1
|
Al Habobe H, Haverkort EB, Nazmi K, Van Splunter AP, Pieters RHH, Bikker FJ. The impact of saliva collection methods on measured salivary biomarker levels. Clin Chim Acta 2024; 552:117628. [PMID: 37931731 DOI: 10.1016/j.cca.2023.117628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 11/01/2023] [Accepted: 11/01/2023] [Indexed: 11/08/2023]
Abstract
Saliva diagnostics have become increasingly popular due to their non-invasive nature and patient-friendly collection process. Various collection methods are available, yet these are not always well standardized for either quantitative or qualitative analysis. In line, the objective of this study was to evaluate if measured levels of various biomarkers in the saliva of healthy individuals were affected by three distinct saliva collection methods: 1) unstimulated saliva, 2) chew stimulated saliva, and 3) oral rinse. Saliva samples from 30 healthy individuals were obtained by the three collection methods. Then, the levels of various salivary biomarkers such as proteins and ions were determined. It was found that levels of various biomarkers obtained from unstimulated saliva were comparable to those in chew stimulated saliva. The levels of potassium, sodium, and amylase activity differed significantly among the three collection methods. Levels of all biomarkers measured using the oral rinse method significantly differed from those obtained from unstimulated and chew-stimulated saliva. In conclusion, both unstimulated and chew-stimulated saliva provided comparable levels for a diverse group of biomarkers. However, the results obtained from the oral rinse method significantly differed from those of unstimulated and chew-stimulated saliva, due to the diluted nature of the saliva extract.
Collapse
Affiliation(s)
- H Al Habobe
- Research Group Innovative Testing in Life Sciences and Chemistry, Research Centre for Healthy and Sustainable Living, University of Applied Sciences Utrecht, The Netherlands; Institute for Risk Assessment Sciences, Faculty of Veterinary Medicines, Utrecht University, The Netherlands; Dept of Oral Biochemistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands.
| | - E B Haverkort
- Research Group Innovations in Preventive Care, Utrecht University of Applied Sciences, The Netherlands
| | - K Nazmi
- Dept of Oral Biochemistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands
| | - A P Van Splunter
- Dept of Oral Biochemistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands
| | - R H H Pieters
- Research Group Innovative Testing in Life Sciences and Chemistry, Research Centre for Healthy and Sustainable Living, University of Applied Sciences Utrecht, The Netherlands; Institute for Risk Assessment Sciences, Faculty of Veterinary Medicines, Utrecht University, The Netherlands
| | - F J Bikker
- Dept of Oral Biochemistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands
| |
Collapse
|
2
|
A Kaleidoscope of Keratin Gene Expression and the Mosaic of Its Regulatory Mechanisms. Int J Mol Sci 2023; 24:ijms24065603. [PMID: 36982676 PMCID: PMC10052683 DOI: 10.3390/ijms24065603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/07/2023] [Accepted: 03/10/2023] [Indexed: 03/17/2023] Open
Abstract
Keratins are a family of intermediate filament-forming proteins highly specific to epithelial cells. A combination of expressed keratin genes is a defining property of the epithelium belonging to a certain type, organ/tissue, cell differentiation potential, and at normal or pathological conditions. In a variety of processes such as differentiation and maturation, as well as during acute or chronic injury and malignant transformation, keratin expression undergoes switching: an initial keratin profile changes accordingly to changed cell functions and location within a tissue as well as other parameters of cellular phenotype and physiology. Tight control of keratin expression implies the presence of complex regulatory landscapes within the keratin gene loci. Here, we highlight patterns of keratin expression in different biological conditions and summarize disparate data on mechanisms controlling keratin expression at the level of genomic regulatory elements, transcription factors (TFs), and chromatin spatial structure.
