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Yan F, Gunay G, Valerio TI, Wang C, Wilson JA, Haddad MS, Watson M, Connell MO, Davidson N, Fung KM, Acar H, Tang Q. Characterization and quantification of necrotic tissues and morphology in multicellular ovarian cancer tumor spheroids using optical coherence tomography. BIOMEDICAL OPTICS EXPRESS 2021; 12:3352-3371. [PMID: 34221665 PMCID: PMC8221959 DOI: 10.1364/boe.425512] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/03/2021] [Accepted: 05/07/2021] [Indexed: 05/02/2023]
Abstract
The three-dimensional (3D) tumor spheroid model is a critical tool for high-throughput ovarian cancer research and anticancer drug development in vitro. However, the 3D structure prevents high-resolution imaging of the inner side of the spheroids. We aim to visualize and characterize 3D morphological and physiological information of the contact multicellular ovarian tumor spheroids growing over time. We intend to further evaluate the distinctive evolutions of the tumor spheroid and necrotic tissue volumes in different cell numbers and determine the most appropriate mathematical model for fitting the growth of tumor spheroids and necrotic tissues. A label-free and noninvasive swept-source optical coherence tomography (SS-OCT) imaging platform was applied to obtain two-dimensional (2D) and 3D morphologies of ovarian tumor spheroids over 18 days. Ovarian tumor spheroids of two different initial cell numbers (5,000- and 50,000- cells) were cultured and imaged (each day) over the time of growth in 18 days. Four mathematical models (Exponential-Linear, Gompertz, logistic, and Boltzmann) were employed to describe the growth kinetics of the tumor spheroids volume and necrotic tissues. Ovarian tumor spheroids have different growth curves with different initial cell numbers and their growths contain different stages with various growth rates over 18 days. The volumes of 50,000-cells spheroids and the corresponding necrotic tissues are larger than that of the 5,000-cells spheroids. The formation of necrotic tissue in 5,000-cells numbers is slower than that in the 50,000-cells ones. Moreover, the Boltzmann model exhibits the best fitting performance for the growth of tumor spheroids and necrotic tissues. Optical coherence tomography (OCT) can serve as a promising imaging modality to visualize and characterize morphological and physiological features of multicellular ovarian tumor spheroids. The Boltzmann model integrating with 3D OCT data of ovarian tumor spheroids provides great potential for high-throughput cancer research in vitro and aiding in drug development.
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Affiliation(s)
- Feng Yan
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
- Equal contribution
| | - Gokhan Gunay
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
- Equal contribution
| | - Trisha I Valerio
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
- Equal contribution
| | - Chen Wang
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
| | - Jayla A Wilson
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
| | - Majood S Haddad
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
| | - Maegan Watson
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
| | - Michael O Connell
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
| | - Noah Davidson
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
| | - Kar-Ming Fung
- Department of Pathology, The University of Oklahoma Health Sciences Center, Oklahoma City 73104, USA
- Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City 73104, USA
| | - Handan Acar
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
- Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City 73104, USA
| | - Qinggong Tang
- Stephenson School of Biomedical Engineering, University of Oklahoma, OK 73019, USA
- Stephenson Cancer Center, The University of Oklahoma Health Sciences Center, Oklahoma City 73104, USA
