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Zupančič D, Romih R. Immunohistochemistry as a paramount tool in research of normal urothelium, bladder cancer and bladder pain syndrome. Eur J Histochem 2021; 65. [PMID: 33764020 PMCID: PMC8033529 DOI: 10.4081/ejh.2021.3242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 03/19/2021] [Indexed: 12/14/2022] Open
Abstract
The urothelium, an epithelium of the urinary bladder, primarily functions as blood-urine permeability barrier. The urothelium has a very slow turnover under normal conditions but is capable of extremely fast response to injury. During regeneration urothelium either restores normal function or undergoes altered differentiation pathways, the latter being the cause of several bladder diseases. In this review, we describe the structure of the apical plasma membrane that enables barrier function, the role of urothelium specific proteins uroplakins and the machinery for polarized membrane transports in terminally differentiated superficial umbrella cells. We address key markers, such as keratins, cancer stem cell markers, retinoic acid signalling pathway proteins and transient receptor potential channels and purinergic receptors that drive normal and altered differentiation in bladder cancer and bladder pain syndrome. Finally, we discuss uncertainties regarding research, diagnosis and treatment of bladder pain syndrome. Throughout the review, we emphasise the contribution of immunohistochemistry in advancing our understanding of processes in normal and diseased bladder as well as the most promising possibilities for improved bladder cancer and bladder pain syndrome management.
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Affiliation(s)
- Daša Zupančič
- Institute of Cell Biology, Faculty of Medicine, University of Ljubljana.
| | - Rok Romih
- Institute of Cell Biology, Faculty of Medicine, University of Ljubljana.
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Vitamin A Rich Diet Diminishes Early Urothelial Carcinogenesis by Altering Retinoic Acid Signaling. Cancers (Basel) 2020; 12:cancers12071712. [PMID: 32605249 PMCID: PMC7407197 DOI: 10.3390/cancers12071712] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 06/17/2020] [Accepted: 06/18/2020] [Indexed: 12/24/2022] Open
Abstract
Urinary bladder cancer is one of the leading malignancies worldwide, with the highest recurrence rates. A diet rich in vitamin A has proven to lower the risk of cancer, yet the molecular mechanisms underlying this effect are unknown. We found that vitamin A decreased urothelial atypia and apoptosis during early bladder carcinogenesis induced by N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN). Vitamin A did not alter urothelial cell desquamation, differentiation, or proliferation rate. Genes like Wnt5a, involved in retinoic acid signaling, and transcription factors Pparg, Ppara, Rxra, and Hoxa5 were downregulated, while Sox9 and Stra6 were upregulated in early urothelial carcinogenesis. When a vitamin A rich diet was provided during BBN treatment, none of these genes was up- or downregulated; only Lrat and Neurod1 were upregulated. The lecithin retinol acyltransferase (LRAT) enzyme that produces all-trans retinyl esters was translocated from the cytoplasm to the nuclei in urothelial cells as a consequence of BBN treatment regardless of vitamin A rich diet. A vitamin A-rich diet altered retinoic acid signaling, decreased atypia and apoptosis of urothelial cells, and consequently diminished early urothelial carcinogenesis.
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Wei H, Wang L, Ren X, Yu W, Lin J, Jin C, Xia B. Structural and functional characterization of tumor suppressors TIG3 and H-REV107. FEBS Lett 2015; 589:1179-86. [PMID: 25871522 DOI: 10.1016/j.febslet.2015.04.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 03/16/2015] [Accepted: 04/01/2015] [Indexed: 11/30/2022]
Abstract
H-REV107-like family proteins TIG3 and H-REV107 are class II tumor suppressors. Here we report that the C-terminal domains (CTDs) of TIG3 and H-REV107 can induce HeLa cell death independently. The N-terminal domain (NTD) of TIG3 enhances the cell death inducing ability of CTD, while NTD of H-REV107 plays an inhibitory role. The solution structure of TIG3 NTD is very similar to that of H-REV107 in overall fold. However, the CTD binding regions on NTD are different between TIG3 and H-REV107, which may explain their functional difference. As a result, the flexible main loop of H-REV107, but not that of TIG3, is critical for its NTD to modulate its CTD in inducing cell death.
