A novel full-length gene of human ribosomal protein L14.22 related to human glioma

Background This study was undertaken to obtain differentially expressed genes related to human glioma by cDNA microarray and the characterization of a novel full-length gene. Methods Total RNA was extracted from human glioma and normal brain tissues, and mRNA was used as a probe. The results of hybridization procedure were scanned with the computer system. The gene named 507E08 clone was subsequently analyzed by northern blot, bioinformatic approach, and protein expression. Results Fifteen differentially expressed genes were obtained from human glioma by hybridization and scanning for four times. Northern blot analysis confirmed that the 507E08 clone was low expressed in human brain tissue and over expressed in human glioma tissues. The analysis of BLASTn and BLASTx showed that the 507E08 clone was a novel full-length gene, which codes 203 amino acid of protein and is called human ribosomal protein 14.22 gene. The nucleotide sequence had been submitted to the GenBank?with the accession number of AF329277. After expression in E.coli., protein yielded a major band of apparent molecular mass 22 kDa on an SDS-PAGE gel. Conclusions cDNA microarray technology can be successfully used to identify differentially expressed genes. The novel full-length gene of human ribosomal protein 14.22 may be correlated with the development of human glioma.     

Biological function of a novel gene overexpressed in human hepatocellular carcinoma

Objective To clone the full-length of a differentially expressed cDNA fragment, LC27, and study its biological function tentatively. Methods Northern blot was used to analyze the expression pattern of LC27 in hepatocellular carcinoma, matched nontumor liver tissues, fetal liver and normal adult liver tissues, as well as BEL-7402 hepatocellular carcinoma cell line ESTs splicing and 5’ rapid amplification of cDNA ends (5’ RACE) were used to clone the full-length of LC27 cDNA.An antisense oligodeoxynucleotide approach was used to investigate the biological role of the gene in the proliferation of BEL-7402 cells. Results A 2186 bp novel cDNA with an open reading frame encoding a 283 amino acid protein was cloned.Analysis of the deduced amino acid sequence indicated that it is 38% (88/229) identical to human Golgi 4-transmembrane spanning transporter MTP.The gene and the encoded protein was termed hepatocellular carcinoma overexpressed transmembrane protein (hotp) and HOTP, respectively.Hotp mRNA was almost undetectable in normal adult liver and fetal liver tissues.However, it was significantly up-regulated in hepatocellular carcinoma and some matched nontumor liver tissues, as well as BEL-7402 cells.The proliferation of BEL-7402 cells was suppressed by an antisense oligodeoxynucleotide against hotp mRNA at a concentration of 50 μg/ml. Conclusion HOTP may be an integral membrane transporter protein.The overexpression of the gene in hepatocellular carcinoma may play an important role in hepatocarcinogenesis and disease progression.     

Expression of Twist Gene in Primary Liver Cancer

In order to investigate the possibility of overexpression of Twist in primary liver cancer （PLC）, the Twist expression was detected by using immunohistochemical analysis and RT-PCR assay in 45 patients with PLC. Control tissues were obtained from 9 patients with liver hemangioma. It was found that in 36 （80.0%） out of 45 PLC patients, cancerous regions showed positive cytoplasm and nucleus staining for Twist with a diffuse pattern. In noncancerous adjacent areas and control liver tissues, the expression of Twist was 57.8% and 22.2% respectively. The results of RT-PCR assay revealed that the expression of Twist was stronger in the cancerous tissues than that in the noncancerous adjacent tissues. It was suggested that the expression of Twist was up-regulated in PLC, which play an important role in the progression of PLC.     

Studies on P_1 , P_2 Protamine mRNA in Sperms of Human, Rat and Mouse

Objective To investigate the existence of the protamine mRNA in sperms of human, rat and mouse. Methods By means of RT-PCR technique, protamine cDNA fragments were obtained from total RNA of the mature sperms of human, rat and mouse respectively. Results mRNA of protamine gene was found in the mature sperm of human, rat and mouse. The protamine cDNA with an abnormal head obtained by PT-TCR in rat sperm was much less in number than that in the normal rat sperm. Conclusion mRNA in the sperms might represent the condition of corresponding gene expression during spermatogenesis.     

