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Vijay Anand J, Jaswal S, Jena MK, Kumar S, Kaushik JK, Mohanty AK. Novel Interacting Partners of MGP-40, a Chitinase-Like Protein in Buffalo Mammary Epithelial Cells. Cell Biochem Biophys 2025; 83:2127-2137. [PMID: 39579292 DOI: 10.1007/s12013-024-01623-z] [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] [Accepted: 11/12/2024] [Indexed: 11/25/2024]
Abstract
Mammary Gland Protein-40 (MGP-40), also known as chitinase-3-like protein 1 (CHI3L1), is involved in critical biological processes such as inflammation, tissue remodeling, and cell proliferation, especially during the involution phase of the mammary gland. This study aimed to explore the molecular mechanisms of MGP-40 by identifying its novel interacting partners in buffalo mammary epithelial cells (BuMECs). Stable overexpression of MGP-40 in BuMECs was achieved through transfection with the pCIneo-MGP-40 vector, followed by G418 selection and confirmation by Western blot analysis. To identify interacting proteins, Co-immunoprecipitation (Co-IP) of BuMEC lysate using an anti-YKL-40 antibody was performed, and the eluted proteins were analyzed using SDS-PAGE and mass spectrometry (MALDI-TOF/TOF). The analysis revealed several interacting proteins, including synaptotagmin-like 3, Ras-related Rab19, RIB34A-like protein with coiled coils, and ATP synthase subunit g. These interacting partners suggest that MGP-40 is involved in crucial cellular processes like vesicle trafficking, cytoskeletal organization, and energy metabolism, extending its known functions in inflammation and tissue remodeling. Notably, the interactions with synaptotagmin-like 3 and Rab proteins emphasize MGP-40's potential role in vesicular transport, essential for milk production in mammary epithelial cells, while the association with ATP synthase subunit g links MGP-40 to energy regulation during lactation. These findings provide preliminary insights into the potential roles of MGP-40 in mammary gland physiology, particularly in cellular processes such as vesicle trafficking and energy metabolism. Further studies, including in vivo validation, are essential to confirm these interactions and clarify their relevance to mammary gland function and pathology.
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Affiliation(s)
- J Vijay Anand
- Department of Animal Biotechnology, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - Shalini Jaswal
- Animal Biotechnology Centre, Indian Council of Agricultural Research-National Dairy Research Institute (NDRI), Karnal, India
| | - Manoj Kumar Jena
- Department of Biotechnology, School of Bioengineering and Biosciences, Lovely Professional University (LPU), Phagwara, Punjab, 144411, India
| | - Sudarshan Kumar
- Animal Biotechnology Centre, Indian Council of Agricultural Research-National Dairy Research Institute (NDRI), Karnal, India
| | - Jai Kumar Kaushik
- Animal Biotechnology Centre, Indian Council of Agricultural Research-National Dairy Research Institute (NDRI), Karnal, India
| | - Ashok Kumar Mohanty
- Animal Biotechnology Centre, Indian Council of Agricultural Research-National Dairy Research Institute (NDRI), Karnal, India.
- Indian Council of Agricultural Research-Central Institute for Research on Cattle (CIRC), Meerut, India.
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Zhang L, Liu Z, Zhu J. In silico screening using bulk and single-cell RNA-seq data identifies RIMS2 as a prognostic marker in basal-like breast cancer: A retrospective study. Medicine (Baltimore) 2021; 100:e25414. [PMID: 33879671 PMCID: PMC8078249 DOI: 10.1097/md.0000000000025414] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 03/10/2021] [Indexed: 02/05/2023] Open
Abstract
Single-cell RNA-seq has become a powerful tool to understand tumor cell heterogenicity. This study tried to screen prognosis-related genes in basal-like breast tumors and evaluate their correlations with cellular states at the single-cell level.Bulk RNA-seq data of basal-like tumor cases from The Cancer Genome Atlas-Breast Cancer (TCGA-BRCA) and single-cell RNA-seq from GSE75688 were retrospectively reviewed. Kaplan-Meier survival curves, univariate and multivariate analysis based on Cox regression model were conducted for survival analysis. Gene set enrichment analysis (GSEA) and single-cell cellular functional state analysis were performed.Twenty thousand five hundred thirty genes with bulk RNA-seq data in TCGA were subjected to screening. Preliminary screening identified 10 candidate progression-related genes, including CDH19, AQP5, SDR16C5, NCAN, TTYH1, XAGE2, RIMS2, GZMB, LY6D, and FAM3B. By checking their profiles using single-cell RNA-seq data, only CDH19, SDR16C5, TTYH1, and RIMS2 had expression in primary triple-negative breast cancer (TNBC) cells. Prognostic analysis only confirmed that RIMS2 expression was an independent prognostic indicator of favorable progression free survival (PFS) (HR: 0.78, 95%: 0.64-0.95, P = .015). GSEA analysis showed that low RIMS2 group expression had genes significantly enriched in DNA Repair, and MYC Targets V2. Among the 89 basal-like cells, RIMS2 expression was negatively correlated with DNA repair and epithelial-to-mesenchymal transition (EMT).RIMS2 expression was negatively associated with DNA repair capability of basal-like breast tumor cells and might serve as an independent indicator of favorable PFS.
