1
|
Salahudeen AA, Choi SS, Rustagi A, Zhu J, van Unen V, de la O SM, Flynn RA, Margalef-Català M, Santos AJM, Ju J, Batish A, Usui T, Zheng GXY, Edwards CE, Wagar LE, Luca V, Anchang B, Nagendran M, Nguyen K, Hart DJ, Terry JM, Belgrader P, Ziraldo SB, Mikkelsen TS, Harbury PB, Glenn JS, Garcia KC, Davis MM, Baric RS, Sabatti C, Amieva MR, Blish CA, Desai TJ, Kuo CJ. Progenitor identification and SARS-CoV-2 infection in human distal lung organoids. Nature 2020; 588:670-675. [PMID: 33238290 PMCID: PMC8003326 DOI: 10.1038/s41586-020-3014-1] [Citation(s) in RCA: 209] [Impact Index Per Article: 52.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 11/18/2020] [Indexed: 12/17/2022]
Abstract
The distal lung contains terminal bronchioles and alveoli that facilitate gas exchange. Three-dimensional in vitro human distal lung culture systems would strongly facilitate the investigation of pathologies such as interstitial lung disease, cancer and coronavirus disease 2019 (COVID-19) pneumonia caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Here we describe the development of a long-term feeder-free, chemically defined culture system for distal lung progenitors as organoids derived from single adult human alveolar epithelial type II (AT2) or KRT5+ basal cells. AT2 organoids were able to differentiate into AT1 cells, and basal cell organoids developed lumens lined with differentiated club and ciliated cells. Single-cell analysis of KRT5+ cells in basal organoids revealed a distinct population of ITGA6+ITGB4+ mitotic cells, whose offspring further segregated into a TNFRSF12Ahi subfraction that comprised about ten per cent of KRT5+ basal cells. This subpopulation formed clusters within terminal bronchioles and exhibited enriched clonogenic organoid growth activity. We created distal lung organoids with apical-out polarity to present ACE2 on the exposed external surface, facilitating infection of AT2 and basal cultures with SARS-CoV-2 and identifying club cells as a target population. This long-term, feeder-free culture of human distal lung organoids, coupled with single-cell analysis, identifies functional heterogeneity among basal cells and establishes a facile in vitro organoid model of human distal lung infections, including COVID-19-associated pneumonia.
Collapse
Affiliation(s)
- Ameen A Salahudeen
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
- Division of Hematology and Oncology, Department of Medicine, University of Illinois at Chicago College of Medicine, Chicago, IL, USA
| | - Shannon S Choi
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Arjun Rustagi
- Division of Infectious Disease and Geographic Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Junjie Zhu
- Stanford University School of Engineering, Department of Electrical Engineering, Stanford, CA, USA
| | - Vincent van Unen
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA
- Stanford Institute of Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA, USA
| | - Sean M de la O
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Ryan A Flynn
- Stanford ChEM-H, Stanford University, Stanford, CA, USA
- Department of Chemistry, Stanford University, Stanford, CA, USA
| | - Mar Margalef-Català
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
| | - António J M Santos
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Jihang Ju
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Arpit Batish
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Tatsuya Usui
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | | | - Caitlin E Edwards
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Lisa E Wagar
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA
- Stanford Institute of Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA, USA
| | - Vincent Luca
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA
| | - Benedict Anchang
- Division of Biomedical Data Science, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Monica Nagendran
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Khanh Nguyen
- Division of Gastroenterology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Daniel J Hart
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | | | | | | | | | - Pehr B Harbury
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA, USA
| | - Jeffrey S Glenn
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA
- Division of Gastroenterology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - K Christopher Garcia
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Mark M Davis
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA
- Stanford Institute of Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA, USA
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Ralph S Baric
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Chiara Sabatti
- Division of Biomedical Data Science, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Manuel R Amieva
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA
- Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, USA
| | - Catherine A Blish
- Division of Infectious Disease and Geographic Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA.
- Chan Zuckerberg Biohub, San Francisco, CA, USA.
| | - Tushar J Desai
- Division of Pulmonary, Allergy and Critical Care, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA.
| | - Calvin J Kuo
- Division of Hematology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA.
| |
Collapse
|
2
|
Atsuta I, Ayukawa Y, Yamaza T, Furuhashi A, Koyano K. The role of phosphoinositide 3-kinase in adhesion of oral epithelial cells to titanium. Arch Oral Biol 2013; 58:1696-708. [PMID: 24112737 DOI: 10.1016/j.archoralbio.2013.07.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Revised: 07/23/2013] [Accepted: 07/28/2013] [Indexed: 12/24/2022]
Abstract
BACKGROUND Oral epithelial cells (OECs) adhesion to titanium may improve the success rate of implant restoration. PURPOSE We investigated the mechanism by which OECs adhere to titanium dental implants. MATERIALS AND METHODS (1) After culturing rat OECs on titanium plates (Ti) or culture dishes in the presence or absence of a phosphoinositide 3-kinase (PI3K) activator or inhibitors and/or growth factors, and OEC morphology under these conditions were analyzed. (2) Right maxillary first molars were extracted and replaced with experimental implants. The rats were treated with or without growth factors. RESULTS (1) Cell adherence was lower of OECs on Ti than in those on culture dishes, as were the levels of integrin β4 and the continuity of F-actin structures. After PI3K inhibition, markedly reducing adherence to both substrates. In contrast, PI3K activation with activator or insulin-like growth factor restored the OEC adherence and the expression of adhesion molecules on Ti to the levels seen in OECs cultured on dishes. Cell migration was inhibited by PI3K activation. (2) High expression of integrin β4 was observed in the peri-implant epithelia of PI3K-activated rats. CONCLUSION These findings suggest that PI3K plays an important role in the adhesion of OECs to Ti.
