白,Hepa1-6-mMIP-1α表达mMIP-1αmRNA和蛋白。Hepa1-6-mMIP-1α与Hepa1-6的生长曲线基本一样,Hepa1-6-mMIP-1α分泌了对小鼠脾细胞有趋化作用的分子。Hepa1-6-mMIP-1α体内致瘤性降低。结论：Hepa1-6-mMIP-1α能产生mMIP-1α,mMIP-1α分泌了对小鼠脾细胞有趋化作用的分子。Hepa1-6-mMIP-1α体内致瘤性降低。结论：Hepa1-6-mMIP-1α能产生mMIP-1α,mMIP-1α不改变细胞体外生长状况,嫌生的mMIP-1α有趋化活性,mMIP-1α能使Hepa1-6-mMIP-1α致瘤性降低。     

甲胎蛋白基因转录调控元件驱动白细胞介素-2基因在肝癌细胞中的特异性表达

目的利用小鼠甲胎蛋白(AFP)基因转录调控元件驱动白细胞介素-2(IL-2)基因在肝癌细胞中特异性表达.方法构建逆转录病毒载体pDOR-mAFP-IL-2,采用经包装后的病毒分别感染AFP阳性的小鼠肝癌细胞Hepa1-6和AFP阴性的小鼠ψ2细胞,检测IL-2表达.结果该载体能使IL-2基因在Hepa1-6细胞中特异性表达而不能在ψ2细胞中表达.结论采用具有肝癌特异性活性的AFP基因转录调控元件可以驱动IL-2基因在肝癌细胞中特异性表达,为进一步开展直接体内靶向性肝癌基因治疗实验研究提供了依据.     

pcDNA3-MAGE-1真核表达载体的构建及其在Hepal-6细胞中的稳定表达

目的:构建真核表达载体,并在小鼠肝癌Hepa1-6细胞中稳定表达,观察转染细胞的增殖能力和致瘤能力。方法:用PCR方法扩增SMMC-7721人肝癌细胞株MAGE-1全长序列,连接到真核表达载体pcDNA3中,构建真核表达pcDNA3-MAGE-1,脂质体法转染小鼠Hepa1-6细胞。G418筛选阳性克隆(Hepa1-6- MAGE-1),用RT-PCR和Western blotting检测阳性克隆中mRNA和蛋白质的表达;MTT 法检测Hepa1-6细胞和Hepa1-6- MAGE-1细胞生长和增殖的变化;分别以Hepa1-6细胞和Hepa1-6- MAGE-1细胞接种于C57BL /6j小鼠右侧背部皮下,观察Hepa1-6- MAGE-1细胞的致瘤能力。结果:构建MAGE-1的真核表达载体转染Hepa1-6细胞,PT-PCR与Western boltting检测分别在Hepa1-6- MAGE-1细胞中检测到人MAGE-1基因的mNRA和蛋白质的表达,两组细胞增殖无统计学差异;两组各10只小鼠均皮下成瘤,且肿瘤大小没有明显差异。结论:成功构建了真核表达载体pcDNA3-MAGE-1,获得了稳定表达人MAGE-1基因的小鼠肝癌Hepa1-6细胞株,并具有很好的增殖和致瘤能力。     

MafA基因重组腺病毒的构建及其对小鼠肝癌细胞的影响

目的利用AdEasy-1系统构建胰岛素转录因子之一的MafA基因重组腺病毒（Ad-MafA）,并观察其对小鼠肝癌细胞的影响。方法将质粒cDNA3/MafA扩增、酶切获得MafADNA片段插入腺病毒穿梭载体质粒pAdTrack-CMV的巨细胞病毒（CMV）启动子下游,构建重组穿梭载体pAdTrack-CMV-MafA,线性化后与骨架载体AdEasy-1在细菌BJ5183内同源重组得到腺病毒质粒pAd-MafA,经293细胞包装后得到含MafA全长DNA片段的重组腺病毒AdMafA;将Ad-MafA体外感染小鼠肝癌细胞（Hepa1-6）,以RT-PCR和Westernblot检测MafA在hepa1-6细胞的表达。结果连接、重组后通过酶切法筛选出pAd-MafA,经293细胞包装,5d后观察到绿色荧光蛋白（GFP）明显表达,通过反复感染HEK细胞扩增得到高滴度的重组腺病毒,Ad-MafA体外感染肝癌细胞1d后,MafA基因表达和蛋白表达明显增加。结论利用新型腺病毒载体AdEasy-1系统可在短期内制备同时表达GFP和MafA的重组腺病毒（Ad-MafA）,Ad-MafA体外感染小鼠肝癌细胞可显著提高MafA的表达,这将为基因治疗糖尿病提供新的手段。     

人膜连蛋白A2基因重组慢病毒载体的构建及其在肝癌细胞株中的表达

目的:构建重组慢病毒载体pWPT-ANXA2-Flag,并检测其在小鼠肝癌细胞系Hepa 1-6的表达情况。方法:利用DNA重组技术将人膜连蛋白A2(annexin A2,ANXA2)基因克隆入慢病毒表达载体pWPT中,通过酶切、测序验证后,将重组慢病毒载体pWPT-ANXA2-Flag与包装质粒pCMV-dR8.91、pCMV-VSV-G共转染人胚肾上皮细胞株293T,包装重组慢病毒LV-ANXA2-Flag,并感染小鼠肝癌细胞株Hepa 1-6,用RT-PCR检测ANXA2 mRNA转录水平,Western blot法检测ANXA2-Flag蛋白的表达情况,应用流式细胞仪检测细胞周期的变化。结果:经酶切及测序结果证实,构建了重组慢病毒载体pWPT-ANXA2-Flag;RT-PCR及Western blot结果显示慢病毒感染Hepa 1-6细胞后,ANXA2基因能够在细胞内正确的转录、翻译并稳定表达ANXA2蛋白;经过LV-ANXA2-Flag感染后,Hepa 1-6细胞S期细胞比例明显高于对照细胞。结论:成功建立ANXA2基因慢病毒表达载体pWPT-ANXA2-Flag,包装的慢病毒能够成功感染小鼠肝癌...     

