Analysis of gene expression profile of pancreatic carcinoma using cDNA microarray.
OBJECTIVE
To identify new diagnostic markers and drug targets, the gene expression profiles of pancreatic cancer were compared with that of adjacent normal tissues utilizing cDNA microarray analysis.


METHODS
cDNA probes were prepared by labeling mRNA from samples of six pancreatic carcinoma tissues with Cy5-dUTP and mRNA from adjacent normal tissues with Cy3-dUTP respectively through reverse transcription. The mixed probes of each sample were then hybridized with 12 800 cDNA arrays (12 648 unique human cDNA sequences), and the fluorescent signals were scanned by ScanArray 3 000 scanner (General Scanning, Inc.). The values of Cy5-dUTP and Cy3-dUTP on each spot were analyzed and calculated by ImaGene 3.0 software (BioDiscovery, Inc.). Differentially expressed genes were screened according to the criterion that the absolute value of natural logarithm of the ratio of Cy5-dUTP to Cy3-dUTP was greater-than 0.69.


RESULTS
Among 6 samples investigated, 301 genes, which accounted for 2.38 % of genes on the microarry slides, exhibited differentially expression at least in 5. There were 166 over-expressed genes including 136 having been registered in Genebank, and 135 under-expressed genes including 79 in Genebank in cancerous tissues.


CONCLUSIONS
Microarray analysis may provide invaluable information on disease pathology, progression, resistance to treatment, and response to cellular microenvironments of pancreatic carcinoma and ultimately may lead to improving early diagnosis and discovering innovative therapeutic approaches for cancer.
Tan
Zhi-Jun
ZJ
Department of General Surgery, Changhai Hospital, Second Military Medical University, Shanghai 200433, China.
Hu
Xian-Gui
XG
Cao
Gui-Song
GS
Tang
Yan
Y
D014408:Biomarkers, Tumor / Q000032:analysis; D004798:Enzymes / Q000235:genetics; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D005819:Genetic Markers; D006801:Humans; D009363:Neoplasm Proteins / Q000032:analysis / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D010190:Pancreatic Neoplasms / Q000235:genetics*; D012334:RNA, Neoplasm / Q000235:genetics / Q000302:isolation & purification
D014408:Biomarkers, Tumor; D004798:Enzymes; D005819:Genetic Markers; D009363:Neoplasm Proteins; D012334:RNA, Neoplasm