Collapse
Affiliation(s)
- Ikiru Atsuta
- Section of Implant and Rehabilitative Dentistry, Devision of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; Center for Craniofacial Molecular Biology, University of Southern California School of Dentistry, Los Angeles, CA 90033, USA.
| | | | | | | | | |
Collapse
|
3
|
Zheng Y, de la Cruz CC, Sayles LC, Alleyne-Chin C, Vaka D, Knaak TD, Bigos M, Xu Y, Hoang CD, Shrager J, Fehling HJ, French D, Forrest W, Jiang Z, Jackson EL, Sweet-Cordero EA. A rare population of CD24(+)ITGB4(+)Notch(hi) cells drives tumor propagation in NSCLC and requires Notch3 for self-renewal. Cancer Cell 2013; 24:59-74. [PMID: 23845442 PMCID: PMC3923526 DOI: 10.1016/j.ccr.2013.05.021] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 04/05/2013] [Accepted: 05/30/2013] [Indexed: 01/15/2023]
Abstract
Sustained tumor progression has been attributed to a distinct population of tumor-propagating cells (TPCs). To identify TPCs relevant to lung cancer pathogenesis, we investigated functional heterogeneity in tumor cells isolated from Kras-driven mouse models of non-small-cell lung cancer (NSCLC). CD24(+)ITGB4(+)Notch(hi) cells are capable of propagating tumor growth in both a clonogenic and an orthotopic serial transplantation assay. While all four Notch receptors mark TPCs, Notch3 plays a nonredundant role in tumor cell propagation in two mouse models and in human NSCLC. The TPC population is enriched after chemotherapy, and the gene signature of mouse TPCs correlates with poor prognosis in human NSCLC. The role of Notch3 in tumor propagation may provide a therapeutic target for NSCLC.
Collapse
Affiliation(s)
- Yanyan Zheng
- Cancer Biology Program, Department of Pediatrics, Stanford University School of Medicine, Stanford, California, 94305. U.S.A
| | | | - Leanne C. Sayles
- Cancer Biology Program, Department of Pediatrics, Stanford University School of Medicine, Stanford, California, 94305. U.S.A
| | - Chris Alleyne-Chin
- Cancer Biology Program, Department of Pediatrics, Stanford University School of Medicine, Stanford, California, 94305. U.S.A
- Department of Biology, San Francisco State University, 1600 Holloway Ave, San Francisco CA 94132
| | - Dedeepya Vaka
- Cancer Biology Program, Department of Pediatrics, Stanford University School of Medicine, Stanford, California, 94305. U.S.A
| | - Tim D. Knaak
- Stanford Shared FACS Facility, Center for Molecular and Genetic Medicine, Stanford University, Stanford, California, 94305
| | - Marty Bigos
- Stanford Shared FACS Facility, Center for Molecular and Genetic Medicine, Stanford University, Stanford, California, 94305
| | - Yue Xu
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California, 94305. U.S.A
| | - Chuong D. Hoang
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California, 94305. U.S.A
| | - Joseph Shrager
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, California, 94305. U.S.A
| | - Hans Joerg Fehling
- Institute of Immunology, University Clinics Ulm, Albert-Einstein-Allee 11, D-89081 Ulm
| | - Dorothy French
- Genentech, Inc. 1 DNA Way, South San Francisco, 94080-4990
| | | | - Zhaoshi Jiang
- Genentech, Inc. 1 DNA Way, South San Francisco, 94080-4990
| | - Erica L. Jackson
- Genentech, Inc. 1 DNA Way, South San Francisco, 94080-4990
- Correspondence: or
| | - E. Alejandro Sweet-Cordero
- Cancer Biology Program, Department of Pediatrics, Stanford University School of Medicine, Stanford, California, 94305. U.S.A
- Correspondence: or
| |
Collapse
|
4
|
Del Rio P, Crafa P, Papadia C, Benecchi L, Campanini N, Sianesi N, Montana CM, Sianesi M. Is CD10 a reliable marker of invasive colorectal cancer? Ann Ital Chir 2011; 82:279-282. [PMID: 21834477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
AIM Previous studies reported that CD10 positive Colorectal Cancer Cells (CRC) characterized by deeply invasive neoplasia. MATERIALS AND METHODS We have examined 50 pts surgically treated for colorectal cancer on at least 5 years follow up. TNM, grading score and survival have been compared to CD10 expression. RESULTS Thirty-four out of fifty cases have been analyzed (18 males and 16 female) of whom nineteen were CD10 positive and fifteen were CD10 negative. The remaining 16 cases were droping out. No difference in survival rate between CD10 positive and negative in N0, N1, N2. No difference on survival rate and grading 1, 2, 3. We have then analyzed CD10 positive and CD10 negative cases, according to neoplasia grading, in patients with positive linphonodes N1 and N2. We showed a statistical difference between the CD10 positive/N2 (grading 1.66 +/- 0.5) and the CD10 negative/N2 (grading 3) (p < 0.005). CONCLUSIONS We can hypothesize that CD10 positive neoplasia display a more invasive behaviour, independently from the N score and the G score, compared to CD10 negative neoplasia.
