1
|
Beamish SB, Frick KM. A Putative Role for Ubiquitin-Proteasome Signaling in Estrogenic Memory Regulation. Front Behav Neurosci 2022; 15:807215. [PMID: 35145382 PMCID: PMC8821141 DOI: 10.3389/fnbeh.2021.807215] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 12/20/2021] [Indexed: 12/31/2022] Open
Abstract
Sex steroid hormones such as 17β-estradiol (E2) are critical neuromodulators of hippocampal synaptic plasticity and hippocampus-dependent memory in both males and females. However, the mechanisms through which E2 regulates memory formation in both sexes remain unclear. Research to date suggests that E2 regulates hippocampus-dependent memory by activating numerous cell-signaling cascades to promote the synthesis of proteins that support structural changes at hippocampal synapses. However, this work has largely overlooked the equally important contributions of protein degradation mediated by the ubiquitin proteasome system (UPS) in remodeling the synapse. Despite being critically implicated in synaptic plasticity and successful formation of long-term memories, it remains unclear whether protein degradation mediated by the UPS is necessary for E2 to exert its beneficial effects on hippocampal plasticity and memory formation. The present article provides an overview of the receptor and signaling mechanisms so far identified as critical for regulating hippocampal E2 and UPS function in males and females, with a particular emphasis on the ways in which these mechanisms overlap to support structural integrity and protein composition of hippocampal synapses. We argue that the high degree of correspondence between E2 and UPS activity warrants additional study to examine the contributions of ubiquitin-mediated protein degradation in regulating the effects of sex steroid hormones on cognition.
Collapse
|
2
|
Progesterone receptor isoform B regulates the Oxtr- Plcl2- Trpc3 pathway to suppress uterine contractility. Proc Natl Acad Sci U S A 2021; 118:2011643118. [PMID: 33707208 DOI: 10.1073/pnas.2011643118] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Uterine contractile dysfunction leads to pregnancy complications such as preterm birth and labor dystocia. In humans, it is hypothesized that progesterone receptor isoform PGR-B promotes a relaxed state of the myometrium, and PGR-A facilitates uterine contraction. This hypothesis was tested in vivo using transgenic mouse models that overexpress PGR-A or PGR-B in smooth muscle cells. Elevated PGR-B abundance results in a marked increase in gestational length compared to control mice (21.1 versus 19.1 d respectively, P < 0.05). In both ex vivo and in vivo experiments, PGR-B overexpression leads to prolonged labor, a significant decrease in uterine contractility, and a high incidence of labor dystocia. Conversely, PGR-A overexpression leads to an increase in uterine contractility without a change in gestational length. Uterine RNA sequencing at midpregnancy identified 1,174 isoform-specific downstream targets and 424 genes that are commonly regulated by both PGR isoforms. Gene signature analyses further reveal PGR-B for muscle relaxation and PGR-A being proinflammatory. Elevated PGR-B abundance reduces Oxtr and Trpc3 and increases Plcl2 expression, which manifests a genetic profile of compromised oxytocin signaling. Functionally, both endogenous PLCL2 and its paralog PLCL1 can attenuate uterine muscle cell contraction in a CRISPRa-based assay system. These findings provide in vivo support that PGR isoform levels determine distinct transcriptomic landscapes and pathways in myometrial function and labor, which may help further the understanding of abnormal uterine function in the clinical setting.
Collapse
|
3
|
Daubriac J, Pandya UM, Huang KT, Pavlides SC, Gama P, Blank SV, Shukla P, Crawford SE, Gold LI. Hormonal and Growth Regulation of Epithelial and Stromal Cells From the Normal and Malignant Endometrium by Pigment Epithelium-Derived Factor. Endocrinology 2017; 158:2754-2773. [PMID: 28911166 DOI: 10.1210/en.2017-00028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 06/16/2017] [Indexed: 12/19/2022]
Abstract
We discovered that pigment epithelium-derived factor (PEDF)-null mice have endometrial hyperplasia, the precursor to human type I endometrial cancer (ECA), which is etiologically linked to unopposed estrogen (E2), suggesting that this potent antiangiogenic factor might contribute to dysregulated growth and the development of type I ECA. Treatment of both ECA cell lines and primary ECA cells with recombinant PEDF dose dependently decreased cellular proliferation via an autocrine mechanism by blocking cells in G1 and G2 phases of the cell cycle. Consistent with the known opposing effects of E2 and progesterone (Pg) on endometrial proliferation, Pg increases PEDF protein synthesis and release, whereas E2 has the converse effect. Using PEDF luciferase promoter constructs containing two Pg and one E2 response elements, E2 reduced and Pg increased promoter activity due to distal response elements. Furthermore, E2 decreases and Pg increases PEDF secretion into conditioned media (CM) by both normal endometrial stromal fibroblasts (ESFs) and cancer-associated fibroblasts (CAFs), but only CM from ESFs mediated growth-inhibitory activity of primary endometrial epithelial cells (EECs). In addition, in cocultures with primary EECs, Pg-induced growth inhibition is mediated by ESFs, but not CAFs. This is consistent with reduced levels of Pg receptors on CAFs surrounding human malignant glands in vivo. Taken together, the data suggest that PEDF is a hormone-regulated negative autocrine mediator of endometrial proliferation, and that paracrine growth inhibition by soluble factors, possibly PEDF, released by ESFs in response to Pg, but not CAFs, exemplifies a tumor microenvironment that contributes to the pathogenesis of ECA.
