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Kang DS, Moriarty A, Wang YJ, Thomas A, Hao J, Unger BA, Klotz R, Ahmmed S, Amzaleg Y, Martin S, Vanapalli S, Xu K, Smith A, Shen K, Yu M. Ectopic Expression of a Truncated Isoform of Hair Keratin 81 in Breast Cancer Alters Biophysical Characteristics to Promote Metastatic Propensity. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2300509. [PMID: 37949677 PMCID: PMC10837353 DOI: 10.1002/advs.202300509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 08/28/2023] [Indexed: 11/12/2023]
Abstract
Keratins are an integral part of cell structure and function. Here, it is shown that ectopic expression of a truncated isoform of keratin 81 (tKRT81) in breast cancer is upregulated in metastatic lesions compared to primary tumors and patient-derived circulating tumor cells, and is associated with more aggressive subtypes. tKRT81 physically interacts with keratin 18 (KRT18) and leads to changes in the cytosolic keratin intermediate filament network and desmosomal plaque formation. These structural changes are associated with a softer, more elastically deformable cancer cell with enhanced adhesion and clustering ability leading to greater in vivo lung metastatic burden. This work describes a novel biomechanical mechanism by which tKRT81 promotes metastasis, highlighting the importance of the biophysical characteristics of tumor cells.
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Affiliation(s)
- Diane S. Kang
- Department of Stem Cell Biology and Regenerative MedicineKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- USC Norris Comprehensive Cancer CenterKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
| | - Aidan Moriarty
- Department of Stem Cell Biology and Regenerative MedicineKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- USC Norris Comprehensive Cancer CenterKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- Department of PharmacologyUniversity of Maryland School of MedicineBaltimoreMD21201USA
- Marlene and Stewart Greenebaum Comprehensive Cancer CenterUniversity of Maryland School of MedicineBaltimoreMD21201USA
| | - Yiru Jess Wang
- Department of Stem Cell Biology and Regenerative MedicineKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- USC Norris Comprehensive Cancer CenterKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- Department of PharmacologyUniversity of Maryland School of MedicineBaltimoreMD21201USA
- Marlene and Stewart Greenebaum Comprehensive Cancer CenterUniversity of Maryland School of MedicineBaltimoreMD21201USA
| | - Amal Thomas
- Department of Molecular and Computational BiologyUSC David and Dana Dornsife College of LettersArts and SciencesUniversity of Southern CaliforniaLos AngelesCA90089USA
| | - Jia Hao
- Department of Biomedical EngineeringViterbi School of EngineeringUniversity of Southern CaliforniaLos AngelesCA90089USA
| | - Bret A. Unger
- Department of ChemistryUniversity of California at BerkeleyBerkeleyCA94720USA
| | - Remi Klotz
- Department of Stem Cell Biology and Regenerative MedicineKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- USC Norris Comprehensive Cancer CenterKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- Department of PharmacologyUniversity of Maryland School of MedicineBaltimoreMD21201USA
- Marlene and Stewart Greenebaum Comprehensive Cancer CenterUniversity of Maryland School of MedicineBaltimoreMD21201USA
| | - Shamim Ahmmed
- Department of Chemical EngineeringTexas Tech UniversityLubbockTX79409USA
| | - Yonatan Amzaleg
- Department of Stem Cell Biology and Regenerative MedicineKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- USC Norris Comprehensive Cancer CenterKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
| | - Stuart Martin
- Department of PharmacologyUniversity of Maryland School of MedicineBaltimoreMD21201USA
- Marlene and Stewart Greenebaum Comprehensive Cancer CenterUniversity of Maryland School of MedicineBaltimoreMD21201USA
| | - Siva Vanapalli
- Department of Chemical EngineeringTexas Tech UniversityLubbockTX79409USA