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Affiliation(s)
- Lingyun Zhang
- Department of Thyroid Surgery
- Laboratory of Thyroid and Parathyroid Disease, Frontiers Science Center for Disease-Related Molecular Network
| | - Zheng Liu
- Nursing Department, West China School of Nursing, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Jingqiang Zhu
- Department of Thyroid Surgery
- Laboratory of Thyroid and Parathyroid Disease, Frontiers Science Center for Disease-Related Molecular Network
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Whitehead CA, Kaye AH, Drummond KJ, Widodo SS, Mantamadiotis T, Vella LJ, Stylli SS. Extracellular vesicles and their role in glioblastoma. Crit Rev Clin Lab Sci 2019:1-26. [PMID: 31865806 DOI: 10.1080/10408363.2019.1700208] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Research on the role of extracellular vesicles (EVs) in disease pathogenesis has been rapidly growing over the last two decades. As EVs can mediate intercellular communication, they can ultimately facilitate both normal and pathological processes through the delivery of their bioactive cargo, which may include nucleic acids, proteins and lipids. EVs have emerged as important regulators of brain tumors, capable of transferring oncogenic proteins, receptors, and small RNAs that may support brain tumor progression, including in the most common type of brain cancer, glioma. Investigating the role of EVs in glioma is crucial, as the most malignant glioma, glioblastoma (GBM), is incurable with a dismal median survival of 12-15 months. EV research in GBM has primarily focused on circulating brain tumor-derived vesicles in biofluids, such as blood and cerebrospinal fluid (CSF), investigating their potential as diagnostic and prognostic biomarkers. Gaining a greater understanding of the role of EVs and their cargo in brain tumor progression may contribute to the discovery of novel diagnostics and therapeutics. In this review, we summarize the known and emerging functions of EVs in glioma biology and pathogenesis, as well as their emerging biomarker potential.
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Affiliation(s)
- Clarissa A Whitehead
- Department of Surgery, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Australia
| | - Andrew H Kaye
- Department of Surgery, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Australia.,Department of Neurosurgery, Hadassah Hebrew University Medical Centre, Jerusalem, Israel
| | - Katharine J Drummond
- Department of Surgery, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Australia.,Department of Neurosurgery, The Royal Melbourne Hospital, Parkville, Australia
| | - Samuel S Widodo
- Department of Microbiology & Immunology, School of Biomedical Sciences, The University of Melbourne, Parkville, Australia
| | - Theo Mantamadiotis
- Department of Surgery, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Australia.,Department of Microbiology & Immunology, School of Biomedical Sciences, The University of Melbourne, Parkville, Australia
| | - Laura J Vella
- Department of Surgery, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Australia.,The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Australia
| | - Stanley S Stylli
- Department of Surgery, The Royal Melbourne Hospital, The University of Melbourne, Parkville, Australia.,Department of Neurosurgery, Hadassah Hebrew University Medical Centre, Jerusalem, Israel
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Morgan NE, Cutrona MB, Simpson JC. Multitasking Rab Proteins in Autophagy and Membrane Trafficking: A Focus on Rab33b. Int J Mol Sci 2019; 20:ijms20163916. [PMID: 31408960 PMCID: PMC6719199 DOI: 10.3390/ijms20163916] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 07/30/2019] [Accepted: 08/09/2019] [Indexed: 12/25/2022] Open
Abstract
Autophagy (particularly macroautophagy) is a bulk degradation process used by eukaryotic cells in order to maintain adequate energy levels and cellular homeostasis through the delivery of long-lived proteins and organelles to the lysosome, resulting in their degradation. It is becoming increasingly clear that many of the molecular requirements to fulfil autophagy intersect with those of conventional and unconventional membrane trafficking pathways. Of particular interest is the dependence of these processes on multiple members of the Rab family of small GTP binding proteins. Rab33b is a protein that localises to the Golgi apparatus and has suggested functions in both membrane trafficking and autophagic processes. Interestingly, mutations in the RAB33B gene have been reported to cause the severe skeletal disorder, Smith–McCort Dysplasia; however, the molecular basis for Rab33b in this disorder remains to be determined. In this review, we focus on the current knowledge of the participation of Rab33b and its interacting partners in membrane trafficking and macroautophagy, and speculate on how its function, and dysfunction, may contribute to human disease.
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Affiliation(s)
- Niamh E Morgan
- School of Biology and Environmental Science & Conway Institute of Biomolecular and Biomedical Research, University College Dublin (UCD), D04 N2E5 Dublin, Ireland
| | - Meritxell B Cutrona
- School of Biology and Environmental Science & Conway Institute of Biomolecular and Biomedical Research, University College Dublin (UCD), D04 N2E5 Dublin, Ireland
| | - Jeremy C Simpson
- School of Biology and Environmental Science & Conway Institute of Biomolecular and Biomedical Research, University College Dublin (UCD), D04 N2E5 Dublin, Ireland.
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O-GlcNAcylation on Rab3A attenuates its effects on mitochondrial oxidative phosphorylation and metastasis in hepatocellular carcinoma. Cell Death Dis 2018; 9:970. [PMID: 30237463 PMCID: PMC6148238 DOI: 10.1038/s41419-018-0961-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 08/07/2018] [Accepted: 08/20/2018] [Indexed: 12/13/2022]
Abstract
Rab3A is a small Ras-like GTPase critical for membrane traffic. Although the functions of Rab3A have been reported in several cancers, the roles of Rab3A in hepatocellular carcinoma (HCC) have never been determined. To investigate the potential roles of Rab3A in HCC progression, we first determined Rab3A levels in HCC tissues and observed upregulated mRNA and protein levels of Rab3A in most tumor tissues. However, in vitro data showed that decreasing Rab3A in most HCC cell lines conferred no significant effects and overexpressing Rab3A in PLC/PRF/5 cells even inhibited migration and invasion. Meanwhile, the upregulation of Rab3A in HCC patients did not correlate with metastasis or overall survival of HCC patients. These contradict data suggested that Rab3A might act as metastatic suppressor and its effects might be attenuated in most HCC cells. Further experiments revealed that O-GlcNAcylation on Rab3A was key for attenuating Rab3A-mediated effects by regulating its GTP-binding activity, and verified the effects of Rab3A and its aberrant O-GlcNAcylation on HCC metastasis in vitro and in vivo. We also found that Rab3A and its O-GlcNAcylation had opposite roles in mitochondria oxidative phosphorylation (mtOXPHOS), and their functions on HCC metastasis were partially depended on their effects on metabolic reprogramming.