Collapse
|
3
|
Peters K, Wiesmann N, Heimes D, Schwab R, Kämmerer PW, Al-Nawas B, Unger RE, Hasenburg A, Brenner W. Extracorporeal Shock Wave Therapy Improves In Vitro Formation of Multilayered Epithelium of Oral Mucosa Equivalents. Biomedicines 2022; 10:biomedicines10030700. [PMID: 35327502 PMCID: PMC8945876 DOI: 10.3390/biomedicines10030700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/14/2022] [Accepted: 03/17/2022] [Indexed: 11/16/2022] Open
Abstract
Oral mucosa is used in various surgical fields as a graft for the reconstruction of tissue defects. Tissue engineering of oral mucosa equivalents using autologous cells represents a suitable less burdensome alternative. The survival of the multilayered epithelium is essential for the functionality of the tissues in vivo. To ensure its functionality after transplantation, mucosa equivalents in vitro were subjected to extracorporeal shock wave therapy (ESWT) to determine whether this treatment stimulated the formation and differentiation of the epithelium. Mucosa equivalents treated with ESWT were examined for cellular metabolic activity using AlamarBlueTM assay. The formation of vascular structures, basement membrane, and multilayered epithelium were examined using confocal fluorescence microscopy and immunohistochemistry. The potential ingrowth in vivo was simulated using the chorioallantoic membrane model (CAM assay) in ovo. ESWT on culture day 19 of oral mucosa equivalents resulted in slightly increased cellular metabolic activity. The in vitro development of basement membrane and multilayer epithelium was stimulated by ESWT. Additionally, in the CAM assay, ESWT led to a more pronounced multilayered epithelium. Thus, ESWT stimulated the formation of a more distinct and differentiated multilayered epithelium of oral mucosa equivalents in vitro and might increase the chance of efficient ingrowth, survival, and functionality of tissue equivalents in vivo.
Collapse
Affiliation(s)
- Katharina Peters
- Department of Obstetrics and Gynecology, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (K.P.); (R.S.); (A.H.)
| | - Nadine Wiesmann
- Department of Oral and Maxillofacial and Plastic Surgery, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (N.W.); (D.H.); (P.W.K.); (B.A.-N.)
- Department of Otorhinolaryngology, Head and Neck Surgery, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
| | - Diana Heimes
- Department of Oral and Maxillofacial and Plastic Surgery, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (N.W.); (D.H.); (P.W.K.); (B.A.-N.)
| | - Roxana Schwab
- Department of Obstetrics and Gynecology, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (K.P.); (R.S.); (A.H.)
| | - Peer W. Kämmerer
- Department of Oral and Maxillofacial and Plastic Surgery, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (N.W.); (D.H.); (P.W.K.); (B.A.-N.)
| | - Bilal Al-Nawas
- Department of Oral and Maxillofacial and Plastic Surgery, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (N.W.); (D.H.); (P.W.K.); (B.A.-N.)
| | - Ronald E. Unger
- Institute of Pathology, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany;
| | - Annette Hasenburg
- Department of Obstetrics and Gynecology, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (K.P.); (R.S.); (A.H.)
| | - Walburgis Brenner
- Department of Obstetrics and Gynecology, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (K.P.); (R.S.); (A.H.)
- Correspondence: ; Tel.: +49-6131-17-2740
| |
Collapse
|
4
|
Combined proteomic and transcriptomic approaches reveal externalized keratin 8 as a potential therapeutic target involved in invasiveness of head and neck cancers. Transl Oncol 2020; 14:100878. [PMID: 33010552 PMCID: PMC7530345 DOI: 10.1016/j.tranon.2020.100878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 06/29/2020] [Indexed: 12/24/2022] Open
Abstract
Keratin 8 (K8) expressed at the surface of cancer cells, referred as externalized K8 (eK8), has been observed in a variety of carcinoma cell lines. K8 has been previously reported to be expressed in poorly differentiated head and neck squamous cell carcinoma (HNSCC); however, its role during the invasive phase of upper aerodigestive tract tumorigenesis is unknown. Cohorts of HNSCC tumors for protein and mRNA expression and panel of cell lines were used for investigation. K8 was found to be externalized in a majority of HNSCC cell lines. Among the two main K8 protein isoforms only the 54 kDa was found to be present at the plasma membrane of HNSCC cells. The plasminogen-induced invasion of HNSCC cells was inhibited by the anti-eK8 D-A10 antagonist monoclonal antibody. Overexpression of K8 mRNA and protein were both correlated with tumor aggressive features and poor outcome. The effect of eK8 neutralization on invasion, its presence exclusively in cancer cells and the association of K8 expression with aggressive features and poor clinical outcome in HNSCC unravel eK8 as key player in invasion and a promising therapeutic target in HNSCC.