Collapse
Affiliation(s)
- Paolo Del Rio
- Department of Surgical Science, General Surgery and Organ Transplantation, University Hospital of Parma, Parma, Italy.
| | | | | | | | | | | | | | | |
Collapse
|
5
|
Sugisawa M, Masaoka T, Enokiya Y, Muramatsu T, Hashimoto S, Yamada S, Shimono M. Expression and function of laminin and integrins on adhesion/migration of primary culture cells derived from rat oral epithelium. J Periodontal Res 2010; 45:284-91. [PMID: 20470260 DOI: 10.1111/j.1600-0765.2009.01231.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND AND OBJECTIVE It remains controversial whether or not the junctional epithelium cells that are directly attached to teeth migrate on the enamel surface, as those cells are able to adhere firmly to the enamel. The aim of this study was to investigate the expression patterns of laminin gamma(2), integrin beta(4) and integrin alpha(3), and to examine their potential function in cell migration. MATERIAL AND METHODS Oral epithelium cells obtained from Sprague-Dawley rats were established in primary culture. We employed a wound-healing assay to characterize the direction of cell extension at the start of cell migration, and observed different localizations of laminin and integrins using immunofluorescence. For functional analyses of integrins, we employed a phosphatidylinositol-3-kinase (PI3K) activator to promote integrin beta(4) function and used P1B5 to inhibit integrin alpha(3) function, and we analyzed the percentage of re-epithelialization as the migration function. RESULTS Marked accumulation of laminin gamma(2) was detected in the peripheral cytoplasm of cells adjacent to the wound area, as shown by the results of the migration assay. Integrin beta(4) was detected in the distal cell processes of actively migrating cells, while integrin alpha(3) was found in cell membranes of cells adjacent to the wound area. In the functional analyses, the percentage of re-epithelialization was significantly lower in the PI3K-activator group and in the P1B5-treated group (2.5% and 7.2%, respectively) than in the control group (39.0%) (p < 0.01). CONCLUSION The results suggest that laminin gamma(2) is secreted as a foothold for cell migration, that integrin beta(4) participates in cell adhesion and that integrin alpha(3) is involved in cell migration in the primary culture cells.
Collapse
|
6
|
Masaoka T, Hashimoto S, Kinumatsu T, Muramatsu T, Jung HS, Yamada S, Shimono M. Immunolocalization of laminin and integrin in regenerating junctional epithelium of mice after gingivectomy. J Periodontal Res 2009; 44:489-95. [PMID: 18973515 DOI: 10.1111/j.1600-0765.2008.01142.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
BACKGROUND AND OBJECTIVE The expression patterns of adhesive proteins and extracellular matrix proteins in regenerating gingival epithelium after gingivectomy are unknown. The aim of this study was to examine the expression of laminin 1, laminin gamma(2) (a specific component of laminin 5), integrin beta(4) and integrin alpha(3) in the regenerating gingival epithelium in order to understand the mechanism of wound healing during reconstitution of the sulcular environment. MATERIAL AND METHODS The palatal gingivae of the maxillary molars of Institute of Cancer Research mice were excised, and the regenerating tissues were examined 1, 3, 5, 7 and 14 days later. Fresh, non-fixed and non-decalcified frozen sections were prepared and stained using immunofluorescence. RESULTS At 1 day post-surgery, intense expression of laminin gamma(2), integrin beta(4) and integrin alpha(3) was distinct in the frontal margin of the regenerating oral epithelium. Laminin gamma(2) was diffusely detected on the root surface and in connective tissues beneath the regenerating oral epithelium at 3 and 5 days. At 7 days, laminin gamma(2) was intermittently recognizable in the internal basal lamina (IBL) close to tooth-facing cells, while laminin gamma(2), integrin beta(4) and integrin alpha(3) were observed in the IBL and in the external basal lamina (EBL) of the regenerating junctional epithelium at 14 days. CONCLUSION These results suggest that secretion of laminin 5 in the connective tissue may induce epithelial cell migration, and that binding of laminin 5 to integrin alpha(6)beta(4) and integrin alpha(3)beta(1) in the IBL may provoke cell adhesion and migration of cells facing the tooth on the enamel surface of the regenerating junctional epithelium.
Collapse
Affiliation(s)
- T Masaoka
- Oral Health Science Center HRC7, Tokyo Dental College, Chiba, Japan
| | | | | | | | | | | | | |
Collapse
|
7
|
Iwata H, Kamio N, Aoyama Y, Yamamoto Y, Hirako Y, Owaribe K, Kitajima Y. IgG from patients with bullous pemphigoid depletes cultured keratinocytes of the 180-kDa bullous pemphigoid antigen (type XVII collagen) and weakens cell attachment. J Invest Dermatol 2009; 129:919-26. [PMID: 19177144 DOI: 10.1038/jid.2008.305] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We have shown that binding of bullous pemphigoid (BP)-patient IgG (BP-IgG) causes the internalization of BP180 from the cell membrane. This study examined whether BP-IgG treatment can deplete cultured keratinocytes of BP180, how it affects cellular levels of alpha6 and beta4 integrins (by western blot analysis using monoclonal antibodies to these antigens), and whether it reduces adhesion of cells to the culture dish (by a vibration detachment assay). All BP-IgG or BP sera with high values of BP180-ELISA from 18 BP patients before and after oral corticosteroid treatment showed dramatically decreased BP180 in cells after 6 hours of BP-IgG stimulation, whereas alpha6 and beta4 integrin levels were not decreased. Even IgG from patients in whom oral corticosteroid had suppressed active blistering could deplete cells of BP180, as long as sera retained a high value of BP180-ELISA. On the other hand, reduction of cell BP180 content increased detachment of cells from the dish. These results suggest that BP-IgG reduces hemidesmosomal BP180 content, weakening the adhesion of hemidesmosomes to the lamina densa. In the presence of BP180 deficiency, inflammation generated by BP180 immune-complex formation might then tear the weakened lamina lucida, and this could lead to generation of the BP-specific split at the lamina lucida.