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Affiliation(s)
- Hejia Wei
- Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China; School of Life Sciences, Peking University, Beijing 100871, China
| | - Lei Wang
- Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China; College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xiaobai Ren
- Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China; College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Wenyu Yu
- Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China; School of Life Sciences, Peking University, Beijing 100871, China
| | - Jian Lin
- Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China; College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Changwen Jin
- Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China; School of Life Sciences, Peking University, Beijing 100871, China; College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Bin Xia
- Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China; School of Life Sciences, Peking University, Beijing 100871, China; College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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Hassel JC, Amann PM, Schadendorf D, Eichmüller SB, Nagler M, Bazhin AV. Lecithin retinol acyltransferase as a potential prognostic marker for malignant melanoma. Exp Dermatol 2014; 22:757-9. [PMID: 24433184 DOI: 10.1111/exd.12236] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/02/2013] [Indexed: 12/24/2022]
Abstract
Metabolism inside cells differs between cancer and normal cells. Because disturbance of vitamin A metabolism might be important, we investigated expression of the enzymes lecithin retinol acyltransferase (LRAT) and RPE65 by immunohistochemistry in melanoma metastases and melanocytic nevi. Semiquantitative evaluation of this expression revealed downregulated expression of RPE65 in malignant melanoma compared with benign melanocytic nevi (P < 0.001). In contrast, expression of LRAT was not significantly different (P = 0.339). High LRAT expression in melanoma metastases was inversely correlated with patient survival; Kaplan-Meier analysis revealed earlier melanoma-related death (P = 0.003). Expression of LRAT might, therefore, be a prognostic marker of the clinical course of melanoma.
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Affiliation(s)
- Jessica C Hassel
- Skin Cancer Unit, German Cancer Research Centre (DKFZ), Heidelberg, Germany; Department of Dermatology, University Hospital Heidelberg, Heidelberg, Germany
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RAGE overexpression confers a metastatic phenotype to the WM115 human primary melanoma cell line. Biochim Biophys Acta Mol Basis Dis 2014; 1842:1017-27. [DOI: 10.1016/j.bbadis.2014.02.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 02/16/2014] [Accepted: 02/26/2014] [Indexed: 12/19/2022]
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Scharadin TM, Eckert RL. TIG3: an important regulator of keratinocyte proliferation and survival. J Invest Dermatol 2014; 134:1811-1816. [PMID: 24599174 PMCID: PMC4057967 DOI: 10.1038/jid.2014.79] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Revised: 12/11/2013] [Accepted: 01/16/2014] [Indexed: 01/12/2023]
Abstract
Tazarotene induced gene 3 (TIG3) is a tumor suppressor protein. In normal human epidermis, TIG3 is present in the differentiated, suprabasal layers and regulates terminal differentiation. TIG3 level is reduced in hyperproliferative diseases, including psoriasis and skin cancer, suggesting that loss of TIG3 is associated with enhanced cell proliferation. Moreover, transient expression of TIG3 leads to terminal differentiation in normal keratinocytes and apoptosis in skin cancer cells. In both cell types, TIG3 distributes to the cell membrane and to the centrosome. At the cell membrane, TIG3 interacts with and activates type I transglutaminase (TG1) to enhance keratinocyte terminal differentiation. TIG3 at the centrosome acts to inhibit centrosome separation during mitosis and to alter microtubule function. These findings argue that TIG3 is involved in control of keratinocyte differentiation and that loss of TIG3 in transformed cells contributes to the malignant phenotype.
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Affiliation(s)
- Tiffany M Scharadin
- Departments of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Richard L Eckert
- Departments of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland, USA; Department of Dermatology, University of Maryland School of Medicine, Baltimore, Maryland, USA; Departments of Obstetrics and Gynecology and Reproductive Sciences, University of Maryland School of Medicine, Baltimore, Maryland, USA; Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, Maryland, USA.
