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Yamada K, Shioya R, Nishino K, Furihata H, Hijikata A, Kaneko MK, Kato Y, Shirai T, Kosako H, Sawasaki T. Proximity extracellular protein-protein interaction analysis of EGFR using AirID-conjugated fragment of antigen binding. Nat Commun 2023; 14:8301. [PMID: 38097606 PMCID: PMC10721602 DOI: 10.1038/s41467-023-43931-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 11/24/2023] [Indexed: 12/17/2023] Open
Abstract
Receptor proteins, such as epidermal growth factor receptor (EGFR), interact with other proteins in the extracellular region of the cell membrane to drive intracellular signalling. Therefore, analysis of extracellular protein-protein interactions (exPPIs) is important for understanding the biological function of receptor proteins. Here, we present an approach using a proximity biotinylation enzyme (AirID) fusion fragment of antigen binding (FabID) to analyse the proximity exPPIs of EGFR. AirID was C-terminally fused to the Fab fragment against EGFR (EGFR-FabID), which could then biotinylate the extracellular region of EGFR in several cell lines. Liquid Chromatography-Mass Spectrometry (LC-MS/MS) analysis indicated that many known EGFR interactors were identified as proximity exPPIs, along with many unknown candidate interactors, using EGFR-FabID. Interestingly, these proximity exPPIs were influenced by treatment with EGF ligand and its specific kinase inhibitor, gefitinib. These results indicate that FabID provides accurate proximity exPPI analysis of target receptor proteins on cell membranes with ligand and drug responses.
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Affiliation(s)
- Kohdai Yamada
- Division of Cell-Free Life Science, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
| | - Ryouhei Shioya
- Division of Cell-Free Life Science, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
| | - Kohei Nishino
- Division of Cell Signaling, Fujii Memorial Institute of Medical Sciences, Institute of Advanced Medical Sciences, Tokushima University, Tokushima, 770-8503, Japan
| | - Hirotake Furihata
- Division of Cell-Free Life Science, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
| | - Atsushi Hijikata
- Laboratory of Computational Genomics, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, 192-0392, Japan
| | - Mika K Kaneko
- Department of Antibody Drug Development, Tohoku University Graduate School of Medicine, Sendai, 980-8575, Japan
- Department of Molecular Pharmacology, Tohoku University Graduate School of Medicine, Sendai, 980-8575, Japan
| | - Yukinari Kato
- Department of Antibody Drug Development, Tohoku University Graduate School of Medicine, Sendai, 980-8575, Japan
- Department of Molecular Pharmacology, Tohoku University Graduate School of Medicine, Sendai, 980-8575, Japan
| | - Tsuyoshi Shirai
- Department of Bioscience, Nagahama Institute of BioScience and Technology, 1266 Tamura, Nagahama, 526-0829, Japan
| | - Hidetaka Kosako
- Division of Cell Signaling, Fujii Memorial Institute of Medical Sciences, Institute of Advanced Medical Sciences, Tokushima University, Tokushima, 770-8503, Japan.
| | - Tatsuya Sawasaki
- Division of Cell-Free Life Science, Proteo-Science Center, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan.
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Estrogen Receptor Alpha Splice Variants, Post-Translational Modifications, and Their Physiological Functions. Cells 2023; 12:cells12060895. [PMID: 36980236 PMCID: PMC10047206 DOI: 10.3390/cells12060895] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 03/08/2023] [Accepted: 03/11/2023] [Indexed: 03/17/2023] Open
Abstract
The importance of estrogenic signaling for a broad spectrum of biological processes, including reproduction, cancer development, energy metabolism, memory and learning, and so on, has been well documented. Among reported estrogen receptors, estrogen receptor alpha (ERα) has been known to be a major mediator of cellular estrogenic signaling. Accumulating evidence has shown that the regulations of ERα gene transcription, splicing, and expression across the tissues are highly complex. The ERα promoter region is composed of multiple leader exons and 5′-untranslated region (5′-UTR) exons. Differential splicing results in multiple ERα proteins with different molecular weights and functional domains. Furthermore, various post-translational modifications (PTMs) further impact ERα cellular localization, ligand affinity, and therefore functionality. These splicing isoforms and PTMs are differentially expressed in a tissue-specific manner, mediate certain aspects of ERα signaling, and may work even antagonistically against the full-length ERα. The fundamental understanding of the ERα splicing isoforms in normal physiology is limited and association studies of the splicing isoforms and the PTMs are scarce. This review aims to summarize the functional diversity of these ERα variants and the PTMs in normal physiological processes, particularly as studied in transgenic mouse models.