Collapse
Affiliation(s)
- Julien Daubriac
- Department of Medicine, Division of Translational Medicine, New York University School of Medicine Langone Medical Center, New York, New York 10016
| | - Unnati M Pandya
- Department of Medicine, Division of Translational Medicine, New York University School of Medicine Langone Medical Center, New York, New York 10016
| | - Kuang-Tzu Huang
- Department of Medicine, Division of Translational Medicine, New York University School of Medicine Langone Medical Center, New York, New York 10016
| | - Savvas C Pavlides
- Department of Medicine, Division of Translational Medicine, New York University School of Medicine Langone Medical Center, New York, New York 10016
| | - Patricia Gama
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of Sao Paolo, Sao Paolo 05508 000, Brazil
| | - Stephanie V Blank
- Department of Pathology, New York University School of Medicine Langone Medical Center, New York, New York 10016
- Department of Gynecological Oncology, New York University School of Medicine Langone Medical Center, New York, New York 10016
- Perlmutter Cancer Center, New York University School of Medicine Langone Medical Center, New York, New York 10016
| | - Pratibha Shukla
- Department of Pathology, New York University School of Medicine Langone Medical Center, New York, New York 10016
| | - Susan E Crawford
- NorthShore University Research Institute, Affiliate of Chicago Pritizker School of Medicine, Evanston, Illinois 60201
| | - Leslie I Gold
- Department of Medicine, Division of Translational Medicine, New York University School of Medicine Langone Medical Center, New York, New York 10016
- Department of Pathology, New York University School of Medicine Langone Medical Center, New York, New York 10016
- Perlmutter Cancer Center, New York University School of Medicine Langone Medical Center, New York, New York 10016
| |
Collapse
|
4
|
Gao Y, Lin P, Lydon JP, Li Q. Conditional abrogation of transforming growth factor-β receptor 1 in PTEN-inactivated endometrium promotes endometrial cancer progression in mice. J Pathol 2017; 243:89-99. [PMID: 28657664 DOI: 10.1002/path.4930] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 05/10/2017] [Accepted: 05/28/2017] [Indexed: 12/16/2022]
Abstract
Although a putative role for transforming growth factor-β (TGFB) signalling in the pathogenesis of human endometrial cancer has long been proposed, the precise function of TGFB signalling in the development and progression of endometrial cancer remains elusive. Depletion of phosphatase and tensin homologue (PTEN) in the mouse uterus causes endometrial cancer. To identify the potential role of TGFB signalling in endometrial cancer, we simultaneously deleted TGFB receptor 1 (Tgfbr1) and Pten in the mouse uterus by using Cre-recombinase driven by the progesterone receptor (termed Ptend/d ;Tgfbr1d/d ). We found that Ptend/d ;Tgfbr1d/d mice developed severe endometrial lesions that progressed more rapidly than those resulting from conditional deletion of Pten alone, suggesting that TGFB signalling synergizes with PTEN to suppress endometrial cancer progression. Remarkably, Ptend/d ;Tgfbr1d/d mice developed distant pulmonary metastases, leading to a significantly reduced lifespan. The development of metastasis and accelerated tumour progression in Ptend/d ;Tgfbr1d/d mice are associated with increased production of proinflammatory chemokines, enhanced cancer cell motility, as shown by myometrial invasion and disruption, and an altered tumour microenvironment characterized by recruitment of tumour-associated macrophages. Thus, conditional deletion of Tgfbr1 in PTEN-inactivated endometrium leads to a disease that recapitulates invasive and lethal human endometrial cancer. This mouse model may be valuable for preclinical testing of new cancer therapies, particularly those targeting metastasis, one of the hallmarks of cancer and a major cause of death in endometrial cancer patients. Copyright © 2017 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- Yang Gao
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, TX, USA
| | - Pengfei Lin
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, TX, USA.,Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, PR China
| | - John P Lydon
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - Qinglei Li
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, TX, USA
| |
Collapse
|
5
|
Pavlides SC, Lecanda J, Daubriac J, Pandya UM, Gama P, Blank S, Mittal K, Shukla P, Gold LI. TGF-β activates APC through Cdh1 binding for Cks1 and Skp2 proteasomal destruction stabilizing p27kip1 for normal endometrial growth. Cell Cycle 2017; 15:931-47. [PMID: 26963853 DOI: 10.1080/15384101.2016.1150393] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
We previously reported that aberrant TGF-β/Smad2/3 signaling in endometrial cancer (ECA) leads to continuous ubiquitylation of p27(kip1)(p27) by the E3 ligase SCF-Skp2/Cks1 causing its degradation, as a putative mechanism involved in the pathogenesis of this cancer. In contrast, normal intact TGF-β signaling prevents degradation of nuclear p27 by SCF-Skp2/Cks1 thereby accumulating p27 to block Cdk2 for growth arrest. Here we show that in ECA cell lines and normal primary endometrial epithelial cells, TGF-β increases Cdh1 and its binding to APC/C to form the E3 ligase complex that ubiquitylates Cks1 and Skp2 prompting their proteasomal degradation and thus, leaving p27 intact. Knocking-down Cdh1 in ECA cell lines increased Skp2/Cks1 E3 ligase activity, completely diminished nuclear and cytoplasmic p27, and obviated TGF-β-mediated inhibition of proliferation. Protein synthesis was not required for TGF-β-induced increase in nuclear p27 and decrease in Cks1 and Skp2. Moreover, half-lives of Cks1 and Skp2 were extended in the Cdh1-depleted cells. These results suggest that the levels of p27, Skp2 and Cks1 are strongly or solely regulated by proteasomal degradation. Finally, an inverse relationship of low p27 and high Cks1 in the nucleus was shown in patients in normal proliferative endometrium and grade I-III ECAs whereas differentiated secretory endometrium showed the reverse. These studies implicate Cdh1 as the master regulator of TGF-β-induced preservation of p27 tumor suppressor activity. Thus, Cdh1 is a potential therapeutic target for ECA and other human cancers showing an inverse relationship between Cks1/Skp2 and p27 and/or dysregulated TGF-β signaling.
Collapse
Affiliation(s)
- Savvas C Pavlides
- a Department of Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA.,b Divisions of Translational Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA
| | - Jon Lecanda
- a Department of Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA.,b Divisions of Translational Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA
| | - Julien Daubriac
- a Department of Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA.,b Divisions of Translational Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA
| | - Unnati M Pandya
- a Department of Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA.,b Divisions of Translational Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA
| | - Patricia Gama
- c Department of Cell and Developmental Biology , Institute of Biomedical Sciences, University of Sao Paolo , Brazil
| | - Stephanie Blank
- a Department of Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA.,d Gynecologic Oncology, New York University School of Medicine Langone Medical Center , New York , NY , USA.,e Perlmutter Cancer Center at NYU, New York University School of Medicine Langone Medical Center , New York , NY , USA
| | - Khushbakhat Mittal
- d Gynecologic Oncology, New York University School of Medicine Langone Medical Center , New York , NY , USA.,e Perlmutter Cancer Center at NYU, New York University School of Medicine Langone Medical Center , New York , NY , USA
| | - Pratibha Shukla
- a Department of Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA.,d Gynecologic Oncology, New York University School of Medicine Langone Medical Center , New York , NY , USA.,e Perlmutter Cancer Center at NYU, New York University School of Medicine Langone Medical Center , New York , NY , USA
| | - Leslie I Gold
- a Department of Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA.,b Divisions of Translational Medicine , New York University School of Medicine Langone Medical Center , New York , NY , USA.,e Perlmutter Cancer Center at NYU, New York University School of Medicine Langone Medical Center , New York , NY , USA.,f Department of Pathology , New York University School of Medicine Langone Medical Center , New York , NY , USA
| |
Collapse
|
6
|
Yang Y, Zhou JY, Zhao LJ, Gao BR, Wan XP, Wang JL. Dual-specificity Phosphatase 1 Deficiency Induces Endometrioid Adenocarcinoma Progression via Activation of Mitogen-activated Protein Kinase/Extracellular Signal-regulated Kinase Pathway. Chin Med J (Engl) 2017; 129:1154-60. [PMID: 27174322 PMCID: PMC4878159 DOI: 10.4103/0366-6999.181954] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Background: Previously, we reported that dual-specificity phosphatase 1 (DUSP1) was differentially expressed in endometrioid adenocarcinoma (EEA). However, the role of DUSP1 in EEA progression and the relationship between DUSP1 and medroxyprogesterone (MPA) are still unclear. Methods: The expression of DUSP1 in EEA specimens was detected by immunohistochemical analysis. The effect of DUSP1 on cell proliferation was analyzed by Cell Counting Kit 8 and colony formation assay, and cell migration was analyzed by transwell assay. MPA-induced DUSP1 expression in EEA cells was measured by Western blot. Results: DUSP1 expression was deficient in advanced International Federation of Gynecology and Obstetrics stage, high-grade and myometrial invasive EEA. In EEA cell lines (Hec1A, Hec1B, RL952, and Ishikawa), the DUSP1 expression was substantially higher in Ishikawa cells than in other cell lines (P < 0.05). Knockdown of DUSP1 promoted Ishikawa cells proliferation, migration, and activation of mitogen-activated protein kinases/extracellular signal-regulated kinase (MAPK/Erk) pathway. MPA-induced DUSP1 expression and inhibited MAPK/Erk pathway in Ishikawa cells. Conclusions: Our data suggest that DUSP1 deficiency promotes EEA progression via MAPK/Erk pathway, which may be reversed by MPA, suggesting that DUSP1 may serve as a potential therapeutic target for the treatment of EEA.
