title: Differential gene expression by fiber-optic beadarray and pathway in adrenocorticotrophin-secreting pituitary adenomas.
abstract: BACKGROUND
  Adrenocorticotrophin (ACTH)-secreting pituitary adenomas account for approximately 7% - 14% of all pituitary adenomas, but its pathogenesis is still enigmatic. This study aimed to explore mechanisms underlying the pathogenesis of ACTH-secreting pituitary adenomas.
  
  
  METHODS
  We used fiber-optic beadarray to examine gene expression in three ACTH-secreting adenomas compared with three normal pituitaries. Four differentially expressed genes from the three ACTH-secreting adenomas and three normal pituitaries were chosen randomly for validation by reverse transcriptase-real time quantitative polymerase chain reaction (RT-qPCR). We then analyzed the differentially expressed gene profile with Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway.
  
  
  RESULTS
  Fiber-optic beadarray analysis showed that the expression of 28 genes and 8 expressed sequence tags (ESTs) were significantly increased and the expression of 412 genes and 31 ESTs were significantly decreased. Bioinformatic and pathway analysis showed that the genes HIGD1B, EPS8, HPGD, DAPK2, and IGFBP3 and the transforming growth factor (TGF)-β signaling pathway and extracellular matrix (ECM)-receptor interaction pathway may play important roles in tumorigenesis and progression of ACTH-secreting pituitary adenomas.
  
  
  CONCLUSIONS
  Our data suggest that numerous aberrantly expressed genes and several pathways are involved in the pathogenesis of ACTH-secreting pituitary adenomas. Fiber-optic beadarray combined with pathway analysis of differential gene expression appears to be a valid method of investigating tumour pathogenesis.
authors.affiliation: Capital Medical University, Beijing 100069, China.
authors.forename: Zhi-Quan
authors.initials: ZQ
authors.lastname: Jiang
authors.forename: Song-Bo
authors.initials: SB
authors.lastname: Gui
authors.forename: Ya-Zhuo
authors.initials: YZ
authors.lastname: Zhang
mesh_terms: D049913:ACTH-Secreting Pituitary Adenoma / Q000209:etiology* / Q000235:genetics; D000236:Adenoma / Q000209:etiology* / Q000235:genetics; D000328:Adult; D018450:Disease Progression; D020224:Expressed Sequence Tags; D016326:Extracellular Matrix Proteins / Q000502:physiology; D005260:Female; D005336:Fiber Optic Technology; D020869:Gene Expression Profiling; D006801:Humans; D008297:Male; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000502:physiology*; D016211:Transforming Growth Factor alpha / Q000502:physiology
chemical_list: D016326:Extracellular Matrix Proteins; D016211:Transforming Growth Factor alpha