Collapse
|
5
|
Ozaki A, Otani T, Kitagawa N, Ogata K, Iida H, Kojima H, Inai T. Serum affects keratinization and tight junctions in three-dimensional cultures of the mouse keratinocyte cell line COCA through retinoic acid receptor-mediated signaling. Histochem Cell Biol 2018; 151:315-326. [DOI: 10.1007/s00418-018-1741-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/09/2018] [Indexed: 01/15/2023]
|
6
|
Anisomycin, a JNK and p38 activator, suppresses cell-cell junction formation in 2D cultures of K38 mouse keratinocyte cells and reduces claudin-7 expression, with an increase of paracellular permeability in 3D cultures. Histochem Cell Biol 2018; 151:369-384. [PMID: 30284609 DOI: 10.1007/s00418-018-1736-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2018] [Indexed: 01/28/2023]
Abstract
Keratinocytes in the oral mucosal epithelium, which is a non-keratinized stratified epithelium, are exposed to various stimuli from the oral cavity. JNK and p38 are stress-activated mitogen-activated protein kinases (MAPKs) that are phosphorylated by various stimuli and are involved in the assembly and disassembly of tight junctions (TJs) in keratinocytes. Therefore, we investigated the effects of stress-activated MAPKs on TJs in a mouse keratinocyte cell line during cell-cell junction formation in two-dimensional (2D) cultures or stratification to form non-keratinized epithelium in 3D cultures. In 2D cultures, calcium induced zipper-like staining for ZO-1 at 2 h and string-like staining for ZO-1 at 12 h, which indicated immature and mature cell-cell junctions, respectively. Anisomycin (AM), a JNK and p38 activator, inhibited formation of string-like staining for ZO-1, whereas inhibition of JNK, but not p38, after AM treatment restored string-like staining for ZO-1, although claudins (CLDNs) 4, 6, and 7 did not completely colocalize to ZO-1-positive sites. In 3D cultures, AM treatment for 2 weeks activated only p38, suppressed flattening of the superficial cells, removed CLDN7 from ZO-1-positive spots on the surface of 3D cultures, which represent TJs, and decreased transepithelial electrical resistance. Thus, short-term AM treatment inhibited maturation of cell-cell junctions by JNK, but not p38, activation. p38 activation by long-term AM treatment affected morphology of stratified structures and paracellular permeability, which was increased by CLDN7 removal from TJs. Various chronic stimuli that activate stress-activated MAPKs may weaken the keratinocyte barrier and be involved in TJ-related diseases.
Collapse
|
7
|
Abstract
Although the surfaces of both the skin and oral mucosa are protected by squamous epithelial cells and fall within the scope of dermatologic practice, the oral cavity contains highly specialized structures and functions distinct from other skin biology and pathologic conditions and are also the purview of clinicians who care for patients with skin and mucosal diseases. We describe the distinct features of the tongue, mucosa, and salivary glands. In particular, we examine the composition and function of the saliva, with special focus on salivary biomarkers. Within the oral cavity, saliva shows great promise as a noninvasive and sensitive marker for many systemic diseases. Biomarkers are being used as diagnostic or monitoring tools for a wide variety of diseases, including systemic lupus erythematosus, Sjögren disease, Behçet disease, and autoimmune blistering disorders, as well as premalignant and malignant lesions of the mouth.
Collapse
|
8
|
Li S, Ge S, Yang P. Expression of cytokeratins in enamel organ, junctional epithelium and epithelial cell rests of Malassez. J Periodontal Res 2015; 50:846-54. [PMID: 25808290 DOI: 10.1111/jre.12272] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/20/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND OBJECTIVE After tooth formation is complete, it is suggested that continuity exists between the epithelial cell rests of Malassez (ERM), reduced enamel epithelium (REE) and subsequently the junctional epithelium. However, the junctional epithelium was reported to differ from REE and ERM. The developmental relationships between and among them remain controversial. Therefore, in the present study we examined the expression of cytokeratins in the three types of epithelia to investigate the epithelial phenotypes. MATERIAL AND METHODS The maxillae of Wistar rats, 1, 2, 3 and 7 wk of age, were used, and the expression of CK14, CK17, CK19, CK10/CK13 and AE1/AE3 was detected using immunoperoxidase techniques. RESULTS There was negative staining for CK10/CK13 in all the epithelia. ERM stained strongly for AE1/AE3, CK14, CK17 and CK19. During the transformation of inner enamel epithelial (IEE) cells into reduced ameloblasts and subsequently into junctional epithelium, strong staining for CK14 was evident in IEE, REE and junctional epithelium, whereas the expression of AE1/AE3 and of CK19 were initially negative in IEE and then strong in REE and junctional epithelium, respectively. In particular, the expression of CK17 was strongly positive in ERM and REE, but was negative in IEE and junctional epithelium. CONCLUSION ERM are of odontogenic origin and junctional epithelium has an epithelial phenotype different from REE and ERM. This is the first report to demonstrate that CK17 can be used as a marker to distinguish junctional epithelium from ERM.