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Lee S, Kelleher SL. Molecular regulation of lactation: The complex and requisite roles for zinc. Arch Biochem Biophys 2016; 611:86-92. [DOI: 10.1016/j.abb.2016.04.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 03/10/2016] [Accepted: 04/04/2016] [Indexed: 12/22/2022]
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Wright PK, Jones SB, Ardern N, Ward R, Clarke RB, Sotgia F, Lisanti MP, Landberg G, Lamb R. 17β-estradiol regulates giant vesicle formation via estrogen receptor-alpha in human breast cancer cells. Oncotarget 2015; 5:3055-65. [PMID: 24931391 PMCID: PMC4102791 DOI: 10.18632/oncotarget.1824] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A significant proportion of the genes regulated by 17-beta-estradiol (E2) via estrogen receptor alpha (ERα) have roles in vesicle trafficking in breast cancer. Intracellular vesicle trafficking and extracellular vesicles have important roles in tumourigenesis. Here we report the discovery of giant (3-42μm) intracellular and extracellular vesicles (GVs) and the role of E2 on vesicle formation in breast cancer (BC) cell lines using three independent live cell imaging techniques. Large diameter vesicles, GVs were also identified in a patient-derived xenograft BC model, and in invasive breast carcinoma tissue. ERα-positive (MCF-7 and T47D) BC cell lines demonstrated a significant increase in GV formation after stimulation with E2 which was reversed by tamoxifen. ERα-negative (MDA-MB-231 and MDA-MB-468) BC cell lines produced GVs independently of E2 and tamoxifen. These results indicate the existence of both intracellular and extracellular vesicles with considerably larger dimensions than generally recognised with BC cells and suggest that the GVs are regulated by E2 via ERα in ERα-positive BC but by E2-independent mechanisms in ER-ve BC.
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Affiliation(s)
- Paul K Wright
- Department of Histopathology, Manchester Royal Infirmary, Central Manchester University Hospitals NHS Foundation Trust, Manchester, UK
| | | | | | | | | | | | | | | | - Rebecca Lamb
- Breakthrough Breast Cancer Research Unit, University of Manchester, Manchester, UK
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Maringer K, Saheb E, Bush J. Vesicular Trafficking Defects, Developmental Abnormalities, and Alterations in the Cellular Death Process Occur in Cell Lines that Over-Express Dictyostelium GTPase, Rab2, and Rab2 Mutants. BIOLOGY 2014; 3:514-35. [PMID: 25157910 PMCID: PMC4192625 DOI: 10.3390/biology3030514] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 07/29/2014] [Accepted: 08/13/2014] [Indexed: 01/10/2023]
Abstract
Small molecular weight GTPase Rab2 has been shown to be a resident of pre-Golgi intermediates and required for protein transport from the ER to the Golgi complex, however, the function of Rab2 in Dictyostelium has yet to be fully characterized. Using cell lines that over-express DdRab2, as well as cell lines over-expressing constitutively active (CA), and dominant negative (DN) forms of the GTPase, we report a functional role in vesicular transport specifically phagocytosis, and endocytosis. Furthermore, Rab2 like other GTPases cycles between an active GTP-bound and an inactive GDP-bound state. We found that this GTP/GDP cycle for DdRab2 is crucial for normal Dictyostelium development and cell-cell adhesion. Similar to Rab5 and Rab7 in C. elegans, we found that DdRab2 plays a role in programmed cell death, possibly in the phagocytic removal of apoptotic corpses.
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Affiliation(s)
- Katherine Maringer
- Department of Biology, University of Arkansas at Little Rock, 2801 S. University Ave., Little Rock, AR 72205, USA.
| | - Entsar Saheb
- Department of Biology, University of Arkansas at Little Rock, 2801 S. University Ave., Little Rock, AR 72205, USA.
| | - John Bush
- Department of Biology, University of Arkansas at Little Rock, 2801 S. University Ave., Little Rock, AR 72205, USA.
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Truchet S, Chat S, Ollivier-Bousquet M. Milk secretion: The role of SNARE proteins. J Mammary Gland Biol Neoplasia 2014; 19:119-30. [PMID: 24264376 DOI: 10.1007/s10911-013-9311-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 11/13/2013] [Indexed: 12/21/2022] Open
Abstract
During lactation, polarized mammary epithelial secretory cells (MESCs) secrete huge quantities of the nutrient molecules that make up milk, i.e. proteins, fat globules and soluble components such as lactose and minerals. Some of these nutrients are only produced by the MESCs themselves, while others are to a great extent transferred from the blood. MESCs can thus be seen as a crossroads for both the uptake and the secretion with cross-talks between intracellular compartments that enable spatial and temporal coordination of the secretion of the milk constituents. Although the physiology of lactation is well understood, the molecular mechanisms underlying the secretion of milk components remain incompletely characterized. Major milk proteins, namely caseins, are secreted by exocytosis, while the milk fat globules are released by budding, being enwrapped by the apical plasma membrane. Prolactin, which stimulates the transcription of casein genes, also induces the production of arachidonic acid, leading to accelerated casein transport and/or secretion. Because of their ability to form complexes that bridge two membranes and promote their fusion, SNARE (Soluble N-ethylmaleimide-Sensitive Factor Attachment Protein Receptor) proteins are involved in almost all intracellular trafficking steps and exocytosis. As SNAREs can bind arachidonic acid, they could be the effectors of the secretagogue effect of prolactin in MESCs. Indeed, some SNAREs have been observed between secretory vesicles and lipid droplets suggesting that these proteins could not only orchestrate the intracellular trafficking of milk components but also act as key regulators for both the coupling and coordination of milk product secretion in response to hormones.
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Affiliation(s)
- Sandrine Truchet
- INRA, UR1196 Génomique et Physiologie de la Lactation, 78352, Jouy-en-Josas Cedex, France,
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Abstract
The mammary epithelium coordinates the uptake of milk precursors and the transport of milk components in order to produce milk of relatively constant composition at a particular stage of lactation, as long as the mammary gland is healthy. The mammary epithelial cell controls the uptake of blood-borne molecules at its basal side and the release of products into milk at its apical side, through mechanisms of internalization (endocytosis) and mechanisms of release (exocytosis). These events are strictly dependent on the physiological stage of the mammary gland. This review addresses the mechanisms responsible for these processes and points out new questions that remain to be answered concerning possible interconnections between them, for an optimal milk secretion.