| | - Ke Xu
- Department of ChemistryUniversity of California at BerkeleyBerkeleyCA94720USA
| | - Andrew Smith
- Department of Molecular and Computational BiologyUSC David and Dana Dornsife College of LettersArts and SciencesUniversity of Southern CaliforniaLos AngelesCA90089USA
| | - Keyue Shen
- Department of Biomedical EngineeringViterbi School of EngineeringUniversity of Southern CaliforniaLos AngelesCA90089USA
| | - Min Yu
- Department of Stem Cell Biology and Regenerative MedicineKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- USC Norris Comprehensive Cancer CenterKeck School of Medicine of the University of Southern CaliforniaLos AngelesCA90033USA
- Department of PharmacologyUniversity of Maryland School of MedicineBaltimoreMD21201USA
- Marlene and Stewart Greenebaum Comprehensive Cancer CenterUniversity of Maryland School of MedicineBaltimoreMD21201USA
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Li W, Li X, Gao Y, Xiong C, Tang Z. Emerging roles of RNA binding proteins in intervertebral disc degeneration and osteoarthritis. Orthop Surg 2023; 15:3015-3025. [PMID: 37803912 PMCID: PMC10694020 DOI: 10.1111/os.13851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 07/06/2023] [Accepted: 07/19/2023] [Indexed: 10/08/2023] Open
Abstract
The etiology of intervertebral disc degeneration (IDD) and osteoarthritis (OA) is complex and multifactorial. Both predisposing genes and environmental factors are involved in the pathogenesis of IDD and OA. Moreover, epigenetic modifications affect the development of IDD and OA. Dysregulated phenotypes of nucleus pulposus (NP) cells and OA chondrocytes, including apoptosis, extracellular matrix disruption, inflammation, and angiogenesis, are involved at all developmental stages of IDD and OA. RNA binding proteins (RBPs) have recently been recognized as essential post-transcriptional regulators of gene expression. RBPs are implicated in many cellular processes, such as proliferation, differentiation, and apoptosis. Recently, several RBPs have been reported to be associated with the pathogenesis of IDD and OA. This review briefly summarizes the current knowledge on the RNA-regulatory networks controlled by RBPs and their potential roles in the pathogenesis of IDD and OA. These initial findings support the idea that specific modulation of RBPs represents a promising approach for managing IDD and OA.
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Affiliation(s)
- Wen Li
- Department of EmergencyGeneral Hospital of Central Theater Command of PLAWuhanChina
| | - Xing‐Hua Li
- Department of EmergencyGeneral Hospital of Central Theater Command of PLAWuhanChina
| | - Yang Gao
- Department of OrthopaedicGeneral Hospital of Central Theater Command of PLAWuhanChina
| | - Cheng‐Jie Xiong
- Department of OrthopaedicGeneral Hospital of Central Theater Command of PLAWuhanChina
| | - Zhong‐Zhi Tang
- Department of EmergencyGeneral Hospital of Central Theater Command of PLAWuhanChina
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Jayasinghe R, Jayarajah U, Seneviratne S. Circulating Biomarkers in the Management of Breast Cancer. Biomark Med 2022. [DOI: 10.2174/9789815040463122010009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Circulating biomarkers have become a promising modality in the
management of many cancers. Similarly, in breast cancer, circulatory biomarkers are
useful, non-invasive methods in the diagnosis, prognostication, and evaluation of
response to treatment. Invasive surgical biopsies can be potentially replaced by “liquid
biopsy,” which involves analysing circulatory biomarkers that may reveal features of
primary and metastatic disease. Therefore, providing an insight into the cancer biology
can be utilised to monitor treatment response, treatment-induced adaptation and tumour
and disease progression through non-invasive means. The objective of this review is to
provide an overview of the current status of the circulating biomarkers highlighting
their promising impact on the management of patients with breast cancer.
