Volume 105, Issue 2 pp. 470-477

Possible involvement of bcl-2 in regulation of cell-cycle progression of haemopoietic cells by transforming growth factor-β1

Nadim Mahmud

Nadim Mahmud

The Second Department of Internal Medicine,

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Naoyuki Katayama

Naoyuki Katayama

The Second Department of Internal Medicine,

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Kazuhiro Nishii

Kazuhiro Nishii

The Second Department of Internal Medicine,

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Takayuki Sugawara

Takayuki Sugawara

The Second Department of Internal Medicine,

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Yoshihiro Komada

Yoshihiro Komada

Department of Paediatrics, Mie University School of Medicine,

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Hidetsugu Mitani

Hidetsugu Mitani

The Second Department of Internal Medicine,

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Hiroto Araki

Hiroto Araki

The Second Department of Internal Medicine,

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Koshi Ohishi

Koshi Ohishi

The Second Department of Internal Medicine,

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Masato Watanabe

Masato Watanabe

The Second Department of Internal Medicine,

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Masahiro Masuya

Masahiro Masuya

The Second Department of Internal Medicine,

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Masakatsu Nishikawa

Masakatsu Nishikawa

The Second Department of Internal Medicine,

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Nobuyuki Minami

Nobuyuki Minami

Blood Transfusion Service, Mie University Hospital, Tsu, Mie,

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Hideya Ohashi

Hideya Ohashi

Pharmaceutical Laboratories, Kirin Brewery Co., Maebashi, Gunma, Japan

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Hiroshi Shiku

Hiroshi Shiku

The Second Department of Internal Medicine,

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First published: 17 February 2005
Citations: 19
Dr Naoyuki Katayama The Second Department of Internal Medicine, Mie University School of Medicine. 2-174 Edobashi, Tsu, Mie 514-8507, Japan.

Abstract

Transforming growth factor-β1 (TGF-β1) acts directly on haemopoietic progenitor cells to regulate their growth. To investigate a possible link between the action of TGF-β1 and cell death regulators such as bcl-2, we utilized Ba/F3 cells, the interleukin-3 (IL-3)-dependent growth of which could be modulated by TGF-β1, as well as haemopoietic progenitor cells. We demonstrate here that up-regulation of bcl-2 protein (Bcl-2) as well as that of an inhibitor of cyclin/cyclin-dependent kinase complex, p27, was associated with TGF-β1-induced deceleration of the cell-cycling of haemopoietic progenitor cells and Ba/F3 cells. The data from cell-cycle analysis of Ba/F3 cells showed that TGF-β1 retarded the G1 to S phase transition. Analysis of cells with the potential to express Bcl-2 in an inducible manner indicated that up-regulation of Bcl-2 was sufficient for not only an increase in the level of p27 but also to inhibit the cell growth. Using c-kit-overexpressing cells, we observed that the potential of TGF-β1 to up-regulate the expression of Bcl-2 and p27 could be counteracted by the c-kit ligand, stem cell factor. These results demonstrate that Bcl-2 exerts an essential function in the regulation of G1 to S phase transition of haemopoietic cells by TGF-β1.

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