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Wang Y, Li Q, Yuan Z, Ma S, Shao S, Wu Y, Wang Z, Li Q, Gao L, Zhao M, Zhao J. Statin Use and Benefits of Thyroid Function: A Retrospective Cohort Study. Front Endocrinol (Lausanne) 2021; 12:578909. [PMID: 33737906 PMCID: PMC7962670 DOI: 10.3389/fendo.2021.578909] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 01/07/2021] [Indexed: 12/15/2022] Open
Abstract
PURPOSE Previous studies have suggested that cholesterol may influence thyroid function. Since statins are widely used for their cholesterol-lowering effect, we aimed to assess the association between statin use and thyroid function, and also to explore the role of the cholesterol-lowering effect in it. METHODS We performed a retrospective cohort study derived from REACTION study. Eligible subjects receiving statin therapy were included in the statin group, and sex-, age-, total cholesterol (TC)-, and thyroid function-matched participants without lipid-lowering therapy were included in the control group. The median follow-up time was three years. Outcomes of thyroid function were evaluated at the end of follow-up. We used multivariable regression models to assess the association between statin use and outcomes of thyroid function, and also performed mediation analyses to explore the role of cholesterol in it. RESULTS A total of 5,146 participants were screened, and 201 eligible subjects in the statin group and 201 well-matched subjects in the control group were analyzed. At the end of follow-up, TC and thyroid-stimulating hormone (TSH) levels in the statin group were lower than those in the control group (both p < 0.05), and the percentage of euthyroid subjects was higher in the statin group (88.06% vs. 76.12%, p = 0.002). The incidence rate of subclinical hypothyroidism (SCH) in euthyroid subjects was lower in the statin group (6.29% vs. 14.86%, p = 0.009), and the remission rate among subjects with SCH was higher in the statin group (50.00% vs. 15.38%, p = 0.008). In multivariable regression analyses, statin use was independently associated with lower TSH levels and higher odds to be euthyroid (OR 2.335, p = 0.004) at the end of follow-up. Mediation analyses showed the association between statin use and TSH levels were mediated by TC changes during follow-up. CONCLUSION Statin use was associated with benefits of thyroid function, and TC changes serve as a mediator of the association between statin use and TSH levels. Further studies are needed to clarify the possible underlying mechanism.
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Affiliation(s)
- Yupeng Wang
- Department of Endocrinology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
| | - Qihang Li
- Department of Endocrinology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
| | - Zhongshang Yuan
- Department of Biostatistics, School of Public Health, Shandong University, Jinan, China
| | - Shizhan Ma
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
| | - Shanshan Shao
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
| | - Yafei Wu
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
| | - Zhixiang Wang
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
| | - Qiu Li
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
| | - Ling Gao
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Department of Scientific Center, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
| | - Meng Zhao
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
- *Correspondence: Meng Zhao, ; Jiajun Zhao,
| | - Jiajun Zhao
- Department of Endocrinology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, China
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
- *Correspondence: Meng Zhao, ; Jiajun Zhao,
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Abstract
Folding of proteins is essential so that they can exert their functions. For proteins that transit the secretory pathway, folding occurs in the endoplasmic reticulum (ER) and various chaperone systems assist in acquiring their correct folding/subunit formation. N-glycosylation is one of the most conserved posttranslational modification for proteins, and in eukaryotes it occurs in the ER. Consequently, eukaryotic cells have developed various systems that utilize N-glycans to dictate and assist protein folding, or if they consistently fail to fold properly, to destroy proteins for quality control and the maintenance of homeostasis of proteins in the ER.
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Nakao H, Seko A, Ito Y, Sakono M. Dimerization of ER-resident molecular chaperones mediated by ERp29. Biochem Biophys Res Commun 2020; 536:52-58. [PMID: 33360823 DOI: 10.1016/j.bbrc.2020.12.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 12/08/2020] [Indexed: 11/30/2022]
Abstract
The lectin chaperones calnexin (CNX) and calreticulin (CRT) localized in the endoplasmic reticulum play important roles in glycoprotein quality control. Although the interaction between these lectin chaperones and ERp57 is well known, it has been recently reported that endoplasmic reticulum protein 29 (ERp29), a member of PDI family, interacts with CNX and CRT. The biochemical function of ERp29 is unclear because it exhibits no ERp57-like redox activity. In this study, we addressed the possibility that ER chaperones CNX and CRT are connected via ERp29, based on our observation that ERp29 exists as a dimer. As a result, we showed that CNX dimerizes through ERp29. These results endorse the hypothesis that ERp29 serves as a bridge that links two molecules of CNX. Also, we showed that similar complexes such as CNX-CRT were formed via ERp29.
