摘要
目的通过对妊娠期甲状腺功能减低(甲低)大鼠补充左旋甲状腺素(L-thyroxine,L-T4),探讨甲状腺素对子代鼠脑组织同源盒基因Nkx2.1 mRNA表达影响,探讨该基因的表达与甲状腺素水平之间的关系。方法Wistar雌性大鼠120只,按体重分层随机分为对照组、甲低非治疗组,甲低孕鼠妊娠早期(妊娠第1—17天)补充L—T4高、中、低剂量组,甲低孕鼠妊娠晚期(妊娠第18天至分娩后第20天)补充L.T4高、中、低剂量组,共8组,每组15只;补充L—T4高、中、低剂量分别为:3.5、2.0,0.5μg/100g体重。各组均给予低碘饮食,对照组饮用碘浓度为200μg/L碘酸钾溶液,其余7组饮用去离子水。3个月后各组均与正常雄性大鼠交配,确定受孕后各甲低给药组于不同时期给予补充L-T4。各组分别取孕第17天胎鼠、新生及出生后第20天龄仔鼠前脑组织,实时荧光定量PCR(Real-time PCR)检测Nkx2.1mRNA水平。结果甲低孕鼠妊娠早期补充L-T4高、中、低剂量组,甲低孕鼠妊娠晚期补充L—T4高、中、低剂量组,甲低非治疗组、对照组大鼠血清TT3,分别为(0.85±0.17)、(0.81±0.18)、(0.86±0.21)、(0.85±0.20)、(0.89±0.18)、(0.85±0.20)、(0.86±0.20)、(1.08±0.07)nmol/L(F:4.08,P〈0.01);TT4分别为(0.43±0.16)、(0.39±0.11)、(0.39±0.13)、(0.43±0.17)、(0.51±0.19)、(0.43±0.16)、(0.41±0.15)、(39.43±14.16)nmol/L(F=31.99,P〈0.01);FT3分别为(3.29±0.61)、(3.29±0.61)、(3.24±0.61)、(3.28±0.63)、(3.31±0.59)、(3.28±0.50)、(3.24±0.49)、(4.93±0.46)pmol/L(F:5.79,P〈0.01);FT4分另0为(3.38±0.80)、(3.31±0.67)、(3.29±0.73)、(3.27±0.71)、(3.48±0.81)、(3.56±0�
Objective To explore the effects of thyroid hormone on the expression of homeobox gene Nkx2.1 mRNA in child rat by supplying their hypothyroidism pregnant mother with different dose of levothyroxine( L-thyroxine , L-T4 ) in different times. Methods 120 female Wistar rats were randomly divided into eight groups according to the body weight: control group, non-treatment hypothyroidism group, hypothyroidism groups supplied with L-T4 in high, medium and low dosage in early stage (lst-17th day of pregnancy) and in late stage (18th day of pregnancy-20th day after childbirth). According to 100 grams of body weight,the concentrations of L-T4 were 3.5,2. 0,0. 5 μg/d in high,medium and low dosage group. All the rats were fed with low-iodine food. The control group was given 200 μg/L potassium iodate solution as drinking water and the other groups were given deionized water. After three months, the rats were mated with normal male rats. After the pregnancy was confirmed, hypothyroidism groups were supplied with L-T4 of different concentrations. Brain samples were taken from the 17-day fetal rats, new-born and 20-day old offsprings and the levels of Nkx2. 1 mRNA in brain tissue were analyzed by real-time fluorescence quantitative PCR techniques. Results The levels of Tr3 in hypothyroidism groups supplied with L-T4 in high, medium and low dosages in early and late pregnant stages, non-treatment hypothyroidism group and control group were (0.85±0.17),(0.81 ±0.18),(0.86 ±0.21),(0.85 ±0.20),(0.89 ±0.18), (0.85 ±0.20) , (0. 86 ±0.20) ,(1.08 ±0. 07) nmol/L (F=4.08,P〈0. 01) ; the levels ofTT4 in each group were (0.43±0.16),(0.39±0.11),(0.39 ±0.13),(0.43 ±0.17),(0.51±0.19),(0.43± 0. 16), (0. 41 ±0. 15) , (39.43 ± 14. 16) nmol/L ( F = 31.99 ,P 〈 0. 01 ) ; the levels of PT3 in each group were (3.29 ±0. 61) ,(3.29± 0. 61), (3.24±0. 61), (3.28 ±0. 63), (3.31 ± 0. 59), (3.28±0. 50), (3.24±0.49),�
出处
《中华预防医学杂志》
CAS
CSCD
北大核心
2010年第8期726-730,共5页
Chinese Journal of Preventive Medicine
基金
国家自然科学基金(30571617)