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Affiliation(s)
- Ravindri Jayasinghe
- Faculty of Medicine, University of Colombo,Department of Surgery,Department of Surgery, Faculty of Medicine, University of Colombo, Colombo,Sri Lanka
| | - Umesh Jayarajah
- Faculty of Medicine, University of Colombo,Department of Surgery,Department of Surgery, Faculty of Medicine, University of Colombo, Colombo,Sri Lanka
| | - Sanjeewa Seneviratne
- Faculty of Medicine, University of Colombo,Department of Surgery,Department of Surgery, Faculty of Medicine, University of Colombo, Colombo,Sri Lanka
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Žaja R, Aydin G, Lippok BE, Feederle R, Lüscher B, Feijs KLH. Comparative analysis of MACROD1, MACROD2 and TARG1 expression, localisation and interactome. Sci Rep 2020; 10:8286. [PMID: 32427867 PMCID: PMC7237415 DOI: 10.1038/s41598-020-64623-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 04/20/2020] [Indexed: 02/06/2023] Open
Abstract
The posttranslational modification ADP-ribosylation is involved in many cellular processes, with distinct roles for poly- and mono(ADP-ribosyl)ation (PAR- and MARylation, respectively). Reversibility of intracellular MARylation was demonstrated with the discovery of MACROD1, MACROD2 and TARG1, three macrodomain-containing enzymes capable of reversing MARylation of proteins and RNA. While the three enzymes have identical activities in vitro, their roles in cells are unclear and published data are partially contradictory, possibly due to a lack of validated reagents. We developed monoclonal antibodies to study these proteins and analysed their tissue distribution and intracellular localisation. MACROD1 is most prevalent in mitochondria of skeletal muscle, MACROD2 localises to nucleo- and cytoplasm and is found so far only in neuroblastoma cells, whereas the more ubiquitously expressed TARG1 is present in nucleoplasm, nucleolus and stress granules. Loss of MACROD1 or loss of TARG1 leads to disruption of mitochondrial or nucleolar morphology, respectively, hinting at their importance for these organelles. To start elucidating the underlying mechanisms, we have mapped their interactomes using BioID. The cellular localisation of interactors supports the mitochondrial, nucleolar and stress granule localisation of MACROD1 and TARG1, respectively. Gene ontology analysis suggests an involvement of MACROD1 and TARG1 in RNA metabolism in their respective compartments. The detailed description of the hydrolases’ expression, localisation and interactome presented here provides a solid basis for future work addressing their physiological function in more detail.
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Affiliation(s)
- R Žaja
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074, Aachen, Germany.
| | - G Aydin
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074, Aachen, Germany
| | - B E Lippok
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074, Aachen, Germany
| | - R Feederle
- Monoclonal Antibody Core Facility, Institute for Diabetes and Obesity, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - B Lüscher
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074, Aachen, Germany
| | - K L H Feijs
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Pauwelsstrasse 30, 52074, Aachen, Germany.
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Affinity Purification of NF1 Protein-Protein Interactors Identifies Keratins and Neurofibromin Itself as Binding Partners. Genes (Basel) 2019; 10:genes10090650. [PMID: 31466283 PMCID: PMC6770187 DOI: 10.3390/genes10090650] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 08/09/2019] [Accepted: 08/19/2019] [Indexed: 12/23/2022] Open
Abstract
Neurofibromatosis Type 1 (NF1) is caused by pathogenic variants in the NF1 gene encoding neurofibromin. Definition of NF1 protein–protein interactions (PPIs) has been difficult and lacks replication, making it challenging to define binding partners that modulate its function. We created a novel tandem affinity purification (TAP) tag cloned in frame to the 3’ end of the full-length murine Nf1 cDNA (mNf1). We show that this cDNA is functional and expresses neurofibromin, His-Tag, and can correct p-ERK/ERK ratios in NF1 null HEK293 cells. We used this affinity tag to purify binding partners with Strep-Tactin®XT beads and subsequently, identified them via mass spectrometry (MS). We found the tagged mNf1 can affinity purify human neurofibromin and vice versa, indicating that neurofibromin oligomerizes. We identify 21 additional proteins with high confidence of interaction with neurofibromin. After Metacore network analysis of these 21 proteins, eight appear within the same network, primarily keratins regulated by estrogen receptors. Previously, we have shown that neurofibromin levels negatively regulate keratin expression. Here, we show through pharmacological inhibition that this is independent of Ras signaling, as the inhibitors, selumetinib and rapamycin, do not alter keratin expression. Further characterization of neurofibromin oligomerization and binding partners could aid in discovering new neurofibromin functions outside of Ras regulation, leading to novel drug targets.