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Chat S, Layani S, Mahaut C, Henry C, Chanat E, Truchet S. Characterisation of the potential SNARE proteins relevant to milk product release by mouse mammary epithelial cells. Eur J Cell Biol 2011; 90:401-13. [DOI: 10.1016/j.ejcb.2011.01.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 12/28/2010] [Accepted: 01/05/2011] [Indexed: 11/28/2022] Open
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Hendrix A, Westbroek W, Bracke M, De Wever O. An ex(o)citing machinery for invasive tumor growth. Cancer Res 2010; 70:9533-7. [PMID: 21098711 DOI: 10.1158/0008-5472.can-10-3248] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Cancer cells communicate with the environment through delivery of surface proteins, release of soluble factors (growth factors and cytokines), and sophisticated nanovehicles (exosomes) for establishment of invasive tumor growth. This communication occurs in part through constitutive exocytosis, regulated exocytosis, or release of intraluminal vesicles, and is modulated by small Rab GTPases, the master regulators of vesicle traffic. We studied Rab GTPases implicated in regulated exocytosis and showed a unique role for Rab27B in invasive tumor growth. Emerging evidence indicates that various exocytic routes are implemented by cancer cells to relay crucial information for fostering growth, migration, and matrix degradation.
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Affiliation(s)
- An Hendrix
- Laboratory of Experimental Cancer Research, Department of Radiation Oncology and Experimental Cancer Research, Ghent University Hospital, Ghent, Belgium
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Hackenbeck T, Huber R, Schietke R, Knaup KX, Monti J, Wu X, Klanke B, Frey B, Gaipl U, Wullich B, Ferbus D, Goubin G, Warnecke C, Eckardt KU, Wiesener MS. The GTPase RAB20 is a HIF target with mitochondrial localization mediating apoptosis in hypoxia. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2010; 1813:1-13. [PMID: 21056597 DOI: 10.1016/j.bbamcr.2010.10.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Revised: 10/12/2010] [Accepted: 10/29/2010] [Indexed: 01/18/2023]
Abstract
Hypoxia is a common pathogenic stress, which requires adaptive activation of the Hypoxia-inducible transcription factor (HIF). In concert transcriptional HIF targets enhance oxygen availability and simultaneously reduce oxygen demand, enabling survival in a hypoxic microenvironment. Here, we describe the characterization of a new HIF-1 target gene, Rab20, which is a member of the Rab family of small GTP-binding proteins, regulating intracellular trafficking and vesicle formation. Rab20 is directly regulated by HIF-1, resulting in rapid upregulation of Rab20 mRNA as well as protein under hypoxia. Furthermore, exogenous as well as endogenous Rab20 protein colocalizes with mitochondria. Knockdown studies reveal that Rab20 is involved in hypoxia induced apoptosis. Since mitochondria play a key role in the control of cell death, we suggest that regulating mitochondrial homeostasis in hypoxia is a key function of Rab20. Furthermore, our study implicates that cellular transport pathways play a role in oxygen homeostasis. Hypoxia-induced Rab20 may influence tissue homeostasis and repair during and after hypoxic stress.
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Geng L, Li Q. Expression and function of heregulin-alpha and its receptors in the mouse mammary gland. SCIENCE CHINA-LIFE SCIENCES 2010; 53:1015-24. [PMID: 20821301 DOI: 10.1007/s11427-010-4042-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Accepted: 05/26/2010] [Indexed: 11/26/2022]
Abstract
Heregulin-alpha (HRGalpha) is a cytokine secreted by the mammary mesenchyme, adjacent to lobuloalveolar structures. To understand the role of HRGalpha and its receptors in mammary glands, and the underlying mechanisms, we performed this study to determine the expression and localization of HRGalpha and its receptors ErbB2 and ErbB3. We also determined the role of HRGalpha in the development of mammary glands, beta-casein expression and secretion, Rab3A protein expression and the phosphorylation of HRGalpha signaling molecules using confocal laser scanning microscopy, tissue culture, capillary electrophoresis, Western blotting and enzyme-linked immunosorbent assays. We found that a peak was on pregnancy day 15. Changes of ErbB2 and ErbB3 expression were positively and linearly correlated with HRGalpha, indicating that HRGalpha positively regulates ErbB2 and ErbB3 expression. During pregnancy, HRGalpha enhanced the phosphorylation of STAT5, p42/p44, p38, PKC and Rab3A protein expression, stimulated the proliferation and differentiation of the ductal epithelial cells of mammary glands, and increased and maintained the expression and secretion of beta-casein. During lactation, HRGalpha enhanced the phosphorylation of STAT5 and p38, inhibited the phosphorylation of PKC and Rab3A protein expression, maintained the morphology of the mammary glands and increased the secretion of lactoprotein to reduce the expression of beta-casein in mammary epithelial cells. During involution, HRGalpha induced the phosphorylation of STAT3 and Rab3A protein expression, and inhibited the phosphorylation of PKC to stimulate the degeneration of mammary epithelial cells. It also inhibited the secretion of beta-casein, resulting in increased levels of beta-casein in mammary epithelial cells.