Collapse
Affiliation(s)
- Hiroaki Iwata
- Department of Dermatology, Gifu Graduate School of Medicine, Gifu, Japan
| | | | | | | | | | | | | |
Collapse
|
8
|
Kinumatsu T, Hashimoto S, Muramatsu T, Sasaki H, Jung HS, Yamada S, Shimono M. Involvement of laminin and integrins in adhesion and migration of junctional epithelium cells. J Periodontal Res 2009; 44:13-20. [PMID: 18973537 DOI: 10.1111/j.1600-0765.2007.01036.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND OBJECTIVE The junctional epithelium attaches to the enamel surface with hemidesmosomes (of which laminin-5 and integrin-alpha(6)beta(4) are the main components) in the internal basal lamina. Laminin-5 is also involved in cell motility with integrin-alpha(3)beta(1), although their functions have not yet been clarified.The purpose of this study was to determine the functions of those adhesive components between the tooth and the junctional epithelium during cell migration.Because an idea has been proposed that directly attached to tooth cells (DAT cells) may not contribute to cell migration, 5-bromo-2-deoxyuridine staining was performed to confirm cell migration. MATERIAL AND METHODS We investigated laminin-gamma(2) (contained only in laminin-5), integrin-beta(4) (involved in cell-extracellular matrix contact) and integrin-alpha(3) (inducing cell migration) in the junctional epithelium, oral gingival epithelium and gingival sulcus epithelium of 6-wk-old ICR mice using laser microdissection, quantitative real-time reverse transcription-polymerase chain reaction, immunofluorescence and 5-bromo-2-deoxyuridine staining. RESULTS Laminin and integrins were clearly immuno-localized in the basal lamina of all epithelium. Quantitative analysis of laminin and integrin mRNAs by laser microdissection showed that they were more highly expressed in DAT cells than in basal cells in the oral gingival epithelium. In particular, a 12-fold higher expression of laminin-5 was observed in the junctional epithelium compared with the oral gingival epithelium. 5-Bromo-2-deoxyuridine staining showed rapid coronal migration of DAT cells. CONCLUSION These results suggest that the abundant expression of laminin-5 and integrin-alpha(6)beta(4) is involved in the attachment of DAT cells to teeth by hemidesmosomes. Abundant expression of laminin-5 and integrin-alpha(3)beta(1) might assist in DAT cell migration, confirmed by 5-bromo-2-deoxyuridine staining during the turnover of junctional epithelium.
Collapse
Affiliation(s)
- T Kinumatsu
- Department of Periodontics, Tokyo Dental College, Chiba, Japan
| | | | | | | | | | | | | |
Collapse
|
9
|
Baba Y, Iyama KI, Hirashima K, Nagai Y, Yoshida N, Hayashi N, Miyanari N, Baba H. Laminin-332 promotes the invasion of oesophageal squamous cell carcinoma via PI3K activation. Br J Cancer 2008; 98:974-80. [PMID: 18283320 PMCID: PMC2266844 DOI: 10.1038/sj.bjc.6604252] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2007] [Revised: 01/15/2008] [Accepted: 01/16/2008] [Indexed: 01/16/2023] Open
Abstract
Laminin-332 is major component of epithelial basement membrane, and has an important role in cell migration and tumour invasion. Recently, the phosphatidylinositol 3-kinase (PI3K) activation induced by laminin-332 during carcinogenesis or tumour invasion has been highlighted in skin squamous cell carcinoma. The expression of laminin-332 in 126 resected oesophageal squamous cell carcinoma (ESCC) specimens was immunohistochemically examined to determine its associations with the clinicopathological characteristics, and the effect of laminin-332 on the invasiveness and the PI3K activation was assessed by in vitro experiments using ESCC cell lines (ESCCs). Sections with immunostaining signals in >30% cancer cells, which were observed in 55 of 126 cases, were judged to be positive for laminin-332. The positivity was significantly correlated with pTNM stage and poor prognosis. Inactivation of the PI3K pathway by laminin-332 blocking antibody suppressed the invasiveness of TE8 cell line, which secreted laminin-332 at high level and had high PI3K activity. The addition of the purified laminin-332 activated the PI3K pathway and increased the invasiveness of TE11 cell line, which secreted laminin-332 at lower level and had low PI3K activity. The deactivation of PI3K pathway using the PI3K inhibitor decreased the invasiveness of ESCCs and the secretion of laminin-332 in vitro. The expression of laminin-332 was one of the prognostic factors of ESCC. Laminin-332 could provide the autocrine positive-feedback loop through PI3K activation, contributing the invasive ability. Therefore, the inhibitor of PI3K pathway might be useful as the anticancer therapies for ESCC.