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Cheng Y, Qin K, Huang N, Zhou Z, Xiong H, Zhao J, Zhang Y, Yu S. Cytokeratin 18 regulates the transcription and alternative splicing of apoptotic‑related genes and pathways in HeLa cells. Oncol Rep 2019; 42:301-312. [PMID: 31115582 PMCID: PMC6549092 DOI: 10.3892/or.2019.7166] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 05/13/2019] [Indexed: 02/07/2023] Open
Abstract
Cytokeratin 18 (CK18), one of the major components of intermediate filaments (IF) in simple epithelial cells, undergoes caspase-mediated cleavage upon epithelial cell necrosis and apoptosis. CK18 has been used as a biomarker of several cancers and has been reported to be dysregulated in cervical cancers. The effects of dysregulated expression of CK18 at a molecular level are, however, unclear. In the present study, the function of CK18 in HeLa cells, a cell line derived from a cervical cancer cells, was investigated using shRNA knockdown. Reduced levels of CK18 led to a significant decrease in cell apoptosis, compared with control cells. Notably, RNA-seq analysis of the transcriptomes of HeLa cells, with or without CK18 knockdown, revealed that genes in the NF-κB pathway, and certain apoptosis pathways, were under global transcriptional and alternative splicing regulation. Quantitative RT-PCR confirmed the CK18-regulated transcription of apoptotic genes FAS and FADD, as well as immune genes CXCL2 and CD79B, in addition to alternative splicing of FAS and CTNNB1. Western blot analysis further revealed that CK18 knockdown led to reduced expression of CASP8. In conclusion, the present study indicated that CK18 played a role in apoptosis, which may be mediated via a feed-back regulation loop and may involve regulation of transcription and alternative splicing of a number of genes in apoptotic pathways.
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Affiliation(s)
- Yi Cheng
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Kai Qin
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Nan Huang
- Department of Allergy, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Zhipeng Zhou
- Laboratory for Genome Regulation and Human Health, ABLife, Inc., Optics Valley International Biomedical Park, East Lake High‑Tech Development Zone, Wuhan, Hubei 430075, P.R. China
| | - Huihua Xiong
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Jing Zhao
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Yi Zhang
- Laboratory for Genome Regulation and Human Health, ABLife, Inc., Optics Valley International Biomedical Park, East Lake High‑Tech Development Zone, Wuhan, Hubei 430075, P.R. China
| | - Shiying Yu
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
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Shao L, Jing W, Wang L, Pan F, Wu L, Zhang L, Yang P, Hu M, Fan K. LRP16 prevents hepatocellular carcinoma progression through regulation of Wnt/β-catenin signaling. J Mol Med (Berl) 2018; 96:547-558. [PMID: 29748698 DOI: 10.1007/s00109-018-1639-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 03/18/2018] [Accepted: 04/11/2018] [Indexed: 02/07/2023]
Abstract
UNLABELLED Elevated LRP16 expression is associated with poor clinical outcomes in multiple malignancies. We detected LRP16 expression in hepatocellular carcinoma (HCC) and found that it was downregulated in tumor samples and HCC cell lines. In a cohort of 80 HCC patients, high level of LRP16 expression in HCC tumors was associated with well differentiation, less lymph node metastasis, and good overall survival (OS). Overexpression of LRP16 in the HepG2 and MHCC-97L cell lines increased cell apoptosis, attenuated cell proliferation, migration, and invasion ability in vitro, and drastically diminished tumor growth and metastasis in vivo. Silencing LRP16 in HCC-LM3 and SMMC-7721 cell lines showed opposite results. Microarray evaluation of tumor cells overexpressing LRP16 revealed the effects on decreased activity in the Wnt signaling pathway. These results were confirmed by qRT-PCR and Western blots. Furthermore, inhibition of Wnt signaling decreased proliferation, migration, and invasion of HCC cell lines. Mechanism conducted showed that LRP16 overexpression could prevent β-catenin from entering the nucleus. Our study demonstrated that LRP16 suppresses tumor growth in HCC by modulating Wnt/β-catenin signaling. KEY MESSAGES LRP16 was low expression in HCC tissue and cell lines. Low expression of LRP16 in HCC was associated with poor prognosis. LRP16 inhibits activation of the Wnt/β-catenin pathway in HCC. LRP16 prevents β-catenin from entering the nucleus.
