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Wang Y, Arribas-Layton M, Chen Y, Lykke-Andersen J, Sen GL. DDX6 Orchestrates Mammalian Progenitor Function through the mRNA Degradation and Translation Pathways. Mol Cell 2015; 60:118-30. [PMID: 26412305 DOI: 10.1016/j.molcel.2015.08.014] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 06/11/2015] [Accepted: 08/18/2015] [Indexed: 12/26/2022]
Abstract
In adult tissues, stem and progenitor cells must balance proliferation and differentiation to maintain homeostasis. How this is done is unclear. Here, we show that the DEAD box RNA helicase, DDX6 is necessary for maintaining adult progenitor cell function. DDX6 loss results in premature differentiation and decreased proliferation of epidermal progenitor cells. To maintain self-renewal, DDX6 associates with YBX1 to bind the stem loops found in the 3' UTRs of regulators of proliferation/self-renewal (CDK1, EZH2) and recruit them to EIF4E to facilitate their translation. To prevent premature differentiation of progenitor cells, DDX6 regulates the 5' UTR of differentiation inducing transcription factor, KLF4 and degrades its transcripts through association with mRNA degradation proteins. Our results demonstrate that progenitor function is maintained by DDX6 complexes through two distinct pathways that include the degradation of differentiation-inducing transcripts and by promoting the translation of self-renewal and proliferation mRNAs.
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Affiliation(s)
- Ying Wang
- Department of Dermatology, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093-0869, USA; UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Marc Arribas-Layton
- Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Yifang Chen
- Department of Dermatology, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093-0869, USA; UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Jens Lykke-Andersen
- Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - George L Sen
- Department of Dermatology, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093-0869, USA; UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA.
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Yoda T, Kikuchi K, Miki Y, Onodera Y, Hata S, Takagi K, Nakamura Y, Hirakawa H, Ishida T, Suzuki T, Ohuchi N, Sasano H, McNamara KM. 11β-Prostaglandin F2α, a bioactive metabolite catalyzed by AKR1C3, stimulates prostaglandin F receptor and induces slug expression in breast cancer. Mol Cell Endocrinol 2015; 413:236-47. [PMID: 26170067 DOI: 10.1016/j.mce.2015.07.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 06/30/2015] [Accepted: 07/07/2015] [Indexed: 01/24/2023]
Abstract
Prostaglandins are a group of lipid compounds involved in inflammation and cancer. We focused on PGF2α and its stereoisomer 11β-PGF2α and examined the expression and functions of their cognate receptor (FP receptor) and metabolizing enzymes (AKR1B1 and AKR1C3 respectively) in breast cancer. In immunohistochemical analysis FP receptor status associated with adverse clinical outcome only in the AKR1C3 positive cases. Therefore, we studied FP receptor-mediated functions of 11β-PGF2α using FP receptor expressed MCF-7 cell line (MCF-FP). 11β-PGF2α treatment phosphorylated ERK and CREB and induced Slug expression through FP receptor in MCF-FP, and MCF-FP cells demonstrated decreased chemosensitivity compared to parental controls. Finally, the correlation between FP receptor and Slug was also confirmed immunohistochemically in breast cancer cases. Overall these results indicated that the actions of AKR1C3 can produce FP receptor ligands whose activation results in carcinoma cell survival in breast cancer.
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Affiliation(s)
- Tomomi Yoda
- Department of Pathology, Tohoku University School of Medicine, Sendai, Japan
| | - Kyoko Kikuchi
- Department of Pathology, Tohoku University School of Medicine, Sendai, Japan
| | - Yasuhiro Miki
- Department of Pathology, Tohoku University School of Medicine, Sendai, Japan
| | - Yoshiaki Onodera
- Department of Pathology, Tohoku University School of Medicine, Sendai, Japan
| | - Shuko Hata
- Department of Pathology, Tohoku University School of Medicine, Sendai, Japan
| | - Kiyoshi Takagi
- Department of Pathology and Histotechnology, Tohoku University School of Medicine, Sendai, Japan
| | - Yasuhiro Nakamura
- Department of Pathology, Tohoku University School of Medicine, Sendai, Japan
| | | | - Takanori Ishida
- Department of Surgery, Tohoku University School of Medicine, Sendai, Japan
| | - Takashi Suzuki
- Department of Pathology and Histotechnology, Tohoku University School of Medicine, Sendai, Japan
| | - Noriaki Ohuchi
- Department of Surgery, Tohoku University School of Medicine, Sendai, Japan
| | - Hironobu Sasano
- Department of Pathology, Tohoku University School of Medicine, Sendai, Japan
| | - Keely May McNamara
- Department of Pathology, Tohoku University School of Medicine, Sendai, Japan.
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Abstract
Epithelial to mesenchymal transition transcription factors (EMT-TFs) such as SNAI2 have been found to be expressed endogenously in epidermal stem and progenitor cells and downregulated upon differentiation. The presence of SNAI2 in progenitor cells is necessary to repress the expression of differentiation genes by binding directly to their promoters. SNAI2 is downregulated upon differentiation which allows expression of differentiation genes. Furthermore overexpression of SNAI2 can block the differentiation process suggesting that the levels of SNAI2 are crucial to epidermal cell fate decisions. To address on a genome wide level the genes that are impacted by changing the levels of SNAI2, we performed microarray analysis on SNAI2 knockdown and overexpressing epidermal progenitor cells. Here we provide detailed methods and analysis on these microarray data which has been deposited in Gene Expression Omnibus (GEO): GSE55269.
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