Study on Amino Acid Composition of HSP70 and the Level of Plasma Free Amino Acids of Workers with Long-term Exposure to Harmful factors

In order to know the practical value of heat stress protein 70 (HSP70) and to know the changes of plasma free amino acids of workers with the induction of HSP70 by harmful factors, the amino acid composition of major HSP, HSP70 purified from the heated cultured human leukemia cancer cell line K562, rabbit liver, rat liver and heart, and mouse liver with two-step procedures of DE52-cellulose ion exchange chromatography and affinity chromatography on ATP-agarose was examined. The level of plasma free amino acids of workers with long-term exposure to heat, carbon monoxide and the combined effect of both heat and car bon monoxide was also investigated. The results showed that the three richest amino acids in HSP70 of all origins were Gly, Glu and Asp, except that of rat heart which was rich in Gly, Phe and Glu. Additionally, Lys, Val, Leu and Ala were also found very rich in HSP70 of all origins. Compared with controls, the most of plasma free amino acids tended to increase and free methionine and tryptophan     

Effect of Radix lsatidis on the Expression of Moesin mRNA Induced by LPS in the Tissues of Mice

To investigate the effect of the anti-endotoxic part of Radix Isatidis on the expression of moesin mRNA in murine tissues induced by lipopolysaccharide （LPS）, the sample solution of F0z2 part from Radix Isatidis was intrapefitoneally administered to experimental mice, and the lipopolysaccharide （LPS） were injected into the tail vein, and then the tissues of liver, kidney and spleen were colleted and cut into slices. The mRNA was detected by moesin mRNA hybridization in situ. The staining results were observed under microscope. It was found that moesin mRNA expression was increased in the tissues of liver, kidndy and spleen in mice treated with LPS, while in the mice pre-treated with F022 part from Radix Isatidis, the LPS-induced moesin mRNA expressions in these tissues were inhibited in a dose-dependant manner. Our study showed that F022 part from Radix Isatidis can inhibit the LPS-induced expression of moesin mRNA in the tissues of liver, kidney and spleen in mice.     

Effect of Radix Isatidis on the Expression of Moesin mRNA Induced by LPS in the Tissues of Mice

To investigate the effect of the anti-endotoxic part of Radix Isatidis on the expression of moesin mRNA in murine tissues induced by lipopolysaccharide (LPS), the sample solution of F022 part from Radix Isatidis was intraperitoneally administered to experimental mice, and the lipopoly- saccharide (LPS) were injected into the tail vein, and then the tissues of liver, kidney and spleen were colleted and cut into slices. The mRNA was detected by moesin mRNA hybridization in situ. The staining results were observed under microscope. It was found that moesin mRNA expression was increased in the tissues of liver, kidndy and spleen in mice treated with LPS, while in the mice pre-treated with F022 part from Radix Isatidis, the LPS-induced moesin mRNA expressions in these tissues were inhibited in a dose-dependant manner. Our study showed that F022 part from Radix Isati- dis can inhibit the LPS-induced expression of moesin mRNA in the tissues of liver, kidney and spleen in mice.     

Expressions of Nucleoside Diphosphate Kinase （nm23） in Tumor Tissues are Related with Metastasis and Length of Survival of Patients with Hepatocellular Carcinoma

Objective To evaluate the relationship of expressions of nucleoside diphosphate kinase （nm23） and proliferating cell nuclear antigen （PCNA）, as well as apoptosis, with the prognosis of HCC patients by analyzing their pathological and clinical data. Methods The expressions of nm23 and PCNA were analyzed by immunohistochemistry and the apoptotic phenomena were detected by TUNEL technique in the liver samples from 43 HCC tissues, 39 para-neoplastic tissues, and 10 normal tissues. The mean apoptosis index （AI） and proliferative index （PI） in individual sample were calculated. Results As shown by the detection, 32.6% of carcinomas had negative nm23 signal in tumor tissues, whereas all para-neoplastic and normal tissues had positive nm23. The AI in nm23 positive HCC was significantly higher than that in nm23 negative one, with statistical difference （P0.05）. Furthermore, the expressions of nm23, and the values of AI and PI were contrastively analyzed with some main pathological and clinical data of HCC. It revealed that HCC with extrahepatic metastasis showed remarkable correlation with the negative nm23 （P=0.013） and higher PI values of HCC （P=0.015）. The disease-free survival in HCC patients with negative nm23 expression was significantly poorer than that in patients with positive nm23 expression. Conclusion These data suggest that expressions of nm23 protein in tumor tissues are correlated with occurrences of metastasis and length of survival of the HCC patients, which may be an indicator for their prognosis.     