转4-1BBL基因小鼠肝癌细胞瘤苗体外诱导抗肿瘤免疫应答的研究

目的 :研究转 4 1BBL基因小鼠肝癌细胞疫苗体外诱导淋巴细胞特异性杀伤活性及刺激同系小鼠脾细胞产生细胞因子 (IL 2、TNF α和GM CSF)的能力 .方法 :采用脂质体介导法将真核表达质粒pCDNA3.1(+) m4 1BBL导入小鼠肝癌细胞Hepa1 6 ,经G4 18筛选后获得稳定高表达克隆 ,以丝裂霉素C(MMC)处理后 ,制成肿瘤细胞疫苗 (TCV) ,经体外与同系小鼠脾淋巴细胞共同培养后 ,测定淋巴细胞特异性杀伤活性及对脾细胞产生细胞因子 (IL 2、TNF α和GM CSF)的影响 .结果 :转染 4 1BBL的Hepa1 6细胞能够高表达 4 1BBL蛋白 ,并且经MMC处理后制成的瘤苗在培养 4 8h仍能表达m4 1BBL .与野生型的Hepa1 6细胞相比 ,上述瘤苗能诱导淋巴细胞产生针对亲本的小鼠肝癌细胞Hepa1 6的特异性杀伤作用 (P <0 .0 5 ) ,但是对于小鼠肝癌细胞H2 2及成纤维细胞NIH3T3无效 ;此瘤苗在体外能显著增强脾细胞分泌细胞因子IL 2、TNF α和GM CSF的能力 .结论 :转 4 1BBL基因小鼠肝癌细胞疫苗能诱导有效的抗肝癌免疫反应 .     

Value of D-Dimers in patients with acute aortic dissection

Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P ＜ 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (＞0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P ＜0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P ＜ 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.     

Research of combined liver-kidney transplantation model in rats

Objective： To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods： SD rats served as both donors and recipients. 4℃ sodium lactate Ringer＇s was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava （IVC） inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results： Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion： This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P＜ 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P＜ 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

目的：评价使用安心颗粒对急诊经皮冠状动脉介入术（PPCI）术后生活质量的影响.方法：将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组（术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次）和对照组（仅接受基础药物治疗）.所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表（MIDAS）、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果：入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异（P＞0.05）;出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低（P＜0.05）;组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低（P＜0.05）.两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血（P＞0.05）.两组发生轻度血小板减少症的患者数比较无差异（P＞0.05）.结论：PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.     

The comparative studies of the influences of Urapidil and Nicardipine on sino-atrial node function, atrio-ventricular node function and hemodynamics

Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P＜0.01);the MAP decreased(P＜0.01)and the HR increased drastically(P＜0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.     

Expression of OPGmRNA and ODFmRNA in the patients of hip fracture due to osteoporosis

Objective：To investigate the gene expression of osteoprotegerin（OPG） and osteoclast differentiation factor（ODF） in the bone tissue of patients with hip fracture due to osteoporosis. Methods：OPGmRNA and ODFmRNA in the bone tissue in 50 cases of osteoporosis sufferers（over 50 years old） with hip fracture（Observer Group） and 30 cases of hip facture sufferers with no osteoporosis（Control group） were analyzed with the Semi-Quantitative RT-PCR method. Results：The mRNA expressed of ODF, OPG were both high in the patients with hip fracture. In the control group, the expression of OPG mRNA was observed, while the expression of ODF mRNA was very slight. Conclusion：Aged patients contained all signals including OPG, ODF that are essential for inducing osteoclastogenesis and promoting bone resorption.     

The clinicopathological and immuohistochemical analysis of solid-pseudopapillary tumor of the pancreas： report of 9 cases

Objective：To investigate the clinical features, pathological characteristics and immunophenotype of solid-pseudopapillary tumor of the pancreas（SPTP）. Methods：Nine surgically treated cases of SPTP were retrospectively reviewed. Hematoxylin and Eosin（HE） staining and immunohistochemical staining were used to analyze all cases, and the general clinical data was collected. Results：Six patients were asymptomatic except for a palpable mass. Two patients complained of vague-epigastric pain. One patient appeared jaundice. The tumor was encapsulated and solid tissues alternately with cystic tissues. Histologically, the histological structure of solid portion was pseudopapillary with a fibrovascular core. Tumor cells were uniform and medium-sized which were arranged in sheets ets or nests or pseudopapillary patterns. Immunohistochemical studies demonstrated that SPTP proved positive in vimentin（9/9 cases）, AAT（9/9 cases）, NSE（9/9 cases）, ACT（7/9 cases）, CK20（2/9 cases）, CgA（1/9 cases）, S-100（3/gcases）, PR（4/gcases）, Syn（3/9 cases） and CD56（5/9cases）, negative in CEA and ER. Conclusion：SPTP is a tumor predominantly occurring in young women frequently without special symptoms. This tumor has various characteristical histological patterns with different immunophenotype.     

Dynamic Changes in Serum Estradiol and Progesterone levels in Patients of Premenstrual Syndrome with Adverse Flow of Liver-qi

Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.     

Real-time Three-dimensional Echocardiography in Assessment of Left Ventricular and Right Ventricular Volumes

Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.     

SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.