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Affiliation(s)
- LiJing Geng
- Institute of Food Science and Engineering, Liaoning Medical University, Jinzhou, China
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Jacobs DT, Weigert R, Grode KD, Donaldson JG, Cheney RE. Myosin Vc is a molecular motor that functions in secretory granule trafficking. Mol Biol Cell 2009; 20:4471-88. [PMID: 19741097 DOI: 10.1091/mbc.e08-08-0865] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Class V myosins are actin-based motor proteins that have critical functions in organelle trafficking. Of the three class V myosins expressed in mammals, relatively little is known about Myo5c except that it is abundant in exocrine tissues. Here we use MCF-7 cells to identify the organelles that Myo5c associates with, image the dynamics of Myo5c in living cells, and test the functions of Myo5c. Endogenous Myo5c localizes to two distinct compartments: small puncta and slender tubules. Myo5c often exhibits a highly polarized distribution toward the leading edge in migrating cells and is clearly distinct from the Myo5a or Myo5b compartments. Imaging with GFP-Myo5c reveals that Myo5c puncta move slowly (approximately 30 nm/s) and microtubule independently, whereas tubules move rapidly (approximately 440 nm/s) and microtubule dependently. Myo5c puncta colocalize with secretory granule markers such as chromogranin A and Rab27b, whereas Myo5c tubules are labeled by Rab8a. TIRF imaging indicates that the granules can be triggered to undergo secretion. To test if Myo5c functions in granule trafficking, we used the Myo5c tail as a dominant negative and found that it dramatically perturbs the distribution of granule markers. These results provide the first live-cell imaging of Myo5c and indicate that Myo5c functions in secretory granule trafficking.
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Affiliation(s)
- Damon T Jacobs
- Department of Cell and Molecular Physiology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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fps/fes knockout mice display a lactation defect and the fps/fes tyrosine kinase is a component of E-cadherin-based adherens junctions in breast epithelial cells during lactation. Exp Cell Res 2009; 315:2929-40. [PMID: 19732771 DOI: 10.1016/j.yexcr.2009.08.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2009] [Revised: 08/21/2009] [Accepted: 08/25/2009] [Indexed: 12/18/2022]
Abstract
The fps/fes proto-oncogene encodes a cytoplasmic protein-tyrosine kinase implicated in vesicular trafficking and cytokine and growth factor signaling in hematopoietic, neuronal, vascular endothelial and epithelial lineages. Genetic evidence has suggested a tumor suppressor role for Fps/Fes in breast and colon. Here we used fps/fes knockout mice to investigate potential roles for this kinase in development and function of the mammary gland. Fps/Fes expression was induced during pregnancy and lactation, and its kinase activity was dramatically enhanced. Milk protein and fat composition from nursing fps/fes-null mothers was normal; however, pups reared by them gained weight more slowly than pups reared by wild-type mothers. Fps/Fes displayed a predominantly dispersed punctate intracellular distribution which was consistent with vesicles within the luminal epithelial cells of lactating breast, while a small fraction co-localized with beta-catenin and E-cadherin on their basolateral surfaces. Fps/Fes was found to be a component of the E-cadherin adherens junction (AJ) complex; however, the phosphotyrosine status of beta-catenin and core AJ components in fps/fes-null breast tissue was unaltered, and epithelial cell AJs and gland morphology were intact. We conclude that Fps/Fes is not essential for the maintenance of epithelial cell AJs in the lactating breast but may instead play important roles in vesicular trafficking and milk secretion.
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Yu M, Zloty D, Cowan B, Shapiro J, Haegert A, Bell RH, Warshawski L, Carr N, McElwee KJ. Superficial, nodular, and morpheiform basal-cell carcinomas exhibit distinct gene expression profiles. J Invest Dermatol 2008; 128:1797-805. [PMID: 18200053 DOI: 10.1038/sj.jid.5701243] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Basal-cell carcinoma (BCC), the most common neoplasm in humans, occurs in a variety of morphological presentations. The mechanisms of BCC development downstream of the initial genetic mutations are not well understood, and different BCC morphological presentations might exhibit distinct gene expression patterns. We investigated superficial (n=8), nodular (n=8), and morpheiform (n=7) BCCs using 21K cDNA microarrays. Global gene expression profiles between respective BCC subtypes, and as compared with normal skin (n=8), were statistically defined by significance analysis of microarrays (SAM). Thirty-seven genes were subsequently validated by quantitative reverse transcriptase-PCR analysis using an expanded set of 31 BCCs. Gene ontology analysis indicated that gene expression patterns of BCC subtypes in multiple biological processes showed significant variation, particularly in genes associated with the mitogen-activated protein kinase (MAPK) pathway. Notably, genes involved in response to DNA-damage stimulus were uniquely upregulated in morpheiform BCCs. Our results indicate a relative similarity in gene expression between nodular and superficial BCC subtypes. In contrast, morpheiform BCCs are more diverse, with gene expression patterns consistent with their more "invasive" phenotype. These data may help us understand the complex behavior of BCC subtypes and may eventually lead to new therapeutic strategies.
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Affiliation(s)
- Mei Yu
- Department of Dermatology and Skin Science, University of British Columbia, Vancouver, British Columbia, Canada
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18
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Abstract
The human epidermal growth factor (EGF) receptor (HER) family of receptor tyrosine kinases has frequently been implicated in cancer. Apart from overexpression or mutation of these receptors, also the aberrant autocrine or paracrine activation of HERs by EGF-like ligands may be important in cancer progression. Neuregulins constitute a family of EGF-like ligands that bind to HER3 or HER4, preferably forming heterodimers with the orphan receptor HER2. Mesenchymal neuregulin typically serves as a pro-survival and pro-differentiation signal for adjacent epithelia. Disruption of the balance between proliferation and differentiation, because of autocrine production by the epithelial cells, increased sensitivity to paracrine signals or disruption of the spatial organization, may lead to constitutive receptor activation, in the absence of receptor overexpression. Consequently, the analysis of ligand expression and/or activated receptors in tumor samples may broaden the group of patients that can benefit from targeted therapies.