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Affiliation(s)
- Hitomi Nakao
- Department of Applied Chemistry, University of Toyama 3190 Gofuku, Toyama, 930-855, Japan
| | - Akira Seko
- Japan Science and Technology Agency (JST), ERATO Ito Glycotrilogy Project, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
| | - Yukishige Ito
- Japan Science and Technology Agency (JST), ERATO Ito Glycotrilogy Project, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan; RIKEN Cluster for Pioneering Research 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan; Graduate School of Science, Osaka University Machikaneyama 1-1 Toyonaka, Osaka, 560-0043, Japan
| | - Masafumi Sakono
- Department of Applied Chemistry, University of Toyama 3190 Gofuku, Toyama, 930-855, Japan.
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Kozlov G, Gehring K. Calnexin cycle - structural features of the ER chaperone system. FEBS J 2020; 287:4322-4340. [PMID: 32285592 PMCID: PMC7687155 DOI: 10.1111/febs.15330] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/31/2020] [Accepted: 04/08/2020] [Indexed: 12/21/2022]
Abstract
The endoplasmic reticulum (ER) is the major folding compartment for secreted and membrane proteins and is the site of a specific chaperone system, the calnexin cycle, for folding N-glycosylated proteins. Recent structures of components of the calnexin cycle have deepened our understanding of quality control mechanisms and protein folding pathways in the ER. In the calnexin cycle, proteins carrying monoglucosylated glycans bind to the lectin chaperones calnexin and calreticulin, which recruit a variety of function-specific chaperones to mediate protein disulfide formation, proline isomerization, and general protein folding. Upon trimming by glucosidase II, the glycan without an inner glucose residue is no longer able to bind to the lectin chaperones. For proteins that have not yet folded properly, the enzyme UDP-glucose:glycoprotein glucosyltransferase (UGGT) acts as a checkpoint by adding a glucose back to the N-glycan. This allows the misfolded proteins to re-associate with calnexin and calreticulin for additional rounds of chaperone-mediated refolding and prevents them from exiting the ERs. Here, we review progress in structural studies of the calnexin cycle, which reveal common features of how lectin chaperones recruit function-specific chaperones and how UGGT recognizes misfolded proteins.
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Affiliation(s)
- Guennadi Kozlov
- From the Department of Biochemistry & Centre for Structural BiologyMcGill UniversityMontréalQCCanada
| | - Kalle Gehring
- From the Department of Biochemistry & Centre for Structural BiologyMcGill UniversityMontréalQCCanada
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5
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Brecker M, Khakhina S, Schubert TJ, Thompson Z, Rubenstein RC. The Probable, Possible, and Novel Functions of ERp29. Front Physiol 2020; 11:574339. [PMID: 33013490 PMCID: PMC7506106 DOI: 10.3389/fphys.2020.574339] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 08/14/2020] [Indexed: 12/16/2022] Open
Abstract
The luminal endoplasmic reticulum (ER) protein of 29 kDa (ERp29) is a ubiquitously expressed cellular agent with multiple critical roles. ERp29 regulates the biosynthesis and trafficking of several transmembrane and secretory proteins, including the cystic fibrosis transmembrane conductance regulator (CFTR), the epithelial sodium channel (ENaC), thyroglobulin, connexin 43 hemichannels, and proinsulin. ERp29 is hypothesized to promote ER to cis-Golgi cargo protein transport via COP II machinery through its interactions with the KDEL receptor; this interaction may facilitate the loading of ERp29 clients into COP II vesicles. ERp29 also plays a role in ER stress (ERS) and the unfolded protein response (UPR) and is implicated in oncogenesis. Here, we review the vast array of ERp29’s clients, its role as an ER to Golgi escort protein, and further suggest ERp29 as a potential target for therapies related to diseases of protein misfolding and mistrafficking.
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Affiliation(s)
- Margaret Brecker
- Cystic Fibrosis Center, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - Svetlana Khakhina
- Cystic Fibrosis Center, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - Tyler J. Schubert
- Cystic Fibrosis Center, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - Zachary Thompson
- Cystic Fibrosis Center, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
| | - Ronald C. Rubenstein
- Cystic Fibrosis Center, The Children’s Hospital of Philadelphia, Philadelphia, PA, United States
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, United States
- Division of Allergy and Pulmonary Medicine, Department of Pediatrics, Washington University in St. Louis School of Medicine, St. Louis, MO, United States
- *Correspondence: Ronald C. Rubenstein, ;
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Zhang X, Shao S, Zhao L, Yang R, Zhao M, Fang L, Li M, Chen W, Song Y, Xu C, Zhou X, Zhao J, Gao L. ER stress contributes to high-fat diet-induced decrease of thyroglobulin and hypothyroidism. Am J Physiol Endocrinol Metab 2019; 316:E510-E518. [PMID: 30620634 DOI: 10.1152/ajpendo.00194.2018] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Recent studies revealed the emerging role of excess uptake of lipids in the development of hypothyroidism. However, the underlying mechanism is largely unknown. We investigated the effect of high-fat diet (HFD) on thyroid function and the role of endoplasmic reticulum (ER) in HFD-induced hypothyroidism. Male Sprague-Dawley rats were fed with HFD or control diet for 18 wk. HFD rats showed an impaired thyroid function, with decreased thyroglobulin (Tg) level. We found the ER stress was triggered in HFD rat thyroid glands and palmitate-treated thyrocytes. Luminal swelling of ER in thyroid epithelial cells of HFD rats was also observed. The rate of Tg degradation increased in palmitate-treated thyrocytes. In addition, applying 4-phenyl butyric acid to alleviate ER stress in HFD rats improved the decrease of Tg and thyroid function. Withdrawal of the HFD improved thyroid function . In conclusion, we demonstrate that ER stress mediates the HFD-induced hypothyroidism, probably by impairing the production of Tg, and attenuation of ER stress improves thyroid function. Our study provides the understanding of how HFD induces hypothyroidism.
