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MTA2 promotes gastric cancer cells invasion and is transcriptionally regulated by Sp1.

AbstractBACKGROUND:
MTA2 gene belongs to metastasis associated family, and is highly expressed in some solid tumors, including gastric cancer. Its biological function in gastric cancer is currently undefined.
METHODS:
Metastasis-associated tumor gene family 2 (MTA2) and transcription factor specificity protein 1 (Sp1) expression were detected in 127 gastric cancer samples by immunohistochemistry staining. SGC-7901 and AGS gastric cancer cell lines transfected by MTA2 shRNA was used for biological function investigation. Binding and regulation activities of Sp1 on MTA2 promoter were investigated by chromatin immunoprecipitation and luciferase reporter gene.
RESULTS:
The expression rate of MTA2 in gastric cancer tissues was 55.9% (71/127), and its expression was closely related to the depth of tumor invasion, lymph nodes metastasis, and TNM staging. MTA2 knockdown in human SGC-7901 and AGS gastric cancer cells significantly inhibited migration and invasion in vitro, and disrupted structure of cytoskeleton. MTA2 knockdown also attenuated xenografts growth and lung metastasis in nude mice model. MTA2 expression was positively correlated with transcription factor Sp1 in gastric cancer tissues (r = 0.326, P < 0.001). Sp1 bound to human MTA2 gene promoter at region from -1043 bp to -843 bp. Transcriptional activity of MTA2 promoter could be enhanced by Sp1 overexpression.
CONCLUSIONS:
MTA2 knockdown impairs invasion and metastasis of gastric cancer cells, and attenuates xenografts growth in vivo. Sp1 regulates MTA2 expression at transcriptional level.
AuthorsChenfei Zhou, Jun Ji, Qu Cai, Min Shi, Xuehua Chen, Yingyan Yu, Bingya Liu, Zhenggang Zhu, Jun Zhang
JournalMolecular cancer (Mol Cancer) Vol. 12 Issue 1 Pg. 102 (Sep 08 2013) ISSN: 1476-4598 [Electronic] England
PMID24010737 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Repressor Proteins
  • Sp1 Transcription Factor
  • MTA2 protein, human
  • Histone Deacetylases
Topics
  • Actin Cytoskeleton (metabolism)
  • Adenocarcinoma (metabolism, mortality, secondary)
  • Animals
  • Binding Sites
  • Cell Line, Tumor
  • Cell Movement
  • Gene Expression Regulation, Neoplastic
  • Histone Deacetylases (genetics, metabolism)
  • Humans
  • Lung Neoplasms (genetics, metabolism, secondary)
  • Male
  • Mice
  • Mice, Inbred BALB C
  • Mice, Nude
  • Neoplasm Invasiveness
  • Neoplasm Transplantation
  • Promoter Regions, Genetic
  • Repressor Proteins (genetics, metabolism)
  • Sp1 Transcription Factor (physiology)
  • Stomach Neoplasms (genetics, metabolism, mortality, pathology)
  • Transcription, Genetic

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