ABSTRACT
<p><b>OBJECTIVE</b>To investigate the change of gastric cancer cell proliferation and the expression of gastric cancer related gene 213 (GCRG213), a long interspersed nuclear element-1 (LINE-1) endonuclease variant, during hypoxia.</p><p><b>METHODS</b>Normal gastric mucosa cell GES-1 and gastric cancer cell BGC-823 were cultured in 20% or 3% oxygen concentrations, respectively. MTT test was used to analyze the proliferation of the GES-1 and BGC-823 cells. The change of GCRG213 mRNA and protein expression in GES-1 and BGC-823 cells was detected by using RT-PCR and Western blot analysis. Blast was used at the NCBI Blast server to identify GCRG213 sequence to any alignment in the GeneBank databases.</p><p><b>RESULTS</b>Compared with 20% oxygen condition, 3% oxygen concentration could promote cell growth. Mean-while, the expression of GCRG213 at mRNA and protein levels was increased. GCRG213 sequence shared high homology with LINE-1 endonuclease sequence.</p><p><b>CONCLUSION</b>GCRG213 is a variant of LINE-1 endonuclease. Hypoxia as in 3% oxygen condition can promote cell proliferation and lead to GCRG213 overexpression.</p>
Subject(s)
Humans , Cell Line, Tumor , Cell Proliferation , Cells, Cultured , Deoxyribonuclease I , Genetics , Gastric Mucosa , Cell Biology , Gene Expression , Hypoxia , Peptide Hormones , Genetics , Stomach Neoplasms , Genetics , PathologyABSTRACT
<p><b>AIM</b>To identify up-regulated genes specific to human normal gastrointestinal tissues.</p><p><b>METHODS</b>Study was made on human normal tissue gene expression database open to the public. Tissue-specific genes were identified using one-tailed student T test. Online software including Ingenuity and KEGG were applied for physiological function analyses. Unsupervised two-way hierarchical clustering method was used to analyze the expression profile of stomach-specific genes in gastric cancer gene expression datasets.</p><p><b>RESULTS</b>The analyses identified 196 stomach-specific genes, 203 ileum-specific genes and 224 colon-specific genes, respectively. The gene expression profiles reflect major organ-specific physiological functions on the molecular level. Some putative oncogenes and tumor suppressor genes were found in the tissue-specific gene list. Hierarchical clustering analysis revealed that the stomach-specific genes were up-regulated in normal stomach tissues but down-regulated in stomach cancer tissues. The normal tissues clustered together, so did the cancer tissues. At the meantime, clustering could also distinguish the moderate and severe differentiated stomach cancer.</p><p><b>CONCLUSION</b>Human normal stomach, ileum and colon possess tissue-specific up-regulated genes, which are closely associated with physiological functions.</p>
Subject(s)
Humans , Cluster Analysis , Colon , Metabolism , Computational Biology , Databases, Genetic , Gastrointestinal Tract , Metabolism , Gene Expression Profiling , Gene Expression Regulation , Ileum , Metabolism , Stomach , Metabolism , Stomach Neoplasms , Genetics , TranscriptomeABSTRACT
<p><b>OBJECTIVE</b>To identify novel human gastric cancer-associated susceptibility gene for early diagnosis and treatment of gastric cancer.</p><p><b>METHODS</b>A primer was designed for 3'-rapid amplification of cDNA end(RACE) and amplified fragments were cloned, then they were analyzed by sequencing. Compared with ESTs in Genbank, the EST fragment represented a novel gene. Combination of Northern blot and virtual Northern and multiple tissues Northern blot, expression of the cDNA in multiple normal and carcinoma tissues were analyzed.</p><p><b>RESULTS</b>One of the important cDNA bands with poly(A) tail was cloned. This band was named W41. Sequence analysis showed that W41 consists of 533 bp. Basic local alignment search tool analysis revealed that W41 has low identity with any genes from GenBank. This sequence data was submitted to GenBank with accession No. AF 325202. Northern blot revealed that W41 presented higher expression in gastric cancer tissue than in normal tissue. Multiple tissue Northern blot revealed that W41 presented higher expression in multiple cancers than in normal tissues. Virtual Northern revealed that the cDNA presented higher expression in tumor series analysis of gene expression libraries than in normal.</p><p><b>CONCLUSION</b>A novel human gastric cancer-associated cDNA fragment was identified.</p>
Subject(s)
Female , Humans , Blotting, Northern , Cloning, Molecular , DNA, Complementary , Chemistry , Genetics , Gene Expression Regulation, Neoplastic , Genetic Predisposition to Disease , Genetics , HL-60 Cells , HeLa Cells , K562 Cells , Molecular Sequence Data , Sequence Analysis, DNA , Stomach Neoplasms , Genetics , Tumor Cells, CulturedABSTRACT
<p><b>OBJECTIVE</b>To analyze the expression of human anti-apoptotic gene survivin (SVV) in normal human gastric tissues and gastric cancer.</p><p><b>METHODS</b>SVV cDNA clone was obtained from human gastric cancer tissues by virtue of RT-PCR, using Dig-marked cRNA probe in situ hybridization to analyze its expression in normal human gastric tissues and gastric cancer.</p><p><b>RESULTS</b>Two SVV cDNA clones, SVV-S4A and SVV-S1B were obtained. The sequence of the former is identical to that of the well-known SVV cDNA; however, in the sequence of the latter, the third exon was missed, i.e., there are only two exons in SVV-S1B. In situ hybridization showed that SVV-S4A is mainly expressed in gastric cancer tissues whereas SVV-S1B is mostly expressed in normal gastric tissues.</p><p><b>CONCLUSION</b>There is difference between SVV-S4A and SVV-S1B in respect to their characteristics of expression in gastric cancer and normal gastric tissues.</p>