Collapse
Affiliation(s)
- Y Baba
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
- Department of Surgical Pathology, Kumamoto University Hospital, 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
| | - K-i Iyama
- Department of Surgical Pathology, Kumamoto University Hospital, 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
| | - K Hirashima
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
| | - Y Nagai
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
| | - N Yoshida
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
| | - N Hayashi
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
| | - N Miyanari
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
| | - H Baba
- Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University 1-1-1 Honjo, Kumamoto City, Kumamoto 860-8556, Japan
| |
Collapse
|
10
|
Lourenço SV, Lima DMC. Pleomorphic adenoma and adenoid cystic carcinoma: in vitro study of the impact of TGFbeta1 on the expression of integrins and cytoskeleton markers of cell differentiation. Int J Exp Pathol 2007; 88:191-8. [PMID: 17504449 PMCID: PMC2517303 DOI: 10.1111/j.1365-2613.2007.00527.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Pleomorphic adenoma (PA) and adenoid cystic carcinoma (ACC) are the commonest benign and malignant salivary gland tumours respectively. Interactions between cells and extracellular matrix of PA and ACC, partially mediated by integrins, are important in their biology. The expression of integrins is regulated by numerous factors, amongst them, transforming growth factor beta1 (TGFbeta1). Our study investigated the effects of TGFbeta1 on the expression of integrin beta subunits in vitro and on the expression of cytoskeletal proteins of cells derived from PA and ACC. The expression of cytoskeletal differentiation markers and integrins was assessed using immunofluorescence. ELISA assays were employed to quantitate the expression integrins and MTT assays evaluated the mitochondrial activity of cells stimulated with TGFbeta1. PA cells showed increased expression of integrins and de novo expression of differentiation markers upon TGFbeta1 stimulation. ACC cells were less responsive to such stimulation. This may reflect important differences in the biological behaviour of benign and malignant cells.
Collapse
|
11
|
Abstract
The tetraspanin CD151 forms complexes in epithelial cell membranes with laminin-binding integrins alpha6beta4, alpha3beta1, and alpha6beta1, and modifies integrin-mediated cell migration in vitro. We demonstrate in this study that CD151 expression is upregulated in a distinct temporal and spatial pattern during wound healing, particularly in the migrating epidermal tongue at the wound edge, suggesting a role for CD151 in keratinocyte migration. We show that healing is significantly impaired in CD151-null mice, with wounds gaping wider at 7 days post-injury. The rate of re-epithelialization of the CD151-null wounds is adversely affected, with significantly less wound area being covered by migrating epidermal cells. Our studies reveal that although laminin levels are similar in wild-type and CD151-null wounds, the organization of the laminin in the basement membrane is impaired. Furthermore, upregulation of alpha6 and beta4 integrin expression is adversely affected in CD151-null mice wounds. In contrast, we find no significant effect of CD151 gene knockout on alpha3 and beta1 integrin expression in wound repair. We suggest that mice lacking the CD151 gene are defective in wound healing, primarily owing to impairment of the re-epithelialization process. This may be due to defective basement membrane formation and epithelial cell adhesion and migration.
Collapse
Affiliation(s)
- Allison J Cowin
- Child Health Research Institute, North Adelaide, South Australia, Australia.
| | | | | | | | | | | |
Collapse
|
12
|
Sawai H, Okada Y, Funahashi H, Matsuo Y, Takahashi H, Takeyama H, Manabe T. Interleukin-1alpha enhances the aggressive behavior of pancreatic cancer cells by regulating the alpha6beta1-integrin and urokinase plasminogen activator receptor expression. BMC Cell Biol 2006; 7:8. [PMID: 16504015 PMCID: PMC1388210 DOI: 10.1186/1471-2121-7-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2005] [Accepted: 02/20/2006] [Indexed: 11/17/2022] Open
Abstract
Background In human pancreatic cancer progression, the α6β1-integrin is expressed on cancer cell surface during invasion and metastasis formation. In this study, we investigated whether interleukin (IL)-1α induces the alterations of integrin subunits and urokinase plasminogen activator/urokinase plasminogen activator receptor (uPA/uPAR) expression in pancreatic cancer cells. We hypothesize that the alterations of integrin subunits and uPA/uPAR expression make an important role in signaling pathways responsible for biological behavior of pancreatic cancer cells. Results IL-1α upregulated the expression of α6 and β1 integrins without any alterations of α5 and αv integrins expression. IL-1α also induced enhancement in the expression of uPA/uPAR in pancreatic cancer cells. IL-1α enhanced the proliferation, adhesion, and migration in pancreatic cancer cells, and IL-1α-induced alterations of uPA/uPAR expression correlated with the increased the migration of pancreatic cancer cells. Upregulation of α6 integrin subunit and uPA/uPAR correlated with the activation of Ras and downstream extracellular signal-regulated kinase (ERK) pathways. IL-1α-induced activation of Ras and downstream ERK can be inhibited by using inhibitory antibodies against α6 and β1 integrin and uPAR, consistent with the inhibition of proliferation, adhesion and migration of pancreatic cancer cells. Immunohistochemical analysis demonstrated a significant association between strong expressions of α6 integrin with uPAR in pancreatic cancer specimens. Furthermore, the strong expression of α6 integrin and uPAR was found to be independent prognosticator in pancreatic cancer patients. Conclusion Based on these findings, we conclude that IL-1α can induce selective upregulation of α6β1-integrin and uPA/uPAR in pancreatic cancer cells and these changes may modulate the aggressive functions of pancreatic cancer.