Collapse
Affiliation(s)
- S Li
- Shandong Provincial Key Laboratory of Oral Biomedicine, School and Hospital of Stomatology, Shandong University, Jinan, Shandong Province, China
| | - S Ge
- Shandong Provincial Key Laboratory of Oral Biomedicine, School and Hospital of Stomatology, Shandong University, Jinan, Shandong Province, China.,Department of Periodontology, Hospital of Stomatology, Shandong University, Jinan, Shandong Province, China
| | - P Yang
- Shandong Provincial Key Laboratory of Oral Biomedicine, School and Hospital of Stomatology, Shandong University, Jinan, Shandong Province, China.,Department of Periodontology, Hospital of Stomatology, Shandong University, Jinan, Shandong Province, China
| |
Collapse
|
9
|
Dormancy activation mechanism of oral cavity cancer stem cells. Tumour Biol 2015; 36:5551-9. [PMID: 25722113 DOI: 10.1007/s13277-015-3225-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Accepted: 02/04/2015] [Indexed: 12/12/2022] Open
Abstract
Radiotherapy and chemotherapy are targeted primarily at rapidly proliferating cancer cells and are unable to eliminate cancer stem cells in the G0 phase. Thus, these treatments cannot prevent the recurrence and metastasis of cancer. Understanding the mechanisms by which cancer stem cells are maintained in the dormant G0 phase, and how they become active is key to developing new cancer therapies. The current study found that the anti-cancer drug 5-fluorouracil, acting on the oral squamous cell carcinoma KB cell line, selectively killed proliferating cells while sparing cells in the G0 phase. Bisulfite sequencing PCR showed that demethylation of the Sox2 promoter led to the expression of Sox2. This then resulted in the transformation of cancer stem cells from the G0 phase to the division stage and suggested that the transformation of cancer stem cells from the G0 phase to the division stage is closely related to an epigenetic modification of the cell.
Collapse
|
10
|
Jones KB, Klein OD. Oral epithelial stem cells in tissue maintenance and disease: the first steps in a long journey. Int J Oral Sci 2013; 5:121-9. [PMID: 23887128 PMCID: PMC3967329 DOI: 10.1038/ijos.2013.46] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Accepted: 06/08/2013] [Indexed: 12/11/2022] Open
Abstract
The identification and characterization of stem cells is a major focus of developmental biology and regenerative medicine. The advent of genetic inducible fate mapping techniques has made it possible to precisely label specific cell populations and to follow their progeny over time. When combined with advanced mathematical and statistical methods, stem cell division dynamics can be studied in new and exciting ways. Despite advances in a number of tissues, relatively little attention has been paid to stem cells in the oral epithelium. This review will focus on current knowledge about adult oral epithelial stem cells, paradigms in other epithelial stem cell systems that could facilitate new discoveries in this area and the potential roles of epithelial stem cells in oral disease.
Collapse
Affiliation(s)
- Kyle B Jones
- Program in Craniofacial and Mesenchymal Biology, University of California, San Francisco, San Francisco, USA
| | | |
Collapse
|
11
|
Nerkar PP, Gattani SG. Cress seed mucilage based buccal mucoadhesive gel of venlafaxine: in vivo, in vitro evaluation. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:771-779. [PMID: 22203515 DOI: 10.1007/s10856-011-4529-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Accepted: 12/09/2011] [Indexed: 05/31/2023]
Abstract
Venlafaxine is a newer antipsychotic drug which shows first pass effect. Cress seed is also called as garden cress or green salad. This study examined the mechanical (gel strength, adhesiveness) and rheological properties of cress seed mucilage based gels that contain different ratios of carbopol 934 P (0.5-1.5%). In addition, diffusion of venlafaxine from gel formulations was evaluated. The selected formulation was further analyzed for pharmacokinetic parameters in rabbits. All formulations exhibited pseudoplastic flow with thixotropy. Formulation F5 showed the C(max) of 24.19 ± 0.72 ng/ml by buccal route of administration and 17.98 ± 1.15 ng/ml by oral route of administration. The bioavailability of F5 by buccal route was 54.44% and that of by oral route was 39.60%. A combination of the cress seed mucilage and carbopol 934 P resulted in a prolonged and higher venlafaxine delivery by buccal route of administration.