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Identification of crucial aberrantly methylated and differentially expressed genes related to cervical cancer using an integrated bioinformatics analysis. Biosci Rep 2021; 40:223801. [PMID: 32368784 PMCID: PMC7218222 DOI: 10.1042/bsr20194365] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 04/29/2020] [Accepted: 04/30/2020] [Indexed: 12/24/2022] Open
Abstract
Methylation functions in the pathogenesis of cervical cancer. In the present study, we applied an integrated bioinformatics analysis to identify the aberrantly methylated and differentially expressed genes (DEGS), and their related pathways in cervical cancer. Data of gene expression microarrays (GSE9750) and gene methylation microarrays (GSE46306) were gained from Gene Expression Omnibus (GEO) databases. Hub genes were identified by ‘limma’ packages and Venn diagram tool. Functional analysis was conducted by FunRich. Search Tool for the Retrieval of Interacting Genes Database (STRING) was used to analyze protein–protein interaction (PPI) information. Gene Expression Profiling Interactive Analysis (GEPIA), immunohistochemistry staining, and ROC curve analysis were conducted for validation. Gene Set Enrichment Analysis (GSEA) was also performed to identify potential functions.We retrieved two upregulated-hypomethylated oncogenes and eight downregulated-hypermethylated tumor suppressor genes (TSGs) for functional analysis. Hypomethylated and highly expressed genes (Hypo-HGs) were significantly enriched in cell cycle and autophagy, and hypermethylated and lowly expressed genes (Hyper-LGs) in estrogen receptor pathway and Wnt/β-catenin signaling pathway. Estrogen receptor 1 (ESR1), Erythrocyte membrane protein band 4.1 like 3 (EPB41L3), Endothelin receptor B (EDNRB), Inhibitor of DNA binding 4 (ID4) and placenta-specific 8 (PLAC8) were hub genes. Kaplan–Meier method was used to evaluate survival data of each identified gene. Lower expression levels of ESR1 and EPB41L3 were correlated with a shorter survival time. GSEA results showed that ‘cell adhesion molecules’ was the most enriched item. This research inferred the candidate genes and pathways that might be used in the diagnosis, treatment, and prognosis of cervical cancer.
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Chauhan SR, Singhal PG, Sharma U, Bandil K, Chakraborty K, Bharadwaj M. Th9 cytokines curb cervical cancer progression and immune evasion. Hum Immunol 2019; 80:1020-1025. [PMID: 31563404 DOI: 10.1016/j.humimm.2019.09.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 09/18/2019] [Accepted: 09/22/2019] [Indexed: 01/06/2023]
Abstract
Cervical cancer is one of the most common cancers among women in developing countries. Persistent infection with high-risk human papillomavirus (HPV) is the major determinant for the development of cervical cancer. Role of newly discovered T helper 9 (Th9) cells in cervical cancer pathogenesis is yet unfolded. In this study, we observed a huge infiltration of PU.1+ cells and overrepresentation of IL-9R in tissue biopsy specimens of CIN patients in cervical cancer cases. Treatment with Th9 signatory cytokines, IL-9 and IL-21, suppressed proliferation, enhanced apoptosis and stimulated the expression of MHC I and e-cadherin on HeLa cell lines. Th9 thus seems enhance antitumor immune response through T cell cytotoxicity and play crucial role in a controlling malignant cell transformation. Therefore, this study helps in firmer understanding of relevance of Th9 in cervical cancer immunity.
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Affiliation(s)
- Shilpa Raghuvanshi Chauhan
- Division of Molecular Genetics & Biochemistry, ICMR-National Institute of Cancer Prevention and Research, Noida, India
| | - Pallavi G Singhal
- Division of Molecular Genetics & Biochemistry, ICMR-National Institute of Cancer Prevention and Research, Noida, India
| | - Upma Sharma
- Division of Molecular Genetics & Biochemistry, ICMR-National Institute of Cancer Prevention and Research, Noida, India
| | - Kapil Bandil
- Division of Molecular Genetics & Biochemistry, ICMR-National Institute of Cancer Prevention and Research, Noida, India
| | | | - Mausumi Bharadwaj
- Division of Molecular Genetics & Biochemistry, ICMR-National Institute of Cancer Prevention and Research, Noida, India.