Collapse
MESH Headings
- Aged
- Aged, 80 and over
- Carcinoma, Pancreatic Ductal/chemistry
- Carcinoma, Pancreatic Ductal/mortality
- Carcinoma, Pancreatic Ductal/pathology
- Cell Adhesion/drug effects
- Cell Division/drug effects
- Cell Line, Tumor/drug effects
- Cell Line, Tumor/metabolism
- Cell Line, Tumor/pathology
- Cell Movement/drug effects
- Extracellular Signal-Regulated MAP Kinases/physiology
- Female
- Humans
- Integrin alpha5/analysis
- Integrin alpha6beta1/biosynthesis
- Integrin alpha6beta1/genetics
- Integrin alphaV/analysis
- Integrin beta4/analysis
- Interleukin-1/pharmacology
- Laminin/metabolism
- Life Tables
- Male
- Middle Aged
- Neoplasm Invasiveness/physiopathology
- Neoplasm Proteins/biosynthesis
- Neoplasm Proteins/genetics
- Neoplasm Proteins/physiology
- Pancreatic Neoplasms/chemistry
- Pancreatic Neoplasms/mortality
- Pancreatic Neoplasms/pathology
- Proto-Oncogene Proteins p21(ras)/physiology
- Receptors, Cell Surface/biosynthesis
- Receptors, Cell Surface/genetics
- Receptors, Urokinase Plasminogen Activator
- Recombinant Fusion Proteins/pharmacology
- Signal Transduction/drug effects
- Survival Analysis
- Up-Regulation/drug effects
- Urokinase-Type Plasminogen Activator/biosynthesis
- Urokinase-Type Plasminogen Activator/genetics
Collapse
Affiliation(s)
- Hirozumi Sawai
- Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 4678601, Japan
| | - Yuji Okada
- Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 4678601, Japan
| | - Hitoshi Funahashi
- Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 4678601, Japan
| | - Yoichi Matsuo
- Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 4678601, Japan
| | - Hiroki Takahashi
- Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 4678601, Japan
| | - Hiromitsu Takeyama
- Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 4678601, Japan
| | - Tadao Manabe
- Department of Gastroenterological Surgery, Nagoya City University Graduate School of Medical Sciences, Nagoya 4678601, Japan
| |
Collapse
|
13
|
Tanno M, Hashimoto S, Muramatsu T, Matsuki M, Yamada S, Shimono M. Differential localization of laminin gamma2 and integrin beta4 in primary cultures of the rat gingival epithelium. J Periodontal Res 2006; 41:15-22. [PMID: 16409251 DOI: 10.1111/j.1600-0765.2005.00831.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The aim of this study was to investigate the differential immunolocalization of laminin gamma(2) and integrin beta(4) in primary cultures of the rat gingival epithelium. METHODS The gingival epithelium was obtained from Sprague-Dawley rats and was cultured in serum-free keratinocyte growth medium (DK-SFM). Western blotting analysis, immunofluorescence, confocal laser scanning microscopy (CLSM), and immuno-gold labeling for laminin gamma(2) and integrin beta(4) were employed. CLSM images for laminin and integrin were analyzed in horizontal (x-y axis) and in vertical (x-z axis) sections. RESULTS Both laminin gamma(2) and integrin beta(4) were detected by Western blot analysis in the gingival epithelium. Immunolocalization of laminin gamma(2) was distinct in the cytoplasm to form one or two irregular rings in gingival epithelial cells. By contrast, integrin beta(4) was localized diffusely in the cytoplasm. F-actin (indicating actin filaments) was clearly discernible at the periphery of the cytoplasm to form a cellular fringe. In x-z axis images obtained by CLSM, laminin gamma(2) was recognized as large foci in the most inner portion just above the basal plasma membrane. Integrin beta(4) existed in the area where F-actin was labeled surrounding the membrane. Immuno-electron microscopy showed that 10nm colloidal gold particles indicating laminin gamma(2) were mainly localized at the extracellular portion and in the peripheral cytoplasm, whereas integrin beta(4) was distributed in the cytoplasm close to the basal plasma membrane but not in extracellular regions. CONCLUSIONS In primary cultures of the rat gingival epithelium, both laminin gamma(2) and integrin beta(4) may be produced by the epithelium, and irregular rings of laminin gamma(2) are formed in areas where gingival cells adhere to the extracellular matrix.