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Affiliation(s)
- Christophe Stove
- Laboratory of Experimental Cancerology, Department of Radiotherapy and Nuclear Medicine, Ghent University Hospital, Ghent, Belgium
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19
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Powell RR, Temesvari LA. Involvement of a Rab8-like protein of Dictyostelium discoideum, Sas1, in the formation of membrane extensions, secretion and adhesion during development. MICROBIOLOGY-SGM 2004; 150:2513-2525. [PMID: 15289548 DOI: 10.1099/mic.0.27073-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Establishment of cell-cell adhesions, regulation of actin, and secretion are critical during development. Rab8-like GTPases have been shown to modulate these cellular events, suggesting an involvement in developmental processes. To further elucidate the function of Rab8-like GTPases in a developmental context, a Rab8-related protein (Sas1) of Dictyostelium discoideum was examined, the expression of which increases at the onset of development. Dictyostelium cell lines expressing inactive (N128I mutant) and constitutively active (Q74L mutant) Sas1 as green fluorescent protein (GFP)-Sas1 chimeras were generated. Cells expressing Sas1Q74L displayed numerous actin-rich membrane protrusions, increased secretion, and were unable to complete development. In particular, these cells demonstrated a reduction in adhesion as well as in the levels of a cell adhesion molecule, gp24 (DdCAD-1). In contrast, cells expressing Sas1N128I exhibited increased cell-cell adhesion and increased levels of gp24. Counting factor is a multisubunit signalling complex that is secreted in early development and controls aggregate size by negatively regulating the levels of cell adhesion molecules, including gp24. Interestingly, the Sas1Q74L mutant demonstrated increased levels of extracellular countin, a subunit of counting factor, suggesting that Sas1 may regulate trafficking of counting factor components. Together, the data suggest that Sas1 may be a key regulator of actin, adhesion and secretion during development.
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Affiliation(s)
- Rhonda R Powell
- Department of Biological Sciences, 132 Long Hall, Clemson University, Clemson, SC 29634, USA
| | - Lesly A Temesvari
- Department of Biological Sciences, 132 Long Hall, Clemson University, Clemson, SC 29634, USA
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20
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Lee GJ, Sohn EJ, Lee MH, Hwang I. The Arabidopsis rab5 homologs rha1 and ara7 localize to the prevacuolar compartment. PLANT & CELL PHYSIOLOGY 2004; 45:1211-20. [PMID: 15509844 DOI: 10.1093/pcp/pch142] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Rha1, an Arabidopsis Rab5 homolog, plays a critical role in vacuolar trafficking in plant cells. In this study, we investigated the localization of Rha1 and Ara7, two Arabidopsis proteins that have highly similar amino acid sequence homology to Rab5 in animal cells. Both Ara7 and Rha1 gave a punctate staining pattern and colocalized when transiently expressed as GFP- (green fluorescent protein) or small epitope-tagged forms in Arabidopsis protoplasts. In protoplasts, transiently expressed Rha1 and Ara7 colocalized with AtPEP12p and VSR(At-1), two proteins that are known to be present at the prevacuolar compartment (PVC). Furthermore, endogenous Rha1 also gave a punctate staining pattern and colocalized with AtPEP12p to the PVC. Mutations in the first and second GTP-binding motifs alter the localizations of GFP: Rha1[S24N] in the cytosol and Rha1[Q69L] in the tonoplast of the central vacuole. Also, mutations in the effector domain and the prenylation site inhibit membrane association of Rha1. Based on these results, we propose that Rha1 and Ara7 localize to the PVC and that GTP-binding motifs as well as the effector domain are important for localization of Rha1 to the PVC.
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Affiliation(s)
- Gil-Je Lee
- Center for Plant Intracellular Trafficking and Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang, 790-784 Korea
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21
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Amin DN, Perkins AS, Stern DF. Gene expression profiling of ErbB receptor and ligand-dependent transcription. Oncogene 2003; 23:1428-38. [PMID: 14973552 DOI: 10.1038/sj.onc.1207257] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Overexpression of ErbB2 and ErbB4 receptors in breast cancers may be accompanied by contrasting clinical outcomes. To investigate the molecular mechanisms contributing to these differences, we undertook a comparative study of gene expression regulated by the two receptors. Agonistic antibodies were employed to activate ErbB2 and ErbB4 in isolation from the other ErbBs in breast cancer cells. Gene expression profiling using a 16 755-gene oligonucleotide array was performed to identify transcriptional targets of receptor activation. Our results indicate that, in the same cell line, ErbB2 and ErbB4 activation influence gene transcription differentially. Although there are genes that are regulated by signaling from both receptors, there are also receptor-specific targets that are preferentially regulated by each receptor. We further show that two ligands acting via the same receptor homodimer may activate different subsets of genes. Many of the induced genes are hitherto unidentified targets of ErbB signaling. These include ErbB4 targets EPS15R, GATA4, and RAB2 and ErbB2-activated HRY/HES1 and PPAP2A. Targets of ErbB2 homodimer signaling may be especially important as markers in breast cancer, where ErbB2 homodimerization mediated by overexpression and ligand-independent activation is common.
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Affiliation(s)
- Dhara N Amin
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06510, USA
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22
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Wang RA, Vadlamudi RK, Bagheri-Yarmand R, Beuvink I, Hynes NE, Kumar R. Essential functions of p21-activated kinase 1 in morphogenesis and differentiation of mammary glands. J Cell Biol 2003; 161:583-92. [PMID: 12732616 PMCID: PMC2172951 DOI: 10.1083/jcb.200212066] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Although growth factors have been shown to influence mammary gland development, the nature of downstream effectors remains elusive. In this study, we show that the expression of p21-activated kinase (Pak)1, a serine/threonine protein kinase, is activated in mammary glands during pregnancy and lactation. By targeting an ectopic expression of a kinase-dead Pak1 mutant under the control of ovine beta-lactoglobulin promoter, we found that the mammary glands of female mice expressing kinase-dead Pak1 transgene revealed incomplete lobuloalveolar development and impaired functional differentiation. The expression of whey acidic protein and beta-casein and the amount of activated Stat5 in the nuclei of epithelial cells in transgenic mice were drastically reduced. Further analysis of the underlying mechanisms revealed that Pak1 stimulated beta-casein promoter activity in normal mouse mammary epithelial cells and also cooperated with Stat5a. Pak1 directly interacted with and phosphorylated Stat5a at Ser 779, and both COOH-terminal deletion containing Ser 779 of Stat5a and the Ser 779 to Ala mutation completely prevented the ability of Pak1 to stimulate beta-casein promoter. Mammary glands expressing inactive Pak1 exhibited a reduction of Stat5a Ser 779 phosphorylation. These findings suggest that Pak1 is required for alveolar morphogenesis and lactation function, and thus, identify novel functions of Pak1 in the mammary gland development.
