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Chang JX, Zhang M, Lou LL, Chu HY, Wang HQ. KIS, a target of SOX4, regulates the ID1-mediated enhancement of β-catenin to facilitate lung adenocarcinoma cell proliferation and metastasis. J Cancer Res Clin Oncol 2024; 150:366. [PMID: 39052126 PMCID: PMC11272720 DOI: 10.1007/s00432-024-05853-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Accepted: 06/17/2024] [Indexed: 07/27/2024]
Abstract
PURPOSE Kinase interacting with stathmin (KIS) is a serine/threonine kinase involved in RNA processing and protein phosphorylation. Increasing evidence has suggested its involvement in cancer progression. The aim of this study was to investigate the role of KIS in the development of lung adenocarcinoma (LUAD). Dual luciferase assay was used to explore the relationship between KIS and SOX4, and its effect on ID1/β-catenin pathway. METHODS Real-time qPCR and western blot were used to assess the levels of KIS and other factors. Cell proliferation, migration, and invasion were monitored, and xenograft animal model were established to investigate the biological functions of KIS in vitro and in vivo. RESULTS In the present study, KIS was found to be highly expressed in LUAD tissues and cell lines. KIS accelerated the proliferative, migratory and invasive abilities of LUAD cells in vitro, and promoted the growth of LUAD in a mouse tumor xenograft model in vivo. Mechanistically, KIS activated the β-catenin signaling pathway by modulating the inhibitor of DNA binding 1 (ID1) and was transcriptionally regulated by SOX4 in LUAD cells. CONCLUSION KIS, a target of SOX4, regulates the ID1-mediated enhancement of β-catenin to facilitate LUAD cell invasion and metastasis.
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Affiliation(s)
- Jing-Xia Chang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Zhengzhou University, No. 1, Jianshe East Road, Zhengzhou, Henan Province, 450000, P.R. China.
| | - Meng Zhang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Zhengzhou University, No. 1, Jianshe East Road, Zhengzhou, Henan Province, 450000, P.R. China
| | - Li-Li Lou
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Zhengzhou University, No. 1, Jianshe East Road, Zhengzhou, Henan Province, 450000, P.R. China
| | - He-Ying Chu
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Zhengzhou University, No. 1, Jianshe East Road, Zhengzhou, Henan Province, 450000, P.R. China
| | - Hua-Qi Wang
- Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Zhengzhou University, No. 1, Jianshe East Road, Zhengzhou, Henan Province, 450000, P.R. China
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2
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Githaka JM, Pirayeshfard L, Goping IS. Cancer invasion and metastasis: Insights from murine pubertal mammary gland morphogenesis. Biochim Biophys Acta Gen Subj 2023; 1867:130375. [PMID: 37150225 DOI: 10.1016/j.bbagen.2023.130375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 04/20/2023] [Accepted: 05/02/2023] [Indexed: 05/09/2023]
Abstract
Cancer invasion and metastasis accounts for the majority of cancer related mortality. A better understanding of the players that drive the aberrant invasion and migration of tumors cells will provide critical targets to inhibit metastasis. Postnatal pubertal mammary gland morphogenesis is characterized by highly proliferative, invasive, and migratory normal epithelial cells. Identifying the molecular regulators of pubertal gland development is a promising strategy since tumorigenesis and metastasis is postulated to be a consequence of aberrant reactivation of developmental stages. In this review, we summarize the pubertal morphogenesis regulators that are involved in cancer metastasis and revisit pubertal mammary gland transcriptome profiling to uncover both known and unknown metastasis genes. Our updated list of pubertal morphogenesis regulators shows that most are implicated in invasion and metastasis. This review highlights molecular linkages between development and metastasis and provides a guide for exploring novel metastatic drivers.
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Affiliation(s)
- John Maringa Githaka
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada.
| | - Leila Pirayeshfard
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Ing Swie Goping
- Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada; Department of Oncology, University of Alberta, Edmonton, AB T6G 2H7, Canada.
