Volume 44, Issue 4 pp. 701-706
Human Cancer
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Suppression of c-myc mRNA expression by steroid hormones in HTLV-I-infected T-cell line, KH-2

Tamio Koizumi

Tamio Koizumi

The Third Division, Department of Medicine, Kobe University School of Medicine, Kobe 650

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Yoshinobu Nakao

Corresponding Author

Yoshinobu Nakao

The Third Division, Department of Medicine, Kobe University School of Medicine, Kobe 650

The Third Division, Department of Medicine, Kobe University School of Medicine, Kobe 650Search for more papers by this author
Michiko Kawanishi

Michiko Kawanishi

Department of Medical Microbiology, Faculty of Medicine, Kyoto University, Kyoto

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Sakan Maeda

Sakan Maeda

The Second Department of Pathology, Kobe University School of Medicine, Kobe 650, Japan

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Taketoshi Sugiyama

Taketoshi Sugiyama

The Second Department of Pathology, Kobe University School of Medicine, Kobe 650, Japan

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Takuo Fujita

Takuo Fujita

The Third Division, Department of Medicine, Kobe University School of Medicine, Kobe 650

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First published: 15 October 1989
Citations: 12

Abstract

The effects of l,25(OH)2D3 and dexamethasone on cellular proliferation and gene expression of the HTLV-l-infected T-cell line, KH-2, established from a patient with adult T-cell leukemia, endemic in the south-west Japanese islands and the Caribbean, were examined. KH-2 cells are integrated by HTLV-I proviral DNA and expressed mRNA for c-myc, IL-2 receptor a-chain (IL-2Rα), and T-cell receptor β-chain (TCRβ) while it did not express IL-2 mRNA. l,25(OH)2D3 and dexamethasone did not suppress the mRNA levels of HTLV-I, IL-2Rα or TCRβ but reduced the c-myc mRNA level. The reduction of c-myc mRNA level was marked in l,25(OH)2D3-treated cells but relatively weak in dexamethasone-treated cells. This inhibitory effect of the steroid hormones correlated with the inhibition of KH-2 cell proliferation.

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