Collapse
Affiliation(s)
- Yuan Yang
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing 100044, China
| | - Jing-Yi Zhou
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing 100044, China
| | - Li-Jun Zhao
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing 100044, China
| | - Bao-Rong Gao
- Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Xiao-Ping Wan
- Department of Gynecology, Tongji University School of Medicine Affiliated Shanghai First Maternity and Infant Hospital, Shanghai 200126, China
| | - Jian-Liu Wang
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing 100044, China
| |
Collapse
|
7
|
Kubyshkin AV, Aliev LL, Fomochkina II, Kovalenko YP, Litvinova SV, Filonenko TG, Lomakin NV, Kubyshkin VA, Karapetian OV. Endometrial hyperplasia-related inflammation: its role in the development and progression of endometrial hyperplasia. Inflamm Res 2016; 65:785-94. [PMID: 27312112 DOI: 10.1007/s00011-016-0960-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2016] [Revised: 06/06/2016] [Accepted: 06/10/2016] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Endometrial hyperplasia (EH) is one of the most common gynecologic diseases in the world. Different statistical categories implicate an imbalance of estrogens and progestogens in the etiology of this disease. We propose that inflammation also plays a key role in the progression of endometrial hyperplasia. OBJECTIVE The aim of this study is to evaluate the role of inflammation in the transformation and progression of endometrial hyperplasia, using local inflammatory cytokines and nonspecific protease levels, CD 45(+) expression, and histological examination. DESIGN The study included 107 patients (ages 29-49 years) with different forms of endometrial hyperplasia. The enrolled patients were randomized into one of the four groups: normal endometrium (n = 18) as the control group, simple hyperplasia (n = 41), complex hyperplasia without atypia (n = 36), complex atypical hyperplasia or endometrioid adenocarcinoma (n = 12). METHODS The following were evaluated for patients with different forms of EH: steroid hormone levels in blood serum and uterine flushings, immunohistochemical estrogen and progesterone receptor expression patterns in the endometrial tissue, CD 45(+) (common leukocyte antigen) expression, the levels of the cytokines IL-1β, IL-6, and TNF-α, and nonspecific proteases and their inhibitors. RESULTS The level of estradiol in blood serum and especially in uterine flushings was elevated dramatically in simple EH as compared to that of controls, but there was no significant difference between estradiol levels among the different forms of EH. The estimation of CD 45(+), the levels of the cytokines IL-1β, IL-6, and TNF-α, and the activity of proteases (elastase-like and trypsin-like activities) and their inhibitors showed that levels of nonspecific inflammatory markers increase with EH progression. CONCLUSIONS We suggest that the initial responsibility for the development of simple endometrial hyperplasia belongs to systemic hyperestrogenemia and, in particular, local hyperestrogenia, but that the role of inflammatory processes increases in complex and atypical EH. Development of inflammatory changes in endometrial hyperplasia may be considered as a factor in the promotion and progression of pathology, as well as an attributed risk factor for malignancy in endometrial hyperplasia. In this study, we have established a role for CD 45(+) expression cells, non-specific proteases, and the inflammatory cytokines IL-1β, IL-6, and TNF-α in endometrial hyperplasia-related inflammation.
Collapse
Affiliation(s)
- A V Kubyshkin
- Department of General and Clinical Pathophysiology, Medical Academy named after S.I. Georgievskiy of the V.I. Vernadsky Crimean Federal University, Lenin Blvd, 5/7, Simferopol, 295006, Russia, Republic of Crimea.
| | - L L Aliev
- Department of General and Clinical Pathophysiology, Medical Academy named after S.I. Georgievskiy of the V.I. Vernadsky Crimean Federal University, Lenin Blvd, 5/7, Simferopol, 295006, Russia, Republic of Crimea
| | - I I Fomochkina
- Department of General and Clinical Pathophysiology, Medical Academy named after S.I. Georgievskiy of the V.I. Vernadsky Crimean Federal University, Lenin Blvd, 5/7, Simferopol, 295006, Russia, Republic of Crimea
| | - Ye P Kovalenko
- Department of Obstetrics, Gynecology and Perinatology, Medical Academy named after S.I. Georgievskiy of the V.I. Vernadsky Crimean Federal University, Simferopol, Russia, Republic of Crimea
| | - S V Litvinova
- Department of General and Clinical Pathophysiology, Medical Academy named after S.I. Georgievskiy of the V.I. Vernadsky Crimean Federal University, Lenin Blvd, 5/7, Simferopol, 295006, Russia, Republic of Crimea
| | - T G Filonenko
- Department of Pathological Anatomy, Medical Academy named after S.I. Georgievskiy of the V.I. Vernadsky Crimean Federal University, Simferopol, Russia, Republic of Crimea
| | - N V Lomakin
- Central Clinical Hospital of the Presidential Department of RF, Moscow, Russia
| | - V A Kubyshkin
- Department of Radiodiagnostics and Radiotherapy, Medical Academy named after S.I. Georgievskiy of the V.I. Vernadsky Crimean Federal University, Simferopol, Russia, Republic of Crimea
| | - O V Karapetian
- Department of Obstetrics, Gynecology and Perinatology, Medical Academy named after S.I. Georgievskiy of the V.I. Vernadsky Crimean Federal University, Simferopol, Russia, Republic of Crimea
| |
Collapse
|
8
|
de Haydu C, Black JD, Schwab CL, English DP, Santin AD. An update on the current pharmacotherapy for endometrial cancer. Expert Opin Pharmacother 2015; 17:489-99. [DOI: 10.1517/14656566.2016.1127351] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
9
|
Lovisa S, Citro S, Sonego M, Dall'Acqua A, Ranzuglia V, Berton S, Colombatti A, Belletti B, Chiocca S, Schiappacassi M, Baldassarre G. SUMOylation regulates p27Kip1 stability and localization in response to TGFβ. J Mol Cell Biol 2015; 8:17-30. [PMID: 26450989 DOI: 10.1093/jmcb/mjv056] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 06/08/2015] [Indexed: 11/13/2022] Open
Abstract
Exposure of normal and tumor-derived cells to TGFβ results in different outcomes, depending on the regulation of key targets. The CDK inhibitor p27(Kip1) is one of these TGFβ targets and is essential for the TGFβ-induced cell cycle arrest. TGFβ treatment inhibits p27(Kip1) degradation and induces its nuclear translocation, through mechanisms that are still unknown. Recent evidences suggest that SUMOylation, a post-translational modification able to modulate the stability and subcellular localization of target proteins, critically modifies members of the TGFβ signaling pathway. Here, we demonstrate that p27(Kip1) is SUMOylated in response to TGFβ treatment. Using different p27(Kip1) point mutants, we identified lysine 134 (K134) as the residue modified by small ubiquitin-like modifier 1 (SUMO1) in response to TGFβ treatment. TGFβ-induced K134 SUMOylation increased protein stability and nuclear localization of both endogenous and exogenously expressed p27(Kip1). We observed that SUMOylation regulated p27(Kip1) binding to CDK2, thereby governing its nuclear proteasomal degradation through the phosphorylation of threonine 187. Importantly, p27(Kip1) SUMOylation was necessary for proper cell cycle exit following TGFβ treatment. These data indicate that SUMOylation is a novel regulatory mechanism that modulates p27(Kip1) function in response to TGFβ stimulation. Given the involvement of TGFβ signaling in cancer cell proliferation and invasion, our data may shed light on an important aspect of this pathway during tumor progression.
