环境因素对寡发酵链球菌与变形链球菌双菌种生物膜形成的影响  

Influence of environmental factors on the two-species biofilm formed by Streptococcus oligofermentans and Streptococcus mutans

作　　者：吴菲 李梦辞 孙翠翠 刘颖[3] 吴丽更[3] Wu Fei;Li Mengci;Sun Cuicui;Liu Ying;Wu Ligeng(Department of Endodontics,Yantai Stomatological Hospital Affiliated to Binzhou Medical College,Yantai 265500,China;Department of Endodontics,Tianjin Stomatological Hospital,Tianjin 300041,China;Department of Endodontics,Stomatological Hospital,Tianjin Medical University,Tianjin 300070,China)

机构地区：[1]滨州医学院附属烟台市口腔医院牙体牙髓科,265500 [2]天津市口腔医院牙体牙髓科,300041 [3]天津医科大学口腔医院牙体牙髓科,300070

出　　处：《中华口腔医学杂志》2019年第7期456-462,共7页Chinese Journal of Stomatology

摘　　要：目的比较不同环境条件对寡发酵链球菌(简称寡链)与变形链球菌(简称变链),血链球菌(简称血链)与变链双菌种生物膜形成的影响,评估寡链在维持口腔微生态平衡中的作用。方法分别在唾液包被的光滑玻璃表面和唾液包被的聚丙乙烯表面构建体外单菌种及双菌种生物膜模型,运用菌落计数法和番红精染色法测定不同氧环境(有氧和无氧)、不同蔗糖环境(无蔗糖、1%蔗糖环境和5%蔗糖环境)和不同pH环境(pH值为5.5、6.0、6.5、7.0、7.5及8.0)下寡链与变链、血链与变链双菌种生物膜的形成情况。结果双菌种共培养中变链菌落数:有氧环境下,寡链+变链组菌落数[(7.70±2.46)×10^8 CFU/ml]显著低于血链+变链组[(9.00±1.13)×10^8 CFU/ml](P<0.05)。无氧环境下,寡链+变链组菌落数[(2.80±0.52)×10^8 CFU/ml]亦显著低于血链+变链组[(4.00±1.25)×10^8 CFU/ml](P<0.05)。在无糖环境下,寡链+变链组菌落数[(8.90±0.82)×10^8 CFU/ml]显著高于血链+变链组[(7.50±1.73×10^8)CFU/ml](P<0.05);1%蔗糖环境下,寡链+变链组菌落数[(5.70±2.94)×10^8 CFU/ml]显著低于血链+变链组[(10.30±3.21)×10^8 CFU/ml](P<0.05);5%蔗糖环境下,寡链+变链组菌落数[(6.10±1.71)×10^8 CFU/ml]亦显著低于血链+变链组[(7.40±1.20)×10^8 CFU/ml](P<0.05)。pH7.0环境下,寡链+变链组菌落数[(3.50±1.50)×10^8 CFU/ml]显著低于血链+变链组[(10.70±2.80)×10^8 CFU/ml](P<0.05)。双菌种共培养24 h生物膜总量:两种氧环境下寡链+变链组均显著低于血链+变链组(P<0.05)。无糖环境下寡链+变链组显著高于血链+变链组(P<0.05),蔗糖环境(1%和5%)和pH 7.0环境下寡链+变链组均显著低于血链+变链组(P<0.05)。在pH 5.5和8.0环境下,寡链和血链均失去对变链的抑制能力。结论在体外双菌种共培养环境下,寡链具有较血链更强的抑制变链的能力,且其抑制能力受环境条件的影响。Objective To study the influence of environmental factors on the two-species biofilm formed by the combinations of Streptococcus oligofermentans(So)with Streptococcus mutans(Sm)and Streptococcus sanguinis(Ss)with Sm so as to evaluate the role of So in maintaining the microecological balance of the oral cavity.Methods Single-and two-species biofilms were grown on saliva-coated surfaces(glass tube and 96-well plate).Colony-counting method and safranin staining method were used to measure the biofilms formed under various oxygen conditions(aerobic and anaerobic),sucrose conditions(0%,1%and 5%sucrose concentrations)and pH conditions(5.5,6.0,6.5,7.0,7.5 and 8.0).Results Comparing the numbers of Sm in two co-cultures under various conditions,Sm counts in So+Sm group[(7.70±2.46)×10^8 CFU/ml]were significantly lower than those in Ss+Sm group[(9.00±1.13)×10^8 CFU/ml]in aerobic environment(P<0.05).Sm counts in So+Sm group[(2.80±0.52)×10^8 CFU/ml]were also significantly lower than those in the Ss+Sm group[(4.00±1.25)×10^8 CFU/ml]in anaerobic environment(P<0.05).The Sm counts in So+Sm group[(8.90±0.82)×10^8 CFU/ml]were significantly higher than those in Ss+Sm group[(7.50±1.73)×10^8 CFU/ml]in 0%sucrose environment(P<0.05).The Sm counts in So+Sm group[(5.70±2.94)×10^8 CFU/ml]were significantly lower than those in Ss+Sm group[(10.30±3.21)×10^8 CFU/ml]in 1%sucrose environment(P<0.05).The Sm counts in So+Sm group[(6.10±1.71)×10^8 CFU/ml]were also significantly lower than those in Ss+Sm group[(7.40±1.20)×10^8 CFU/ml]in 5%sucrose environment(P<0.05).The Sm counts in So+Sm group[(3.50±1.50)×10^8 CFU/ml]were significantly lower than those in Ss+Sm group[(10.70±2.80)×10^8 CFU/ml]in pH7.0 environment(P<0.05).Comparing the formation of biofilm after 24 h cultivation,the Sm counts in So+Sm group were significantly lower than those in Ss+Sm group both in aerobic and anaerobic environments(P<0.05).The Sm counts in So+Sm group were significantly higher than those in Ss+Sm group in 0%sucrose environment(P<0.05).The Sm

关 键 词：链球菌 变异 链球菌 血 寡发酵链球菌 氧 蔗糖 PH值 

分 类 号：R780.2[医药卫生—口腔医学]