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CF-PPiD technology based on cell-free protein array and proximity biotinylation enzyme for in vitro direct interactome analysis. Sci Rep 2022; 12:10592. [PMID: 35732899 PMCID: PMC9217950 DOI: 10.1038/s41598-022-14872-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 06/14/2022] [Indexed: 12/04/2022] Open
Abstract
Protein–protein interaction (PPI) analysis is a key process to understand protein functions. Recently, we constructed a human protein array (20 K human protein beads array) consisting of 19,712 recombinant human proteins produced by a wheat cell-free protein production system. Here, we developed a cell-free protein array technology for proximity biotinylation-based PPI identification (CF-PPiD). The proximity biotinylation enzyme AirID-fused TP53 and -IκBα proteins each biotinylated specific interacting proteins on a 1536-well magnetic plate. In addition, AirID-fused cereblon was shown to have drug-inducible PPIs using CF-PPiD. Using the human protein beads array with AirID-IκBα, 132 proteins were biotinylated, and then selected clones showed these biological interactions in cells. Although ZBTB9 was not immunoprecipitated, it was highly biotinylated by AirID-IκBα, suggesting that this system detected weak interactions. These results indicated that CF-PPiD is useful for the biochemical identification of directly interacting proteins.
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Ramachandran B, Murhekar K, Sundersingh S. SERMs suppresses the growth of ERα positive cervical cancer xenografts through predominant inhibition of extra-nuclear ERα expression. Am J Cancer Res 2021; 11:3335-3353. [PMID: 34249466 PMCID: PMC8263693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 05/05/2021] [Indexed: 06/13/2023] Open
Abstract
The role of estrogens and estrogen receptors (ER) in cervical cancer (CC) is not well established. However, epidemiological studies and abundant evidence from genetically engineered mouse models support such hypothesis. In this study, we have addressed estrogen responsiveness in a human CC cell line xenograft mouse model. We assessed the sensitivity of Ethynyl Estradiol (EE), SERMs (fulvestrant, MPP) and a non-SERM (EGCG) to competitively modulate the growth of ERα+ve MS751 CC xenografts. We also checked the agonistic-antagonistic propensity of the above treatments to alter the histology of ovariectomised mouse uterine cervix. Chronic EE treatment encouraged the growth of ERα+ve MS751 CC xenografts, while SERMs and EGCG significantly decreased tumor formation. SERMs were found to inhibit ERα expression, localized within cytoplasmic and membrane compartments. Conversely, ERα was not inducible and EE administration suppressed the growth of ERα-ve HeLa CC xenografts. SERMs competitively induced atrophic features to uterine cervix, with MPP giving rise to mucinous metaplasia in the ectocervix. We have demonstrated that, estrogen sensitivity mediated through ERα has promoted CC tumorigenesis. This in turn was modulated by SERMs, predominantly through inhibition of extra-nuclear ERα expression. Though, induction of hyper-estrogenic status in the ectocervix, might underrate the utility of SERMs in ERα+ve CC.
