KGF induces lipogenic genes through a PI3K and JNK/SREBP-1 pathway in H292 cells
Lipid synthesis is required for cell growth and is subject to pharmacologic regulation. Keratinocyte growth factor (KGF) stimulates proliferation and lipogenesis in H292 cells, a pulmonary epithelial cancer cell line, but the signaling pathways are not known. KGF stimulated the expression of the tra...
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doaj-081f7b8d805c4f2daf1fa925ea1cbaa72021-04-27T04:43:21ZengElsevierJournal of Lipid Research0022-22752005-12-01461226242635KGF induces lipogenic genes through a PI3K and JNK/SREBP-1 pathway in H292 cellsYongsheng Chang0Jieru Wang1Xiaojun Lu2Douglas P. Thewke3Robert J. Mason4Department of Medicine, National Jewish Medical and Research Center, Denver, CO 80206Department of Medicine, National Jewish Medical and Research Center, Denver, CO 80206Department of Medicine, National Jewish Medical and Research Center, Denver, CO 80206Department of Biochemistry and Molecular Biology, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614To whom correspondence should be addressed.; Department of Medicine, National Jewish Medical and Research Center, Denver, CO 80206Lipid synthesis is required for cell growth and is subject to pharmacologic regulation. Keratinocyte growth factor (KGF) stimulates proliferation and lipogenesis in H292 cells, a pulmonary epithelial cancer cell line, but the signaling pathways are not known. KGF stimulated the expression of the transcription factors sterol-regulatory element binding protein-1 (SREBP-1), CCAAT/enhancer binding protein α (C/EBPα), and C/EBPδ and two key enzymes involved in lipogenesis, FAS and stearoyl coenzyme A desaturase-1 (SCD-1). We found that KGF induced rapid activation of Akt, p70 S6K, JNK, and extracellular signal-regulated (ERK). Induction of SREBP-1, SCD-1, and FAS by KGF was inhibited by the JNK inhibitor SP600125 and the phosphatidylinositol 3-kinase (PI3K) inhibitor LY294002 but not by the ERK inhibitor PD98059. Using FAS and SCD-1-luciferase promoter constructs, we observed that KGF stimulated the transcription of these promoters and that exogenous cholesterol inhibited the induction. Mutation of the SREBP-1 binding site in the SCD-1 promoter abolished the effect of KGF on SCD-1 transcription. In addition, overexpression of active SREBP-1 directly stimulated SCD-1 and FAS. Conversely, adenovirus-mediated overexpression of a dominant negative form of SREBP-1 inhibited the KGF effect on FAS and SCD-1 expression.In summary, we conclude that KGF requires both PI3K and JNK signaling pathways to induce SREBP-1, which in turn induces SCD-1 and FAS expression in H292 cells.http://www.sciencedirect.com/science/article/pii/S0022227520328509H292 cellslipogenesislung cancerkeratinocyte growth factorphosphatidylinositol 3-kinasesterol-regulatory element binding protein-1 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yongsheng Chang Jieru Wang Xiaojun Lu Douglas P. Thewke Robert J. Mason |
spellingShingle |
Yongsheng Chang Jieru Wang Xiaojun Lu Douglas P. Thewke Robert J. Mason KGF induces lipogenic genes through a PI3K and JNK/SREBP-1 pathway in H292 cells Journal of Lipid Research H292 cells lipogenesis lung cancer keratinocyte growth factor phosphatidylinositol 3-kinase sterol-regulatory element binding protein-1 |
author_facet |
Yongsheng Chang Jieru Wang Xiaojun Lu Douglas P. Thewke Robert J. Mason |
author_sort |
Yongsheng Chang |
title |
KGF induces lipogenic genes through a PI3K and JNK/SREBP-1 pathway in H292 cells |
title_short |
KGF induces lipogenic genes through a PI3K and JNK/SREBP-1 pathway in H292 cells |
title_full |
KGF induces lipogenic genes through a PI3K and JNK/SREBP-1 pathway in H292 cells |
title_fullStr |
KGF induces lipogenic genes through a PI3K and JNK/SREBP-1 pathway in H292 cells |
title_full_unstemmed |
KGF induces lipogenic genes through a PI3K and JNK/SREBP-1 pathway in H292 cells |
title_sort |
kgf induces lipogenic genes through a pi3k and jnk/srebp-1 pathway in h292 cells |
publisher |
Elsevier |
series |
Journal of Lipid Research |
issn |
0022-2275 |
publishDate |
2005-12-01 |
description |
Lipid synthesis is required for cell growth and is subject to pharmacologic regulation. Keratinocyte growth factor (KGF) stimulates proliferation and lipogenesis in H292 cells, a pulmonary epithelial cancer cell line, but the signaling pathways are not known. KGF stimulated the expression of the transcription factors sterol-regulatory element binding protein-1 (SREBP-1), CCAAT/enhancer binding protein α (C/EBPα), and C/EBPδ and two key enzymes involved in lipogenesis, FAS and stearoyl coenzyme A desaturase-1 (SCD-1). We found that KGF induced rapid activation of Akt, p70 S6K, JNK, and extracellular signal-regulated (ERK). Induction of SREBP-1, SCD-1, and FAS by KGF was inhibited by the JNK inhibitor SP600125 and the phosphatidylinositol 3-kinase (PI3K) inhibitor LY294002 but not by the ERK inhibitor PD98059. Using FAS and SCD-1-luciferase promoter constructs, we observed that KGF stimulated the transcription of these promoters and that exogenous cholesterol inhibited the induction. Mutation of the SREBP-1 binding site in the SCD-1 promoter abolished the effect of KGF on SCD-1 transcription. In addition, overexpression of active SREBP-1 directly stimulated SCD-1 and FAS. Conversely, adenovirus-mediated overexpression of a dominant negative form of SREBP-1 inhibited the KGF effect on FAS and SCD-1 expression.In summary, we conclude that KGF requires both PI3K and JNK signaling pathways to induce SREBP-1, which in turn induces SCD-1 and FAS expression in H292 cells. |
topic |
H292 cells lipogenesis lung cancer keratinocyte growth factor phosphatidylinositol 3-kinase sterol-regulatory element binding protein-1 |
url |
http://www.sciencedirect.com/science/article/pii/S0022227520328509 |
work_keys_str_mv |
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