A high expression level of insulin-like growth factor I receptor is associated with increased expression of transcription factor Sp1 and regional lymph node metastasis of human gastric cancer.

Published

Journal Article

Insulin-like growth factor I receptor (IGF-IR) is critical to cell survival and growth and altered IGF-IR expression is found in many human cancers. However, its expression and potential role in gastric cancer development and progression has not been explored. The IGF-IR expression level was determined via immunohistochemistry in primary tumor and lymph node metastasis of 86 cases of resected gastric cancer. Relationships of IGF-IR expression with transcription factor Spl expression and clinicopathological features were analyzed. The impact of altered Sp1 expression on IGF-IR expression and gastric cancer biology was further determined using small inhibitory RNA for Sp1 mRNA. We found that IGF-IR was overexpressed in 62% of the tumor samples when compared with adjacent tumor-free gastric mucosa. Patients with lymph node metastases had strong expression of IGF-IR in both primary and metastatic tumor cells. IGF-IR overexpression in the primary tumor correlated with increased lymph node metastasis. Furthermore, the level of IGF-IR expression directly correlated with that of Spl, an important transcription factor for IGF-IR regulation. Knocking-down of Spl expression by small inhibitory RNA led to decreased IGF-IR expression and attenuated growth and metastasis of gastric cancer cells. Therefore, dysregulated expression of IGF-IR and/or Sp1 may contribute to the growth and metastasis of gastric cancer and potentially can be a target of therapeutic intervention.

Full Text

Duke Authors

Cited Authors

  • Jiang, Y; Wang, L; Gong, W; Wei, D; Le, X; Yao, J; Ajani, J; Abbruzzese, JL; Huang, S; Xie, K

Published Date

  • 2004

Published In

Volume / Issue

  • 21 / 8

Start / End Page

  • 755 - 764

PubMed ID

  • 16035620

Pubmed Central ID

  • 16035620

International Standard Serial Number (ISSN)

  • 0262-0898

Language

  • eng

Conference Location

  • Netherlands