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Affiliation(s)
- Balaji Ramachandran
- Department of Molecular Oncology, Cancer Institute (W.I.A)No. 38, Sardar Patel Road, Adyar, Chennai 600 036, India
| | - Kanchan Murhekar
- Department of Oncopathology, Cancer Institute (W.I.A)No. 38, Sardar Patel Road, Adyar, Chennai 600 036, India
| | - Shirley Sundersingh
- Department of Oncopathology, Cancer Institute (W.I.A)No. 38, Sardar Patel Road, Adyar, Chennai 600 036, India
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Kido K, Yamanaka S, Nakano S, Motani K, Shinohara S, Nozawa A, Kosako H, Ito S, Sawasaki T. AirID, a novel proximity biotinylation enzyme, for analysis of protein-protein interactions. eLife 2020; 9:54983. [PMID: 32391793 PMCID: PMC7302878 DOI: 10.7554/elife.54983] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 05/07/2020] [Indexed: 12/21/2022] Open
Abstract
Proximity biotinylation based on Escherichia coli BirA enzymes such as BioID (BirA*) and TurboID is a key technology for identifying proteins that interact with a target protein in a cell or organism. However, there have been some improvements in the enzymes that are used for that purpose. Here, we demonstrate a novel BirA enzyme, AirID (ancestral BirA for proximity-dependent biotin identification), which was designed de novo using an ancestral enzyme reconstruction algorithm and metagenome data. AirID-fusion proteins such as AirID-p53 or AirID-IκBα indicated biotinylation of MDM2 or RelA, respectively, in vitro and in cells, respectively. AirID-CRBN showed the pomalidomide-dependent biotinylation of IKZF1 and SALL4 in vitro. AirID-CRBN biotinylated the endogenous CUL4 and RBX1 in the CRL4CRBN complex based on the streptavidin pull-down assay. LC-MS/MS analysis of cells that were stably expressing AirID-IκBα showed top-level biotinylation of RelA proteins. These results indicate that AirID is a novel enzyme for analyzing protein–protein interactions. Proteins in a cell need to interact with each other to perform the many tasks required for organisms to thrive. A technique called proximity biotinylation helps scientists to pinpoint the identity of the proteins that partner together. It relies on attaching an enzyme (either BioID or TurboID) to a protein of interest; when a partner protein comes in close contact with this construct, the enzyme can attach a chemical tag called biotin to it. The tagged proteins can then be identified, revealing which molecules interact with the protein of interest. Although BioID and TurboID are useful tools, they have some limitations. Experiments using BioID take more than 16 hours to complete and require high levels of biotin to be added to the cells. TurboID is more active than BioID and is able to label proteins within ten minutes. However, under certain conditions, it is also more likely to be toxic for the cell, or to make mistakes and tag proteins that do not interact with the protein of interest. To address these issues, Kido et al. developed AirID, a new enzyme for proximity biotinylation. Experiments were then conducted to test how well AirID would perform, using proteins of interest whose partners were already known. These confirm that AirID was able to label partner proteins in human cells; compared with TurboID, it was also less likely to mistakenly tag non-partners or to kill the cells, even over long periods. The results by Kido et al. demonstrate that AirID is suitable for proximity biotinylation experiments in cells. Unlike BioID and TurboID, the enzyme may also have the potential to be used for long-lasting experiments in living organisms, since it is less toxic for cells over time.
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Affiliation(s)
- Kohki Kido
- Division of Cell-Free Life Science, Proteo-Science Center, Matsuyama, Japan
| | - Satoshi Yamanaka
- Division of Cell-Free Life Science, Proteo-Science Center, Matsuyama, Japan
| | - Shogo Nakano
- Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan
| | - Kou Motani
- Division of Cell Signaling, Fujii Memorial Institute of Medical Sciences, Tokushima University, Tokushima, Japan
| | - Souta Shinohara
- Division of Cell-Free Life Science, Proteo-Science Center, Matsuyama, Japan
| | - Akira Nozawa
- Division of Cell-Free Life Science, Proteo-Science Center, Matsuyama, Japan
| | - Hidetaka Kosako
- Division of Cell Signaling, Fujii Memorial Institute of Medical Sciences, Tokushima University, Tokushima, Japan
| | - Sohei Ito
- Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan
| | - Tatsuya Sawasaki
- Division of Cell-Free Life Science, Proteo-Science Center, Matsuyama, Japan
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Bao W, Zhang Y, Li S, Fan Q, Qiu M, Wang Y, Li Y, Ji X, Yang Y, Sang Z, Xu W, Yang Y, Wu S, Zhu Y. miR‑107‑5p promotes tumor proliferation and invasion by targeting estrogen receptor‑α in endometrial carcinoma. Oncol Rep 2018; 41:1575-1585. [PMID: 30569100 PMCID: PMC6365687 DOI: 10.3892/or.2018.6936] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 11/14/2018] [Indexed: 12/23/2022] Open
Abstract
The aberrant expression of miR107-5p is closely related to the development of several types of human cancers. However, the role of miR-107-5p in endometrial carcinoma (EC) has not been fully confirmed. In the present study, we aimed to explore the function of miR-107-5p in EC carcinogenesis. EC samples and normal endometrial tissues were obtained by laser capture microdissection. It was determined that the expression of miR-107-5p in EC was significantly higher than that in normal endometrium, and higher miR-107-5p expression was related to advanced FIGO stages, lymph node metastasis and myometrial invasion in EC patients. Blocking miR-107-5p significantly inhibited cell proliferation, migration and invasion of EC cells in vitro and in vivo. The results of bioinformatic algorithms and luciferase reporter assays revealed that estrogen receptor α (ERα) was a direct target of miR-107-5p. miR-107-5p downregulated the expression of ERα mRNA and protein. In conclusion, our results highlighted that miR-107-5p is a novel prognostic factor that targets ERα to promote tumor proliferation and invasion of EC.