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Affiliation(s)
- Lijuan Shao
- Department of Immunology, School of Medicine, Nankai University, Tianjin, 300071, People's Republic of China
- PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, Beijing, 100001, People's Republic of China
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, People's Republic of China
| | - Wei Jing
- Department of General Surgery, Changhai Hospital, The Second Military Medical University, 800 Xiangyin Road, Shanghai, 200040, People's Republic of China
| | - Lingxiong Wang
- PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, Beijing, 100001, People's Republic of China
| | - Fei Pan
- PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, Beijing, 100001, People's Republic of China
| | - Liangliang Wu
- PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, Beijing, 100001, People's Republic of China
| | - Lijun Zhang
- PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, Beijing, 100001, People's Republic of China
| | - Pan Yang
- Department of Stomatology, the First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, 510080, People's Republic of China
| | - Minggen Hu
- PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, Beijing, 100001, People's Republic of China.
| | - Kexing Fan
- PLA General Hospital Cancer Center, PLA Postgraduate School of Medicine, Beijing, 100001, People's Republic of China.
- International Joint Cancer Institute, The Second Military Medical University, Shanghai, 200433, People's Republic of China.
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The Study on Biological Function of Keratin 26, a Novel Member of Liaoning Cashmere Goat Keratin Gene Family. PLoS One 2016; 11:e0168015. [PMID: 27997570 PMCID: PMC5173340 DOI: 10.1371/journal.pone.0168015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 11/25/2016] [Indexed: 11/29/2022] Open
Abstract
In our research, we explored the relationship between Keratin 26 and the regulation of fine hair, BMP signaling pathway, MT, FGF5, and IGF-I. The result of hybridization in situ revealed that Keratin 26 was specially expressed in cortex of skin hair follicles; the result of immunohistochemistry indicated that Keratin 26 was expressed in internal root sheath, external root sheath. Then, Real-time quantitative PCR results showed that relative expressive quantity of Keratin 26 was 1.08 or 3.3 × greater in secondary follicle than primary follicle during anagen or catagen; the difference during anagen was not remarkable (p>0.05), however, that of catagen was extremely significant (p<0.01). Relative expressive quantity of Keratin 26 increased during telogen; the difference was extremely significant (p<0.01). Moreover, after Noggin expression interference using RNAi technology, we found that relative expressive quantity of Keratin 26 extremely remarkably declined (p<0.01); after K26 overexpression, we found that relative expressive quantity of Noggin extremely remarkably increased (p<0.01). We detected expressive quantity change of Keratin 26 and Keratin 26 using Real-time quantitative PCR and immunofluorescence technologies after fibroblasts were treated with MT, FGF5 or IGF-I; the results indicated that MT and FGF5 played a positive role in Keratin 26 and Keratin 26 expression, IGF-I played a negative role in Keratin 26 expression, positive role in Keratin 26 expression. The results above showed that Keratin 26 could inhibit cashmere growth, and was related to entering to catagen and telogen of hair follicles; Keratin 26 and BMP signaling pathway were two antagonistic pathways each other which could inhibit growth and development of cashmere; MT, FGF5 and IGF-I could affect expression of Keratin 26 and Keratin 26, and Keratin 26 was one of the important pathways that MT induced cashmere production in advance, FGF5 regulated cashmere growth and IGF-I promoted cashmere growth and development.