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REVILL KATE, WANG TIM, LACHENMAYER ANJA, KOJIMA KENSUKE, HARRINGTON ANDREW, LI JINYU, HOSHIDA YUJIN, LLOVET JOSEPM, POWERS SCOTT. Genome-wide methylation analysis and epigenetic unmasking identify tumor suppressor genes in hepatocellular carcinoma. Gastroenterology 2013; 145:1424-35.e1-25. [PMID: 24012984 PMCID: PMC3892430 DOI: 10.1053/j.gastro.2013.08.055] [Citation(s) in RCA: 162] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 07/30/2013] [Accepted: 08/29/2013] [Indexed: 02/08/2023]
Abstract
BACKGROUND & AIMS Epigenetic silencing of tumor suppressor genes contributes to the pathogenesis of hepatocellular carcinoma (HCC). To identify clinically relevant tumor suppressor genes silenced by DNA methylation in HCC, we integrated DNA methylation data from human primary HCC samples with data on up-regulation of gene expression after epigenetic unmasking. METHODS We performed genome-wide methylation analysis of 71 human HCC samples using the Illumina HumanBeadchip27K array; data were combined with those from microarray analysis of gene re-expression in 4 liver cancer cell lines after their exposure to reagents that reverse DNA methylation (epigenetic unmasking). RESULTS Based on DNA methylation in primary HCC and gene re-expression in cell lines after epigenetic unmasking, we identified 13 candidate tumor suppressor genes. Subsequent validation led us to focus on functionally characterizing 2 candidates, sphingomyelin phosphodiesterase 3 (SMPD3) and neurofilament, heavy polypeptide (NEFH), which we found to behave as tumor suppressor genes in HCC. Overexpression of SMPD3 and NEFH by stable transfection of inducible constructs into an HCC cell line reduced cell proliferation by 50% and 20%, respectively (SMPD3, P = .003 and NEFH, P = .003). Conversely, knocking down expression of these genes with small hairpin RNA promoted cell invasion and migration in vitro (SMPD3, P = .0001 and NEFH, P = .022), and increased their ability to form tumors after subcutaneous injection or orthotopic transplantation into mice, confirming their role as tumor suppressor genes in HCC. Low levels of SMPD3 were associated with early recurrence of HCC after curative surgery in an independent patient cohort (P = .001; hazard ratio = 3.22; 95% confidence interval: 1.6-6.5 in multivariate analysis). CONCLUSIONS Integrative genomic analysis identified SMPD3 and NEFH as tumor suppressor genes in HCC. We provide evidence that SMPD3 is a potent tumor suppressor gene that could affect tumor aggressiveness; a reduced level of SMPD3 is an independent prognostic factor for early recurrence of HCC.
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Affiliation(s)
- KATE REVILL
- Cancer Genome Center, Cold Spring Harbor Laboratory, Woodbury, New York,Mount Sinai Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - TIM WANG
- Cancer Genome Center, Cold Spring Harbor Laboratory, Woodbury, New York,Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - ANJA LACHENMAYER
- Mount Sinai Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York,Department of General, Visceral, and Pediatric Surgery, University Hospital Düsseldorf, Düsseldorf, Germany
| | - KENSUKE KOJIMA
- Mount Sinai Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - ANDREW HARRINGTON
- Mount Sinai Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - JINYU LI
- Cancer Genome Center, Cold Spring Harbor Laboratory, Woodbury, New York
| | - YUJIN HOSHIDA
- Mount Sinai Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - JOSEP M. LLOVET
- Mount Sinai Liver Cancer Program, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York,HCC Translational Research Laboratory, Barcelona-Clinic Liver Cancer Group, Institut d’Investigacions Biomediques August Pi I Sunyer (IDIBAPS), CIBERehd, Liver Unit, Hospital Clinic, University of Barcelona, Catalonia, Spain,Institucio Catalana de Recerca i Estudis Avancats (ICREA), Catalonia, Spain
| | - SCOTT POWERS