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Affiliation(s)
- Xiaohan Zhang
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Shanshan Shao
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Lifang Zhao
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Rui Yang
- Experimental Animal Center, Shandong Provincial Hospital Affiliated to Shandong University, Ji-nan, Shandong , China
| | - Meng Zhao
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Li Fang
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Mengzhu Li
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Wenbin Chen
- Scientific Center, Shandong Provincial Hospital Affiliated to Shandong University, Ji-nan, Shandong , China
| | - Yongfeng Song
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Chao Xu
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Xiaoming Zhou
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Jiajun Zhao
- Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong University , Shandong , China
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
| | - Ling Gao
- Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Ji-nan, Shandong , China
- Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Ji-nan, Shandong , China
- Scientific Center, Shandong Provincial Hospital Affiliated to Shandong University, Ji-nan, Shandong , China
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Satoh T, Kato K. Structural Aspects of ER Glycoprotein Quality-Control System Mediated by Glucose Tagging. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1104:149-169. [PMID: 30484248 DOI: 10.1007/978-981-13-2158-0_8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
N-linked oligosaccharides attached to proteins act as tags for glycoprotein quality control, ensuring their appropriate folding and trafficking in cells. Interactions with a variety of intracellular lectins determine glycoprotein fates. Monoglucosylated glycoforms are the hallmarks of incompletely folded glycoproteins in the protein quality-control system, in which glucosidase II and UDP-glucose/glycoprotein glucosyltransferase are, respectively, responsible for glucose trimming and attachment. In this review, we summarize a recently emerging view of the structural basis of the functional mechanisms of these key enzymes as well as substrate N-linked oligosaccharides exhibiting flexible structures, as revealed by applying a series of biophysical techniques including small-angle X-ray scattering, X-ray crystallography, high-speed atomic force microscopy , electron microscopy , and computational simulation in conjunction with NMR spectroscopy.
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Affiliation(s)
- Tadashi Satoh
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Aichi, Japan
| | - Koichi Kato
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Aichi, Japan. .,Exploratory Research Center on Life and Living Systems, National Institutes of Natural Sciences, Okazaki, Aichi, Japan.
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Kozlov G, Muñoz-Escobar J, Castro K, Gehring K. Mapping the ER Interactome: The P Domains of Calnexin and Calreticulin as Plurivalent Adapters for Foldases and Chaperones. Structure 2017; 25:1415-1422.e3. [DOI: 10.1016/j.str.2017.07.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 06/09/2017] [Accepted: 07/25/2017] [Indexed: 10/18/2022]
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Nakao H, Seko A, Ito Y, Sakono M. PDI family protein ERp29 recognizes P-domain of molecular chaperone calnexin. Biochem Biophys Res Commun 2017; 487:763-767. [DOI: 10.1016/j.bbrc.2017.04.139] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 04/25/2017] [Indexed: 11/16/2022]
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Li X, Zhen D, Zhao M, Liu L, Guan Q, Zhang H, Ge S, Tang X, Gao L. Natural history of mild subclinical hypothyroidism in a middle-aged and elderly Chinese population: a prospective study. Endocr J 2017; 64:437-447. [PMID: 28302959 DOI: 10.1507/endocrj.ej16-0549] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Subclinical hypothyroidism (SCH) has a high global prevalence. Most SCH patients have mild cases (thyrotropin ≤10 mIU/L). Treatment recommendations for mild SCH are controversial, which raises concerns about the natural history of mild SCH. We aimed to clarify the natural history of mild SCH. This is a prospective population-based study. We measured thyroid function in 11,000 participants in the REACTION study and followed 505 newly diagnosed mild SCH patients aged 40-years or older between 2011 and 2014. Logistic regression analysis was used to seek baseline parameters associated with the natural outcomes of mild SCH. Among 505 mild SCH patients, 221 (43.8%) had persistent SCH, 251 (49.7%) reverted to euthyroidism, and 17 (3.4%) progressed to overt hypothyroidism (OH). Patients with higher baseline total cholesterol (TC, between 201.0-240.0 mg/dL or >240.0 mg/dL vs. <201.0 mg/dL, p = 0.048 and 0.006, respectively) or positive thyroid peroxidase antibodies (TPOAb, p = 0.009) had higher risks of progression to OH, while those with higher baseline creatinine (CR, between 0.71-0.80 mg/dL or >0.80 mg/dL vs. ≤0.65 mg/dL, p = 0.031 and 0.004, respectively), higher baseline thyrotropin (≥7 mIU/L, p < 0.001) or older (>60 years vs. ≤50 years, p = 0.012) had lower odds of reverting to euthyroidism. In conclusion, TPOAb and TC seem to be more important predictors of progression to OH than initial thyrotropin, whereas high baseline thyrotropin or CR were negative correlated with reversion to euthyroidism. The prognostic value of TC and CR in mild SCH should be considered.