树鼩卵磷脂胆固醇酰基转移酶cDNA和蛋白质序列结构分析

目的克隆获得树鼩卵磷脂胆固醇酰基转移酶cDNA序列并进行结构分析。方法以树鼩肝脏mRNA逆转录出的Ⅰ链cDNA为模板,运用SMARTRACEPCR扩增技术,扩增得到树鼩卵磷脂胆固醇酰基转移酶(LCAT)cDNA序列,并推导出LCAT氨基酸序列。利用分子生物学软件DNAMAN对氨基酸序列的一、二级结构及主要结构域进行分析和比较。结果树鼩LCATcDNA序列由1340个核苷酸构成,开放阅读框架1320bp,编码440个氨基酸的LCAT前体(含24个氨基酸构成的信号肽和416个氨基酸组成的成熟蛋白)熏3'非翻译区18bp,终止密码TAA,加尾信号AATAAA和一个25bp的poly(A)尾。树鼩LCATcDNA序列已作为新基因被GenBank接受,登记号AF272861。树鼩与人和狒狒LCATcDNA的同源性分别为90%和89%。结论树鼩LCATcDNA序列与人及其他实验动物高度同源。     

树Qu胆固醇酯转运蛋白的cDNA和蛋白质结构分析

目的 获得不易感动脉粥样硬化动物树Qu胆固醇酯转运蛋白（CETP）的cDNA和蛋白质序列,分析其结构特点,寻找其可能的抗动脉粥样硬化分子机制。方法 以从树Qu肝脏mRNA反转录获得的cDNA一链为模板,应用SMART－RACE技术,获得了树QuCETP的cDNA序列,并推导出其蛋白质氨基酸序列,应用分子生物学软件对该蛋白的一级、二级结构进行分析和比较。结果 获得的树QuCETP cDNA（在GenBank中的注册号为AF334033）长1636bp,编码485个氨基酸,其成熟蛋白由477个氨基酸组成,比人多一个氨基酸（Gly318),该蛋白与人、家兔的同源性分别为88％和82％。序列中与CETP结合和转运中性脂质功能相关的区域均非常保守,但在Asm342位的N－糖基化位点缺失,可能使其转运胆固醇酯的活性增加,利于外周组织和血浆中的胆固醇及其酯的清除。通过对不同种属蛋白序列的比较,初步分析了树QuCETP蛋白与功能相关的结构特点。结论 树QuCETP糖基化的特点有可能是该动物对动脉粥样硬化具有不易感性的分子机理之一。     

树Ju载脂蛋白AIcDNA的克隆及其组织表达

克隆不易感动脉粥样硬化动物树Ｊｕ（ｔｒｅｅｓｈｒｅｗ,ＴＳ）载脂蛋白Ａ－Ｉ（ａｐｏｌｉｐｏｐｒｏｔｅｉｎＡＩ,ａｐｏＡＩ）的基因,比较分析其结构特点,方法以提取的肝组织ｍＲＮＡ为模板,反转录构建了ＴＳ肝组织ｃＤＮＡ文库。利用制备的兔抗ＴＳ载脂蛋白ＡＩ多抗血清为探针筛选该文库,对阳性克隆进行测序,序列分析及组织表达实验。结果克隆获得了ＴＳａｐｏＡＩｃＤＮＡ序列,全长序列由９００个核苷酸构成,包括２８     

树鼩中APP基因特征描述及可变剪接体的分型鉴定

目的 区分并鉴定树鼩中APP基因mRNA的多种可变剪接体,对APP基因特征进行描述,并确定其在各组织中的表达分布。方法 参考已知人的和树鼩基因组预测的APP基因序列,设计树鼩APP基因mRNA剪切体外显子的共同特异性引物。分别从树鼩不同组织中提取总RNA,反转录为cDNA,利用高保真酶扩增目的剪切体DNA。根据PCR扩增产物电泳条带的有无和大小初步判断剪接体的型别,最后将PCR产物胶回收进行测序鉴定,对获得的基因进行特征描述,并结合定量PCR的结果确定了各剪接体在不同组织中分布情况。结果 结果表明树鼩APP剪接体的全长为3514 bp,有一个109 bp的5''-UTR,1092bp的3''-UTP。APP基因在调查的9个物种中高度同源保守,显示树鼩与灵长类存在一个较近的亲缘关系。通过三维建模获得了树鼩和人的APP基因共同拥有的4个结构域。同时确认这4种通过外显子跳跃产生的APP可变剪接体在不同组织中的分布和表达。4种检测到的剪接体APP770,APP695,APP751,APP677均表达于肺、肾和肠,表达量最高的是肺、肌肉和睾丸。结论 对树鼩APP基因可变剪接体的表达研究,有助于推动树鼩作为阿尔茨海默病模型深入研究疾病的发生机制和药物研发。     

