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年轻恒牙在发育过程中,常由于各种有害刺激、解剖变异等导致牙髓暴露,牙根发育受限[1]。相对于牙髓治疗,以替代或修复病损区细胞为主的干细胞疗法成为一种理想的治疗方案[2]。根尖牙乳头干细胞(stem cells from the apical papilla, SCAP)是生长在恒牙牙乳头内的新型干细胞群体,该细胞具有集落形成、自我更新、多分化及抗感染的优越性,是牙根牙本质再生的种子细胞[3]。当牙髓炎及根尖炎发生时,炎性环境及炎性因子的存在致使牙根发育停止,SCAP介导的牙本质再生功能受限,表明炎性因子可以影响SCAP的特性[4]。
白细胞介素-34(interleukin-34,IL-34)是一种具有复杂生物学特性的炎性因子,它可以刺激破骨细胞的产生,导致炎症区域的骨吸收[5]。研究[6]发现IL-34在牙周炎和种植体周围炎中高表达,参与牙周组织破坏过程;另有研究[7]发现IL-34在慢性根尖周病损组织中高表达,参与根尖炎症反应过程,但炎性环境中的IL-34是否作用于SCAP,尚鲜见研究报道。本研究通过不同浓度的IL-34作用于SCAP, 探究IL-34对SCAP增殖能力的影响,从而进一步了解炎性坏境中SCAP特性的改变,为临床治疗年轻恒牙牙髓炎、根尖炎提供理论依据。
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分离出的大鼠根尖牙乳头呈条索状,原发性SCAP在培养5~7d后呈现典型的细胞集落,显微镜下大部分SCAP呈梭形(见图 1)。
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流式细胞仪结果显示,第3代SCAP表达CD24为90.7%,呈阳性表达(见图 2)。成骨诱导液诱导2周后,茜素红染色,镜下见钙盐沉积(见图 3)。
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通过MTT实验测得各组不同时间细胞吸光度值,结果显示,第1天600ng/mL组低于对照组;第3天50ng/mL组和100ng/mL组高于对照组,400ng/mL组和600ng/mL组低于对照组;第5天和第7天25ng/mL组、50ng/mL组和100ng/mL组高于对照组,400ng/mL组和600ng/mL组低于对照组;第9天25ng/mL组、50ng/mL组和100ng/mL组高于对照组,200ng/mL组、400ng/mL组和600ng/mL组低于对照组,差异均有统计学意义(P < 0.05)。说明25ng/mL、50ng/mL、100ng/mL3组浓度的IL-34对SCAP增殖能力具有促进作用,其中50ng/mL实验组对SCAP增殖作用最显著,达到峰值;200ng/mL、400ng/mL、600ng/mL 3组浓度的IL-34抑制SCAP的增殖能力,尤以600ng/m L实验组对SCAP的抑制作用最显著(见表 1)。
分组 n 第1天 第3天 第5天 第7天 第9天 对照组 3 0.453±0.020 0.599±0.015 0.871±0.018 1.210±0.053 1.717±0.063 25ng/mL 3 0.446±0.021 0.608±0.020 1.167±0.033* 1.572±0.040* 1.763±0.004* 50ng/mL 3 0.459±0.014 0.621±0.008* 1.240±0.022* 1.652±0.045* 1.875±0.001* 100ng/mL 3 0.465±0.025 0.618±0.003* 0.969±0.008* 1.334±0.037* 1.732±0.032* 200ng/mL 3 0.441±0.015 0.582±0.015 0.857±0.016 1.168±0.028 1.693±0.065* 400ng/mL 3 0.424±0.017 0.572±0.015* 0.813±0.011* 1.133±0.028* 1.578±0.018* 600ng/mL 3 0.385±0.009* 0.489±0.012* 0.714±0.010* 0.907±0.020* 1.394±0.009* F — 6.78 34.42 311.48 145.28 51.300 P — < 0.01 < 0.01 < 0.01 < 0.01 0.006 MS组内 — 0.000 0.000 0.000 0.000 0.000 q检验:与对照组比较*P < 0.05 表 1 不同浓度IL-34各组吸光度值比较(x±s)
白细胞介素34对大鼠根尖牙乳头干细胞增殖的影响
Effect of interleukin-34 on the proliferation of rat stem cells from the apical papilla
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摘要:
目的探究炎性因子白细胞介素34(interleukin-34,IL-34)对大鼠根尖牙乳头干细胞(stem cells from rat apical papilla,SCAP)增殖的影响。 方法采用酶消化法分离培养大鼠根尖牙乳头干细胞,流式细胞仪鉴定SCAP表面标记分子,茜素红染色鉴定SCAP成骨分化潜能。将细胞分为实验组(含有不同浓度IL-34的细胞培养液)和对照组(不含IL-34的细胞培养液),四甲基偶氮唑蓝(MTT)实验检测IL-34对SCAP增殖能力的影响。 结果MTT实验结果显示,25 ng/mL、50 ng/mL、100 ng/mL IL-34实验组促进SCAP增殖,尤以50 ng/mL IL-34实验组对SCAP增殖的促进作用最显著,而200 ng/mL、400 ng/mL、600 ng/mL IL-34实验组则抑制SCAP增殖。 结论IL-34对SCAP的增殖有一定的调节作用,低浓度的IL-34促进SCAP增殖,高浓度的IL-34抑制SCAP增殖。 Abstract:ObjectiveTo investigate the effects of interleukin-34(IL-34)on the proliferation of rat stem cells from the apical papilla(SCAP). MethodsThe rat SCAP were isolated and cultured using enzyme digestion method.The surface marking molecules of SCAP were identified using flow cytometry, and the Alizarin red staining was used to identify the osteogenic potential of SCAP.The cells were divided into the experimental group(cell culture medium with different concentrations of IL-34)and control group(cell culture medium without IL-34).The effects of IL-34 on the proliferation of SCAP were detected using MTT assay. ResultsThe results of MTT assay showed that the proliferation of SCAP was promoted at the concentration of 25 ng/mL, 50 ng/mL and 100 ng/mL of IL-34, especially the 50 ng/mL of IL-34.The proliferation of SCAP was inhibited at the concentration of 200 ng/mL, 400 ng/mL and 600 ng/mL of IL-34. ConclusionsIL-34 can regulate the proliferation of SCAP.The low concentration of IL-34 can promote the proliferation of SCAP, while the high concentration of IL-34 can inhibit the proliferation of SCAP. -
Key words:
- stem cells from the apical papilla /
- interleukin-34 /
- proliferation /
- rat
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表 1 不同浓度IL-34各组吸光度值比较(x±s)
分组 n 第1天 第3天 第5天 第7天 第9天 对照组 3 0.453±0.020 0.599±0.015 0.871±0.018 1.210±0.053 1.717±0.063 25ng/mL 3 0.446±0.021 0.608±0.020 1.167±0.033* 1.572±0.040* 1.763±0.004* 50ng/mL 3 0.459±0.014 0.621±0.008* 1.240±0.022* 1.652±0.045* 1.875±0.001* 100ng/mL 3 0.465±0.025 0.618±0.003* 0.969±0.008* 1.334±0.037* 1.732±0.032* 200ng/mL 3 0.441±0.015 0.582±0.015 0.857±0.016 1.168±0.028 1.693±0.065* 400ng/mL 3 0.424±0.017 0.572±0.015* 0.813±0.011* 1.133±0.028* 1.578±0.018* 600ng/mL 3 0.385±0.009* 0.489±0.012* 0.714±0.010* 0.907±0.020* 1.394±0.009* F — 6.78 34.42 311.48 145.28 51.300 P — < 0.01 < 0.01 < 0.01 < 0.01 0.006 MS组内 — 0.000 0.000 0.000 0.000 0.000 q检验:与对照组比较*P < 0.05 -
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