Collapse
Affiliation(s)
- Michie Tanno
- Department of Periodontics, Tokyo Dental College, Chiba, Japan
| | | | | | | | | | | |
Collapse
|
14
|
Abban G, Erdogan D, Ozogul C, Take G, Yildirim NB. Immunohistochemical localization of beta1 and beta4 integrins in mouse endometrium during implantation and early pregnancy. ACTA ACUST UNITED AC 2005; 92:153-62. [PMID: 16268053 DOI: 10.1556/aphysiol.92.2005.2.6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Implantation presents the remarkable synchronisation between the development of embryo and differentiation of endometrium. Cell-cell adhesion is an important phenomenon taking place during blastocyst implantation in uterine membrane. We think that the investigation of existence and the level of integrins in women can be a guide for treatment of infertility. Our purpose in this study was to show expression beta1 and beta4 integrins on gestational days 4, 6, 12 by immunohistochemical methods and to investigate whether beta4 integrin is a useful marker for receptivity. beta1 and beta4 integrin were exhibited on surface epithelium on gestational day 4. On the other hand, strong beta4 immunoreactivity was detected on surface epithelium and glandular cells on gestational day 12 but no beta1 reactivity was present in the surface epithelium and glandular cells on day 12. In conclusion, both beta1 and beta4 integrins may have a role in implantation process because positive immunoreactivity was seen on apical membrane of surface epithelium on day 4 when implantation occurred. The localization to apical pole of surface epithelium suggest a role for beta1, beta4 integrins in initial embryo and endometrium interaction. It does not seem that beta1 integrin has a role supporting pregnancy since expression of beta4 on surface epithelium and glandular epithelium disappeared on day 12. beta4 integrin expression increasing on day 12 of pregnancy leads us to think a possible functional role supporting pregnancy.
Collapse
Affiliation(s)
- G Abban
- Department of Histology-Embryology, Faculty of Medicine, Pamukkale University, Denizli, Turkey.
| | | | | | | | | |
Collapse
|
15
|
Zhao J, Miao J, Zhao B, Zhang S. Upregulating of Fas, integrin β4 and P53 and depressing of PC-PLC activity and ROS level in VEC apoptosis by safrole oxide. FEBS Lett 2005; 579:5809-13. [PMID: 16225864 DOI: 10.1016/j.febslet.2005.09.051] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2005] [Accepted: 09/15/2005] [Indexed: 12/13/2022]
Abstract
Previously, we found that safrole oxide could trigger vascular endothelial cell (VEC) apoptosis. In this study, to investigate its mechanism to induce apoptosis in VECs, the activities of nitric oxide synthetase and phosphatidylcholine specific phospholipase C, the level of reactive oxygen species and the expressions of Fas, integrin beta4 and P53 were analyzed. The data showed that safrole oxide induced apoptosis by increasing the expressions of Fas, integrin beta4 and P53, and depressing the activity of Ca(2+)-independent phosphatidylcholine-specific phospholipase C and intracellular reactive oxygen species levels in VECs.
Collapse
Affiliation(s)
- Jing Zhao
- Institute of Developmental Biology, School of Life Science, Shandong University, Jinan, China
| | | | | | | |
Collapse
|
16
|
Chitcholtan K, Garrill A. A beta4 integrin-like protein co-localises with a phosphotyrosine containing protein in the oomycete Achlya bisexualis: inhibition of tyrosine phosphorylation slows tip growth. Fungal Genet Biol 2005; 42:534-45. [PMID: 15893255 DOI: 10.1016/j.fgb.2005.03.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2005] [Revised: 03/10/2005] [Accepted: 03/16/2005] [Indexed: 11/21/2022]
Abstract
We present immunocytochemical data that indicate the presence of, and a close association between beta4 integrin-like proteins and proteins containing phosphorylated tyrosine residues in the oomycete Achlya bisexualis. When hyphae were plasmolysed, these proteins were present in wall-membrane attachment sites where there was also F-actin. A combination of immunoblots, ELISA, and a coupled enzyme assay suggest that phosphorylation may occur by both autophosphorylation and through the action of a tyrosine kinase. Tyrphostins, which are inhibitors of tyrosine kinases, abolished the anti-phosphotyrosine staining, inhibited the kinase activity, slowed tip growth and affected the organisation of the actin cytoskeleton, in a dose-dependent manner. By analogy with the integrins and associated kinases of the metazoa we suggest that these proteins could contribute to the process of tip growth by providing a means of bidirectional signaling between the cell wall and the cytoplasm.
Collapse
Affiliation(s)
- Kenny Chitcholtan
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
| | | |
Collapse
|
17
|
Rigort A, Grünewald J, Herzog V, Kirfel G. Release of integrin macroaggregates as a mechanism of rear detachment during keratinocyte migration. Eur J Cell Biol 2005; 83:725-33. [PMID: 15679117 DOI: 10.1078/0171-9335-00431] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cell-substrate adhesion can be mediated by the relatively short-lived focal complexes and focal adhesions and by the more stable hemidesmosomes. During cell migration both types of cell-substrate adhesions must be disrupted allowing the cell rear to detach. Rear detachment has been described to be accompanied by membrane ripping and the loss of cellular material in a variety of cell types including fibroblasts and chondrocytes, but also in fast moving cells such as keratinocytes. Here we show that migrating keratinocytes leave behind "migration tracks" of cellular remnants that can be classified due to their size, distribution and molecular composition. Type I macroaggregates appeared as spherical and tubular structures with a diameter of about 50-100 nm that were arranged like "pearls on a string". These structures apparently derived from fragmentation of long tubular extensions, the retracting fibers, at the cell rear and contained high amounts of beta1 integrin and different alpha integrins that are components of fibronectin and laminin receptors in migrating keratinocytes usually found in focal adhesions. Type II macroaggregates were recognized as spherical structures with a diameter of about 30 - 50 nm that were arranged in clusters scattered over the gaps between type I, macroaggregates. In contrast to type I type II macroaggregates contained high amounts of beta4 integrin and seemed to derive from former hemidesmosomes. Both types of macroaggregates were completely membrane covered, impermeable compartments devoid of cytosolic proteins. Our observations strongly support the concept that the release of macroaggregates represents a distinct cellular mechanism of rear detachment based on the loss of adhesive receptors embedded in membrane-covered cellular remnants.
