1
|
Papp T, Polyak A, Papp K, Meszar Z, Zakany R, Meszar-Katona E, Tünde PT, Ham CH, Felszeghy S. Modification of tooth development by heat shock protein 60. Int J Oral Sci 2016; 8:24-31. [PMID: 27025262 PMCID: PMC4822183 DOI: 10.1038/ijos.2015.53] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2015] [Indexed: 12/13/2022] Open
Abstract
Although several heat shock proteins have been investigated in relation to tooth development, no available information is available about the spatial and temporal expression pattern of heat shock protein 60 (Hsp 60). To characterize Hsp 60 expression in the structures of the developing tooth germ, we used Western blotting, immunohistochemistry and in situ hybridization. Hsp 60 was present in high amounts in the inner and outer enamel epithelia, enamel knot (EK) and stratum intermedium (SI). Hsp 60 also appeared in odontoblasts beginning in the bell stage. To obtain data on the possible effect of Hsp 60 on isolated lower incisors from mice, we performed in vitro culturing. To investigate the effect of exogenous Hsp 60 on the cell cycle during culturing, we used the 5-bromo-2-deoxyuridine (BrdU) incorporation test on dental cells. Exogenously administered Hsp 60 caused bluntness at the apical part of the 16.5-day-old tooth germs, but it did not influence the proliferation rate of dental cells. We identified the expression of Hsp 60 in the developing tooth germ, which was present in high concentrations in the inner and outer enamel epithelia, EK, SI and odontoblasts. High concentration of exogenous Hsp 60 can cause abnormal morphology of the tooth germ, but it did not influence the proliferation rate of the dental cells. Our results suggest that increased levels of Hsp 60 may cause abnormalities in the morphological development of the tooth germ and support the data on the significance of Hsp during the developmental processes.
Collapse
Affiliation(s)
- Tamas Papp
- Department of Anatomy, Histology, and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Angela Polyak
- Department of Anatomy, Histology, and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Krisztina Papp
- Department of Anatomy, Histology, and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Zoltan Meszar
- Department of Anatomy, Histology, and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Roza Zakany
- Department of Anatomy, Histology, and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Eva Meszar-Katona
- Department of Anatomy, Histology, and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Palne Terdik Tünde
- Department of Anatomy, Histology, and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Chang Hwa Ham
- Department of Anatomy, Histology, and Embryology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.,Scoliosis Research Institute, Korea University Guro Hospital, Seoul, Korea
| | - Szabolcs Felszeghy
- Department of Oral Anatomy, Faculty of Dentistry, University of Debrecen, Debrecen, Hungary
| |
Collapse
|
2
|
Abstract
OBJECTIVE The aim of this work is to investigate the possible role of Toll-like receptor 4 (TLR4) during the development of mouse tooth germ. TLR4 is well known to inhibit mineralization and cause inflammation in mature odontoblasts and dental pulp cells. However, unlike these pathological functions of TLR4, little is known about the developmental function(s) of TLR4 during tooth development. MATERIALS AND METHODS TLR4 expression was studied via Western blot in developing lower mouse incisors from E13.5 to E18.5. To generate functional data about the effects of TLR4, a specific agonist (LPS) was applied to the medium of in vitro tooth germ cultures, followed by Western blot, histochemical staining, ELISA assay, in situ hybridization and RT-qPCR. RESULTS Increased accumulation of biotin-labelled LPS was detected in the enamel organ and in preodontoblasts. LPS treatment induced degradation of the inhibitor molecule (IκB) of the NF-κB signalling pathway. However, no morphological alterations were detected in cultured tissue after LPS addition at the applied dosage. Activation of TLR4 inhibited the mineralization of enamel and dentin, as demonstrated by alizarin red staining and as decreased levels of collagen type X. mRNA expression of ameloblastin was elevated after LPS administration. CONCLUSION These results demonstrate that TLR4 may decrease the mineralization of hard tissues of the tooth germ and may trigger the maturation of ameloblasts; it can give valuable information to understand better congenital tooth abnormalities.
Collapse
Affiliation(s)
- Tamas Papp
- a Department of Anatomy, Histology and Embryology; Faculty of Medicine , University of Debrecen , Debrecen , Hungary
| | - Krisztina Hollo
- a Department of Anatomy, Histology and Embryology; Faculty of Medicine , University of Debrecen , Debrecen , Hungary
| | - Eva Meszar-Katona
- a Department of Anatomy, Histology and Embryology; Faculty of Medicine , University of Debrecen , Debrecen , Hungary
| | - Zoltan Nagy
- a Department of Anatomy, Histology and Embryology; Faculty of Medicine , University of Debrecen , Debrecen , Hungary
| | - Angela Polyak
- a Department of Anatomy, Histology and Embryology; Faculty of Medicine , University of Debrecen , Debrecen , Hungary
| | - Edit Miko
- b Department of Medical Chemistry , University of Debrecen , Debrecen , Hungary
- c MTA-DE Lendület Laboratory of Cellular Metabolism Research Group , Debrecen , Hungary
- d Research Center for Molecular Medicine, University of Debrecen , Debrecen , Hungary
| | - Peter Bai
- b Department of Medical Chemistry , University of Debrecen , Debrecen , Hungary
- c MTA-DE Lendület Laboratory of Cellular Metabolism Research Group , Debrecen , Hungary
- d Research Center for Molecular Medicine, University of Debrecen , Debrecen , Hungary
| | - Szabolcs Felszeghy
- a Department of Anatomy, Histology and Embryology; Faculty of Medicine , University of Debrecen , Debrecen , Hungary
- e Department of Oral Anatomy, Faculty of Dentistry , University of Debrecen , Debrecen , Hungary
| |
Collapse
|