Collapse
Affiliation(s)
- Pankaj Padmakar Nerkar
- Department of Pharmaceutics, RC Patel Institute of Pharmaceutical Education & Research, Dist-Dhule, Shirpur, Maharashtra, India.
| | | |
Collapse
|
12
|
Iwasaki SI, Aoyagi H, Yoshizawa H. Localization of keratins 13 and 14 in the lingual mucosa of rats during the morphogenesis of circumvallate papillae. Acta Histochem 2011; 113:395-401. [PMID: 20546859 DOI: 10.1016/j.acthis.2010.03.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2010] [Revised: 03/03/2010] [Accepted: 03/04/2010] [Indexed: 11/28/2022]
Abstract
We used fluorescence immunohistochemistry, analysis of differential interference contrast (DIC) images and confocal laser-scanning microscopy in the transmission mode, after staining specimens with toluidine blue, to examine the localization of keratin 13 (K13) and keratin 14 (K14) in the lingual epithelium of fetal and juvenile Sprague-Dawley rats during the prenatal and postnatal morphogenesis of circumvallate papillae. No immunoreactivity specific for K13 and K14 was detected in the lingual epithelium of fetuses on day 15 after conception (E15), at which time the primitive rudiment of the circumvallate papillae was detectable by the thickening of several layers of cuboidal epithelial cells. On E17 and E19, the developing circumvallate papillae were clearly recognizable, consisting of a central papilla and the surrounding sulcus. No immunoreactivity specific for K13 and K14 was evident in the lingual epithelium around these structures at this time. K14-specific immunoreactivity was first detected in the basal layer of the epithelium of the circumvallate papillae on postnatal day 0 (P0) and K13-specific immunoreactivity was detected on P7. Morphogenesis of the circumvallate papillae progressed significantly from P0 to P14, and immunoreactivity specific for K13 and K14 was clearly recognizable after P7. The respective patterns of K13-specific and K14-specific immunoreactivity differed during the development of the circumvallate papillae: K13-specific immunoreactivity was generally evident in cells of the intermediate layer of the epithelium, while K14-specific immunoreactivity was detected in cells of the basal and suprabasal layers. The present results are discussed in the context of the previously determined localization of K13 and K14 in the dorsal epithelium of the anterior part of the rat tongue during its morphogenesis.
Collapse
Affiliation(s)
- Shin-ichi Iwasaki
- Advanced Research Center, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata 951-8580, Japan.
| | | | | |
Collapse
|
13
|
Hosoya A, Kwak S, Kim EJ, Lunny DP, Lane EB, Cho SW, Jung HS. Immunohistochemical localization of cytokeratins in the junctional region of ectoderm and endoderm. Anat Rec (Hoboken) 2011; 293:1864-72. [PMID: 20818615 DOI: 10.1002/ar.21233] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Although tridermic species have two junctional regions of ectoderm and endoderm between their epidermis and digestive tract, we actually know little about these particular boundaries. Cytokeratins are the major intermediate filaments of epithelial cells and show a high degree of tissue specificity. Therefore, to characterize the epithelial cells in the junctional region of ectoderm and endoderm, we immunohistochemically examined the localization of cytokeratins 5, 7/17, 14, 18, Sox17, and alpha-fetoprotein (AFP) in the oropharyngeal and anorectal regions during the mouse gastrulation process. At embryonic day (E) 9.5, cytokeratins 5, 7/17, 14, and 18 were detected in all epithelial cells of the oropharyngeal region. At E12.5, cytokeratin 5-positive cells were not observed in the middle area of the oral cavity; however, the immunoreactivity was strong in the anterior and posterior areas. The immunoreaction of cytokeratins 18 was seen only in the middle and posterior areas of the oral mucosa. Cytokeratins 7/17 and 14 were localized in all areas of the oropharyngeal region. Sox17 and AFP, which are endodermal markers, were detected in the middle and posterior areas of the oral mucosa, but not in the anterior area. Moreover, this same localization pattern of cytokeratins also existed in the anorectal region of the E12.5 embryo, suggesting that the localization of cytokeratins and endodermal markers might give an implication for the boundary between ectoderm and endoderm. These results also suggest that these cytokeratins are useful molecules for monitoring the epithelial cell differentiation in the junctional region of the germ layers.