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Abstract
A three-dimensional (3D) tissue model has significant advantages over the conventional two-dimensional (2D) model. A 3D model mimics the relevant in-vivo physiological conditions, allowing a cell culture to serve as an effective tool for drug discovery, tissue engineering, and the investigation of disease pathology. The present reviews highlight the recent advances and the development of microfluidics based methods for the generation of cell spheroids. The paper emphasizes on the application of microfluidic technology for tissue engineering including the formation of multicellular spheroids (MCS). Further, the paper discusses the recent technical advances in the integration of microfluidic devices for MCS-based high-throughput drug screening. The review compares the various microfluidic techniques and finally provides a perspective for the future opportunities in this research area.
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Liang X, Xu X, Wang F, Li N, He J. E-cadherin increasing multidrug resistance protein 1 via hypoxia-inducible factor-1α contributes to multicellular resistance in colorectal cancer. Tumour Biol 2015. [PMID: 26219897 DOI: 10.1007/s13277-015-3811-6] [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] [Indexed: 01/06/2023] Open
Abstract
When cancer cells have been cultured as three-dimensional (3D) cultures or in vivo, they decrease sensitivity to anticancer drugs. This is called multicellular resistance, and the mechanism is not fully understood. Here, we report that E-cadherin increasing multidrug resistance protein 1 (MDR1) via hypoxia-inducible factor-1α (HIF-1α) contributes to multicellular resistance in colorectal cancer. The MDR1 protein level was higher in 3D cultures than in monolayer cells. When dispersed cells from 3D cultures were grown as monolayer cells again, the MDR1 protein level decreased to the similar level of cells maintained as monolayer all through. Knockdown of MDR1 significantly decreased multicellular resistance. Knockdown of E-cadherin decreased MDR1 in 3D cultures but did not detectably change MDR1 in monolayer cells. E-cadherin was expressed uniformly in 3D cultures while the MDR1 protein level was higher in the center of 3D cultures than in the peripheral part. Knockdown of E-cadherin decreased E-cadherin uniformly in 3D cultures but mainly decreased MDR1 at the center of 3D cultures. These suggest that knockdown of E-cadherin decreasing MDR1 may be by an indirect mechanism. HIF-1α was remarkably increased in 3D cultures. Knockdown of E-cadherin decreased intercellular junctions, increased intercellular space, and decreased HIF-1α in 3D cultures. Knockdown of HIF-1α decreased MDR1 in 3D cultures. Knockdown of E-cadherin increased β-catenin uniformly in 3D cultures, and knockdown of β-catenin decreased MDR1 what was opposite to knockdown of E-cadherin decreasing MDR1. Our data reveal that knockdown of E-cadherin decreasing MDR1 via HIF-1α is involved in the mechanism of multicellular resistance in colorectal cancer. Though β-catenin is also involved in the mechanism, it does not play a dominant role.
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Affiliation(s)
- Xi Liang
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing, 400038, China.,Molecular Biology Center, State Key Laboratory of Trauma, Burn, and Combined Injury, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Xueqing Xu
- Molecular Biology Center, State Key Laboratory of Trauma, Burn, and Combined Injury, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Fengchao Wang
- Institute of Combined Injury, State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, 400038, China
| | - Ni Li
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing, 400038, China
| | - Jianming He
- Department of Oncology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing, 400038, China.