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3
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The Mammary Gland: Basic Structure and Molecular Signaling during Development. Int J Mol Sci 2022; 23:ijms23073883. [PMID: 35409243 PMCID: PMC8998991 DOI: 10.3390/ijms23073883] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 03/22/2022] [Accepted: 03/30/2022] [Indexed: 01/27/2023] Open
Abstract
The mammary gland is a compound, branched tubuloalveolar structure and a major characteristic of mammals. The mammary gland has evolved from epidermal apocrine glands, the skin glands as an accessory reproductive organ to support postnatal survival of offspring by producing milk as a source of nutrition. The mammary gland development begins during embryogenesis as a rudimentary structure that grows into an elementary branched ductal tree and is embedded in one end of a larger mammary fat pad at birth. At the onset of ovarian function at puberty, the rudimentary ductal system undergoes dramatic morphogenetic change with ductal elongation and branching. During pregnancy, the alveolar differentiation and tertiary branching are completed, and during lactation, the mature milk-producing glands eventually develop. The early stages of mammary development are hormonal independent, whereas during puberty and pregnancy, mammary gland development is hormonal dependent. We highlight the current understanding of molecular regulators involved during different stages of mammary gland development.
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Shin DH, Park JH, Lee JY, Won HY, Jang KS, Min KW, Jang SH, Woo JK, Oh SH, Kong G. Overexpression of Id1 in transgenic mice promotes mammary basal stem cell activity and breast tumorigenesis. Oncotarget 2016; 6:17276-90. [PMID: 25938540 PMCID: PMC4627307 DOI: 10.18632/oncotarget.3640] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Accepted: 04/06/2015] [Indexed: 11/25/2022] Open
Abstract
Inhibitor of differentiation/DNA binding (Id)1 is a crucial regulator of mammary development and breast cancer progression. However, its effect on stemness and tumorigenesis in mammary epithelial cells remains undefined. Herein, we demonstrate that Id1 induces mammary tumorigenesis by increasing normal and malignant mammary stem cell (MaSC) activities in transgenic mice. MaSC-enriched basal cell expansion and increased self-renewal and in vivo regenerative capacity of MaSCs are observed in the mammary glands of MMTV-Id1 transgenic mice. Furthermore, MMTV-Id1 mice develop ductal hyperplasia and mammary tumors with highly expressed basal markers. Id1 also increases breast cancer stem cell (CSC) population and activity in human breast cancer lines. Moreover, the effects of Id1 on normal and malignant stem cell activities are mediated by the Wnt/c-Myc pathway. Collectively, these findings provide in vivo genetic evidence of Id1 functions as an oncogene in breast cancer and indicate that Id1 regulates mammary basal stem cells by activating the Wnt/c-Myc pathway, thereby contributing to breast tumor development.
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Affiliation(s)
- Dong-Hui Shin
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Ji-Hye Park
- Institute for Bioengineering and Biopharmaceutical Research (IBBR), Hanyang University, Seoul, Republic of Korea
| | - Jeong-Yeon Lee
- Institute for Bioengineering and Biopharmaceutical Research (IBBR), Hanyang University, Seoul, Republic of Korea
| | - Hee-Young Won
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Ki-Seok Jang
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Kyueng-Whan Min
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Si-Hyong Jang
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Jong-Kyu Woo
- College of Pharmacy, Gachon University, Incheon, Republic of Korea
| | - Seung Hyun Oh
- College of Pharmacy, Gachon University, Incheon, Republic of Korea
| | - Gu Kong
- Department of Pathology, College of Medicine, Hanyang University, Seoul, Republic of Korea.,Institute for Bioengineering and Biopharmaceutical Research (IBBR), Hanyang University, Seoul, Republic of Korea
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5