Collapse
Affiliation(s)
- Sara Lovisa
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy
| | - Simona Citro
- Department of Experimental Oncology, European Institute of Oncology at the IFOM-IEO Campus, Milan 20139, Italy
| | - Maura Sonego
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy
| | - Alessandra Dall'Acqua
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy
| | - Valentina Ranzuglia
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy
| | - Stefania Berton
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy
| | - Alfonso Colombatti
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy Department of Scienze e Tecnologie Biomediche, MATI Center of Excellence, University of Udine, Udine 33010, Italy
| | - Barbara Belletti
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy
| | - Susanna Chiocca
- Department of Experimental Oncology, European Institute of Oncology at the IFOM-IEO Campus, Milan 20139, Italy
| | - Monica Schiappacassi
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy
| | - Gustavo Baldassarre
- Division of Experimental Oncology 2 Centro di Riferimento Oncologico, National Cancer Institute, Aviano 33081, Italy
| |
Collapse
|
10
|
Nakajima T, Tanimoto Y, Tanaka M, Chambon P, Watanabe H, Iguchi T, Sato T. Neonatal Estrogen Receptor β Is Important in the Permanent Inhibition of Epithelial Cell Proliferation in the Mouse Uterus. Endocrinology 2015; 156:3317-28. [PMID: 26020796 DOI: 10.1210/en.2015-1012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Estrogen receptor α (ERα) plays a pivotal role in the mouse uterine and vaginal epithelial cell proliferation stimulated by estrogen, whereas ERβ inhibits cell proliferation. ERβ mRNA is expressed in neonatal uteri and vaginae; however, its functions in neonatal tissues have not been ascertained. In this study, we investigated the ontogenic mRNA expression and localization of ERβ, and its roles in cell proliferation in neonatal uteri and vaginae of ERβ knockout (βERKO) mice. ERβ mRNA and protein were abundant in the uterine and vaginal epithelia of 2-day-old mice and decreased with age. In uterine and vaginal epithelia of 2-day-old βERKO mice, cell proliferation was greater than that in wild-type animals and in uterine epithelia of 90- and 365-day-old βERKO mice. In addition, p27 protein, known as a cyclin-dependent kinase inhibitor, was decreased in the uteri of 90- and 365-day-old βERKO mice. Inhibition of neonatal ERs by ICI 182780 (an ER antagonist) treatment stimulated cell proliferation and decreased p27 protein in the uterine luminal epithelium of 90-day-old mice but not in the vaginal epithelium. These results suggest that neonatal ERβ is important in the persistent inhibition of epithelial cell proliferation with accumulation of p27 protein in the mouse uterus. Thus, suppression of ERβ function in the uterine epithelium during the neonatal period may be responsible for a risk for proliferative disease in adults.
Collapse
Affiliation(s)
- Tadaaki Nakajima
- Graduate School of Nanobioscience (T.N., Y.T., T.S.), Yokohama City University, Yokohama 236-0027, Japan; Department of Biological Science and Technology (T.N.), Tokyo University of Science, Tokyo 125-8585, Japan; Department of Food and Nutrition (M.T.), Junior College of Aizu, Aizu 965-8570, Japan; Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur (P.C.), Collège de France, 67404 Illkirch, France; Graduate School of Engineering (H.W.), Osaka University, Suita 565-0871, Japan; and Okazaki Institute for Integrative Bioscience (T.I.), National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki 444-8787, Japan
| | - Yuki Tanimoto
- Graduate School of Nanobioscience (T.N., Y.T., T.S.), Yokohama City University, Yokohama 236-0027, Japan; Department of Biological Science and Technology (T.N.), Tokyo University of Science, Tokyo 125-8585, Japan; Department of Food and Nutrition (M.T.), Junior College of Aizu, Aizu 965-8570, Japan; Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur (P.C.), Collège de France, 67404 Illkirch, France; Graduate School of Engineering (H.W.), Osaka University, Suita 565-0871, Japan; and Okazaki Institute for Integrative Bioscience (T.I.), National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki 444-8787, Japan
| | - Masami Tanaka
- Graduate School of Nanobioscience (T.N., Y.T., T.S.), Yokohama City University, Yokohama 236-0027, Japan; Department of Biological Science and Technology (T.N.), Tokyo University of Science, Tokyo 125-8585, Japan; Department of Food and Nutrition (M.T.), Junior College of Aizu, Aizu 965-8570, Japan; Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur (P.C.), Collège de France, 67404 Illkirch, France; Graduate School of Engineering (H.W.), Osaka University, Suita 565-0871, Japan; and Okazaki Institute for Integrative Bioscience (T.I.), National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki 444-8787, Japan
| | - Pierre Chambon
- Graduate School of Nanobioscience (T.N., Y.T., T.S.), Yokohama City University, Yokohama 236-0027, Japan; Department of Biological Science and Technology (T.N.), Tokyo University of Science, Tokyo 125-8585, Japan; Department of Food and Nutrition (M.T.), Junior College of Aizu, Aizu 965-8570, Japan; Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur (P.C.), Collège de France, 67404 Illkirch, France; Graduate School of Engineering (H.W.), Osaka University, Suita 565-0871, Japan; and Okazaki Institute for Integrative Bioscience (T.I.), National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki 444-8787, Japan
| | - Hajime Watanabe
- Graduate School of Nanobioscience (T.N., Y.T., T.S.), Yokohama City University, Yokohama 236-0027, Japan; Department of Biological Science and Technology (T.N.), Tokyo University of Science, Tokyo 125-8585, Japan; Department of Food and Nutrition (M.T.), Junior College of Aizu, Aizu 965-8570, Japan; Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur (P.C.), Collège de France, 67404 Illkirch, France; Graduate School of Engineering (H.W.), Osaka University, Suita 565-0871, Japan; and Okazaki Institute for Integrative Bioscience (T.I.), National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki 444-8787, Japan
| | - Taisen Iguchi
- Graduate School of Nanobioscience (T.N., Y.T., T.S.), Yokohama City University, Yokohama 236-0027, Japan; Department of Biological Science and Technology (T.N.), Tokyo University of Science, Tokyo 125-8585, Japan; Department of Food and Nutrition (M.T.), Junior College of Aizu, Aizu 965-8570, Japan; Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur (P.C.), Collège de France, 67404 Illkirch, France; Graduate School of Engineering (H.W.), Osaka University, Suita 565-0871, Japan; and Okazaki Institute for Integrative Bioscience (T.I.), National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki 444-8787, Japan
| | - Tomomi Sato
- Graduate School of Nanobioscience (T.N., Y.T., T.S.), Yokohama City University, Yokohama 236-0027, Japan; Department of Biological Science and Technology (T.N.), Tokyo University of Science, Tokyo 125-8585, Japan; Department of Food and Nutrition (M.T.), Junior College of Aizu, Aizu 965-8570, Japan; Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur (P.C.), Collège de France, 67404 Illkirch, France; Graduate School of Engineering (H.W.), Osaka University, Suita 565-0871, Japan; and Okazaki Institute for Integrative Bioscience (T.I.), National Institute for Basic Biology, National Institutes of Natural Sciences, Okazaki 444-8787, Japan
| |
Collapse
|
11
|
Helzer KT, Hooper C, Miyamoto S, Alarid ET. Ubiquitylation of nuclear receptors: new linkages and therapeutic implications. J Mol Endocrinol 2015; 54:R151-67. [PMID: 25943391 PMCID: PMC4457637 DOI: 10.1530/jme-14-0308] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/05/2015] [Indexed: 12/25/2022]
Abstract
The nuclear receptor (NR) superfamily is a group of transcriptional regulators that control multiple aspects of both physiology and pathology and are broadly recognized as viable therapeutic targets. While receptor-modulating drugs have been successful in many cases, the discovery of new drug targets is still an active area of research, because resistance to NR-targeting therapies remains a significant clinical challenge. Many successful targeted therapies have harnessed the control of receptor activity by targeting events within the NR signaling pathway. In this review, we explore the role of NR ubiquitylation and discuss how the expanding roles of ubiquitin could be leveraged to identify additional entry points to control receptor function for future therapeutic development.
