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ヒト歯髄組織におけるc-Fosとマトリックスメタロペプチダーゼ9の発現に影響を与える
Extreme intrusive force affects the expression of c-Fos and matrix metallopeptidase 9 in human dental pulp tissues.
PMID: 32118792 DOI: 10.1097/MD.0000000000019394.
抄録
本研究の目的は、ワイヤーアプライアンスによる矯正治療を受けた患者の歯髄におけるc-Fosとマトリックスメタロペプチダーゼ9(MMP-9)の発現を調べることである。15名の患者(合計30歯)を、t"Zs_200A"="Zs_200A"0、t"Zs_200A"="Zs_200A"1、t"Zs_200A"="Zs_200A"4、t"Zs_200A"="Zs_200A"8、t"Zs_200A"="Zs_200A"12(n"Zs_200A"="Zs_200A"6)の5つのグループに無作為に割り付けた。t"Zs_200A"="Zs_200A"0群の患者の上顎第一小臼歯は、矯正治療を行わずに抜歯した。他の4群の上顎第一小臼歯には、ワイヤーを介して300"Zs_200A"gの押し込み力を加えた。この力は、t"Zs_200A"="Zs_200A"1群では1週間、t"Zs_200A"="Zs_200A"4群では4週間、t"Zs_200A"="Zs_200A"8群では8週間、t"Zs_200A"="Zs_200A"12群では12週間、抜歯前に維持された。歯髄におけるc-FosとMMP-9の蛋白質発現の関係をピアソン相関分析により解析したところ,300"Zs_200A"gの咬合力が歯髄におけるc-FosとMMP-9の発現を増加させた.歯髄におけるMMP-9の発現はc-Fosの発現と有意に相関していた(P"Zs_200A"<"Zs_200A".001)。また、c-FosとMMP-9の発現は、歯髄を侵襲した場合に有意に相関していることが明らかになった。
This study aimed to investigate the expression of c-Fos and matrix metallopeptidase 9 (MMP-9) in dental pulp of patients receiving orthodontic treatment via wire appliance.Fifteen patients (30 teeth in total) were randomly assigned to five groups: t = 0, t = 1, t = 4, t = 8 and t = 12 (n = 6). The first maxillary premolars of patients in the t = 0 group were extracted without any orthodontic treatment. An intrusive force of 300 g was applied on first maxillary premolars in the other four groups via wire appliances. This force was maintained for 1 week for t = 1 group, 4 weeks for t = 4 group, 8 weeks for t = 8 group, or 12 weeks for t = 12 group, before the teeth were extracted.The expression of c-Fos and MMP-9 in the pulps of each group was analyzed by immunohistochemical staining and real-time PCR. The relationship in the protein expression between c-Fos and MMP-9 in the dental pulp was analyzed by Pearson correlation analysis.Intrusive force of 300 g increased the expression of both c-Fos and MMP-9 in the dental pulp. The protein expression of MMP-9 in the dental pulp was significantly correlated with the expression of c-Fos (P < .001).Extreme intrusive force upregulates c-Fos and MMP-9 expression in the dental pulp. Moreover, protein expression of c-Fos and MMP-9 is significantly correlated under intrusive force.