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HPV-16 E6/E7 promotes cell migration and invasion in cervical cancer via regulating cadherin switch in vitro and in vivo. Arch Gynecol Obstet 2015; 292:1345-54. [PMID: 26093522 DOI: 10.1007/s00404-015-3787-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 06/08/2015] [Indexed: 01/06/2023]
Abstract
PURPOSE Cadherin switch, as a key hallmark of epithelial-mesenchymal transition (EMT), is characterized by reduced E-cadherin expression and increased N-cadherin or P-cadherin expression, and has been implicated in many aggressive tumors, but the importance and regulatory mechanism of cadherin switch in cervical cancer have not been investigated. Our study aimed to explore the role of cadherin switch by regulation of HPV-16 E6/E7 in progression and metastasis of cervical cancer. METHODS The expressions of E-cadherin and P-cadherin were examined by immunohistochemical staining in 40 cases of high-grade cervical lesions with HPV-16 infection only in which HPV-16 E6 and E7 expression had been detected using qRT-PCR method. Through modulating E6 and E7 expression using HPV-16 E6/E7 promoter-targeting siRNAs or expressed vector in vitro, cell growth, migration, and invasion were separately tested by MTT, wound-healing and transwell invasion assays, as well as the expressions of these cadherins by western blot analyses. Finally, the expressions of these cadherins in cancerous tissues of BALB/c-nu mouse model inoculated with the stable HPV-16 E6/E7 gene silencing Siha and Caski cells were also measured by immunohistochemical staining. RESULTS Pearson correlation coefficient analyses showed the strongly inverse correlation of E-cadherin expression and strongly positive correlation of P-cadherin expression with E6/E7 level in 40 cases of high-grade cervical lesions. Furthermore, the modulation of HPV-16 E6/E7 expression remarkably influenced cell proliferation, migration, and invasion, as well as the protein levels of E-cadherin and P-cadherin in cervical cell lines. Finally, the reduction of HPV-16 E6/E7 expression led to up-regulated expression of E-cadherin and down-regulated expression of P-cadherin in BALB/c-nu mouse model in vivo assay. CONCLUSIONS Our results unraveled the possibility that HPV-16 E6/E7 could promote cell invasive potential via regulating cadherin switching, and consequently contribute to progression and metastasis of cervical cancer.
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Konze SA, van Diepen L, Schröder A, Olmer R, Möller H, Pich A, Weißmann R, Kuss AW, Zweigerdt R, Buettner FFR. Cleavage of E-cadherin and β-catenin by calpain affects Wnt signaling and spheroid formation in suspension cultures of human pluripotent stem cells. Mol Cell Proteomics 2014; 13:990-1007. [PMID: 24482122 DOI: 10.1074/mcp.m113.033423] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The envisioned clinical and industrial use of human pluripotent stem cells and their derivatives has given major momentum to the establishment of suspension culture protocols that enable the mass production of cells. Understanding molecular changes accompanying the transfer from adherent to suspension culture is of utmost importance because this information can have a direct effect on the development of optimized culture conditions. In this study we assessed the gene expression of human embryonic stem cells and induced pluripotent stem cells grown in surface-adherent culture (two-dimensional) versus free-floating suspension culture spheroids (three-dimensional). We combined a quantitative proteomic approach based on stable isotope labeling by amino acids in cell culture with deep-sequencing-based transcriptomics. Cells in three-dimensional culture showed reduced expression of proteins forming structural components of cell-cell and cell-extracellular matrix junctions. However, fully unexpected, we found up-regulation of secreted inhibitors of the canonical Wnt signaling pathway and, concomitantly, a reduction in the level of active β-catenin and in the expression of Wnt target genes. In Western blot analyses the cysteine protease calpain was shown to cleave E-cadherin and β-catenin under three-dimensional culture conditions. Our data allowed the development of a model in which calpain cleavage of E-cadherin induces the disintegration of focal cell contacts and generates a 100-kDa E-cadherin fragment required for the formation of three-dimensional cell-cell contacts in spheroids. The parallel release of β-catenin and its potential activation by calpain cleavage are counterbalanced by the overexpression of soluble Wnt pathway inhibitors. According to this model, calpain has a key function in the interplay between E-cadherin and β-catenin-mediated intercellular adhesion and the canonical Wnt signaling pathway. Supporting this model, we show that pharmacological modulation of calpain activity prevents spheroid formation and causes disassembly of preexisting spheroids into single cells, thereby providing novel strategies for improving suspension culture conditions for human pluripotent stem cells in the future.