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Affiliation(s)
- Wei Bao
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Yan Zhang
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Shuangdi Li
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Qiong Fan
- Department of Obstetrics and Gynecology, International Peace Maternity and Child Health Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200030, P.R. China
| | - Meiting Qiu
- Department of Obstetrics and Gynecology, Shanghai Ninth People's Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Yanan Wang
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Yanli Li
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Xiaoning Ji
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Ye Yang
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Zhenyu Sang
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Wei Xu
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Yongbin Yang
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Sufang Wu
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Yaping Zhu
- Department of Obstetrics and Gynecology, Shanghai General Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
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Hua H, Zhang H, Kong Q, Jiang Y. Mechanisms for estrogen receptor expression in human cancer. Exp Hematol Oncol 2018; 7:24. [PMID: 30250760 PMCID: PMC6148803 DOI: 10.1186/s40164-018-0116-7] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 09/12/2018] [Indexed: 02/06/2023] Open
Abstract
Estrogen is a steroid hormone that has critical roles in reproductive development, bone homeostasis, cardiovascular remodeling and brain functions. However, estrogen also promotes mammary, ovarian and endometrial tumorigenesis. Estrogen antagonists and drugs that reduce estrogen biosynthesis have become highly successful therapeutic agents for breast cancer patients. The effects of estrogen are largely mediated by estrogen receptor (ER) α and ERβ, which are members of the nuclear receptor superfamily of transcription factors. The mechanisms underlying the aberrant expression of ER in breast cancer and other types of human tumors are complex, involving considerable alternative splicing of ERα and ERβ, transcription factors, epigenetic and post-transcriptional regulation of ER expression. Elucidation of mechanisms for ER expression may not only help understand cancer progression and evolution, but also shed light on overcoming endocrine therapy resistance. Herein, we review the complex mechanisms for regulating ER expression in human cancer.
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Affiliation(s)
- Hui Hua
- 1Laboratory of Stem Cell Biology, West China Hospital, Sichuan University, Chengdu, China
| | - Hongying Zhang
- 2Laboratory of Oncogene, West China Hospital, Sichuan University, Chengdu, China
| | - Qingbin Kong
- 2Laboratory of Oncogene, West China Hospital, Sichuan University, Chengdu, China
| | - Yangfu Jiang
- 2Laboratory of Oncogene, West China Hospital, Sichuan University, Chengdu, China
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Moussa RS, Kovacevic Z, Bae DH, Lane DJR, Richardson DR. Transcriptional regulation of the cyclin-dependent kinase inhibitor, p21 CIP1/WAF1, by the chelator, Dp44mT. Biochim Biophys Acta Gen Subj 2017; 1862:761-774. [PMID: 29032246 DOI: 10.1016/j.bbagen.2017.10.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 10/10/2017] [Accepted: 10/11/2017] [Indexed: 01/04/2023]
Abstract
BACKGROUND The cyclin-dependent kinase inhibitor, p21, is well known for its role in cell cycle arrest. Novel anti-cancer agents that deplete iron pools demonstrate marked anti-tumor activity and are also active in regulating p21 expression. These agents induce p21 mRNA levels independently of the tumor suppressor, p53, and differentially regulate p21 protein expression depending on the cell-type. Several chelators, including an analogue of the potent anti-tumor agent, di-2-pyridylketone 4,4-dimethyl-3-thiosemicarbazone (Dp44mT), have entered clinical trials, and thus, their molecular mechanism of action is crucial to assess. Hence, this investigation examined how several iron chelators transcriptionally regulate p21. METHODS Promoter-deletion constructs; luciferase assays; RT-PCR; western analysis; gene silencing; co-immunoprecipitation. RESULTS The transcriptional regulation of the p21 promoter by iron chelators was demonstrated to be dependent on the chelator and cell-type examined. The potent anti-cancer chelator, Dp44mT, induced p21 promoter activity in SK-MEL-28 melanoma cells, but not in MCF-7 breast cancer cells. Further analysis of the p21 promoter identified a 50-bp region between -104 and -56-bp that was required for Dp44mT-induced activation in SK-MEL-28 cells. This region contained several Sp1-binding sites and mutational analysis of this region revealed the Sp1-3-binding site played a significant role in Dp44mT-induced activation of p21. Further, co-immunoprecipitation demonstrated that Dp44mT induced a marked increase in the interactions between Sp1 and the transcription factors, estrogen receptor-α and c-Jun. CONCLUSIONS AND GENERAL SIGNIFICANCE Dp44mT-induced p21 promoter activation via the Sp1-3-binding site and increased Sp1/ER-α and Sp1/c-Jun complex formation in SK-MEL-28 cells, suggesting these complexes were involved in p21 promoter activation.