- Cancer Genome Center, Cold Spring Harbor Laboratory, Woodbury, New York
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Shyu RY, Wu CC, Wang CH, Tsai TC, Wang LK, Chen ML, Jiang SY, Tsai FM. H-rev107 regulates prostaglandin D2 synthase-mediated suppression of cellular invasion in testicular cancer cells. J Biomed Sci 2013; 20:30. [PMID: 23687991 PMCID: PMC3669107 DOI: 10.1186/1423-0127-20-30] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Accepted: 05/15/2013] [Indexed: 01/08/2023] Open
Abstract
Background H-rev107 is a member of the HREV107 type II tumor suppressor gene family which includes H-REV107, RIG1, and HRASLS. H-REV107 has been shown to express at high levels in differentiated tissues of post-meiotic testicular germ cells. Prostaglandin D2 (PGD2) is conjectured to induce SRY-related high-mobility group box 9 (SOX9) expression and subsequent Sertoli cell differentiation. To date, the function of H-rev107 in differentiated testicular cells has not been well defined. Results In the study, we found that H-rev107 was co-localized with prostaglandin D2 synthase (PTGDS) and enhanced the activity of PTGDS, resulting in increase of PGD2 production in testis cells. Furthermore, when H-rev107 was expressed in human NT2/D1 testicular cancer cells, cell migration and invasion were inhibited. Also, silencing of PTGDS would reduce H-rev107-mediated increase in PGD2, cAMP, and SOX9. Silencing of PTGDS or SOX9 also alleviated H-rev107-mediated suppression of cell migration and invasion. Conclusions These results revealed that H-rev107, through PTGDS, suppressed cell migration and invasion. Our data suggest that the PGD2-cAMP-SOX9 signal pathway might play an important role in H-rev107-mediated cancer cell invasion in testes.
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Affiliation(s)
- Rong-Yaun Shyu
- Department of Internal Medicine, Buddhist Tzu Chi General Hospital Taipei Branch, New Taipei City, Taiwan
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Amann PM, Luo C, Owen RW, Hofmann C, Freudenberger M, Schadendorf D, Eichmüller SB, Bazhin AV. Vitamin A metabolism in benign and malignant melanocytic skin cells: importance of lecithin/retinol acyltransferase and RPE65. J Cell Physiol 2012; 227:718-28. [PMID: 21465477 DOI: 10.1002/jcp.22779] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Disturbance in vitamin A metabolism seems to be an important attribute of cancer cells. Retinoids, particularly retinoic acid, have critical regulatory functions and appear to modulate tumor development and progression. The key step of vitamin A metabolism is the esterification of all-trans retinol, catalyzed by lecithin/retinol acyltransferase (LRAT). In this work, we show that malignant melanoma cells are able to esterify all-trans retinol and subsequently isomerize all-trans retinyl esters (RE) into 11-cis retinol, whereas their benign counterparts-melanocytes are not able to catalyze these reactions. Besides, melanoma cell lines express lecithin/retinol acyltranseferase both at the mRNA and protein levels. In contrast, melanocytes do not express this enzyme at the protein level, but mRNA of lecithin/retinol acyltransefrase could still be present at mRNA level. RPE65 is expressed in both melanocytic counterparts, and could be involved in the subsequent isomerization of RE produced by lecithin/retinol acyltransefrase to 11-cis retinol. Cellular retinol-binding protein 2 does not appear to be involved in the regulation of all-trans retinol esterification in these cells. Expression of LRAT and RPE65 can be modulated by retinoids. We propose that the post-transcriptional regulation of lecithin/retinol acyltransefrase could be involved in the differential expression of this enzyme. Besides, activities of LRAT and RPE65 may be important for removal of all-trans retinal which is the substrate for retinoic acid production in skin cells. Consequently, the decreasing cellular amount of retinoic acid and its precursor molecules could result in a change of gene regulation.