Collapse
Affiliation(s)
- Akihiro Hosoya
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Research Center for Orofacial Hard Tissue Regeneration, Brain Korea 21 Project, Yonsei University College of Dentistry, Seoul, Republic of Korea
| | | | | | | | | | | | | |
Collapse
|
14
|
Iwasaki SI, Aoyagi H. Fluorescence immunohistochemistry in combination with differential interference contrast microscopy for studies of semi-ultrathin specimens of epoxy resin-embedded samples. Methods Mol Biol 2011; 689:229-240. [PMID: 21153796 DOI: 10.1007/978-1-60761-950-5_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have developed a technique, using a combination of immunofluorescent staining of semi-ultrathin sections of epoxy resin-embedded samples and the corresponding differential interference contrast (DIC) images obtained by light microscopy that provides detailed information about the immuno-localization of histological and cellular structures. To demonstrate the effectiveness of our method, we examined the immunofluorescence of immuno-stained keratin 13 (K13) and type III collagen (CIII) and the corresponding DIC images during the morphogenesis of filiform papillae on the rat tongue. Immunoreactivity specific for K13 and CIII was detected on the lingual epithelium of juveniles on postnatal days 7 and 14 (P7 and P14). The immunoreactivity specific for K13 was clearly located in the intermediate-layer cells of the interpapillary cell columns, while that specific for CIII was also distinct in the connective-tissue fibers between the lingual epithelium and the lingual muscle. The DIC images revealed the keratinization of the stratified squamous cells of the lingual epithelium and, also, myogenesis beneath the connective tissue. In addition, immunoreactivity specific for CIII was also recognizable in the endomysium and perimysium around the lingual muscle. Thus, our method demonstrated changes in patterns of immunoreactivity of K13 and of CIII during the morphogenesis of the rat tongue.
Collapse
Affiliation(s)
- Shin-Ichi Iwasaki
- Advanced Research Center, School of Life Dentistry at Niigata, The Nippon Dental University, Niigata, Japan.
| | | |
Collapse
|
15
|
Aoyagi H, Asami T, Yoshizawa H, Wanichanon C, Iwasaki SI. Newly developed technique for dual localization of keratins 13 and 14 by fluorescence immunohistochemistry. Acta Histochem 2008; 110:324-32. [PMID: 18262229 DOI: 10.1016/j.acthis.2007.11.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2007] [Revised: 11/16/2007] [Accepted: 11/16/2007] [Indexed: 10/22/2022]
Abstract
It is difficult to visualize histological details on semi-ultrathin sections by light microscopy after immunohistochemical labeling because the histological structures in such sections cannot be distinguished by standard counterstaining. To solve this problem and to visualize the immunoreactivity of keratins 13 (K13) and 14 (K14), we used a newly developed technique for dual localization of antigens by fluorescence immunohistochemistry and confocal laser-scanning microscopy in transmission mode, after staining specimens with toluidine blue. Using this approach, we examined the immunolocalization of K13 and K14 on the lingual epithelium of fetal and juvenile rats by immunofluorescence while monitoring morphological changes in the filiform papillae by laser-scanning microscopy, in transmission mode, of the same sections. No K13 and K14 immunoreactivity was detected on the lingual epithelium of fetuses on day 15 after conception (E15), at which time the lingual epithelium was composed of a few layers of cuboidal cells. K14 immunoreactivity was first detected on the lingual epithelium of fetuses on E17 and K13 immunoreactivity on E19. The number of layers of cuboidal cells in the lingual epithelium also increased from E17 to E19. K13 and K14 immunoreactivity was distinct at all postnatal stages examined. Although the respective patterns of K13 and K14 immunoreactivity differed as the filiform papillae developed, K13 immunoreactivity was generally evident in the suprabasal cells of the interpapillary cell columns and K14 immunoreactivity was detected in the basal and suprabasal cells of the papillary and interpapillary cell columns. Our newly developed technique for dual localization of antigens should be useful for investigations of very small specimens, such as fetal tissues and organs.
