Influence of discontinuance of methimazole and propylthiouracil on 24 h radioactive iodine uptake in normal rats
10.3760/cma.j.issn.2095-2848.2017.03.008
- VernacularTitle:甲巯咪唑和丙硫氧嘧啶停药时间对正常大鼠甲状腺24h摄131I率的影响
- Author:
Rong NIU
;
Jianfeng WANG
;
Jianhua JIN
;
Yuetao WANG
- Keywords:
Thyroid gland;
Iodine uptake;
Iodine radioisotopes;
Methimazole;
Propylthiouracil;
Rats
- From:
Chinese Journal of Nuclear Medicine and Molecular Imaging
2017;37(3):162-165
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the influence of discontinuance of methimazole (MMI) and propylthiouracil (PTU) on 24 h radioactive iodine uptake(RAIU) in normal rats.Methods A total of 66 female SD rats were randomly divided into 3 groups by simple random sampling method.MMI group (30 rats) received MMI with a dose of 0.6 mg·ml-1·d-1 orally for 2 weeks, PTU group (30 rats) received PTU with a dose of 6 mg·ml-1·d-1 orally for 2 weeks.At 1, 3, 5, 7 and 9 d after MMI or PTU was discontinued, 6 rats were sacrificed to measure 24 h RAIU respectively.The control group (6 rats) received normal saline with a dose of 1 ml/d orally for 2 weeks, and then they were sacrificed to measure 24 h RAIU too.Data were analyzed with two-sample t test or t′ test.Results Thyroid 24 h RAIU in normal rats was (14.6±4.3)%.The 24 h RAIU on 1, 3, 5, 7 and 9 d was (4.6±0.7)%, (24.2±7.2)%, (13.1±2.9)%, (14.1±2.6)%, (16.1±3.7)% respectively after MMI withdrawal.The 24 h RAIU was significantly lower than that in control group at day 1 (t′=5.55, P<0.01), higher at day 3 (t=-2.83, P<0.05), and returned to the normal level at day 5, 7, 9 (t=0.68, 0.24,-0.67, all P>0.05).The 24 h RAIU on 1, 3, 5, 7 and 9 d was (1.9±0.8)%, (3.3±1.2)%, (7.7±2.4)%, (29.0±4.0)%, (17.1±4.8)% respectively after PTU withdrawal.It was lower than that in control group (t=7.01, 6.10, 3.40, all P<0.05) at day 1, 3, 5, and higher at day 7 (t=-5.97, P<0.01).The 24 h RAIU of 9 d showed no difference when compared with that in control group (t=-0.95, P>0.05).Conclusions MMI and PTU can inhibit the iodine uptake of thyroid, the 24 h RAIU returns to normal level at day 5 after withdrawal of MMI and at day 9 after withdrawal of PTU in euthyroid rats.