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Lee JY, Won HY, Park JH, Kim HY, Choi HJ, Shin DH, Kang JH, Woo JK, Oh SH, Son T, Choi JW, Kim S, Kim HY, Yi K, Jang KS, Oh YH, Kong G. MEL-18 loss mediates estrogen receptor-α downregulation and hormone independence. J Clin Invest 2015; 125:1801-14. [PMID: 25822021 PMCID: PMC4463188 DOI: 10.1172/jci73743] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 02/12/2015] [Indexed: 12/26/2022] Open
Abstract
The polycomb protein MEL-18 has been proposed as a tumor suppressor in breast cancer; however, its functional relevance to the hormonal regulation of breast cancer remains unknown. Here, we demonstrated that MEL-18 loss contributes to the hormone-independent phenotype of breast cancer by modulating hormone receptor expression. In multiple breast cancer cohorts, MEL-18 was markedly downregulated in triple-negative breast cancer (TNBC). MEL-18 expression positively correlated with the expression of luminal markers, including estrogen receptor-α (ER-α, encoded by ESR1). MEL-18 loss was also associated with poor response to antihormonal therapy in ER-α-positive breast cancer. Furthermore, whereas MEL-18 loss in luminal breast cancer cells resulted in the downregulation of expression and activity of ER-α and the progesterone receptor (PR), MEL-18 overexpression restored ER-α expression in TNBC. Consistently, in vivo xenograft experiments demonstrated that MEL-18 loss induces estrogen-independent growth and tamoxifen resistance in luminal breast cancer, and that MEL-18 overexpression confers tamoxifen sensitivity in TNBC. MEL-18 suppressed SUMOylation of the ESR1 transactivators p53 and SP1, thereby driving ESR1 transcription. MEL-18 facilitated the deSUMOylation process by inhibiting BMI-1/RING1B-mediated ubiquitin-proteasomal degradation of SUMO1/sentrin-specific protease 1 (SENP1). These findings demonstrate that MEL-18 is a SUMO-dependent regulator of hormone receptors and suggest MEL-18 expression as a marker for determining the antihormonal therapy response in patients with breast cancer.
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MESH Headings
- Aminopyridines/administration & dosage
- Animals
- Antineoplastic Agents, Hormonal/pharmacology
- Antineoplastic Agents, Hormonal/therapeutic use
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Biomarkers, Tumor/biosynthesis
- Biomarkers, Tumor/genetics
- Breast Neoplasms/drug therapy
- Breast Neoplasms/metabolism
- Breast Neoplasms/mortality
- Breast Neoplasms/pathology
- Carcinoma, Ductal, Breast/drug therapy
- Carcinoma, Ductal, Breast/metabolism
- Carcinoma, Ductal, Breast/mortality
- Carcinoma, Ductal, Breast/pathology
- Cysteine Endopeptidases
- Drug Resistance, Neoplasm
- Endopeptidases/metabolism
- Estrogen Receptor alpha/analysis
- Estrogen Receptor alpha/biosynthesis
- Estrogen Receptor alpha/genetics
- Estrogens
- Female
- Humans
- Kaplan-Meier Estimate
- Mice
- Morpholines/administration & dosage
- Neoplasm Proteins/deficiency
- Neoplasm Proteins/genetics
- Neoplasm Proteins/physiology
- Neoplasm Transplantation
- Neoplasms, Hormone-Dependent/drug therapy
- Neoplasms, Hormone-Dependent/metabolism
- Neoplasms, Hormone-Dependent/mortality
- Neoplasms, Hormone-Dependent/pathology
- Polycomb Repressive Complex 1/deficiency
- Polycomb Repressive Complex 1/genetics
- Polycomb Repressive Complex 1/physiology
- Progesterone
- Proportional Hazards Models
- Proteasome Endopeptidase Complex/metabolism
- Protein Processing, Post-Translational/drug effects
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- RNA, Neoplasm/biosynthesis
- RNA, Neoplasm/genetics
- Receptor, ErbB-2/analysis
- Receptors, Progesterone/analysis
- Receptors, Progesterone/biosynthesis
- Receptors, Progesterone/genetics
- Sp1 Transcription Factor/metabolism
- Sumoylation/drug effects
- Tamoxifen/administration & dosage
- Tamoxifen/pharmacology
- Tamoxifen/therapeutic use
- Triple Negative Breast Neoplasms/drug therapy
- Triple Negative Breast Neoplasms/metabolism
- Triple Negative Breast Neoplasms/mortality
- Triple Negative Breast Neoplasms/pathology
- Tumor Suppressor Protein p53/metabolism
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Affiliation(s)
- Jeong-Yeon Lee
- Institute for Bioengineering and Biopharmaceutical Research (IBBR) and
| | - Hee-Young Won
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
| | - Ji-Hye Park
- Institute for Bioengineering and Biopharmaceutical Research (IBBR) and
| | - Hye-Yeon Kim
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