Collapse
|
18
|
Diaz LK, Zhou X, Welch K, Sahin A, Gilcrease MZ. Chromogenic in situ hybridization for alpha6beta4 integrin in breast cancer: correlation with protein expression. J Mol Diagn 2004; 6:10-5. [PMID: 14736821 PMCID: PMC1867466 DOI: 10.1016/s1525-1578(10)60485-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The alpha6beta4 integrin is the receptor for the basement membrane protein laminin-5. Recent studies suggest that alpha6beta4 integrin expression in invasive breast carcinomas may be a poor prognostic factor. Because we have not had reliable results with commercially available antibodies for the immunohistochemical detection of alpha6beta4 integrin in archival paraffin-embedded tissues, we designed a probe to detect beta4 integrin subunit mRNA in paraffin sections. In situ hybridization for beta4 mRNA was performed on paraffin-embedded tissue sections of 25 invasive breast carcinomas using a hyperbiotinylated oligonucleotide DNA probe. Immunohistochemical staining was performed on corresponding frozen tumor sections using two commercially available antibodies to the beta4 integrin subunit. All cases positive for beta4 protein by one or both antibodies were also positive for beta4 mRNA by in situ hybridization, but three cases with beta4 mRNA expression were negative by immunohistochemistry with both antibodies. These findings suggest that in situ hybridization appears to be a sensitive method for detecting beta4 integrin mRNA, but it appears to identify some cases that either lack beta4 protein or express variants not recognized with commercial antibodies directed to particular extracellular or cytoplasmic domains.
Collapse
Affiliation(s)
- Leslie K Diaz
- Department of Pathology, MD Anderson Cancer Center, Houston, Texas 77030, USA
| | | | | | | | | |
Collapse
|
19
|
Modolo F, Martins MT, Loducca SVL, de Araújo VC. Expression of integrin subunits alpha2, alpha3, alpha5, alphav, beta1, beta3 and beta4 in different histological types of ameloblastoma compared with dental germ, dental lamina and adult lining epithelium. Oral Dis 2004; 10:277-82. [PMID: 15315644 DOI: 10.1111/j.1601-0825.2004.01028.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To analyze integrin expression and distribution in different histological types of ameloblastoma, compared with dental germ, dental lamina and adult lining epithelium. MATERIALS AND METHODS Three-micrometer sections from paraffin-embedded specimens were evaluated employing a streptavidin-biotin immunohistochemical method and anti-integrin alpha2, alpha3, alpha5, alphav, beta1, beta3 and beta4 antibodies. RESULTS All integrins were present in all specimens, exhibiting different patterns. In follicular ameloblastoma, the integrin staining was stronger in the periphery while integrin alpha2 was not present in the central cells. Acanthomatous ameloblastoma showed a similar pattern, with positive staining for integrins alpha3, alpha5, alphav, beta1 and beta4 in the metaplastic cells. In the unicystic, integrin staining was uniform except for integrins alpha5 and beta3 which showed weaker staining in the upper layers. In the plexiform ameloblastoma, dental germ and lamina integrin staining was uniform. In the adult lining epithelium, staining for integrins alpha2, alpha5 and beta4 was confined to the basal layer, while integrins alphav and beta3 were present in the basal and parabasal, with integrins alpha3 and beta1 in the upper layers. CONCLUSION Acanthomatous, follicular and unicystic ameloblastomas showed integrin staining patterns similar to the adult lining epithelium while the plexiform ameloblastoma was similar to the dental germ and lamina.
Collapse
Affiliation(s)
- F Modolo
- Department of Oral Pathology, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | | | | | | |
Collapse
|
20
|
Abstract
In this study, we investigated the profile of integrin expression in human and porcine intervertebral disc tissue. Differences in extracellular matrix composition between anulus fibrosus (AF) and nucleus pulposus (NP) regions of the disc, as well as differences in cellular responses to environmental stimuli, suggest a role for integrins in presenting matrix signals that may mediate these responses. Human disc tissue and porcine AF and NP tissue were stained with antibodies to alpha integrin subunits 1-6, V and IIb, and beta integrin subunits 1-6 and graded for evidence of positive staining on a scale from 0 (no staining) to 3 (high incidence of staining). Human tissue expressed alpha and beta integrin subunits shown to be present in articular cartilage, including alpha(1), alpha(5) and alpha(V). Porcine AF tissue expressed similar integrin subunits to human disc, with both expressing alpha(1), alpha(5), beta(1), beta(3) and beta(5) subunits, whereas porcine NP tissue expressed higher levels of alpha(6), beta(1) and beta(4) than AF tissue. The expressed subunits are known to interact with proteins including collagens, fibronectin and laminin; however, additional studies will be required to characterize the interactions of the integrin subunits with specific matrix constituents, as well as their specific involvement in regulating environmental stimuli.
Collapse
Affiliation(s)
- Dana L Nettles
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | | | | |
Collapse
|