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Clinical Oral Investigations

Erschienen in:

02.02.2018 | Original Article

Expression and localization of CRAMP in rat tooth germ and during reparative dentin formation

verfasst von: Kanji Horibe, Akihiro Hosoya, Toru Hiraga, Hiroaki Nakamura

Erschienen in: Clinical Oral Investigations | Ausgabe 7/2018

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Abstract

Objectives

Cathelicidin-related antimicrobial peptide (CRAMP) is an antimicrobial peptide in mice and rats homologous to LL-37 in humans. In addition to its antibacterial activity, CRAMP has various physiological functions by binding to formyl peptide receptor 2 (FPR2). However, the role of these peptides in teeth is unknown. Therefore, we investigated the role of CRAMP and FPR2 in tooth development, reparative dentin formation, and defense response.

Material and methods

First, we examined the localization of CRAMP and FPR2 during tooth development by immunohistochemical analysis. Next, we investigated the localization of CRAMP, FPR2, and CD68-positive macrophages by immunohistochemical analysis during pulp inflammation and reparative dentin formation after cavity preparation. Finally, we analyzed the effect of lipopolysaccharide (LPS) on the expression of CRAMP and FPR2 in dental pulp cells by real-time reverse transcription PCR.

Results

At the late bell stage in tooth development, CRAMP was detected in odontoblasts, and FPR2 was observed in the sub-odontoblastic layer. In mature teeth, CRAMP was not detected, but FPR2 continued to be localized in the sub-odontoblastic layer. After cavity preparation, CRAMP-positive cells and macrophages were found in dental pulp tissues below the cavity at an early stage of repair. At subsequent stages of reparative dentin formation, CRAMP was observed in odontoblast-like cells that contacted reparative dentin. FPR2 immunoreactivity was also detected in odontoblast-like cells and neighboring cells. LPS stimulated the expression of CRAMP mRNA in dental pulp cells in vitro.

Conclusions

Localization of CRAMP and its receptor FPR2-positive cells were observed during physiological and reparative dentin formation.

Clinical relevance

CRAMP/LL-37 has a possibility that induce reparative dentin formation.

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Titel: Expression and localization of CRAMP in rat tooth germ and during reparative dentin formation
verfasst von: Kanji Horibe
Akihiro Hosoya
Toru Hiraga
Hiroaki Nakamura
Publikationsdatum: 02.02.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Clinical Oral Investigations / Ausgabe 7/2018
Print ISSN: 1432-6981
Elektronische ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-018-2353-x

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Expression and localization of CRAMP in rat tooth germ and during reparative dentin formation

Abstract

Objectives

Material and methods

Results

Conclusions

Clinical relevance

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Springer Medizin

Abstract

Objectives

Material and methods

Results

Conclusions

Clinical relevance

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