| | - Hee-Joo Choi
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
| | - Dong-Hui Shin
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
| | - Ju-Hee Kang
- National Cancer Center, Goyang-si, Gyeonggi-do, South Korea
| | - Jong-Kyu Woo
- College of Pharmacy, Gachon University, Incheon, South Korea
| | - Seung-Hyun Oh
- College of Pharmacy, Gachon University, Incheon, South Korea
| | - Taekwon Son
- Research Institute, Bio-Medical Science Co., Ltd., Daejeon, South Korea
| | - Jin-Woo Choi
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
| | - Sehwan Kim
- Data Science Center, Insilicogen Inc., Suwon-si, Gyeonggi-do, South Korea
| | - Hyung-Yong Kim
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
- Data Science Center, Insilicogen Inc., Suwon-si, Gyeonggi-do, South Korea
| | - Kijong Yi
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
| | - Ki-Seok Jang
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
| | - Young-Ha Oh
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
| | - Gu Kong
- Institute for Bioengineering and Biopharmaceutical Research (IBBR) and
- Department of Pathology, College of Medicine, Hanyang University, Seoul, South Korea
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6
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Sheridan JM, Ritchie ME, Best SA, Jiang K, Beck TJ, Vaillant F, Liu K, Dickins RA, Smyth GK, Lindeman GJ, Visvader JE. A pooled shRNA screen for regulators of primary mammary stem and progenitor cells identifies roles for Asap1 and Prox1. BMC Cancer 2015; 15:221. [PMID: 25879659 PMCID: PMC4399223 DOI: 10.1186/s12885-015-1187-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 03/12/2015] [Indexed: 12/31/2022] Open
Abstract
Background The molecular regulators that orchestrate stem cell renewal, proliferation and differentiation along the mammary epithelial hierarchy remain poorly understood. Here we have performed a large-scale pooled RNAi screen in primary mouse mammary stem cell (MaSC)-enriched basal cells using 1295 shRNAs against genes principally involved in transcriptional regulation. Methods MaSC-enriched basal cells transduced with lentivirus pools carrying shRNAs were maintained as non-adherent mammospheres, a system known to support stem and progenitor cells. Integrated shRNAs that altered culture kinetics were identified by next generation sequencing as relative frequency changes over time. RNA-seq-based expression profiling coupled with in vitro progenitor and in vivo transplantation assays was used to confirm a role for candidate genes in mammary stem and/or progenitor cells. Results Utilizing a mammosphere-based assay, the screen identified several candidate regulators. Although some genes had been previously implicated in mammary gland development, the vast majority of genes uncovered have no known function within the mammary gland. RNA-seq analysis of freshly purified primary mammary epithelial populations and short-term cultured mammospheres was used to confirm the expression of candidate regulators. Two genes, Asap1 and Prox1, respectively implicated in breast cancer metastasis and progenitor cell function in other systems, were selected for further analysis as their roles in the normal mammary gland were unknown. Both Prox1 and Asap1 were shown to act as negative regulators of progenitor activity in vitro, and Asap1 knock-down led to a marked increase in repopulating activity in vivo, implying a role in stem cell activity. Conclusions This study has revealed a number of novel genes that influence the activity or survival of mammary stem and/or progenitor cells. Amongst these, we demonstrate that Prox1 and Asap1 behave as negative regulators of mammary stem/progenitor function. Both of these genes have also been implicated in oncogenesis. Our findings provide proof of principle for the use of short-term cultured primary MaSC/basal cells in functional RNAi screens. Electronic supplementary material The online version of this article (doi:10.1186/s12885-015-1187-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Julie M Sheridan
- ACRF Stem Cells and Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,Molecular Genetics of Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,Department of Medical Biology, The University of Melbourne, Parkville, VIC, 3010, Australia.