Collapse
|
16
|
Troy TC, Arabzadeh A, Yerlikaya S, Turksen K. Claudin immunolocalization in neonatal mouse epithelial tissues. Cell Tissue Res 2007; 330:381-8. [PMID: 17828607 DOI: 10.1007/s00441-007-0487-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2007] [Accepted: 07/25/2007] [Indexed: 12/14/2022]
Abstract
Emerging evidence supports the notion that claudins (Cldns) are dynamically regulated under normal conditions to respond to the selective permeability requirements of various tissues, and that their expression is developmentally controlled. We describe the localization of those Cldns that we have previously demonstrated to be functionally important in epidermal differentiation and the formation of the epidermal permeability barrier, e.g., Cldn1, Cldn6, Cldn11, and Cldn18, and the presence of Cldn3 and Cldn5 in various neonatal mouse epithelia including the epidermis, nail, oral mucosa, tongue, and stomach. Cldn1 is localized in the differentiated and/or undifferentiated compartments of the epidermis and nail and in the dorsal surface of the tongue and glandular compartment of the stomach but is absent from the oral mucosa and the keratinized compartment of the stomach. Cldn3 is present in the basal cells of the nail matrix and both compartments of the murine stomach but not in the epidermis, oral mucosa, or tongue. Cldn5 is found in the glandular compartment of the stomach but not in the epidermis, nail unit, oral mucosa, forestomach, and tongue. Cldn6, Cldn11, and Cldn18 occur in the differentiating suprabasal compartment of the epidermis, nail, and oral mucosa and in the dorsal and ventral surfaces of the tongue and the keratinized squamous epithelium of the stomach. The simple columnar epithelium of the glandular stomach stains for Cldn18 and reveals a non-membranous pattern for Cldn6 and Cldn11 expression. Our results demonstrate differential Cldn protein profiles in various epithelial tissues and their differentiation stages. Although the molecular mechanisms regulating Cldn expression are unknown, elucidation of their differential localization patterns in tissues with diverse permeability requirements should provide a better understanding of the role of tight junctions in tissue function.
Collapse
Affiliation(s)
- Tammy-Claire Troy
- Ottawa Health Research Institute, 725 Parkdale Avenue, Ottawa, ON, K1Y 4E9, Canada
| | | | | | | |
Collapse
|
17
|
Honardoust HA, Jiang G, Koivisto L, Wienke D, Isacke CM, Larjava H, Häkkinen L. Expression of Endo180 is spatially and temporally regulated during wound healing. Histopathology 2006; 49:634-48. [PMID: 17163848 DOI: 10.1111/j.1365-2559.2006.02559.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIMS Interactions of cells with the extracellular matrix are important for normal wound healing and may play a role in scar formation. Remarkably, wound healing in human gingiva does not result in scar formation and serves as a model for wound regeneration. Endo180 (CD280) is a cell surface receptor that has novel functions to regulate cell migration and bind and internalize collagens that are key processes in wound healing. The aim of this study was to examine the expression of Endo180 during gingival wound regeneration. METHODS AND RESULTS Biopsies were collected from normal human gingiva and 1-60 days after wounding and expression of Endo180 was analysed by immunostaining. Expression of Endo180 by cultured fibroblasts and keratinocytes was studied by immunoblotting and semiquantitative reverse transcriptase-polymerase chain reaction. In normal gingiva, Endo180 was expressed by basal epithelial cells, fibroblasts, myofibroblasts, pericytes, macrophages and endothelial cells. In wounds, Endo180 expression was spatiotemporally increased in the migrating and differentiating wound epithelium, in subsets of myofibroblasts, pericytes, macrophages and endothelial cells. Growth factors involved in wound healing up-regulated the expression of Endo180 in keratinocytes and fibroblasts. CONCLUSIONS The findings suggest that Endo180 plays a role in re-epithelialization and connective tissue remodelling during wound regeneration.
Collapse
Affiliation(s)
- H A Honardoust
- Department of Oral Biological and Medical Sciences, University of British Columbia, Vancouver, BC, Canada
| | | | | | | | | | | | | |
Collapse
|
18
|
Iwasaki SI, Aoyagi H, Asami T. Expression of keratin 18 in the periderm cells of the lingual epithelium of fetal rats: visualization by fluorescence immunohistochemistry and differential interference contrast microscopy. Odontology 2006; 94:64-8. [PMID: 16998620 DOI: 10.1007/s10266-005-0059-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Accepted: 12/15/2005] [Indexed: 11/26/2022]
Abstract
We examined the expression of keratin 18 (K18), by immunofluorescence staining, while monitoring morphological changes in the periderm on the lingual epithelium of rats by laser-scanning microscopy of epoxy resin-embedded, semi-ultrathin sections. We also examined differential interference contrast (DIC) images of the same sections to define the histology and morphology of the cells. It is difficult to visualize histological details of the fetal lingual epithelium of the rat on semi-ultrathin sections by light microscopy after immunohistochemical staining, because the histological structures in such sections cannot be distinguished by standard counterstaining. To solve this problem and to visualize keratin 18 (K18), we used a combination of immunofluorescence staining of semi-ultrathin sections and corresponding differential contrast (DIC) images, obtained by laser-scanning microscopy.