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Affiliation(s)
- Sarah A Konze
- Institute for Cellular Chemistry, Hannover Medical School, 30625 Hannover, Germany
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Substrate-dependent Wnt signaling in MSC differentiation within biomaterial-derived 3D spheroids. Biomaterials 2013; 34:4725-38. [DOI: 10.1016/j.biomaterials.2013.03.031] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 03/11/2013] [Indexed: 12/27/2022]
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Ma HL, Jiang Q, Han S, Wu Y, Tomshine JC, Wang D, Gan Y, Zou G, Liang XJ. Multicellular Tumor Spheroids as an in Vivo–Like Tumor Model for Three-Dimensional Imaging of Chemotherapeutic and Nano Material Cellular Penetration. Mol Imaging 2012. [DOI: 10.2310/7290.2012.00012] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Affiliation(s)
- Hui-li Ma
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
| | - Qiao Jiang
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
| | - Siyuan Han
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
| | - Yan Wu
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
| | - Jin Cui Tomshine
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
| | - Dongliang Wang
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
| | - Yaling Gan
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
| | - Guozhang Zou
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
| | - Xing-Jie Liang
- From the CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National
Center for Nanoscience and Technology of China, Beijing, China, and the Department of Psychiatry,
University of California, San Francisco, San Francisco, CA
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Cai Q, Patel M, Coling D, Hu BH. Transcriptional changes in adhesion-related genes are site-specific during noise-induced cochlear pathogenesis. Neurobiol Dis 2011; 45:723-32. [PMID: 22044737 DOI: 10.1016/j.nbd.2011.10.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 10/06/2011] [Accepted: 10/17/2011] [Indexed: 12/20/2022] Open
Abstract
Cell-cell junctions and junctions between cells and extracellular matrix are essential for maintenance of the structural and functional integrity of the cochlea, and are also a major target of acoustic trauma. While morphological assessments have revealed adhesion dysfunction in noise-traumatized cochleae, the molecular mechanisms responsible for adhesion disruption are not clear. Here, we screened the transcriptional expression of 49 adhesion-related genes in normal rat cochleae and measured the expression changes in the early phases of cochlear pathogenesis after acoustic trauma. We found that genes from four adhesion families, including the immunoglobulin superfamily and the integrin, cadherin, and selectin families, are expressed in the normal cochlea. Exposure to an intense noise at 120dB sound pressure level (SPL) for 2h caused site-specific changes in expression levels in the apical and the basal sections of the sensory epithelium. Expression changes that occurred in the cochlear sensory epithelium were biphasic, with early upregulation at 2h post-noise exposure and subsequent downregulation at 1day post-exposure. Importantly, the altered expression level of seven genes (Sgce, Sell, Itga5, Itgal, Selp, Cntn1 and Col5a1) is related to the level of threshold shift of the auditory brainstem response (ABR), an index reflecting functional change in the cochlea. Notably, the genes showing expression changes exhibited diverse constitutive expression levels and belong to multiple adhesion gene families. The finding of expression changes in multiple families of adhesion genes in a temporal fashion (2h vs. 1day) and a spatial fashion (the apical and the basal sensory epithelia as well as the lateral wall tissue) suggests that acoustic overstimulation provokes a complex response in adhesion genes, which likely involves multiple adhesion-related signaling pathways.
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Affiliation(s)
- Qunfeng Cai
- Center for Hearing and Deafness, State University of New York at Buffalo, 137 Cary Hall, 3435 Main Street, Buffalo, NY 14214, USA.
