Localization of Metallothionein (MT) and Expression of MT Isoforms Induced by Cadmium in Rat Dental Pulp

The Japanese Journal of Pharmacology

Hiroaki Furuta¹  Nariaki Oda¹  Tetsuyoshi Inoue²  Toshio Yamamoto³  Norio Sogawa¹  Chiharu Aoki Sogawa¹  Kenji Onodera¹ 

[1] Department of Dental Pharmacology, Okayama University Dental School;Department of Oral Microbiology, Okayama University Dental School;Department of Oral Anatomy I, Okayama University Dental School

关键词: Metallothionein;    Cadmium;    Dental pulp;    Odontoblast;    Pulp cell;   

DOI  :  10.1254/jjp.86.65

学科分类：药理学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(39)Cited-By(3)We investigated the induction of metallothionein (MT) by cadmium (Cd) in the dental pulp of rat incisors. Time-course studies of MT mRNA expression after single Cd injection were observed by Northern-blot analysis. The isoform-specific expressions of MT mRNAs (MT-I, MT-II and MT-III) were observed using the reverse transcriptase-polymerase chain reaction (RT-PCR) method. Both MT-I and MT-II mRNA levels increased within 3 h, peaked at 3 h and then decreased. These findings demonstrated that MT-I and MT-II mRNA were rapidly induced by Cd in dental pulp. MT-III mRNA was constitutively expressed in rat dental pulp, but the expression level did not change by Cd treatment. The localization of MT protein in Cd-treated rat dental pulp was determined by immunohistochemical staining using anti-MT antibody against MT-I and MT-II. MT protein was localized in the specific cell type of odontoblasts (secretory odontoblasts and resting odontoblasts). In conclusion, it is likely that stained MT in the immunohistochemical study should be MT-I and/or MT-II. Furthermore, MT-I and/or MT-II in Cd-treated rat dental pulp was localized in odontoblasts, in which accumulation of Cd were reported. The cell-specific synthesis of MT may be associated with its metal storage and detoxification role in dental tissues.

【 授权许可】

Unknown