Collapse
Affiliation(s)
- Kyle T Helzer
- McArdle Laboratory for Cancer ResearchDepartment of Oncology, 6151 Wisconsin Institutes for Medical Research, University of Wisconsin Carbone Cancer Center, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, Wisconsin 53705, USA
| | - Christopher Hooper
- McArdle Laboratory for Cancer ResearchDepartment of Oncology, 6151 Wisconsin Institutes for Medical Research, University of Wisconsin Carbone Cancer Center, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, Wisconsin 53705, USA
| | - Shigeki Miyamoto
- McArdle Laboratory for Cancer ResearchDepartment of Oncology, 6151 Wisconsin Institutes for Medical Research, University of Wisconsin Carbone Cancer Center, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, Wisconsin 53705, USA
| | - Elaine T Alarid
- McArdle Laboratory for Cancer ResearchDepartment of Oncology, 6151 Wisconsin Institutes for Medical Research, University of Wisconsin Carbone Cancer Center, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, Wisconsin 53705, USA
| |
Collapse
|
12
|
Li Q. Transforming growth factor β signaling in uterine development and function. J Anim Sci Biotechnol 2014; 5:52. [PMID: 25478164 PMCID: PMC4255921 DOI: 10.1186/2049-1891-5-52] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 10/28/2014] [Indexed: 12/16/2022] Open
Abstract
Transforming growth factor β (TGFβ) superfamily is evolutionarily conserved and plays fundamental roles in cell growth and differentiation. Mounting evidence supports its important role in female reproduction and development. TGFBs1-3 are founding members of this growth factor family, however, the in vivo function of TGFβ signaling in the uterus remains poorly defined. By drawing on mouse and human studies as a main source, this review focuses on the recent progress on understanding TGFβ signaling in the uterus. The review also considers the involvement of dysregulated TGFβ signaling in pathological conditions that cause pregnancy loss and fertility problems in women.
Collapse
Affiliation(s)
- Qinglei Li
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843 USA
| |
Collapse
|
13
|
Fiore APZP, Osaki LH, Gama P. Transforming growth factor β1 increases p27 levels via synthesis and degradation mechanisms in the hyperproliferative gastric epithelium in rats. PLoS One 2014; 9:e101965. [PMID: 25000203 PMCID: PMC4085006 DOI: 10.1371/journal.pone.0101965] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 06/13/2014] [Indexed: 12/31/2022] Open
Abstract
Throughout postnatal development, the gastric epithelium expresses Transforming Growth Factor beta1 (TGFβ1), but it is also exposed to luminal peptides that are part of milk. During suckling period, fasting promotes the withdrawal of milk-born molecules while it stimulates gastric epithelial cell proliferation. Such response can be reversed by exogenous TGFβ1, as it directly affects cell cycle through the regulation of p27 levels. We used fasting condition to induce the hyperproliferation of gastric epithelial cells in 14-day-old Wistar rats, and evaluated the effects of TGFβ1 gavage on p27 expression, phosphorylation at threonine 187 (phospho-p27Thr187) and degradation. p27 protein level was reduced during fasting when compared to suckling counterparts, while phospho-p27Thr187/p27 ratio was increased. TGFβ1 gavage reversed this response, which was confirmed through immunostaining. By using a neutralizing antibody against TGFβ1, we found that it restored the p27 and phosphorylation levels detected during fasting, indicating the specific role of the growth factor. We noted that neither fasting nor TGFβ1 changed p27 expression, but after cycloheximide administration, we observed that protein synthesis was influenced by TGFβ1. Next, we evaluated the capacity of the gastric mucosa to degrade p27 and we recorded a higher concentration of the remaining protein in pups treated with TGFβ1, suggesting augmented stability under this condition. Thus, we showed for the first time that luminal TGFβ1 increased p27 levels in the rat gastric mucosa by up- regulating translation and reducing protein degradation. We concluded that such mechanisms might be used by rapidly proliferating cells to respond to milk-born TGFβ1 and food restriction.
Collapse
Affiliation(s)
- Ana P. Z. P. Fiore
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo, SP Brazil
| | - Luciana H. Osaki
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo, SP Brazil
| | - Patricia Gama
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo, SP Brazil
- * E-mail:
| |
Collapse
|
14
|
Gao Y, Li S, Li Q. Uterine epithelial cell proliferation and endometrial hyperplasia: evidence from a mouse model. Mol Hum Reprod 2014; 20:776-86. [PMID: 24770950 DOI: 10.1093/molehr/gau033] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In the uterus, epithelial cell proliferation changes during the estrous cycle and pregnancy. Uncontrolled epithelial cell proliferation results in implantation failure and/or cancer development. Transforming growth factor-β (TGF-β) signaling is a fundamental regulator of diverse biological processes and is indispensable for multiple reproductive functions. However, the in vivo role of TGF-β signaling in uterine epithelial cells remains poorly defined. We have shown that in the uterus, conditional deletion of the Type 1 receptor for TGF-β (Tgfbr1) using anti-Müllerian hormone receptor type 2 (Amhr2) Cre leads to myometrial defects. Here, we describe enhanced epithelial cell proliferation by immunostaining of Ki67 in the uteri of these mice. The aberration culminated in endometrial hyperplasia in aged females. To exclude the potential influence of ovarian steroid hormones, the proliferative status of uterine epithelial cells was assessed following ovariectomy. Increased uterine epithelial cell proliferation was also revealed in ovariectomized Tgfbr1 Amhr2-Cre conditional knockout mice. We further demonstrated that transcript levels for fibroblast growth factor 10 (Fgf10) were markedly up-regulated in Tgfbr1 Amhr2-Cre conditional knockout uteri. Consistently, treatment of primary uterine stromal cells with TGF-β1 significantly reduced Fgf10 mRNA expression. Thus, our findings suggest a potential involvement of TGFBR1-mediated signaling in the regulation of uterine epithelial cell proliferation, and provide genetic evidence supporting the role of uterine epithelial cell proliferation in the pathogenesis of endometrial hyperplasia.