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Affiliation(s)
- Rayan S Moussa
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Zaklina Kovacevic
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Dong-Hun Bae
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Darius J R Lane
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Des R Richardson
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, New South Wales 2006, Australia.
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17β-estradiol differently affects osteogenic differentiation of mesenchymal stem/stromal cells from adipose tissue and bone marrow. Differentiation 2016; 92:291-297. [PMID: 27087652 DOI: 10.1016/j.diff.2016.04.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 03/14/2016] [Accepted: 04/01/2016] [Indexed: 12/22/2022]
Abstract
Adipose-derived and bone marrow stem/stromal cells (ASCs and BMSCs) have been often compared for their application in regenerative medicine, and several factors sustaining their differentiation and efficacy have been investigated. 17 β-estradiol (E2) has been reported to influence some functions of progenitor cells. Here we studied the effects of 10 and 100nM E2 on ASC and BMSC vitality, proliferation and differentiation towards osteogenic and adipogenic lineages. E2 did not modulate ASC and BMSC vitality and growth rate, while the hormone produced a pro-adipogenic effect on both mesenchymal stem/stromal cells (MSCs). In particular, the synergy between 7-day pre-treatment and 100nM E2 led to the most evident result, increasing lipid vacuoles formation in ASCs and BMSCs of +44% and +82%, respectively. Despite the fact that E2 did not alter collagen deposition of osteo-induced MSCs, we observed a different modulation of ASC and BMSC alkaline phosphatase (ALP) activity. Indeed, this osteogenic marker was always enhanced by 17 β-estradiol in BMSCs, and 7-day pre-treatment with 100nM E2 increased it of about 70%. In contrast, E2 weakened ASC osteogenic potential, reducing their ALP activity of about 20%, with the most evident effect on ASCs isolated from pre-menopausal women (-30%). Finally, we identified an estrogen receptor α (ERα) variant of about 37kDa expressed in both MSCs. Interestingly, adipogenic stimuli drastically reduced its expression, while osteogenic ones mildly increased this isoform in BMSCs only. In conclusion, E2 positively affected the adipogenic process of both MSCs while it favored osteogenic induction in BMSCs only, and both mesenchymal progenitors expressed a novel 37kDa ER-α variant whose expression was modulated during differentiation.
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Tamoxifen resistance: From cell culture experiments towards novel biomarkers. Pathol Res Pract 2015; 211:189-97. [DOI: 10.1016/j.prp.2015.01.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 01/12/2015] [Accepted: 01/13/2015] [Indexed: 12/21/2022]
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Acconcia F, Marino M. The Effects of 17β-estradiol in Cancer are Mediated by Estrogen Receptor Signaling at the Plasma Membrane. Front Physiol 2011; 2:30. [PMID: 21747767 PMCID: PMC3129035 DOI: 10.3389/fphys.2011.00030] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 06/17/2011] [Indexed: 12/16/2022] Open
Abstract
Two different isoforms of the estrogen receptors (i.e., ERα and ERβ) mediate pleiotropic 17β-estradiol (E2)-induced cellular effects. The ERs are principally localized in the nucleus where they act by globally modifying the expression of the E2-target genes. The premise that E2 effects are exclusively mediated through the nuclear localized ERs has been rendered obsolete by research over the last 15 years demonstrating that ERα and ERβ proteins are also localized at the plasma membranes and in other extra-nuclear organelles. The E2 modulation of cancer cell proliferation represents a good example of the impact of membrane-initiated signals on E2 effects. In fact, E2 via ERα elicits rapid signals driving cancer cells to proliferation (e.g., in breast cancer cells), while E2-induced ERβ rapid signaling inhibits proliferation (e.g., in colon cancer cells). In this review we provide with an overview of the complex system of E2-induced signal transduction pathways, their impact on E2-induced cancer cell proliferation, and the participation of E2-induced membrane-initiated signals in tumor environment.
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Affiliation(s)
- Filippo Acconcia
- Cell Physiology Laboratory, Department of Biology, University Roma Tre Rome, Italy
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