| | - Matthew E Ritchie
- Molecular Medicine Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,School of Mathematics and Statistics, The University of Melbourne, Parkville, VIC, 3010, Australia.
| | - Sarah A Best
- ACRF Stem Cells and Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,Department of Medical Biology, The University of Melbourne, Parkville, VIC, 3010, Australia.
| | - Kun Jiang
- ACRF Stem Cells and Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia.
| | - Tamara J Beck
- ACRF Stem Cells and Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia.
| | - François Vaillant
- ACRF Stem Cells and Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,Department of Medical Biology, The University of Melbourne, Parkville, VIC, 3010, Australia.
| | - Kevin Liu
- ACRF Stem Cells and Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia.
| | - Ross A Dickins
- Molecular Medicine Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,Department of Medical Biology, The University of Melbourne, Parkville, VIC, 3010, Australia.
| | - Gordon K Smyth
- Bioinformatics Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,School of Mathematics and Statistics, The University of Melbourne, Parkville, VIC, 3010, Australia.
| | - Geoffrey J Lindeman
- ACRF Stem Cells and Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,Department of Medicine, The University of Melbourne, Parkville, VIC, 3010, Australia. .,Department of Medical Oncology, The Royal Melbourne Hospital, Grattan Street, Parkville, VIC, 3050, Australia.
| | - Jane E Visvader
- ACRF Stem Cells and Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, VIC, 3052, Australia. .,Department of Medical Biology, The University of Melbourne, Parkville, VIC, 3010, Australia.
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7
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Chen D, Forootan SS, Gosney JR, Forootan FS, Ke Y. Increased expression of Id1 and Id3 promotes tumorigenicity by enhancing angiogenesis and suppressing apoptosis in small cell lung cancer. Genes Cancer 2014; 5:212-25. [PMID: 25061504 PMCID: PMC4104762 DOI: 10.18632/genesandcancer.20] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Accepted: 07/04/2014] [Indexed: 12/31/2022] Open
Abstract
Constant deregulation of Id1 and Id3 has been implicated in a wide range of carcinomas. However, underlying molecular evidence for the joint role of Id1 and Id3 in the tumorigenicity of small cell lung cancer (SCLC) is sparse. Investigating the biological significance of elevated expression in SCLC cells, we found that Id1 and Id3 co-suppression resulted in significant reduction of proliferation rate, invasiveness and anchorage-independent growth. Suppressing both Id1 and Id3 expression also greatly reduced the average size of tumors produced by transfectant cells when inoculated subcutaneously into nude mice. Further investigation revealed that suppressed expression of Id1 and Id3 was accompanied by decreased angiogenesis and increased apoptosis. Therefore, the SCLC tumorigenicity suppression effect of double knockdown of Id1 and Id3 may be regulated through pathways of apoptosis and angiogenesis.
