Cyclin A1, the alternative A-type cyclin, contributes to G1 S cell cycle progression in somatic cells

Cyclin A1 is an alternative A-type cyclin that is essential for spermatogenesis, but it is also expressed in hematopoietic progenitor cells and in acute myeloid leukemia. Its functions during cell cycle progression of somatic cells are incompletely understood. Here, we have analysed the cell cycle f...

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Veröffentlicht in:Oncogene 2005-04, Vol.24 (16), p.2739-2744
Hauptverfasser: PING JI, AGRAWAL, Shuchi, SERVE, Hubert, MÜLLER-TIDOW, Carsten, DIEDERICHS, Sven, BÄUMER, Nicole, BECKER, Annette, CAUVET, Thomas, KOWSKI, Sascha, BEGER, Carmela, WELTE, Karl, BERDEL, Wolfgang E
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container_end_page 2744
container_issue 16
container_start_page 2739
container_title Oncogene
container_volume 24
creator PING JI
AGRAWAL, Shuchi
SERVE, Hubert
MÜLLER-TIDOW, Carsten
DIEDERICHS, Sven
BÄUMER, Nicole
BECKER, Annette
CAUVET, Thomas
KOWSKI, Sascha
BEGER, Carmela
WELTE, Karl
BERDEL, Wolfgang E
description Cyclin A1 is an alternative A-type cyclin that is essential for spermatogenesis, but it is also expressed in hematopoietic progenitor cells and in acute myeloid leukemia. Its functions during cell cycle progression of somatic cells are incompletely understood. Here, we have analysed the cell cycle functions of cyclin A1 in transformed and nontransformed cells. Murine embryonic fibroblasts derived from cyclin A1-deficient mice were significantly impaired in their proliferative capacity. In accordance, cyclin A1-/- cells accumulated in G1 and G2/M phase while the percentage of S phase cells decreased. Also, lectin stimulated splenic lymphocytes from cyclin A1-/- mice proliferated slower than their wild-type counterparts. Forced cyclin A1 overexpression in NIH3T3 cells and in U937 leukemic cells either by transient transfection or by retroviral infection enhanced S phase entry. Consequently, siRNA mediated silencing of cyclin A1 in highly cyclin A1 expressing ML1 leukemic cells significantly slowed S phase entry, decreased proliferation and inhibited colony formation. Taken together, these analyses demonstrate that cyclin A1 contributes to G1 to S cell cycle progression in somatic cells. Cyclin A1 overexpression enhances S phase entry consistent with an oncogenic function. Finally, cyclin A1 might be a therapeutic target since its silencing inhibited leukemia cell growth.
doi_str_mv 10.1038/sj.onc.1208356
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Its functions during cell cycle progression of somatic cells are incompletely understood. Here, we have analysed the cell cycle functions of cyclin A1 in transformed and nontransformed cells. Murine embryonic fibroblasts derived from cyclin A1-deficient mice were significantly impaired in their proliferative capacity. In accordance, cyclin A1-/- cells accumulated in G1 and G2/M phase while the percentage of S phase cells decreased. Also, lectin stimulated splenic lymphocytes from cyclin A1-/- mice proliferated slower than their wild-type counterparts. Forced cyclin A1 overexpression in NIH3T3 cells and in U937 leukemic cells either by transient transfection or by retroviral infection enhanced S phase entry. Consequently, siRNA mediated silencing of cyclin A1 in highly cyclin A1 expressing ML1 leukemic cells significantly slowed S phase entry, decreased proliferation and inhibited colony formation. 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Psychology ; G1 Phase ; Gene Expression ; Hematologic and hematopoietic diseases ; Hematology ; Hematopoietic stem cells ; Humans ; Incorporation ; Kinetics ; Leukemia ; Leukemia - genetics ; Leukemia - metabolism ; Leukemias. Malignant lymphomas. Malignant reticulosis. 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subjects Acute myeloid leukemia
Animals
Biological and medical sciences
Cell cycle
Cell physiology
Cell Proliferation
Cell transformation and carcinogenesis. Action of oncogenes and antioncogenes
Cell Transformation, Neoplastic
Cyclin A - genetics
Cyclin A - metabolism
Cyclin A1
Embryo fibroblasts
Female
Fundamental and applied biological sciences. Psychology
G1 Phase
Gene Expression
Hematologic and hematopoietic diseases
Hematology
Hematopoietic stem cells
Humans
Incorporation
Kinetics
Leukemia
Leukemia - genetics
Leukemia - metabolism
Leukemias. Malignant lymphomas. Malignant reticulosis. Myelofibrosis
Lymphocytes
Male
Medical sciences
Mice
Mice, Knockout
Molecular and cellular biology
NIH 3T3 Cells
Oligoribonucleotides
Oncology
Progenitor cells
S Phase
siRNA
Somatic cells
Spermatogenesis
Spleen
Therapeutic targets
Transfection
U937 Cells
title Cyclin A1, the alternative A-type cyclin, contributes to G1 S cell cycle progression in somatic cells
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