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Affiliation(s)
- Xiang Li
- Department of Endocrinology and Metabolism, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Donghu Zhen
- Department of Endocrinology and Metabolism, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Meng Zhao
- Department of Endocrinology and Metabolism, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Lu Liu
- Department of Endocrinology and Metabolism, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Qingbo Guan
- Department of Endocrinology and Metabolism, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Haiqing Zhang
- Department of Endocrinology and Metabolism, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Shujian Ge
- Department of Science and Education, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Xulei Tang
- Department of Endocrinology and Metabolism, The First Hospital of Lanzhou University, Lanzhou 730000, China
| | - Ling Gao
- Scientific Center, Shandong Provincial Hospital affiliated to Shandong University, Shandong 250021, China
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Huang C, Wang JJ, Jing G, Li J, Jin C, Yu Q, Falkowski MW, Zhang SX. Erp29 Attenuates Cigarette Smoke Extract-Induced Endoplasmic Reticulum Stress and Mitigates Tight Junction Damage in Retinal Pigment Epithelial Cells. Invest Ophthalmol Vis Sci 2016; 56:6196-207. [PMID: 26431474 DOI: 10.1167/iovs.15-16795] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
PURPOSE Endoplasmic reticulum protein 29 (ERp29) is a novel chaperone that was recently found decreased in human retinas with AMD. Herein, we examined the effect of ERp29 on cigarette smoke-induced RPE apoptosis and tight junction disruption. METHODS Cultured human RPE (HRPE) cells (ARPE-19) or mouse RPE eyecup explants were exposed to cigarette smoke extract (CSE) for short (up to 24 hours) or long (up to 3 weeks) periods. Expression of ERp29 was up- and downregulated by adenovirus and siRNA, respectively. Endoplasmic reticulum stress markers, apoptosis, and cell death, the expression and distribution of tight junction protein ZO-1, transepithelial electrical resistance (TEER), and F-actin expression were examined. RESULTS Endoplasmic reticulum protein 29 was significantly increased by short-term exposure to CSE in ARPE-19 cells or eyecup explants but was reduced after 3-week exposure. Overexpression of ERp29 increased the levels of GRP78, p58(IPK), and Nrf-2, while reducing p-eIF2α and C/EBP homologous protein (CHOP), and protected RPE cells from CSE-induced apoptosis. In contrast, knockdown of ERp29 decreased the levels of p58(IPK) and Nrf2, but increased p-eIF2α and CHOP and exacerbated CSE-triggered cell death. In addition, overexpression of ERp29 attenuated CSE-induced reduction in ZO-1 and enhanced the RPE barrier function, as measured by TEER. Knockdown of ERp29 decreased the level of ZO-1 protein. These effects were associated with changes in the expression of cytoskeleton F-actin. CONCLUSIONS Endoplasmic reticulum protein 29 attenuates CSE-induced ER stress and enhances cell viability and barrier integrity of RPE cells, and therefore may act as a protective mechanism for RPE survival and activity.
