机构地区:[1]苏州大学附属儿童医院内分泌科,215003 [2]苏州大学儿科医学研究所,215003
出 处:《中华实用儿科临床杂志》2016年第2期120-123,共4页Chinese Journal of Applied Clinical Pediatrics
基 金:苏州市科技局科技发展计划(应用基础研究)(SYS201242)
摘 要:目的研究新生期使用不同剂量双酚A(BPA)对雄性SD大鼠幼年期及青春期下丘脑-垂体-睾丸轴的影响。方法将80只新生雄性SD大鼠按随机数字表法分为5组:空白对照组、溶剂组、低剂量BPA组[25μg/(kg·d)]、中剂量BPA组[50μg(kg·d)]和高剂量BPA组[250μg/(kg·d)]。在出生第1—7天(PND1—7)每日皮下注射给药。PND22、PND50每组处死50%仔鼠,取下丘脑、睾丸称重。采用实时荧光定量-PCR测定下丘脑Kiss—I mIINA和睾丸雄激素受体(AR)mRNA的表达量,放射免疫法检测血清黄体生成素(LH)、卵泡刺激素(FSH)、睾酮(T)水平,酶联免疫吸附法检测抑制素B(INHB)水平。结果中、高剂量组与空白对照组比较,PND22血清FSH[(1.6100±0.6932)IU/L、(1.5743±0.6750)IU/L比(2.3629±0.5803)IU/L](F=3.314,P=0.026)、LH[(3.8763±0.9080)IU/L、(3.6038±1.3502)IU/L比(5.3025±0.7684)IU/L](F=3.139,P=0.027)、T[(0.3838±0.1778)μg/L、(0.4425±0.2141)μg/L]比(0.7825±0.2821)μg/L](F=5.106,P〈0.01)水平下降,PND50睾丸脏器系数[(0.95290±0.04915)%、(0.96920±0.04582)%比(1.02280±0.01108)%](F=10.326,P〈0.01)及血清T[(1.7586±0.3696)μg/L、(1.7188±0.3957)μg/L比(3.3575±0.7498)μg/L](F=13.799,P=0.012)明显降低;PND22高剂量BPA组下丘脑Kiss-I mRNA(0.06880±0.01179)表达较其余各组升高(F=272.125,P〈0.01),而PND50中、高剂量BPA组与空白对照组相比Kiss—I mRNA(0.00200±0.00025、0.00190±0.00048比0.00140±0.00017)表达下降(F=191.826,P〈0.01)。结论新生期中、高剂量BPA暴露可对幼年期及青春期大鼠睾丸功能产生损伤,并影响大鼠下丘脑-垂体-睾丸轴;低剂量BPA暴露未对幼年期及青春期雄性大鼠HPG轴产生明显影响。Objective To explore the effect of neonatal exposure to different doses of Bisphenol A (BPA) on the hypothalamic - pituitary - testis axis in toddler and adolescent male rats. Methods Neonatal male Sprague - Daw- ley rats were randomly divided into 5 groups through random digital table method:control group, vehicle group, low - doseBPA [25 μg/(kg · d)l group, medium-dose BPA[50 μg/(kg · d)] group and high-dose BPA [250 μg/( kg · d) ] group. The rats were subcutaneously injected with respective agents on postnatal days 1 -7 (PND 1 - 7 ). Pups were sacrificed on PND 22 and PND 50. The hypothalamus and testis were taken and weighed. The hypotha- lamie Kiss - 1 mRNA and the testis androgen receptor (AR) mRNA were tested by using real - time fluorescence quantitative and the levels of serum luteinizing hormone (LH) ,follicle stimulating hormone (FSH), testosterone (T) were tested by using radio immunity method, and inhibin B was measured by using enzyme linked immunosorbent assay. Results Compared with the controls , the level of serum FSH [(1.6100±0.6932) IU/L, (1. 574 3 ±0. 675 0) IU/L vs (2.362 9±0.580 3) IU/L] (F=3.314,P =0.026) ,LH [ (3. 876 3 ±0. 908 0) IU/L, (3. 603 8 ± 1.350 2) IU/L vs (5.3025±0.7684) IU/L](F=3.139,P=0.027) andT [(0.383 8±0. 177 8) μg/L,(0.442 5±0.214 1) μg/L vs ( 0. 782 5 ± 0. 282 1 ) μg/L ] ( F = 5.106, P 〈 0.01 ) of medium and high - dose BPA groups, were decreased in PND 22 ,and the organ coefficient of testis [ (0. 952 90 ±0. 049 15) %, (0. 969 20 ±0. 045 82) % vs ( 1. 022 80 ± 0.011 08)%](F=10.326,P〈0.01)and serumT [(1.758 6±0.369 6) μg/L, (1. 718 8±0.395 7) μg/Lvs (3. 357 5 ± 0.749 8 ) μg/L] ( F = 13. 799, P = 0. 012) were significantly decreased in PND 50. In high - dose BPA group of PND 22, the expression of hypothalamie Kiss - 1 mRNA (0. 068 80 ± 0.011 79 ) was increased compared with the other groups ( F = 272. 125, P 〈 0.01 �
关 键 词:双酚A 下丘脑-垂体-睾丸轴功能 新生雄性大鼠
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...