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Affiliation(s)
- Philipp M Amann
- Skin Cancer Unit, German Cancer Research Center, Heidelberg, Germany
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Scharadin TM, Jiang H, Jans R, Rorke EA, Eckert RL. TIG3 tumor suppressor-dependent organelle redistribution and apoptosis in skin cancer cells. PLoS One 2011; 6:e23230. [PMID: 21858038 PMCID: PMC3157364 DOI: 10.1371/journal.pone.0023230] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Accepted: 07/12/2011] [Indexed: 12/31/2022] Open
Abstract
TIG3 is a tumor suppressor protein that limits keratinocyte survival during normal differentiation. It is also important in cancer, as TIG3 level is reduced in tumors and in skin cancer cell lines, suggesting that loss of expression may be required for cancer cell survival. An important goal is identifying how TIG3 limits cell survival. In the present study we show that TIG3 expression in epidermal squamous cell carcinoma SCC-13 cells reduces cell proliferation and promotes morphological and biochemical apoptosis. To identify the mechanism that drives these changes, we demonstrate that TIG3 localizes near the centrosome and that pericentrosomal accumulation of TIG3 alters microtubule and microfilament organization and organelle distribution. Organelle accumulation at the centrosome is a hallmark of apoptosis and we demonstrate that TIG3 promotes pericentrosomal organelle accumulation. These changes are associated with reduced cyclin D1, cyclin E and cyclin A, and increased p21 level. In addition, Bax level is increased and Bcl-XL level is reduced, and cleavage of procaspase 3, procaspase 9 and PARP is enhanced. We propose that pericentrosomal localization of TIG3 is a key event that results in microtubule and microfilament redistribution and pericentrosomal organelle clustering and that leads to cancer cell apoptosis.
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Affiliation(s)
- Tiffany M. Scharadin
- Department of Biochemistry and Molecular Biology, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
| | - Haibing Jiang
- Department of Biochemistry and Molecular Biology, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
| | - Ralph Jans
- Department of Biochemistry and Molecular Biology, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
| | - Ellen A. Rorke
- Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
| | - Richard L. Eckert
- Department of Biochemistry and Molecular Biology, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
- Department of Dermatology, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
- Department of Obstetrics and Gynecology and Reproductive Sciences, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
- * E-mail:
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Tsai FM, Shyu RY, Lin SC, Wu CC, Jiang SY. Induction of apoptosis by the retinoid inducible growth regulator RIG1 depends on the NC motif in HtTA cervical cancer cells. BMC Cell Biol 2009; 10:15. [PMID: 19245694 PMCID: PMC2656461 DOI: 10.1186/1471-2121-10-15] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2008] [Accepted: 02/26/2009] [Indexed: 02/06/2023] Open
Abstract
Background Retinoid-inducible gene 1 (RIG1), also known as tazarotene-induced gene 3 or retinoic-acid receptor responder 3, is a growth regulator, which induces apoptosis and differentiation. RIG1 is classified into the NC protein family. This study investigated functional domains and critical amino acids associated with RIG1-mediated cell death and apoptosis. Results Using enhanced green fluorescence protein (EGFP)-tagged RIG1 variants, RIG1 proteins with deletion at the NC domain significantly decreased cell death induced by RIG1, and fusion variants containing only the NC domain significantly induced apoptosis of HtTA cervical cancer cells. The EGFP-RIG1-induced apoptosis was significantly decreased in cells expressing N112C113 motif double- (NC→FG) or triple- (NCR→FGE) mutated RIG1 variants. Using dodecapeptides, nuclear localization and profound cell death was observed in HtTA cells expressing wild type RIG1111–123 or Leu121-mutated RIG1111–123:L→ C peptide, but peptides double- or triple-mutated at the NC motif alone, RIG1111–123:NC→FG or RIG1111–123:NCR→FGE, were cytoplasmically localized and did not induce apoptosis. The RIG1111–123 also induced apoptosis of A2058 melanoma cells but not normal human fibroblasts. Conclusion The NC domain, especially the NC motif, plays the major role in RIG1-mediated pro-apoptotic activity. The RIG1111–123 dodecapeptide exhibited strong pro-apoptotic activity and has potential as an anticancer drug.
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Affiliation(s)
- Fu-Ming Tsai
- Department of Research, Buddhist Tzu Chi General Hospital Taipei Branch, Taipei county 231, Taiwan, Republic of China.