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Affiliation(s)
- Danqing Chen
- Molecular Pathology Laboratory, Department of Molecular and Clinical Cancer Medicine, Liverpool University, 5/6th Floor, Duncan Building, Daulby Street, Liverpool, L69 3GA, UK
| | - Shiva S Forootan
- Molecular Pathology Laboratory, Department of Molecular and Clinical Cancer Medicine, Liverpool University, 5/6th Floor, Duncan Building, Daulby Street, Liverpool, L69 3GA, UK
| | - John R Gosney
- Molecular Pathology Laboratory, Department of Molecular and Clinical Cancer Medicine, Liverpool University, 5/6th Floor, Duncan Building, Daulby Street, Liverpool, L69 3GA, UK
| | - Farzad S Forootan
- Molecular Pathology Laboratory, Department of Molecular and Clinical Cancer Medicine, Liverpool University, 5/6th Floor, Duncan Building, Daulby Street, Liverpool, L69 3GA, UK
| | - Youqiang Ke
- Molecular Pathology Laboratory, Department of Molecular and Clinical Cancer Medicine, Liverpool University, 5/6th Floor, Duncan Building, Daulby Street, Liverpool, L69 3GA, UK
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8
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Loss of the polycomb protein Mel-18 enhances the epithelial-mesenchymal transition by ZEB1 and ZEB2 expression through the downregulation of miR-205 in breast cancer. Oncogene 2013; 33:1325-35. [PMID: 23474752 DOI: 10.1038/onc.2013.53] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Revised: 12/30/2012] [Accepted: 01/21/2013] [Indexed: 12/19/2022]
Abstract
The epithelial-mesenchymal transition (EMT) is the pivotal mechanism underlying the initiation of cancer invasion and metastasis. Although Mel-18 has been implicated in several biological processes in cancer, its function in the EMT of human cancers has not yet been studied. Here, we demonstrate that Mel-18 negatively regulates the EMT by epigenetically modulating miR-205. We identified miR-205 as a novel target of Mel-18 using a microRNA microarray analysis and found that Mel-18 increased miR-205 transcription by the inhibition of DNA methyltransferase-mediated DNA methylation of the miR-205 promoter, thereby downregulating its target genes, ZEB1 and ZEB2. Furthermore, the loss of Mel-18 promoted ZEB1- and ZEB2-mediated downregulation of E-cadherin transcription and also enhanced the expression of mesenchymal markers, leading to increased migration and invasion in MCF-7 cells. In MDA-MB-231 cells, Mel-18 overexpression restored E-cadherin expression, resulting in reduced migration and invasion. These effects were reversed by miR-205 overexpression or inhibition. A tumor xenograft with Mel-18 knockdown MCF-7 cells consistently showed increased ZEB1 and ZEB2 expression and decreased E-cadherin expression. Taken together, these results suggest that Mel-18 functions as a tumor suppressor by its novel negative control of the EMT, achieved through regulating the expression of miR-205 and its target genes, ZEB1 and ZEB2.
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9
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Inhibitor of DNA binding 1 (Id1) induces differentiation and proliferation of mouse embryonic carcinoma P19CL6 cells. Biochem Biophys Res Commun 2011; 412:253-9. [PMID: 21820417 DOI: 10.1016/j.bbrc.2011.07.079] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Accepted: 07/20/2011] [Indexed: 11/21/2022]
Abstract
The inhibitor of DNA binding (Id) family of genes encodes negative regulators of basic helix-loop-helix transcription factors and has been implicated in such diverse cellular processes as differentiation, proliferation, apoptosis and migration. Id knockout mouse embryos display multiple cardiac defects but the specific role of Id1 in cardiac differentiation is unclear. In the present study, we investigated the function of Id1 in DMSO-induced P19CL6 cells, a widely-accepted cell model of cardiac differentiation. We found that Id1 was upregulated during the cardiac differentiation of P19CL6 cells. The expression of cardiac specific marker genes, Gata4, α-MHC and ISL1, was upregulated in P19CL6 cells stably transfected with Id1 (P19CL6-Id1) during cardiac differentiation. The overexpression of Id1 reduced the number of cells in G1 phase and increased the cell population in G2, M and S phases, while knockdown of Id1 increased the number of cells in G1 phase from 48.6 ± 2.51% to 62.2 ± 1.52% at day 0 of cardiac induction, and from 52.5 ± 3.41% to 63.7 ± 1.02% at day 3 after cardiac induction, indicating that Id1 promoted proliferation of P19CL6 cells. Luciferase assays showed that the activity of TOP flash was higher in P19CL6-Id1 cells than wildtype P19CL6 cells, while Id1 expression was also upregulated in P19CL6 cells treated with Wnt3a or LiCl. This indicates that there may be positive feedback between Id1 and Wnt signaling which plays an important role in cardiac differentiation.
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