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Erschienen in: Annals of Surgical Oncology 4/2007

01.04.2007

STAT1 Activation-Induced Apoptosis of Esophageal Squamous Cell Carcinoma Cells In Vivo

verfasst von: Junichi Kaganoi, MD, PhD, Go Watanabe, MD, PhD, Michio Okabe, MD, Shiro Nagatani, MD, Atsushi Kawabe, MD, PhD, Yutaka Shimada, MD, PhD, Masayuki Imamura, MD, PhD, Yoshiharu Sakai, MD, PhD

Erschienen in: Annals of Surgical Oncology | Ausgabe 4/2007

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ABSTRACT

Background

The induction of apoptosis might be a promising treatment for cancers refractory to conventional therapies, such as esophageal cancer. In this study, we examined whether epidermal growth factor–induced growth inhibition results from apoptosis of esophageal squamous cell carcinoma (SCC) cells as a result of STAT1 activation and evaluated whether interferon gamma (IFN-γ) can induce apoptosis of cancer cells in vivo.

Methods

To assess the function of STAT1, we established stable transfectants expressing dominant-negative STAT1. Apoptosis was assessed by several experimental techniques, including flow cytometry. Differentiation was evaluated by Western blot test with involucrin used as a marker. In vivo, cancer cells were injected into male BALB/c nu/nu mice. Two weeks later, the mice started to receive injections of IFN-γ or saline into a tail vein four times per week. Concentrations of IFN-γ in the tumors were analyzed by enzyme-linked immunosorbent assay. Apoptosis was evaluated by TUNEL (terminal deoxynucleotidyl transferase dUTP nick-end labeling) staining.

Results

Epidermal growth factor inhibited the growth of esophageal SCC cells by causing apoptosis through several pathways involving STAT1 activation. IFN-γ induced the apoptosis of cancer cells, but it also promoted the differentiation (not apoptosis) of primary cultured cells derived from normal esophageal epithelium. IFN-γ also inhibited the growth of xenograft tumors of esophageal SCC cells in vivo.

Conclusions

Our results suggest that IFN-γ is one candidate for cytokine-based therapy of cancer. IFN-γ–induced STAT1 activation might be involved in the apoptosis of esophageal SCC cells and in the terminal differentiation of normal squamous cells. Further studies of STAT1 signaling pathways may provide the basis for new targeted therapeutic strategies for esophageal SCC.
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Metadaten
Titel
STAT1 Activation-Induced Apoptosis of Esophageal Squamous Cell Carcinoma Cells In Vivo
verfasst von
Junichi Kaganoi, MD, PhD
Go Watanabe, MD, PhD
Michio Okabe, MD
Shiro Nagatani, MD
Atsushi Kawabe, MD, PhD
Yutaka Shimada, MD, PhD
Masayuki Imamura, MD, PhD
Yoshiharu Sakai, MD, PhD
Publikationsdatum
01.04.2007
Verlag
Springer-Verlag
Erschienen in
Annals of Surgical Oncology / Ausgabe 4/2007
Print ISSN: 1068-9265
Elektronische ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-006-9274-7

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