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Affiliation(s)
- Chuangxin Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China 2Departments of Ophthalmology and Biochemistry, Ross Eye Institute, University at Buffalo, State University of New York, Buffalo, New York, United
| | - Joshua J Wang
- Departments of Ophthalmology and Biochemistry, Ross Eye Institute, University at Buffalo, State University of New York, Buffalo, New York, United States 3SUNY Eye Institute, State University of New York, Buffalo, New York, United States 4Department of Med
| | - Guangjun Jing
- Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States
| | - Junhua Li
- Departments of Ophthalmology and Biochemistry, Ross Eye Institute, University at Buffalo, State University of New York, Buffalo, New York, United States 3SUNY Eye Institute, State University of New York, Buffalo, New York, United States
| | - Chenjin Jin
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Qiang Yu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Marek W Falkowski
- Departments of Ophthalmology and Biochemistry, Ross Eye Institute, University at Buffalo, State University of New York, Buffalo, New York, United States
| | - Sarah X Zhang
- Departments of Ophthalmology and Biochemistry, Ross Eye Institute, University at Buffalo, State University of New York, Buffalo, New York, United States 3SUNY Eye Institute, State University of New York, Buffalo, New York, United States
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12
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Endoplasmic Reticulum Protein 29 Protects Axotomized Neurons from Apoptosis and Promotes Neuronal Regeneration Associated with Erk Signal. Mol Neurobiol 2014; 52:522-32. [DOI: 10.1007/s12035-014-8840-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Accepted: 07/30/2014] [Indexed: 12/15/2022]
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13
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Liu R, Zhao W, Zhao Q, Liu SJ, Liu J, He M, Xu Y, Wang W, Liu W, Xia QJ, Li CY, Wang TH. Endoplasmic Reticulum Protein 29 Protects Cortical Neurons From Apoptosis and Promoting Corticospinal Tract Regeneration to Improve Neural Behavior via Caspase and Erk Signal in Rats with Spinal Cord Transection. Mol Neurobiol 2014; 50:1035-48. [DOI: 10.1007/s12035-014-8681-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Accepted: 03/11/2014] [Indexed: 12/18/2022]
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14
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ERp29 regulates response to doxorubicin by a PERK-mediated mechanism. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2011; 1813:1165-71. [DOI: 10.1016/j.bbamcr.2011.03.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2010] [Revised: 02/14/2011] [Accepted: 03/07/2011] [Indexed: 11/22/2022]
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15
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Suaud L, Miller K, Alvey L, Yan W, Robay A, Kebler C, Kreindler JL, Guttentag S, Hubbard MJ, Rubenstein RC. ERp29 regulates DeltaF508 and wild-type cystic fibrosis transmembrane conductance regulator (CFTR) trafficking to the plasma membrane in cystic fibrosis (CF) and non-CF epithelial cells. J Biol Chem 2011; 286:21239-53. [PMID: 21525008 DOI: 10.1074/jbc.m111.240267] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Sodium 4-phenylbutyrate (4PBA) improves the intracellular trafficking of ΔF508-CFTR in cystic fibrosis (CF) epithelial cells. The underlying mechanism is uncertain, but 4PBA modulates the expression of some cytosolic molecular chaperones. To identify other 4PBA-regulated proteins that might regulate ΔF508-CFTR trafficking, we performed a differential display RT-PCR screen on IB3-1 CF bronchiolar epithelial cells exposed to 4PBA. One transcript up-regulated by 4PBA encoded ERp29, a luminal resident of the endoplasmic reticulum (ER) thought to be a novel molecular chaperone. We tested the hypothesis that ERp29 is a 4PBA-regulated ER chaperone that influences ΔF508-CFTR trafficking. ERp29 mRNA and protein expression was significantly increased (∼1.5-fold) in 4PBA-treated IB3-1 cells. In Xenopus oocytes, ERp29 overexpression increased the functional expression of both wild-type and ΔF508-CFTR over 3-fold and increased wild-type cystic fibrosis transmembrane conductance regulator (CFTR) plasma membrane expression. In CFBE41o- WT-CFTR cells, expression of and short circuit currents mediated by CFTR decreased upon depletion of ERp29 as did maturation of newly synthesized CFTR. In IB3-1 cells, ΔF508-CFTR co-immunoprecipitated with endogenous ERp29, and overexpression of ERp29 led to increased ΔF508-CFTR expression at the plasma membrane. These data suggest that ERp29 is a 4PBA-regulated ER chaperone that regulates WT-CFTR biogenesis and can promote ΔF508-CFTR trafficking in CF epithelial cells.
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Affiliation(s)
- Laurence Suaud
- Division of Pulmonary Medicine and Cystic Fibrosis Center, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA
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16
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Jin CY, Song SH, Go YH, Kwon KS, Yun EY, Goo TW, Yeo JH, Kim SW, Choi JS, Yu K, Kwon OY. Sericin Enhances Secretion of Thyroglobulin in the Thyrocytes. ACTA ACUST UNITED AC 2010. [DOI: 10.5352/jls.2010.20.8.1249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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17
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Ying X, Liu Y, Guo Q, Qu F, Guo W, Zhu Y, Ding Z. Endoplasmic reticulum protein 29 (ERp29), a protein related to sperm maturation is involved in sperm-oocyte fusion in mouse. Reprod Biol Endocrinol 2010; 8:10. [PMID: 20132541 PMCID: PMC2836359 DOI: 10.1186/1477-7827-8-10] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Accepted: 02/04/2010] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Sperm-oocyte fusion is a critical step in fertilization, which requires a series of proteins from both spermatozoa and oocyte to mediate membrane adhesion and subsequent fusion. A rat spermatozoa membrane protein is endoplasmic reticulum protein 29 (ERp29), which significantly increases on the sperm surface as well as in the cytoplasm of epididymal epithelia from caput to cauda as the sperm undergo epididymal maturation. Moreover, ERp29 facilitates viral infection via mediating membrane penetration. We determined if in addition to promoting sperm maturation ERp29 may also play a role in facilitating gamete fusion during the fertilization process. METHODS Laser scanning confocal microscopy (LSCM) and Western blot analysis were employed to probe for ERp29 protein in BALB/c mouse epididymal and acrosome-reacted spermatozoa. We prepared rabbit polyclonal antibodies against mouse recombinant ERp29 (rERp29) to characterize: 1) fertilization rate (FR); 2) fertilization index (FI); 3) sperm motility and 4) acrosome reaction (AR). RESULTS Confocal microscopy indicated that ERp29 was partially localized at the sperm head of the epididymal caput as well as over the whole head and part of the principal piece of the tail region from the epididymal cauda. However, when the acrosome reacted, ERp29 remained in the equatorial and post-acrosomal regions of the sperm head, which is the initial site of sperm-oocyte membrane fusion. Such localization changes were confirmed based on the results of Western blot analysis. Furthermore, the antibodies against mouse rERp29 inhibited the spermatozoa from penetrating into the zona pellucida (ZP)-free oocytes. The functional blocking antibodies reduced both mouse sperm-oocyte FR and FI at concentrations of 100 and 200 micro g/ml compared with pre-immunized rabbit IgG or with anti-mouse recombinant bactericidal/permeability-increasing protein (BPI, a sperm surface protein unrelated to sperm-oocyte fusion) antibodies (100 micro g/ml), but they had no effect on sperm motility and AR. CONCLUSION This study demonstrates that ERp29 on mouse spermatozoa membrane changes during epididymal transit and AR. Accordingly, in mice this protein may be one of the important factors involved in sperm fertilization by facilitating sperm-oocyte membrane fusion.