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de Méndez MT, Bosch AL. Abnormal immunoexpression of cell adhesion molecules (CAMs) in cervical cancer. Int J Surg Pathol 2010; 19:733-42. [PMID: 20643667 DOI: 10.1177/1066896909343435] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The purpose of this study was to examine the immunoexpression of cell adhesion molecules (CAMs) E-cadherin, CD44s, and CD44v3 in cervical cancer and compare it with that in benign exo-endocervical tissue. In all, 81 cervical cancer biopsy specimens and 22 benign controls were included. Primary monoclonal antibodies NHC-38, F10-44-2, and 3G5 for E-cadherin, CD44s, and CD44v3 were used, respectively. Statistical significance was evaluated by the χ(2) test. Antigen expression was significantly different in cervical cancer specimens compared with controls, showing marked decrease in membrane expression: E-cadherin, 6.5% and 77.3% (P < .000); CD44s, 3.9% and 81.8% (P < .000); and CD44v3, 0% and 81.8% (P < .000), respectively. The immunoexpression was significantly heterogeneous in carcinomas (P < .034) and adenocarcinomas (P < .000) for E-cadherin and CD44s. For CD44v3, no case of cancer showed immunostaining in membranes. These findings reaffirm that cell adhesion is markedly altered in cervical cancer. The authors suggest that these proteins could serve as markers for invasive cervical neoplasia.
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Affiliation(s)
- Morelva Toro de Méndez
- School of Pharmaceutics and Analytical Biosciences, University of Los Andes, Mérida, Venezuela.
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Hu BH, Cai Q. Acoustic overstimulation modifies Mcl-1 expression in cochlear sensory epithelial cells. J Neurosci Res 2010; 88:1812-21. [PMID: 20091770 DOI: 10.1002/jnr.22333] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Acoustic overstimulation causes apoptotic cell death in the cochlea. This death process is mediated, in part, by the mitochondrial signaling pathway involving Bcl-2 family proteins. Myeloid cell leukemia sequence 1 (Mcl-l) is an antiapoptotic member of the Bcl-2 family. Its involvement in noise-induced hair cell death has not been characterized. Here we report the endogenous expression and the noise-induced expression of Mcl-1 in Sprague Dawley rat cochleae. In the sensory epithelia of normal cochleae, there is strong constitutive expression of Mcl-1 mRNA, with an expression level higher than that of many other Bcl-2 family genes. The Mcl-1 protein is preferentially expressed in outer hair cells. After exposure to a high level of continuous noise at 115-dB sound pressure level for 1 hr, Mcl-1 expression displays a time-dependent alteration, with up-regulation of Mcl-1 mRNA at 4 hr postexposure and protein up-regulation at 1 day postexposure. Western blot analysis reveals the up-regulated Mcl-1 as the full-length form of Mcl-1. Immunolabeling of the Mcl-1 protein reveals the early increase in Mcl-1 immunoreactivity in the nuclear region of the hair cells displaying apoptotic phenotypes and a subsequent increase in survival hair cells. These results suggest that Mcl-1 is involved in the regulation of hair cell pathogenesis resulting from acoustic stress, possibly by influencing the nuclear events of apoptosis.
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Affiliation(s)
- Bo Hua Hu
- Center for Hearing and Deafness, State University of New York at Buffalo, Buffalo, New York 14214, USA.
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Lin RZ, Lin RZ, Chang HY. Recent advances in three-dimensional multicellular spheroid culture for biomedical research. Biotechnol J 2009; 3:1172-84. [PMID: 18566957 DOI: 10.1002/biot.200700228] [Citation(s) in RCA: 831] [Impact Index Per Article: 55.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Many types of mammalian cells can aggregate and differentiate into 3-D multicellular spheroids when cultured in suspension or a nonadhesive environment. Compared to conventional monolayer cultures, multicellular spheroids resemble real tissues better in terms of structural and functional properties. Multicellular spheroids formed by transformed cells are widely used as avascular tumor models for metastasis and invasion research and for therapeutic screening. Many primary or progenitor cells on the other hand, show significantly enhanced viability and functional performance when grown as spheroids. Multicellular spheroids in this aspect are ideal building units for tissue reconstruction. Here we review the current understanding of multicellular spheroid formation mechanisms, their biomedical applications, and recent advances in spheroid culture, manipulation, and analysis techniques.
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Affiliation(s)
- Ruei-Zeng Lin
- Institute of Molecular Medicine, National Tsing Hua University, Hsin Chu, Taiwan
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