Collapse
Affiliation(s)
- Yang Gao
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Shu Li
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Qinglei Li
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA
| |
Collapse
|
15
|
Pavlides SC, Huang KT, Reid DA, Wu L, Blank SV, Mittal K, Guo L, Rothenberg E, Rueda B, Cardozo T, Gold LI. Inhibitors of SCF-Skp2/Cks1 E3 ligase block estrogen-induced growth stimulation and degradation of nuclear p27kip1: therapeutic potential for endometrial cancer. Endocrinology 2013; 154:4030-45. [PMID: 24035998 PMCID: PMC3800755 DOI: 10.1210/en.2013-1757] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In many human cancers, the tumor suppressor, p27(kip1) (p27), a cyclin-dependent kinase inhibitor critical to cell cycle arrest, undergoes perpetual ubiquitin-mediated proteasomal degradation by the E3 ligase complex SCF-Skp2/Cks1 and/or cytoplasmic mislocalization. Lack of nuclear p27 causes aberrant cell cycle progression, and cytoplasmic p27 mediates cell migration/metastasis. We previously showed that mitogenic 17-β-estradiol (E2) induces degradation of p27 by the E3 ligase Skp1-Cullin1-F-Box- S phase kinase-associated protein2/cyclin dependent kinase regulatory subunit 1 in primary endometrial epithelial cells and endometrial carcinoma (ECA) cell lines, suggesting a pathogenic mechanism for type I ECA, an E2-induced cancer. The current studies show that treatment of endometrial carcinoma cells-1 (ECC-1) with small molecule inhibitors of Skp2/Cks1 E3 ligase activity (Skp2E3LIs) stabilizes p27 in the nucleus, decreases p27 in the cytoplasm, and prevents E2-induced proliferation and degradation of p27 in endometrial carcinoma cells-1 and primary ECA cells. Furthermore, Skp2E3LIs increase p27 half-life by 6 hours, inhibit cell proliferation (IC50, 14.3μM), block retinoblastoma protein (pRB) phosphorylation, induce G1 phase block, and are not cytotoxic. Similarly, using super resolution fluorescence localization microscopy and quantification, Skp2E3LIs increase p27 protein in the nucleus by 1.8-fold. In vivo, injection of Skp2E3LIs significantly increases nuclear p27 and reduces proliferation of endometrial epithelial cells by 42%-62% in ovariectomized E2-primed mice. Skp2E3LIs are specific inhibitors of proteolytic degradation that pharmacologically target the binding interaction between the E3 ligase, SCF-Skp2/Cks1, and p27 to stabilize nuclear p27 and prevent cell cycle progression. These targeted inhibitors have the potential to be an important therapeutic advance over general proteasome inhibitors for cancers characterized by SCF-Skp2/Cks1-mediated destruction of nuclear p27.
Collapse
Affiliation(s)
- Savvas C Pavlides
- PhD, Department of Medicine, Division of Translational Medicine, 550 First Avenue, NB17E4, New York, NY 10016.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Soufla G, Sifakis S, Porichis F, Spandidos DA. Prognostic value of tgfb1 protein in endometrioid adenocarcinoma. Eur J Clin Invest 2013; 43:79-90. [PMID: 23176363 DOI: 10.1111/eci.12017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND Angiogenesis is a prerequisite for tumour development, progression and metastasis; however, its underlying molecular mechanisms in endometrial carcinoma are poorly understood. DESIGN In this study, the mRNA and protein expression profiles of two key regulators of angiogenesis, vascular endothelial growth factor (VEGF) and transforming growth factor beta-1 (TGFB1), were evaluated by real-time PCR and western blot analysis in 23 endometrial cancer tissue-paired specimens (malignant vs. adjacent normal tissues). We aimed to investigate whether VEGF and TGFB1 serve as markers of the malignant transformation of the endometrium and whether VEGF or TGFB1 expression can constitute a useful prognostic marker of survival in patients with endometrial carcinoma. RESULTS Tissue-pair analysis revealed VEGF transcriptional up-regulation and TGFB1 mRNA down-regulation as the most frequent transcriptional features. VEGF and TGFB1 mRNA were positively correlated (P < 0·001). VEGF protein levels were higher in endometrioid-type tissue pairs (P = 0·047). TGFB1 protein and mRNA levels were negatively correlated (P = 0·042). TGFB1 protein expression was related to survival only in patients with endometrioid adenocarcinoma (P = 0·045). CONCLUSIONS Tissue-pair mRNA and protein analysis reveals VEGF transcriptional up-regulation and TGFB1 down-regulation that are correlated with the malignant transformation of the endometrium, while post-transcriptional mechanisms control VEGF and TGFB1 protein. TGFB1 protein demonstrated a prognostic value only in endometrioid adenocarcinoma.
Collapse
Affiliation(s)
- Giannoula Soufla
- Department of Virology, Medical School, University of Crete, Heraklion, Crete, Greece
| | | | | | | |
Collapse
|
17
|
|
18
|
Estrogen and progesterone regulate p27kip1 levels via the ubiquitin-proteasome system: pathogenic and therapeutic implications for endometrial cancer. PLoS One 2012; 7:e46072. [PMID: 23029392 PMCID: PMC3459846 DOI: 10.1371/journal.pone.0046072] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 08/27/2012] [Indexed: 12/14/2022] Open
Abstract
The levels of proteins that control the cell cycle are regulated by ubiquitin-mediated degradation via the ubiquitin-proteasome system (UPS) by substrate-specific E3 ubiquitin ligases. The cyclin-dependent kinase inhibitor, p27kip1 (p27), that blocks the cell cycle in G1, is ubiquitylated by the E3 ligase SCF-Skp2/Cks1 for degradation by the UPS. In turn, Skp2 and Cks1 are ubiquitylated by the E3 ligase complex APC/Cdh1 for destruction thereby maintaining abundant levels of nuclear p27. We previously showed that perpetual proteasomal degradation of p27 is an early event in Type I endometrial carcinogenesis (ECA), an estrogen (E2)-induced cancer. The present studies demonstrate that E2 stimulates growth of ECA cell lines and normal primary endometrial epithelial cells (EECs) and induces MAPK-ERK1/2-dependent phosphorylation of p27 on Thr187, a prerequisite for p27 ubiquitylation by nuclear SCF-Skp2/Cks1 and subsequent degradation. In addition, E2 decreases the E3 ligase [APC]Cdh1 leaving Skp2 and Cks1 intact to cause p27 degradation. Furthermore, knocking-down Skp2 prevents E2-induced p27 degradation and growth stimulation suggesting that the pathogenesis of E2-induced ECA is dependent on Skp2-mediated degradation of p27. Conversely, progesterone (Pg) as an inhibitor of endometrial proliferation increases nuclear p27 and Cdh1 in primary EECs and ECA cells. Pg, also increases Cdh1 binding to APC to form the active E3ligase. Knocking-down Cdh1 obviates Pg-induced stabilization of p27 and growth inhibition. Notably, neither E2 nor Pg affected transcription of Cdh1, Skp2, Cks1 nor p27. These studies provide new insights into hormone regulation of cell proliferation through the UPS. The data implicates that preventing nuclear p27 degradation by blocking Skp2/Cks1-mediated degradation of p27 or increasing Cdh1 to mediate degradation of Skp2-Cks1 are potential strategies for the prevention and treatment of ECA.
Collapse
|
19
|
Liu F, Gao X, Yu H, Yuan D, Zhang J, He Y, Yue L. The role of progesterone and its receptor on cyclin G1 expression in endometrial carcinoma cells. Reprod Sci 2012; 19:1205-10. [PMID: 22649121 DOI: 10.1177/1933719112446073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Cyclin G1 protein is expressed in normal endometrial epithelial cells in a progesterone-dependent manner. It is an important mediator of the inhibiting effect of progesterone on cell proliferation. Moreover, the expression of cyclin G1 is also found to be decreased in human endometrial carcinoma cells (ECCs). To study the mechanism of decrease in the expression levels of cyclin G1, 3 ECC cell lines, Ishikawa, HEC-1-B, and KLE cells were treated with progesterone (P(4)). The KLE cells, in which progesterone receptor (PR) expression was absent, were transfected with PR-expressing plasmid before treatment with P(4). The results showed that cyclin G1 expression increased in Ishikawa and HEC-1-B cells after treatment with P(4), additionally the cell proliferation was suppressed but not in KLE cells. When the PR-expressing plasmid was transfected into KLE cells, the effect of P(4) was restored. Our data suggest that the deficiency of progesterone and its receptors is an important cause of the decreased expression of cyclin G1 in endometrial carcinoma, which may account for carcinogenesis and development of endometrial carcinomas.