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Affiliation(s)
- Xiaoqian Ying
- Shanghai Key Laboratory for Reproductive Medicine, Department of Histology and Embryology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Yue Liu
- Shanghai Key Laboratory for Reproductive Medicine, Department of Histology and Embryology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Qiangsu Guo
- Shanghai Key Laboratory for Reproductive Medicine, Department of Histology and Embryology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Fei Qu
- Shanghai Key Laboratory for Reproductive Medicine, Department of Histology and Embryology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Wei Guo
- Shanghai Key Laboratory for Reproductive Medicine, Department of Histology and Embryology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Yemin Zhu
- Shanghai Key Laboratory for Reproductive Medicine, Department of Histology and Embryology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
| | - Zhide Ding
- Shanghai Key Laboratory for Reproductive Medicine, Department of Histology and Embryology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
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Santamaría E, Mora MI, Carro-Roldán E, Molina M, Fernández-Irigoyen J, Marconi P, Manservigi R, Greco A, Epstein AL, Prieto J, Hernández-Alcoceba R, Corrales FJ. Identification of replication-competent HSV-1 Cgal+ strain targets in a mouse model of human hepatocarcinoma xenograft. J Proteomics 2009; 73:153-60. [DOI: 10.1016/j.jprot.2009.06.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 06/08/2009] [Accepted: 06/10/2009] [Indexed: 12/17/2022]
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Ogata T, Machida S, Oishi Y, Higuchi M, Muraoka I. Differential cell death regulation between adult-unloaded and aged rat soleus muscle. Mech Ageing Dev 2009; 130:328-36. [DOI: 10.1016/j.mad.2009.02.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2008] [Revised: 01/30/2009] [Accepted: 02/03/2009] [Indexed: 10/21/2022]
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20
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Zhang B, Wang M, Yang Y, Wang Y, Pang X, Su Y, Wang J, Ai G, Zou Z. ERp29 is a radiation-responsive gene in IEC-6 cell. JOURNAL OF RADIATION RESEARCH 2008; 49:587-596. [PMID: 18802324 DOI: 10.1269/jrr.08014] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
ERp29 is a resident protein of the endoplasmic reticulum (ER) lumen, which is thought to be involved in the folding of secretory proteins. In our previous work, it was found that, when treated with ionizing radiation (IR), the ERp29 expression was increased in mouse intestinal epithelia and cultured IEC-6 cells, which suggested that ERp29 might be a radiation-induced gene. The current work is to confirm the induction of ERp29 by IR and to analyze its role in irradiated IEC-6 cells. Our results showed that ERp29 expression was elevated by IR in IEC-6 cells at mRNA and protein levels in a time-dependent manner. IEC-6 cells with different exogenous ERp29 expression were obtained by transfection with sense and antisense expression vectors of ERp29 coding region. As ERp29 expression was inhibited, these cells exhibited more serious radiation injury and more sensitivity to IR-induced apoptosis. To further elucidate the induction of ERp29, we analyzed the XBP1 expression after IR. Results showed that the spliced form of XBP1 mRNA rapidly reached a peak at 3 hours after irradiation, which indicated that UPR sensor was involved in radiation and might be a reason to induce ERp29 expression. Our results demonstrate that ERp29 is a radiation associated protein and plays an important role in protecting cells from IR.