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Salas PJ, Forteza R, Mashukova A. Multiple roles for keratin intermediate filaments in the regulation of epithelial barrier function and apico-basal polarity. Tissue Barriers 2016; 4:e1178368. [PMID: 27583190 PMCID: PMC4993576 DOI: 10.1080/21688370.2016.1178368] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 04/05/2016] [Accepted: 04/07/2016] [Indexed: 12/27/2022] Open
Abstract
As multicellular organisms evolved a family of cytoskeletal proteins, the keratins (types I and II) expressed in epithelial cells diversified in more than 20 genes in vertebrates. There is no question that keratin filaments confer mechanical stiffness to cells. However, such a number of genes can hardly be explained by evolutionary advantages in mechanical features. The use of transgenic mouse models has revealed unexpected functional relationships between keratin intermediate filaments and intracellular signaling. Accordingly, loss of keratins or mutations in keratins that cause or predispose to human diseases, result in increased sensitivity to apoptosis, regulation of innate immunity, permeabilization of tight junctions, and mistargeting of apical proteins in different epithelia. Precise mechanistic explanations for these phenomena are still lacking. However, immobilization of membrane or cytoplasmic proteins, including chaperones, on intermediate filaments (“scaffolding”) appear as common molecular mechanisms and may explain the need for so many different keratin genes in vertebrates.
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Affiliation(s)
- Pedro J Salas
- Department of Cell Biology, Miller School of Medicine, University of Miami , Miami, FL, USA
| | - Radia Forteza
- Department of Cell Biology, Miller School of Medicine, University of Miami , Miami, FL, USA
| | - Anastasia Mashukova
- Department of Cell Biology, Miller School of Medicine, University of Miami, Miami, FL, USA; Department of Physiology, Nova Southeastern University, Fort Lauderdale, FL, USA
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PAVLIKOVA NELA, BARTONOVA IRENA, DINCAKOVA LUCIA, HALADA PETR, KOVAR JAN. Differentially expressed proteins in human breast cancer cells sensitive and resistant to paclitaxel. Int J Oncol 2014; 45:822-30. [DOI: 10.3892/ijo.2014.2484] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 04/11/2014] [Indexed: 11/05/2022] Open
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Rieber M, Strasberg-Rieber M. p53 inactivation decreases dependence on estrogen/ERK signalling for proliferation but promotes EMT and susceptility to 3-bromopyruvate in ERα+ breast cancer MCF-7 cells. Biochem Pharmacol 2014; 88:169-77. [PMID: 24486524 DOI: 10.1016/j.bcp.2014.01.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 01/08/2014] [Accepted: 01/17/2014] [Indexed: 01/18/2023]
Abstract
BACKGROUND Most breast cancers express the estrogen receptor alpha (ERα(+)), harbor wt TP53, depend on estrogen/ERK signalling for proliferation, and respond to anti-estrogens. However, concomittant activation of the epidermal growth factor receptor (EGFR)/MEK pathway promotes resistance by decreasing estrogen dependence. Previously, we showed that retroviral transduction of mutant p53 R175H into wt TP53 ERα(+) MCF-7 cells induces epidermal growth factor (EGF)-independent proliferation, activation of the EGF receptor (p-EGFR) and some characteristics of epithelial-mesenchymal transition (EMT). PURPOSE To investigate whether p53 inactivation augments ERα(+) cell proliferation in response to restrictive estradiol, chemical MEK inhibition or metabolic inhibitors. RESULTS Introduction of mutant p53 R175H lowered expression of p53-dependent PUMA and p21WAF1, decreased E-cadherin and cytokeratin 18 associated with EMT, but increased the % of proliferating ERα(+)/Ki67 cells, diminishing estrogen dependence. These cells also exhibited higher proliferation in the presence of MEK-inhibitor UO126, reciprocally correlating with preferential susceptibility to the pyruvate analog 3-bromopyruvate (3-BrPA) without a comparable response to 2-deoxyglucose. p53 siRNA silencing by electroporation in wt TP53 MCF-7 cells also decreased estrogen dependence and response to MEK inhibition, while also conferring susceptibility to 3-BrPA. CONCLUSIONS (a) ERα(+) breast cancer cells dysfunctional for TP53 which proliferate irrespective of low estrogen and chemical MEK inhibition are likely to increase metabolic consumption becoming increasingly susceptible to 3-BrPA; (b) targeting the pyruvate pathway may improve response to endocrine therapy in ERα(+) breast cancer with p53 dysfunction.
