五氯酚的甲状腺干扰效应  被引量:1

Thyroid disruption induced by pentachlorophenol

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作  者:刘莉[1] 陈涵一[1] 姚国英[1] 张皓[1] 郑唯韡[1] 韦霄[1] 陈鑫[1] 蒋颂辉[1] 屈卫东[1] 

机构地区:[1]复旦大学公共卫生学院环境卫生学教研室公共卫生安全教育部重点实验室,上海200032

出  处:《中华预防医学杂志》2010年第4期334-339,共6页Chinese Journal of Preventive Medicine

基  金:国家“十一五”科技支撑计划(2006BA119802);2008年卫生标准制(修)订项目(2008-02-02);上海市公共卫生优秀学科带头人培养计划(08GWD14)

摘  要:目的采用经济合作与发展组织推荐的检测指南407(TG407)法评价五氯酚(PCP)的甲状腺干扰效应。方法无特定病原体(specificpathogenfree,SPF)级SD大鼠30只,按数字表法随机分为对照组、低剂量组(0.33mg·kg^-1·d^-1PCP—Na)和高剂量组(30mg·kg^-1·d^-1PCP-Na),每组雌雄各5只,每目经口灌胃,连续28d。染毒结束后,观察PCP-Na对大鼠甲状腺组织学的影响和血清甲状腺激素(THs)水平,包括总三碘甲状腺原氨酸(TT3)、总四碘甲状腺原氨酸(TT4)、游离T3(FT3)、游离T4(FT4);实时定量PCR法检测肝脏2种甲状腺受体(TRs)和3种脱碘酶(Dios)基因表达水平。结果30mg·kg^-1·d^-1剂量的PCP—Na可导致SD大鼠肝重和肝脏系数增加,雄鼠和雌鼠肝脏系数分别为(4.82±0.42)%和(4.99±0.17)%,较对照组[分别为(3.54±0.14)%、(3.52±0.19)%]增加了36.2%(t=7.338,P〈0.01)和41。8%(t=8.955,尸〈0.01),而肾和甲状腺未见明显影响;高剂量组雄鼠血清TT4和FT4浓度分别为(64.95±7.16)nmol/L和(8.16±2.29)pmol/L,与对照组[分别为(88.48±6.99)nmol/L、(14.13±1.68)pmol/L]相比降低了26.6%(t=-3.999,P〈0.01)和42.3%(t=-4.112,P〈0.01),雌鼠血清FT4浓度为(4.94±0.89)pmol/L,与对照组[(11.10±3.40)pmol/L]相比降低55.5%(t=-3.380,P=0.012),TT3和FT3浓度分别为(1.92±0.24)nmol/L和(3.05±0.79)pmol/L,与对照组[分别为(1.10±0.23)nmol/L、(1.96±0.32)pmol/L]相比分别增加74.5%(t=5.263,P〈0.01)和55.6%(t=3.495,P〈0.01);高剂量PCP—Na不影响大鼠肝TRa、TRB、DioⅢ基因表达水平,但DioI和Di0Ⅱ显示了不同性别的敏感性,雄鼠高剂量组DioⅡ表达(0.209±0.017)较对照组(1.006±0.137)下调79.2%(t=-5�Objective To assess thyroid disruption induced by sodium pentachlorophenol (PCP) using Organization for Economic Co-operation and Development (OECD) recommended TG 407 method. Methods A total of 30 specific pathogen free (SPF) SD adult male and female rats were randomly divided into 3 groups,and treated with water,0. 33 and 30 mg ·kg^-1·d^-1 of PCP-Na by oral gavage for consecutive 28 days, respectively. After final treatment, histological changes of thyroid were observed by hematoxylin-eosin stain, and the levels of thyroid hormones ( total thyroxine ( TT4 ) , free thyroxine ( FT4 ), total triiodothyronine ( TT3 ), and free triiodothyronine ( FT3 ) ) were determined by radioimmunoassay. The expression levels of thyroid receptors ( TRα and TRβ) mRNA and deiodinases ( Dio I , Dio II and Dio III) mRNA in liver were analyzed by RT-PCR. Results In high dose group,liver weight coefficient of male and female rats were (4. 82 ±0. 42)% and (4. 99 ±0. 17)% ,increased by 36.2% (t =7. 338,P 〈0. 01 ) and 41.8%(t= 8. 955,P〈 0.01),compared to control group((3.54 ± 0.14)%, (3.52 ± 0.19)%), respectively, while the significant changes of kidney or thyroid weight were not observed. In high dose group, the levels of TT4 and FT4 in serum of male rats were (64. 95 ±7.16) nmol/L and (8. 16 ±2. 29) pmol/L, and decreased by 26. 6% (t= -3.999,P〈0.01) and 42.3% (t= -4.112,P〈0.01) compared to control group( (88.48 ± 6. 99) nmol/L, ( 14. 13 ± 1.68) pmoL/L). In the same group, FT4 in serum of female rats was (4. 94 ± 0. 89 ) pmol/L, decreased by 55.5% ( t = - 3. 380, P = 0. 012) compared to control group ( ( 11.10 ± 3.40 ) pmol/L) and TT3 and FT3 in serum of female rats were ( 1.92 ±0. 24 ) nmol/L and (3. 05 ±0. 79) pmol/L, increased by 74. 5% ( t = 5. 263, P 〈 0. 01 ) and 55. 6% ( t = 3. 495, P 〈 0.01 ) compared to control group ( ( 1.10 ± 0. 23 ) nmol/L, ( 1.96 ± 0. 32 ) pmo

关 键 词:内分泌干扰物 甲状腺激素 五氯酚 碘化过氧化物酶 

分 类 号:R114[医药卫生—卫生毒理学]

 

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