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Affiliation(s)
- Bo Zhang
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China
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21
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Shnyder SD, Mangum JE, Hubbard MJ. Triplex profiling of functionally distinct chaperones (ERp29/PDI/BiP) reveals marked heterogeneity of the endoplasmic reticulum proteome in cancer. J Proteome Res 2008; 7:3364-72. [PMID: 18598068 DOI: 10.1021/pr800126n] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The biomedical need for streamlined approaches to monitor proteome dynamics is growing rapidly. This study examined the ability of a knowledge-based triplex-profiling strategy (i.e., three functionally distinct chaperones, ERp29/PDI/BiP) to clarify uncertainties about how cancer affects the endoplasmic reticulum (ER) proteome. Investigating a wide range of samples at the tissue and cellular levels (>114 samples from 9 tissues of origin), we obtained consistent evidence that the ER proteome undergoes a major but variable expansion in cancer. Three factors having a strong influence on the ER proteome were identified (cancer-cell type, growth rate, culture mode), and the functionally enigmatic chaperone ERp29 was linked distinctively to histogenetic aspects of tumorigenesis. These findings justify pursuit of the ER-proteome as a medical target in cancer, validate ERp29/PDI/BiP profiling as a streamlined yet powerful measure of ER-proteome dynamics, and suggest that biomarker sets based on distinct functionalities could have broader biomedical utility.
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Weitzdörfer R, Höger H, Burda G, Pollak A, Lubec G. Differences in Hippocampal Protein Expression at 3 Days, 3 Weeks, and 3 Months Following Induction of Perinatal Asphyxia in the Rat. J Proteome Res 2008; 7:1945-52. [DOI: 10.1021/pr700835y] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Rachel Weitzdörfer
- Department of Pediatrics, Medical University of Vienna, Waehringer Guertel 18, 1090 Vienna, Austria, and Division for Laboratory Animal Science and Genetics, Medical University of Vienna, Brauhausgasse 34, 2325 Himberg, Austria
| | - Harald Höger
- Department of Pediatrics, Medical University of Vienna, Waehringer Guertel 18, 1090 Vienna, Austria, and Division for Laboratory Animal Science and Genetics, Medical University of Vienna, Brauhausgasse 34, 2325 Himberg, Austria
| | - Gudrun Burda
- Department of Pediatrics, Medical University of Vienna, Waehringer Guertel 18, 1090 Vienna, Austria, and Division for Laboratory Animal Science and Genetics, Medical University of Vienna, Brauhausgasse 34, 2325 Himberg, Austria
| | - Arnold Pollak
- Department of Pediatrics, Medical University of Vienna, Waehringer Guertel 18, 1090 Vienna, Austria, and Division for Laboratory Animal Science and Genetics, Medical University of Vienna, Brauhausgasse 34, 2325 Himberg, Austria
| | - Gert Lubec
- Department of Pediatrics, Medical University of Vienna, Waehringer Guertel 18, 1090 Vienna, Austria, and Division for Laboratory Animal Science and Genetics, Medical University of Vienna, Brauhausgasse 34, 2325 Himberg, Austria
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Stockwin LH, Bumke MA, Yu SX, Webb SP, Collins JR, Hollingshead MG, Newton DL. Proteomic Analysis Identifies Oxidative Stress Induction by Adaphostin. Clin Cancer Res 2007; 13:3667-81. [PMID: 17575232 DOI: 10.1158/1078-0432.ccr-07-0025] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Activities distinct from inhibition of Bcr/abl have led to adaphostin (NSC 680410) being described as "a drug in search of a mechanism." In this study, proteomic analysis of adaphostin-treated myeloid leukemia cell lines was used to further elucidate a mechanism of action. EXPERIMENTAL DESIGN HL60 and K562 cells treated with adaphostin for 6, 12, or 24 h were analyzed using two-dimensional PAGE. Differentially expressed spots were excised, digested with trypsin, and analyzed by liquid chromatography-tandem mass spectrometry. The contribution of the redox-active hydroquinone group in adaphostin was also examined by carrying out proteomic analysis of HL60 cells treated with a simple hydroquinone (1,4-dihydroxybenzene) or H(2)O(2). RESULTS Analysis of adaphostin-treated cells identified 49 differentially expressed proteins, the majority being implicated in the response to oxidative stress (e.g., CALM, ERP29, GSTP1, PDIA1) or induction of apoptosis (e.g., LAMA, FLNA, TPR, GDIS). Interestingly, modulation of these proteins was almost fully prevented by inclusion of an antioxidant, N-acetylcysteine. Validation of the proteomic data confirmed GSTP1 as an adaphostin resistance gene. Subsequent analysis of HL60 cells treated with 1,4-dihydroxybenzene or H(2)O(2) showed similar increases in intracellular peroxides and an almost identical proteomic profiles to that of adaphostin treatment. Western blotting of a panel of cell lines identified Cu/Zn superoxide dismutase (SOD) as correlating with adaphostin resistance. The role of SOD as a second adaphostin resistance gene was confirmed by demonstrating that inhibition of SOD using diethyldithiocarbamate increased adaphostin sensitivity, whereas transfection of SOD I attenuated toxicity. Importantly, treatment with 1,4-dihydroxybenzene or H(2)O(2) replicated adaphostin-induced Bcr/abl polypeptide degradation, suggesting that kinase inhibition is a ROS-dependent phenomenon. CONCLUSION Adaphostin should be classified as a redox-active-substituted dihydroquinone.