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Affiliation(s)
- Rui-An Wang
- Department of Molecular and Cellular Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA
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23
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Sohn EJ, Kim ES, Zhao M, Kim SJ, Kim H, Kim YW, Lee YJ, Hillmer S, Sohn U, Jiang L, Hwang I. Rha1, an Arabidopsis Rab5 homolog, plays a critical role in the vacuolar trafficking of soluble cargo proteins. THE PLANT CELL 2003; 15:1057-70. [PMID: 12724533 PMCID: PMC153716 DOI: 10.1105/tpc.009779] [Citation(s) in RCA: 161] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Rab proteins are members of the Ras superfamily of small GTP binding proteins and play important roles in various intracellular trafficking steps. We investigated the role of Rha1, an Arabidopsis Rab5 homolog, in intracellular trafficking in Arabidopsis protoplasts. In the presence of a dominant-negative mutant of Rha1, soluble vacuolar cargo proteins such as sporamin:green fluorescent protein (Spo:GFP) and Arabidopsis aleurain like protein:GFP are not delivered to the central vacuole; instead, they accumulate as a diffuse or punctate staining pattern within the cell. Spo:GFP at the punctate stains observed in the presence of hemagglutinin:Rha1[S24N] is colocalized with endogenous vacuolar sorting receptor (VSR(At-1)), which is known to localize primarily to the prevacuolar compartment, whereas Spo:GFP in the diffuse pattern is associated with tonoplasts. Furthermore, expression of Rha1[S24N] causes the secretion of a portion of the vacuolar proteins into medium. However, the inhibitory effect of Rha1[S24N] on vacuolar trafficking is relieved partially by coexpressed wild-type Rha1. Based on these results, we propose that Rha1 plays a critical role in the trafficking of soluble cargoes from the prevacuolar compartment to the central vacuole.
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Affiliation(s)
- Eun Ju Sohn
- Center for Plant Intracellular Trafficking, Pohang University of Science and Technology, Korea
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24
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Li F, Mandal M, Mishra SK, Barnes CJ, Kumar R. Heregulin promotes expression and subcellular redistribution of ADP-ribosylation factor 3. FEBS Lett 2002; 524:49-53. [PMID: 12135740 DOI: 10.1016/s0014-5793(02)02994-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
To identify genes whose expression is modulated by heregulin-beta1 (HRG), a regulatory polypeptide for mammary epithelial cells, we performed differential display screening of MCF-7 cell mRNA. One cDNA clone upregulated by HRG was identical to human ADP-ribosylation factor 3 (ARF3), a guanine nucleotide-binding protein functioning in vesicular trafficking, phospholipase D activation and intracellular transport. HRG treatment increased expression of ARF3 mRNA and protein. Also, HRG triggered a rapid redistribution of ARF3, first to cell membranes and then to the nuclear compartment, where ARF3 colocalized with acetylated histone H3 in discrete regions. In addition, the ARF3 protein was developmentally regulated in the mammary gland with the highest levels in virgin and post-weaning glands. Together, these findings suggest for the first time that stimulation of ARF3 expression, subcellular redistribution and interaction with acetylated histone H3 may play a role in the action of HRG in mammary epithelial cells.
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Affiliation(s)
- Feng Li
- Department of Molecular and Cellular Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA
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25
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Talukder AH, Wang RA, Kumar R. Expression and transactivating functions of the bZIP transcription factor GADD153 in mammary epithelial cells. Oncogene 2002; 21:4289-300. [PMID: 12082616 DOI: 10.1038/sj.onc.1205529] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2001] [Revised: 03/11/2002] [Accepted: 03/26/2002] [Indexed: 01/03/2023]
Abstract
Heregulin-beta1 (HRG), a combinatorial ligand for human epidermal growth factor receptor 3 (HER3) and HER4, is a regulatory polypeptide having distinct biological effects, such as growth stimulation, differentiation, invasiveness, and migration in mammary epithelial cells. The mechanism underlying the diverse functions of HRG is not well established but is believed to depend on induced changes in the expression of specific cellular gene products, their modification, or both. Here, we identified the basic leucine zipper transcription factor, the growth-arrest and DNA-damage 153 (GADD153)/CCAAT-enhancer binding protein (C/EBP) homologous protein (CHOP) as one of the HRG-inducible genes. We demonstrated that HRG stimulation of mammary epithelial cells induces the expression of GADD153 mRNA and protein and transcription of GADD153 promoter. The transcriptional activity of the GADD153 promoter as well as transcription from the C/EBP-activating transcription factor (ATF) composite motif in the GADD153 promoter was also stimulated by HRG-inducible ATF-4 and activated HER2 but not wild-type HER2. GADD153 expression was upregulated by the lactogenic hormones insulin and progesterone and associated with differentiation of normal mammary epithelial cells. Consistent with its role as transcriptional modifier, GADD153 stimulated transcription of beta-casein promoter activity in a STAT5a-sensitive manner in mammary epithelial cells. Analysis of mouse mammary gland development revealed that GADD153 expression was predominantly restricted in the early lactating stages. Because cyclic AMP responsive element and ATF binding sites are present in a variety of growth-regulating cellular genes, these findings suggest that stimulation of GADD153 expression and its transactivating functions may constitute an important mechanism of regulation of putative genes having diverse functions during cell growth and differentiation.