Collapse
Affiliation(s)
- Fang Liu
- Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, China
| | | | | | | | | | | | | |
Collapse
|
20
|
Li GQ, Xie J, Lei XY, Zhang L. Macrophage migration inhibitory factor regulates proliferation of gastric cancer cells via the PI3K/Akt pathway. World J Gastroenterol 2010. [PMID: 19938192 DOI: 10.3748/wjg.15.554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM To investigate the effects of macrophage migration inhibitory factor (MIF) on proliferation of human gastric cancer MGC-803 cells and expression of cyclin D1 and p27(Kip1) in them, and further determine whether the effects are related to the PI3K/Akt signal transduction pathway. METHODS Gastric cancer MGC-803 cells were cultured and then treated with 50 microg/L recombinant human MIF (rhMIF) with and without a PI3K inhibitor, LY294002 (25 micromol/L). MTT assay was used to detect the proliferation of MGC-803 cells. Cell cycle was detected by flow cytometry. Expression of cyclin D1 and p27(Kip1) mRNA was by reverse transcription-polymerase chain reaction. Protein expression of phosphorylated Akt (p-Akt), Akt, cyclin D1 and p27(Kip1) was examined by immunocytochemistry and Western blotting. RESULTS rhMIF significantly stimulated the proliferation of MGC-803 cells and cell cycle progression from G1 phase to S phase in a concentration- and time-dependent manner. After the MGC-803 cells were treated with rhMIF for 24 h, the expression of cyclin D1 was significantly up-regulated compared with the cells not treated with rhMIF at both mRNA and protein levels (0.97 +/- 0.02 vs 0.74 +/- 0.01, P = 0.002; 0.98 +/- 0.05 vs 0.69 +/- 0.04, P = 0.003). The p27(Kip1) was down-regulated but only statistically significant at the protein level. rhMIF significantly increased the expression of p-Akt, which reached the peak at 30 min, but did not affect the expression of Akt. However, LY294002 inhibited all the effects of rhMIF. CONCLUSION Macrophage MIF increases the proliferation of gastric cancer cells, induces the expression of cyclin D1 at the transcriptional level and inhibits the expression of p27(Kip1) at the post-transcriptional level via the PI3K/Akt pathway.
Collapse
Affiliation(s)
- Guo-Qing Li
- Department of Gastroenterology, The Second Affiliated Hospital, University of South China, Hunan Province, China.
| | | | | | | |
Collapse
|
21
|
Haughian JM, Reno EM, Thorne AM, Bradford AP. Protein kinase C alpha-dependent signaling mediates endometrial cancer cell growth and tumorigenesis. Int J Cancer 2009; 125:2556-64. [PMID: 19672862 PMCID: PMC2777752 DOI: 10.1002/ijc.24633] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Endometrial cancer is the most common invasive gynecologic malignancy, yet molecular mechanisms and signaling pathways underlying its etiology and pathophysiology remain poorly characterized. We sought to define a functional role for the protein kinase C (PKC) isoform, PKCalpha, in an established cell model of endometrial adenocarcinoma. Ishikawa cells depleted of PKCalpha protein grew slower, formed fewer colonies in anchorage-independent growth assays and exhibited impaired xenograft tumor formation in nude mice. Consistent with impaired growth, PKCalpha knockdown increased levels of the cyclin-dependent kinase (CDK) inhibitors p21(Cip1/WAF1) (p21) and p27(Kip1) (p27). Despite the absence of functional phosphatase and tensin homolog (PTEN) protein in Ishikawa cells, PKCalpha knockdown reduced Akt phosphorylation at serine 473 and concomitantly inhibited phosphorylation of the Akt target, glycogen synthase kinase-3beta (GSK-3beta). PKCalpha knockdown also resulted in decreased basal ERK phosphorylation and attenuated ERK activation following EGF stimulation. p21 and p27 expression was not increased by treatment of Ishikawa cells with ERK and Akt inhibitors, suggesting that PKCalpha regulates CDK expression independently of Akt and ERK. Immunohistochemical analysis of Grade 1 endometrioid adenocarcinoma revealed aberrant PKCalpha expression, with foci of elevated PKCalpha staining, not observed in normal endometrium. These studies demonstrate a critical role for PKCalpha signaling in endometrial tumorigenesis by regulating expression of CDK inhibitors p21 and p27 and activation of Akt and ERK-dependent proliferative pathways. Thus, targeting PKCalpha may provide novel therapeutic options in endometrial tumors.
Collapse
Affiliation(s)
- James M Haughian
- Department of Obstetrics and Gynecology, Section of Basic Reproductive Sciences, University of Colorado, Denver School of Medicine, Aurora, CO 80045, USA
| | | | | | | |
Collapse
|
22
|
Li GQ, Xie J, Lei XY, Zhang L. Macrophage migration inhibitory factor regulates proliferation of gastric cancer cells via the PI3K/Akt pathway. World J Gastroenterol 2009; 15:5541-8. [PMID: 19938192 PMCID: PMC2785056 DOI: 10.3748/wjg.15.5541] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the effects of macrophage migration inhibitory factor (MIF) on proliferation of human gastric cancer MGC-803 cells and expression of cyclin D1 and p27Kip1 in them, and further determine whether the effects are related to the PI3K/Akt signal transduction pathway.
METHODS: Gastric cancer MGC-803 cells were cultured and then treated with 50 μg/L recombinant human MIF (rhMIF) with and without a PI3K inhibitor, LY294002 (25 μmol/L). MTT assay was used to detect the proliferation of MGC-803 cells. Cell cycle was detected by flow cytometry. Expression of cyclin D1 and p27Kip1 mRNA was by reverse transcription-polymerase chain reaction. Protein expression of phosphorylated Akt (p-Akt), Akt, cyclin D1 and p27Kip1 was examined by immunocytochemistry and Western blotting.
RESULTS: rhMIF significantly stimulated the proliferation of MGC-803 cells and cell cycle progression from G1 phase to S phase in a concentration- and time-dependent manner. After the MGC-803 cells were treated with rhMIF for 24 h, the expression of cyclin D1 was significantly up-regulated compared with the cells not treated with rhMIF at both mRNA and protein levels (0.97 ± 0.02 vs 0.74 ± 0.01, P = 0.002; 0.98 ± 0.05 vs 0.69 ± 0.04, P = 0.003). The p27Kip1 was down-regulated but only statistically significant at the protein level. rhMIF significantly increased the expression of p-Akt, which reached the peak at 30 min, but did not affect the expression of Akt. However, LY294002 inhibited all the effects of rhMIF.
CONCLUSION: Macrophage MIF increases the proliferation of gastric cancer cells, induces the expression of cyclin D1 at the transcriptional level and inhibits the expression of p27Kip1 at the post-transcriptional level via the PI3K/Akt pathway.
