STAT3 silencing enhances the efficacy of the HSV.tk suicide gene in gastrointestinal cancer therapy

Ye Hyeon Ahn, Hwajung Yi, Ji Young Shin, Kang Duck Lee, Seung Pil Shin, Sang Jin Lee, Jaewhan Song, Kyung Hee Chun

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Aberrant activation of Signal Transducer and Activator of Transcription 3 (STAT3) signaling has been shown to be associated with uncontrolled cell proliferation and suppression of host-immune surveillance. Conversely, silencing STAT3 can have the dual effects of inhibiting cancer cell proliferation and inducing anti-tumor immune responses. Here, we report on the effects of STAT3 silencing on suicide gene therapy with thymidine kinase (tk). STAT3 silencing by siRNA inhibited the proliferation of AGS human gastric cancer cells through G1 cell cycle arrest, decreased levels of immune-suppressive cytokines, and increased levels of immune-activating cytokines. CT26 mouse colon adenocarcinoma cells, in which STAT3 expression was knocked-down by a STAT3 shRNA-containing lentivirus, grew more slowly in syngenic model Balb/c mice than control CT26 cells. Moreover, we found that STAT3 silencing augmented the efficacy of suicide gene therapy in CT26 cell xenografted mice. When we administrated adenoviruses harboring the herpes simplex virus thymidine kinase gene (Ad5.CMV.HSV.tk) into STAT3-silenced CT26 cell tumors, extensive apoptosis was observed and there was a significant reduction in the size of CT26 cell tumors. STAT3 silencing also enhanced the recruitment and cytotoxic activity of CD3 +CD8 + T-cells, and changed the cytokine expression pattern of CT26 cell tumors, reflecting augmentation of anti-cancer immune responses. We conclude that combining suicide gene therapy with STAT3 silencing can result in enhanced anti-cancer effects.

Original languageEnglish
Pages (from-to)359-369
Number of pages11
JournalClinical and Experimental Metastasis
Volume29
Issue number4
DOIs
Publication statusPublished - 2012 Apr 1

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STAT3 Transcription Factor
Gastrointestinal Neoplasms
Thymidine Kinase
Suicide
Genes
Neoplasms
Genetic Therapy
Therapeutics
Cytokines
Small Interfering RNA
Cell Proliferation
Personnel Selection
G1 Phase Cell Cycle Checkpoints
Lentivirus
Simplexvirus
Cell Size
Adenoviridae
Stomach Neoplasms
Colon
Adenocarcinoma

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

Cite this

Ahn, Ye Hyeon ; Yi, Hwajung ; Shin, Ji Young ; Lee, Kang Duck ; Shin, Seung Pil ; Lee, Sang Jin ; Song, Jaewhan ; Chun, Kyung Hee. / STAT3 silencing enhances the efficacy of the HSV.tk suicide gene in gastrointestinal cancer therapy. In: Clinical and Experimental Metastasis. 2012 ; Vol. 29, No. 4. pp. 359-369.
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STAT3 silencing enhances the efficacy of the HSV.tk suicide gene in gastrointestinal cancer therapy. / Ahn, Ye Hyeon; Yi, Hwajung; Shin, Ji Young; Lee, Kang Duck; Shin, Seung Pil; Lee, Sang Jin; Song, Jaewhan; Chun, Kyung Hee.

In: Clinical and Experimental Metastasis, Vol. 29, No. 4, 01.04.2012, p. 359-369.

Research output: Contribution to journalArticle

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