Collapse
Affiliation(s)
- Shin-ichi Iwasaki
- Advanced Research Center, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Niigata 951-8580, Japan.
| | | | | |
Collapse
|
19
|
Iwasaki SI, Yoshizawa H, Aoyagi H. Immunohistochemical expression of keratins 13 and 14 in the lingual epithelium of rats during the morphogenesis of filiform papillae. Arch Oral Biol 2005; 51:416-26. [PMID: 16271699 DOI: 10.1016/j.archoralbio.2005.09.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2005] [Revised: 09/14/2005] [Accepted: 09/28/2005] [Indexed: 10/25/2022]
Abstract
We examined the immunofluorescence of keratins 13 (K13) and 14 (K14) and differential interference contrast (DIC) images during the morphogenesis of filiform papillae and the keratinization of the lingual epithelium of rats on semi-ultrathin sections of epoxy resin-embedded samples by laser-scanning microscopy. We also examined semi-ultrathin sections of epoxy resin embedded, toluidine blue stained samples by light microscopy to obtain details of cell histology and morphology. No immunoreactivity specific for K13 and K14 was detected on the lingual epithelium of foetuses on days 13, 15 and 17 after conception (E13, E15 and E17), during which time the number of layers of cuboidal cells in the lingual epithelium increased from one to several. Immunoreactivity specific for K13 and K14 was first detected on the lingual epithelium of foetuses on E19. The immunoreactivity specific for K13 appeared in the suprabasal cells of the papillary and interpapillary cell columns and immunoreactivity specific for K14 was detected in the basal and suprabasal cells of the papillary and interpapillary cell columns. The lingual epithelium was composed of stratified squamous cells. The rudiments of filiform papillae were compactly arranged and interpapillary cell columns were very narrow. Filiform papillae developed gradually from postnatal day 0 (PO) to 21 (P21). The width of interpapillary spaces also increased during this period. Immunoreactivity specific for K13 and K14 was distinct at all postnatal stages examined. Thus, the patterns of immunoreactivity of K13 and K14 differed as the filiform papillae developed.
Collapse
Affiliation(s)
- Shin-ichi Iwasaki
- Advanced Research Center, The Nippon Dental University School of Dentistry at Niigata, 1-8 Hamaura-cho, Niigata 951-8580, Japan.
| | | | | |
Collapse
|
20
|
Barrett AW, Cort EM, Patel P, Berkovitz BK. An immunohistological study of cytokeratin 20 in human and mammalian oral epithelium. Arch Oral Biol 2000; 45:879-87. [PMID: 10973561 DOI: 10.1016/s0003-9969(00)00050-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Cytokeratin (CK) 20 is a low molecular-weight intermediate filament reportedly expressed only by benign and malignant gastrointestinal epithelium, urothelium and Merkel cells. The main aims here were to map its expression in normal oral mucosa of humans and other mammals, and to determine whether it was expressed by abnormal human oral epithelium. Salivary and odontogenic epithelium were also analysed. An immunoperoxidase method was used on wax-embedded and cryostat sections. In addition, double-labelling experiments were undertaken to determine the association between CK 20 expression and that of CK 8/18 or S100 protein. Normal human oral mucosa from four sites, together with abdominal skin, was studied in autopsy samples from 32 individuals. CK 20-positive, basally situated, round or angular cells, consistent with Merkel cells, were recorded in 24/32 (75.0%) samples of mandibular gingiva, 25/32 (78.1%) samples of hard palate, 7/32 (21.9%) samples of buccal mucosa, 0/32 samples of lateral border of tongue, and 2/32 (6.3%) samples of abdominal skin. Double-labelling showed that all CK 20-positive Merkel cells also expressed CK 8/18 and S100. The only other cells to express CK 20 were human taste buds. There was no expression by dysplastic or invasive oral epithelium from biopsy samples. Colonic mucosa showed luminal-cell positivity in man, marmoset, ferret, rabbit and guinea-pig, but oral mucosa was universally negative in non-human species. It is concluded that in oral mucosa CK 20 is a specific marker of Merkel cells and taste buds, that Merkel cells are more frequently present in keratinized than non-keratinized oral mucosa, that CK 20-positive Merkel cells are also S100-positive, that there may be interspecies variations in CK 20 polypeptide composition and that, by contrast to urothelium, CK 20 has no value in the diagnosis of oral epithelial dysplasia.
Collapse
Affiliation(s)
- A W Barrett
- Department of Oral Pathology, Eastman Dental Institute for Oral Healthcare Sciences, University College London, 256 Grays Inn Road, WC1X 8LD, London, UK.
| | | | | | | |
Collapse
|