Collapse
|
23
|
Schlafen-3: a novel regulator of intestinal differentiation. Biochem Biophys Res Commun 2009; 388:752-6. [PMID: 19703412 DOI: 10.1016/j.bbrc.2009.08.094] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 08/17/2009] [Indexed: 01/27/2023]
Abstract
Schlafen-3 (Slfn-3), a novel gene, has been shown to be a negative regulator of proliferation. The current investigation was undertaken to determine whether Slfn-3 might play a role in regulating cellular differentiation. Butyric acid, a short chain fatty acid, which induced differentiation of intestinal cells as evidenced by increased alkaline phosphatase (ALP) activity in the rat small intestinal IEC-6 cells, also produced a marked increase in Slfn-3 expression. Furthermore, overexpression of Slfn-3 caused stimulation of ALP activity in IEC-6 cells, which was exacerbated by butyrate. On the other hand, downregulation of Slfn-3 by slfn-3-si-RNA greatly attenuated the butyrate-mediated induction of differentiation of IEC-6 cells. Additionally, we observed that increased expression of Slfn-3 in colon cancer HCT-116 cells stimulated TGF-beta expression and modulated expression of its downstream effectors as evidenced by increased expression of p27kip1 and downregulation of CDK-2. In addition, Slfn-3 increases E-cadherin expression but downregulates beta-catenin. In conclusion, our data show that Slfn-3 plays a critical role in regulating intestinal mucosal differentiation. Furthermore our data also show that TGF-beta signaling pathway plays an important role in mediating slfn-3 induced differentiation.
Collapse
|
24
|
Tsai S, Hollenbeck ST, Ryer EJ, Edlin R, Yamanouchi D, Kundi R, Wang C, Liu B, Kent KC. TGF-beta through Smad3 signaling stimulates vascular smooth muscle cell proliferation and neointimal formation. Am J Physiol Heart Circ Physiol 2009; 297:H540-9. [PMID: 19525370 DOI: 10.1152/ajpheart.91478.2007] [Citation(s) in RCA: 125] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The objective of this study was to better understand the role of transforming growth factor-beta (TGF-beta) and its primary signaling protein Smad3 in the development of intimal hyperplasia. Male Sprague-Dawley rats underwent left carotid balloon injury followed by intra-arterial infection with adenovirus-expressing Smad3 (AdSmad3). In uninfected injured arteries, endogenous Smad3 was upregulated with the expression peaking at 14 days. Moreover, in arteries infected with AdSmad3, we observed an enhancement of intimal hyperplasia and increased vascular smooth muscle cell (VSMC) proliferation. The novel finding, that TGF-beta/Smad3 stimulated rather than inhibited VSMC proliferation, was confirmed in cultured VSMCs infected with AdSmad3 and treated with TGF-beta. To identify the mechanism underlying TGF-beta/Smad3-mediated VSMC proliferation, we studied the cyclin-dependent kinase inhibitor p27. Although the upregulation of Smad3 in VSMCs had no significant effect on total p27 levels, Smad3 did stimulate the phosphorylation of p27 at serine-10 as well as the nuclear export of p27, events associated with cell proliferation. Furthermore, serine-10-phosphorylated p27 was also increased in AdSmad3-infected injured rat carotid arteries, demonstrating the existence of this same mechanism in vivo. In conclusion, our findings identify a novel mechanism for the effect of TGF-beta on intimal hyperplasia. In the presence of elevated levels of Smad3 that develop in response to injury, TGF-beta stimulates smooth muscle cell proliferation through a mechanism involving the phosphorylation and nuclear export of p27.
Collapse
Affiliation(s)
- Shirling Tsai
- Department of Surgery, Division of Vascular Surgery, New York Presbyterian Hospital and Weill Medical College of Cornell University, New York, New York, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
25
|
McCullar JS, Oesterle EC. Cellular targets of estrogen signaling in regeneration of inner ear sensory epithelia. Hear Res 2009; 252:61-70. [PMID: 19450430 PMCID: PMC2975607 DOI: 10.1016/j.heares.2009.01.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2008] [Revised: 01/16/2009] [Accepted: 01/22/2009] [Indexed: 01/19/2023]
Abstract
Estrogen signaling in auditory and vestibular sensory epithelia is a newly emerging focus propelled by the role of estrogen signaling in many other proliferative systems. Understanding the pathways with which estrogen interacts can provide a means to identify how estrogen may modulate proliferative signaling in inner ear sensory epithelia. Reviewed herein are two signaling families, EGF and TGFbeta. Both pathways are involved in regulating proliferation of supporting cells in mature vestibular sensory epithelia and have well characterized interactions with estrogen signaling in other systems. It is becoming increasingly clear that elucidating the complexity of signaling in regeneration will be necessary for development of therapeutics that can initiate regeneration and prevent progression to a pathogenic state.
Collapse
Affiliation(s)
- Jennifer S. McCullar
- Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-Head and Neck Surgery, University of Washington, CHDD CD176, P.O. Box 357923, Seattle, WA 98195, USA
| | - Elizabeth C. Oesterle
- Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-Head and Neck Surgery, University of Washington, CHDD CD176, P.O. Box 357923, Seattle, WA 98195, USA
| |
Collapse
|
26
|
de Andrade Sá ER, Bitencourt B, Alvares EP, Gama P. In vivo effects of TGFbeta1 on the growth of gastric epithelium in suckling rats. ACTA ACUST UNITED AC 2007; 146:293-302. [PMID: 18068234 DOI: 10.1016/j.regpep.2007.11.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2007] [Revised: 10/19/2007] [Accepted: 11/01/2007] [Indexed: 10/22/2022]
Abstract
As the content of Transforming Growth Factor-beta (TGFbeta) wanes in the milk of lactating rat, an increase in TGFbeta is observed in the gastric epithelia concomitant with differentiation of the glands upon weaning. Whereas TGFbeta has been shown to inhibit the proliferation of gastrointestinal cells in vitro, its functional significance and mechanisms of action have not been studied in vivo. Therefore, we administered TGFbeta1 (1 ng/g body wt.) to 14-day-old rats in which the gastric epithelium was induced to proliferate by fasting, and determined the involvement of signaling through Smads and the impact on epithelial cell proliferation and apoptosis. After the gavage, we observed the progressive increase of active TGFbeta1 while TbetaRII-receptor remained constant in the gastric mucosa. By immunohistochemistry, we showed Smad2/3 increase at 60 min (p<0.05) and Smad2 phosphorylation/activation and translocation to the nucleus most prominently between 0 and 30 min after treatment (p<0.05). Importantly, TGFbeta1 inhibited cell proliferation (p<0.05), which was estimated by BrDU pulse-labeling 12 h after gavage. Lower proliferation was reflected by increased p27(kip1) at 2 h (p<0.05). Also, TGFbeta1 increased apoptosis as measured by M30 labeling at 60 and 180 min (p<0.001), and by morphological features at 12 h (p<0.05). In addition, we observed higher levels of activated caspase 3 (17 kDa) from 0 to 30 min. Altogether, these data indicate a direct effect of TGFbeta1 signaling through Smads on both inhibiting proliferation, through alteration of cycle proteins, and inducing apoptosis of gastric epithelial cells in vivo. Further, the studies suggest a potential role for both milk and tissue-expressed TGFbeta1 in gastric growth during postnatal development.
Collapse
Affiliation(s)
- Eunice Ribeiro de Andrade Sá
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences, Av Prof Lineu Prestes 1524 ICB I, University of São Paulo, São Paulo, SP, 05508-900, Brazil
| | | | | | | |
Collapse
|