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Expression of typical calpains in mouse molar.

Abstract：

OBJECTIVE:Calpain is a calcium ion-dependent cysteine protease, consisting of two primary isoforms (calpain1/calpain2) which mediate crucial cellular functions. The activity of the calpains is tightly regulated by the endogenous inhibitor calpastatin. Calpains have been detected in several studies during the embryonic and foetal stages. The aim of this study is to investigate the temporal transition of typical calpains and their inhibitor calpastatin during odontogenesis. DESIGN:We used the first molar of foetal ICR mice from embryonic day (E) 14 to postnatal day (PN) 7. Using laser microdissection and semi-quantitative real-time PCR, we investigated calpain1, calpain2 and calpastatin expressions in each enamel epithelium, inner enamel epithelium, stellate reticulum and outer enamel epithelium. RESULTS:We found calpain1 and calpain2 mRNA increased in the all enamel epithelia between E18 and PN1. In addition calpastatin mRNA expression increased in the ameloblasts from PN1 to PN7. The immunohistochemistry results demonstrated that calpain1/calpain2 was present in the distal side of ameloblasts from PN1 to PN7, and calpastatin was present in the extracellular enamel matrix from E16 to PN1. Furthermore calpain1/calpain2 was present in the dentin, and calpastatin was detected in dentin producing odontoblasts and predentin at PN7. CONCLUSIONS:In this study the temporal transition of calpain1, calpain2 and calpastatin mRNA and the immunolocalization are identified during tooth development. Our results indicate that the calcium-dependent proteases may play an important role in mouse molar development and extracellular calpain and calpastatin may be involved in molar mineralization.

journal_name

Arch Oral Biol

journal_title

Archives of oral biology

authors

Matsunaga T,Yamamoto G,Tachikawa T

doi

10.1016/j.archoralbio.2009.07.002

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

885-92

issue

10

eissn

0003-9969

issn

1879-1506

pii

S0003-9969(09)00188-5

journal_volume

54

pub_type

杂志文章

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