北京鸭载脂蛋白AI cDNA的克隆及其组织表达

目的:克隆不易感动脉粥样硬化动物北京鸭载脂蛋白AI的基因。方法:分离提取北京鸭肝组织mRNA,以此为模板,反转录构建了鸭肝组织cDNA文库。利用制备的兔抗鸭载脂蛋白AI(apoAI)多抗血清为探针筛选该文库,获得10个阳性克隆,测序及序列分析。结果:包括18bp、240bp组成的5’和3’非翻译区,792bp组成的一个完整开放阅读框架,编码264个氨基酸的鸭apoAI前体,含18个氨基酸构成的信号肽、6个氨基酸的原肽片段和240肽的成熟蛋白。推译出的成熟肽与鸭apoAI氨基酸的直接测序结果完全一致。该新基因已被GenBank接受。Northern blot显示鸭apoAI mRNA不仅主要在肝和小肠组织表达;而且不同于人和哺乳类动物,亦可少量在脑、肾、肌肉组织分布。结论:结果为进一步研究不易感动脉粥样硬化动物北京鸭apoAI基因组结构、功能及其抗动脉硬化机制奠定了基础。     

树鼩载脂蛋白AI cDNA的克隆及其组织表达

目的克隆不易感动脉粥样硬化动物树（ｔｒｅｅｓｈｒｅｗ,ＴＳ）载脂蛋白ＡＩ（ａｐｏｌｉｐｏｐｒｏｔｅｉｎＡＩ,ａｐｏＡＩ）的基因,比较分析其结构特点。方法以提取的肝组织ｍＲＮＡ为模板,反转录构建了ＴＳ肝组织ｃＤＮＡ文库。利用制备的兔抗ＴＳ载脂蛋白ＡＩ多抗血清为探针筛选该文库,对阳性克隆进行测序、序列分析及组织表达实验。结果克隆获得了ＴＳａｐｏＡＩｃＤＮＡ序列,全长序列由９００个核苷酸构成,包括２８ｂｐ组成的５′非翻译区;７９５ｂｐ组成的一个完整开放阅读框架,编码翻译２６５个氨基酸的ＴＳａｐｏＡＩ前体（含１８个氨基酸构成的信号肽、６个氨基酸的原肽片段及２４１肽的成熟蛋白）;两个终止密码ＴＧＡ、ＴＡＡ和随后７２ｂｐ的３′非翻译区。新基因已被ＧｅｎＢａｎｋ接受。对编码蛋白质的亲疏水性分析表明ＴＳａｐｏＡＩ的疏水性强于人的相应蛋白。Ｎｏｒｔｈｅｒｎｂｌｏｔ显示ＴＳａｐｏＡＩ基因主要在肝脏和小肠组织表达。结论获得了不易感动脉粥样硬化动物ＴＳａｐｏＡＩ的新基因,编码的蛋白质结合胆固醇及胆固醇酯的能力可能大于人的ａｐｏＡＩ。     

HP8: The cDNA clone of a novel member of C/EBP gene family

ＨＰ８：ＴｈｅｃＤＮＡｃｌｏｎｅｏｆａｎｏｖｅｌｍｅｍｂｅｒｏｆＣ／ＥＢＰｇｅｎｅｆａｍｉｌｙ￥（徐砺新）（万大方）（刘彦仿）（李宏年）（张萍萍）（隋延仿）（顾健人）ＸｕＬｉｘｉｎ，ＷａｎＤａｆａｎｇ，ＬｉｕＹａｎｆａｎｇ，ＬｉＨｏｎｇｎｉａｎ，Ｚｈ...     

HCV感染树鼩模型中腹部横切手术及肝门静脉注射新方法的建立

目的采用腹部横切手术及肝门静脉注射法将丙型肝炎病毒（hepatitis c virus,HCV）迅速足量注射接种到树鼩体内肝脏,提高HCV对树购的感染率。方法采用横切打开树购腹腔,找到肝门静脉,进行肝门静脉注射接种HCV,手术后1周进行采血、ALT检测、HCV病毒载量检测、肝脏病理检测及HCV-RNA抗原检测。结果横切手术及肝门静脉注射20只树鼩,手术后经护理恢复,树购伤口恢复良好,手术成功率及肝门静脉注射准确率均达100％,保证HCV完全快速进入树鼩肝脏。有60％（12／20）树鼩出现一过性的病毒血症或间歇性病毒血症,感染树鼩的病毒载量最高可达到1×10^5拷贝／mL,肝功能中ALT指标最高可达到192μ／L,肝脏活体组织病理检查发现不同程度的肝炎症状,肝组织能检测到HCV-RNA抗原。结论腹部横切具有充分暴露肝门静脉、操作方便、符合解剖生理、组织创伤较小、伤口易于愈合等优点,适用于肝门静脉注射,同时提高了感染率,该技术方法为进一步深入研究HCV感染树鼩奠定基础,对于其它相关实验动物和动物实验具有一定借鉴经验和参考价值。