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Nagatsuma K, Hayashi Y, Hano H, Sagara H, Murakami K, Saito M, Masaki T, Lu T, Tanaka M, Enzan H, Aizawa Y, Tajiri H, Matsuura T. Lecithin: retinol acyltransferase protein is distributed in both hepatic stellate cells and endothelial cells of normal rodent and human liver. Liver Int 2009; 29:47-54. [PMID: 18544127 DOI: 10.1111/j.1478-3231.2008.01773.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
BACKGROUND To determine the extent to which hepatic stellate cell (HSC) activation contributes to liver fibrosis, it was found necessary to develop an alternative structural and functional stellate cell marker for in situ studies. Although several HSC markers have been reported, none of those are associated with particular HSC functions. AIM The present study was undertaken to examine whether lecithin:retinol acyltransferase (LRAT), the physiological retinol esterification enzyme of the liver, is a potential and relevant tissue marker for HSC. METHODS An antibody specific to mouse and human LRAT was prepared based on the amino acid sequences. Antibodies to LRAT were used for immunohistochemical studies to assess the distribution of LRAT-positive cells in the liver with the aid of fluorescence and immunogold electron microscopy. RESULTS LRAT-positive cells were found to be confined in the space of Disse, corresponding with the location of desmin-positive HSC in rodent liver, also in human liver. Interestingly, LRAT-positive staining was also observed along the liver sinusoidal endothelial lining. Furthermore, immune electron microscopic studies revealed that LRAT was mainly distributed in HSC within the rough-endoplasmic reticulum (RER) and multivesicular bodies, whereas LRAT staining within the endothelial cells was largely confined to the perinuclear area and to some extent to the RER. CONCLUSION Evidence has been accumulated that LRAT might serve as an excellent alternative HSC marker for future structural and functional studies. Furthermore, the presence of LRAT in endothelial cells might suggest a currently unknown function of this enzyme in liver endothelial biology.
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Affiliation(s)
- Keisuke Nagatsuma
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, The Jikei University School of Medicine, Tokyo, Japan
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Shyu RY, Hsieh YC, Tsai FM, Wu CC, Jiang SY. Cloning and functional characterization of the HRASLS2 gene. Amino Acids 2007; 35:129-37. [DOI: 10.1007/s00726-007-0612-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2007] [Accepted: 09/06/2007] [Indexed: 10/22/2022]
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Wu SN, Wang YJ, Lin MW. Potent stimulation of large-conductance Ca2+-activated K+ channels by rottlerin, an inhibitor of protein kinase C-delta, in pituitary tumor (GH3) cells and in cortical neuronal (HCN-1A) cells. J Cell Physiol 2007; 210:655-66. [PMID: 17133362 DOI: 10.1002/jcp.20866] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The effects of rottlerin, a known inhibitor of protein kinase C-delta activation, on ion currents were investigated in pituitary tumor (GH3) cells. Rottlerin (0.3-100 microM) increased the amplitude of Ca2+-activated K+ current (I K(Ca)) in a concentration-dependent manner with an EC50 value of 1.7 microM. In intracellular perfusion with rottlerin (1 microM) or staurosporine (10 microM), phorbol 12-myristate 13-acetate-induced inhibition of I K(Ca) in these cells was abolished. In cell-attached mode, rottlerin applied on the extracellular side of the membrane caused activation of large-conductance Ca2+-activated K+ (BK(Ca)) channels, and a further application of BAPTA-AM (10 microM) to the bath had no effect on rottlerin-stimulated channel activity. When cells were exposed to rottlerin, the activation curve of these channels was shifted to less positive potential with no change in the slope factor. Rottlerin increased BK(Ca)-channel activity in outside-out patches. Its change in kinetic behavior of BK(Ca) channels is primarily due to an increase in mean open time. With the aid of minimal kinetic scheme, a quantitative description of rottlerin stimulation on BK(Ca) channels in GH3 cells was also provided. Under current-clamp configuration, rottlerin (1 microM) decreased the firing of action potentials. I K(Ca) elicited by simulated action potential waveforms was enhanced by this compound. In human cortical HCN-1A cells, rottlerin (1 microM) could also interact with the BK(Ca) channel to stimulate I K(Ca). Therefore, rottlerin may directly activate BK(Ca) channels in neurons or endocrine cells.
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Affiliation(s)
- Sheng-Nan Wu
- Department of Physiology, National Cheng Kung University Medical College, Tainan, Taiwan.
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