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Affiliation(s)
- Manuel Rieber
- IVIC, Tumor Cell Biology Laboratory, Center for Microbiology & Cell Biology Apartado 21827, Caracas 1020 A, Venezuela.
| | - Mary Strasberg-Rieber
- IVIC, Tumor Cell Biology Laboratory, Center for Microbiology & Cell Biology Apartado 21827, Caracas 1020 A, Venezuela.
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Usefulness of traditional serum biomarkers for management of breast cancer patients. BIOMED RESEARCH INTERNATIONAL 2013; 2013:685641. [PMID: 24350285 PMCID: PMC3856124 DOI: 10.1155/2013/685641] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 09/06/2013] [Accepted: 09/09/2013] [Indexed: 12/30/2022]
Abstract
The measurement of serum tumor markers levels in breast cancer (BC) patients is an economic and noninvasive diagnostic assay frequently requested by clinical oncologists to get information about the presence or absence of disease as well as its evolution. Despite their wide use in clinical practice, there is still an intense debate between scientific organizations about the real usefulness for patient monitoring during followup as well as response to therapy evaluation in case of advanced BC. In this review, we want to highlight the current recommendations published by scientific organizations about the use of “established” BC serum markers (CEA, TPA, TPS, CIFRA-21, CA15-3, and s-HER2) in clinical oncology practice. Moreover, we will focus on recent papers evidencing the usefulness of tumor markers levels measurement as a guide for the prescription and diagnostic integration of molecular imaging exams such as those performed by hybrid 18-fluorofeoxyglucose-positron emission tomography with integrated computed tomography. This technology is nowadays able to detect early cancer lesions undetectable by conventional morphological imaging investigation and most likely responsible for increasing of serum tumor markers levels.
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14
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Li GP, Wang H, Lai YK, Chen SC, Lin MCM, Lu G, Zhang JF, He XG, Qian CN, Kung HF. Proteomic profiling between CNE-2 and its strongly metastatic subclone S-18 and functional characterization of HSP27 in metastasis of nasopharyngeal carcinoma. Proteomics 2011; 11:2911-20. [DOI: 10.1002/pmic.201000483] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Abstract
Keratins are the intermediate filament (IF)-forming proteins of epithelial cells. Since their initial characterization almost 30 years ago, the total number of mammalian keratins has increased to 54, including 28 type I and 26 type II keratins. Keratins are obligate heteropolymers and, similarly to other IFs, they contain a dimeric central α-helical rod domain that is flanked by non-helical head and tail domains. The 10-nm keratin filaments participate in the formation of a proteinaceous structural framework within the cellular cytoplasm and, as such, serve an important role in epithelial cell protection from mechanical and non-mechanical stressors, a property extensively substantiated by the discovery of human keratin mutations predisposing to tissue-specific injury and by studies in keratin knockout and transgenic mice. More recently, keratins have also been recognized as regulators of other cellular properties and functions, including apico-basal polarization, motility, cell size, protein synthesis and membrane traffic and signaling. In cancer, keratins are extensively used as diagnostic tumor markers, as epithelial malignancies largely maintain the specific keratin patterns associated with their respective cells of origin, and, in many occasions, full-length or cleaved keratin expression (or lack there of) in tumors and/or peripheral blood carries prognostic significance for cancer patients. Quite intriguingly, several studies have provided evidence for active keratin involvement in cancer cell invasion and metastasis, as well as in treatment responsiveness, and have set the foundation for further exploration of the role of keratins as multifunctional regulators of epithelial tumorigenesis.
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Affiliation(s)
- V Karantza
- Department of Medicine, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway, NJ, USA.
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