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MESH Headings
- Activating Transcription Factor 4
- Adenocarcinoma/pathology
- Animals
- Antibodies, Monoclonal/pharmacology
- Antibodies, Monoclonal, Humanized
- Breast/cytology
- Breast/metabolism
- Breast Neoplasms/pathology
- CCAAT-Enhancer-Binding Proteins/biosynthesis
- CCAAT-Enhancer-Binding Proteins/genetics
- CCAAT-Enhancer-Binding Proteins/physiology
- Caseins/biosynthesis
- Caseins/genetics
- Cell Differentiation/physiology
- Cell Division/physiology
- Cells, Cultured/drug effects
- Cells, Cultured/metabolism
- Cyclic AMP/physiology
- DNA-Binding Proteins/physiology
- Epithelial Cells/cytology
- Epithelial Cells/metabolism
- Female
- Gene Expression Regulation/drug effects
- Gene Expression Regulation/physiology
- Genes, erbB-2
- Humans
- In Situ Hybridization
- Insulin/pharmacology
- Lactation/genetics
- Mammary Glands, Animal/cytology
- Mammary Glands, Animal/growth & development
- Mammary Glands, Animal/metabolism
- Mice
- Milk Proteins
- Neuregulin-1/physiology
- Progesterone/pharmacology
- Promoter Regions, Genetic
- Receptor, ErbB-2/physiology
- Reverse Transcriptase Polymerase Chain Reaction
- STAT5 Transcription Factor
- Trans-Activators/physiology
- Transcription Factor CHOP
- Transcription Factors/biosynthesis
- Transcription Factors/genetics
- Transcription Factors/physiology
- Transcription, Genetic/drug effects
- Transcription, Genetic/physiology
- Trastuzumab
- Tumor Cells, Cultured/drug effects
- Tumor Cells, Cultured/metabolism
- Tumor Suppressor Proteins
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Affiliation(s)
- Amjad H Talukder
- Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, TX 77030, USA
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26
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He H, Dai F, Yu L, She X, Zhao Y, Jiang J, Chen X, Zhao S. Identification and characterization of nine novel human small GTPases showing variable expressions in liver cancer tissues. Gene Expr 2002; 10:231-42. [PMID: 12450215 PMCID: PMC5977521 DOI: 10.3727/000000002783992406] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/29/2002] [Indexed: 11/24/2022]
Abstract
Digestion and detoxification are the two most important functions of the liver, and liver cells always keep a high metabolism level and active vesicular traffic. The malfunction of the vesicular traffic system might be a cause of the abnormal biological behavior of cancerous liver cells. The Ras superfamily is known to regulate various steps of vesicular traffic in eukaryotic cells. It would be significant to determine the change of vesicular transport molecules such as the members of Ras superfamily in carcinogenesis of liver cells. In the present study, we have cloned nine novel genes encoding human small GTPases: RAB1B, RAB4B, RAB10, RAB22A, RAB24, RAB25 ARL5, SARA1, and SARA2, among which the former six belong to the RAB family and the latter three belong to the ARF/SAR1 family. The identification of these new genes has greatly enlarged the pool of the Ras superfamily. It is interesting to find that they are upregulated in most of the 11 hepatocellular carcinoma and 1 cholangiohepatoma cases. Furthermore, the expression in 16 normal human adult tissues, the chromosome loci, and the gene structures of the nine genes are also described. The above findings could be valuable for understanding the vesicular transport system and elucidating the molecular basis of liver cancer carcinogenesis.
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Affiliation(s)
- Hua He
- State Key Laboratory of Genetic Engineering, Group of Liver Cancer Research, Institute of Genetics, School of Life Science, Fudan University, Shanghai 200433, P.R. China
| | - Fangyan Dai
- State Key Laboratory of Genetic Engineering, Group of Liver Cancer Research, Institute of Genetics, School of Life Science, Fudan University, Shanghai 200433, P.R. China
| | - Long Yu
- State Key Laboratory of Genetic Engineering, Group of Liver Cancer Research, Institute of Genetics, School of Life Science, Fudan University, Shanghai 200433, P.R. China
- Address correspondence to Prof. Long Yu, Institute of Genetics, Fudan University, 220 Handan Road, Shanghai 200433, P.R. China. Tel: 86-21-65642422; Fax: 86-21-65643250; E-mail:
| | - Xingyu She
- State Key Laboratory of Genetic Engineering, Group of Liver Cancer Research, Institute of Genetics, School of Life Science, Fudan University, Shanghai 200433, P.R. China
| | - Yong Zhao
- State Key Laboratory of Genetic Engineering, Group of Liver Cancer Research, Institute of Genetics, School of Life Science, Fudan University, Shanghai 200433, P.R. China
| | - Jianmin Jiang
- State Key Laboratory of Genetic Engineering, Group of Liver Cancer Research, Institute of Genetics, School of Life Science, Fudan University, Shanghai 200433, P.R. China
| | - Xiaosong Chen
- State Key Laboratory of Genetic Engineering, Group of Liver Cancer Research, Institute of Genetics, School of Life Science, Fudan University, Shanghai 200433, P.R. China
| | - Shouyuan Zhao
- State Key Laboratory of Genetic Engineering, Group of Liver Cancer Research, Institute of Genetics, School of Life Science, Fudan University, Shanghai 200433, P.R. China
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27
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Li F, Mandal M, Barnes CJ, Vadlamudi RK, Kumar R. Growth factor regulation of the molecular chaperone calnexin. Biochem Biophys Res Commun 2001; 289:725-32. [PMID: 11726208 DOI: 10.1006/bbrc.2001.6001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Heregulin-beta1 (HRG) is a regulatory polypeptide having several distinct biological effects in mammary epithelial cells. To address the hypothesis that HRG selectively regulates gene expression, we performed differential display screening using cells grown in the presence or absence of HRG. One cDNA clone upregulated by HRG was identical to human calnexin, a protein with molecular chaperone function. This is the first demonstration of the regulation of calnexin mRNA and protein expression by a physiologically relevant polypeptide factor in human breast cancer cells. HRG stimulation also caused a rapid redistribution of calnexin from vesicle-like structures in the cell cytoplasm to the perinuclear area and to the cell membrane. Furthermore, HRG induced colocalization and physical interaction of calnexin with the HER2 growth factor receptor. Finally, calnexin protein levels were increased in progressive stages of human breast cancer. These findings suggest that stimulation of calnexin expression by HRG may constitute a mechanism of protein redistribution and facilitate downstream signaling events in growth-factor-activated cells.
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Affiliation(s)
- F Li
- Department of Molecular and Cellular Oncology, University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA
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