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Affiliation(s)
- Luke H Stockwin
- Developmental Therapeutics Program, Science Applications International Corporation Frederick, Frederick, Maryland 21702, USA
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Guo W, Qu F, Xia L, Guo Q, Ying X, Ding Z. Identification and characterization of ERp29 in rat spermatozoa during epididymal transit. Reproduction 2007; 133:575-84. [PMID: 17379652 DOI: 10.1530/rep-06-0301] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The mammalian epididymis is able to create sequential changes in the composition of luminal fluid throughout its length, wherein spermatozoa undergo morphological, biochemical, and physiological modifications. Subsequently, spermatozoa acquire the ability for fertilization upon reaching the epididymal cauda. In this study, protein variations in Sprague–Dawley rat spermatozoa along the caput and caudal regions of epididymis were investigated by high-resolution two-dimensional gel electrophoresis (2DE) in combination with mass spectrometry. From total protein spots on the 2DE maps, 43 spots were shown to be significantly modified as sperm traverse the epididymis, and seven unambiguous proteins were identified from them. Finally, using indirect immunofluorescence, we demonstrated that localization of one of these seven proteins, the endoplasmic reticulum protein (ERp29) precursor, which was first reported in mammalian spermatozoa, was apparently up-regulated as the sperm underwent epididymal maturation and expressed mainly on caudal sperm. Western blot analysis also revealed that ERp29 precursor, from both whole spermatozoa and membrane proteins, increased significantly as the sperm underwent epididymal maturation. Furthermore, the results from immunofluorescence-stained epididymal frozen sections demonstrated that ERp29 was localized in cytoplasm of epididymal epithelia, and the fluorescence intensity was significantly higher in the caudal epididymis than in the caput. These clues indicated that the ERp29 precursor, perhaps related to secretory protein synthesis and absorbed by spermatozoa, may play a vital role in sperm maturation during the epididymal transit, particularly, in the sperm/organelle membrane.
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Affiliation(s)
- Wei Guo
- Shanghai Key Laboratory for Reproductive Medicine, Histology and Embryology, School of Medicine, Shanghai Jiao Tong University, No. 280, Chong Qing Rd. (South), Shanghai 200025, China
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Bengtsson S, Krogh M, Szigyarto CAK, Uhlen M, Schedvins K, Silfverswärd C, Linder S, Auer G, Alaiya A, James P. Large-Scale Proteomics Analysis of Human Ovarian Cancer for Biomarkers. J Proteome Res 2007; 6:1440-50. [PMID: 17315909 DOI: 10.1021/pr060593y] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ovarian cancer is usually found at a late stage when the prognosis is often bad. Relative survival rates decrease with tumor stage or grade, and the 5-year survival rate for women with carcinoma is only 38%. Thus, there is a great need to find biomarkers that can be used to carry out routine screening, especially in high-risk patient groups. Here, we present a large-scale study of 64 tissue samples taken from patients at all stages and show that we can identify statistically valid markers using nonsupervised methods that distinguish between normal, benign, borderline, and malignant tissue. We have identified 217 of the significantly changing protein spots. We are expressing and raising antibodies to 35 of these. Currently, we have validated 5 of these antibodies for use in immunohistochemical analysis using tissue microarrays of healthy and diseased ovarian, as well as other, human tissues.
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Affiliation(s)
- Sofia Bengtsson
- Department of Protein Technology, Lund University, 221 84 Lund, Sweden
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Rainey-Barger EK, Mkrtchian S, Tsai B. Dimerization of ERp29, a PDI-like protein, is essential for its diverse functions. Mol Biol Cell 2007; 18:1253-60. [PMID: 17267685 PMCID: PMC1838973 DOI: 10.1091/mbc.e06-11-1004] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Protein disulfide isomerase (PDI)-like proteins act as oxido-reductases and chaperones in the endoplasmic reticulum (ER). How oligomerization of the PDI-like proteins control these activities is unknown. Here we show that dimerization of ERp29, a PDI-like protein, regulates its protein unfolding and escort activities. We have demonstrated previously that ERp29 induces the local unfolding of polyomavirus in the ER, a step required for viral infection. We now find that, in contrast to wild-type ERp29, a mutant ERp29 (D42A) that dimerizes inefficiently is unable to unfold polyomavirus or stimulate infection. A compensatory mutation that partially restores dimerization to the mutant ERp29 (G37D/D42A) rescues ERp29 activity. These results indicate that dimerization of ERp29 is crucial for its protein unfolding function. ERp29 was also suggested to act as an escort factor by binding to the secretory protein thyroglobulin (Tg) in the ER, thereby facilitating its secretion. We show that this escort function likewise depends on ERp29 dimerization. Thus our data demonstrate that dimerization of a PDI-like protein acts to regulate its diverse ER activities.
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Affiliation(s)
- Emily K. Rainey-Barger
- *Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Souren Mkrtchian
- Section of Pharmacogenetics, Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Billy Tsai
- *Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109; and
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