長(zhǎng)期低硒、低碘對(duì)仔代發(fā)育期大鼠甲狀腺形態(tài)結(jié)構(gòu)及PCNA、TTF-1表達(dá)的影響
[Abstract]:Background and purpose
The changes in thyroid morphology and function caused by iodine deficiency are fully confirmed in human and animal bodies. In this process, trace element selenium is also involved. The mechanism research is mainly focused on selenium defense superoxide damage and selenium affecting the metabolic process of thyroid hormone.
In the past, most of the animal studies in this field are based on primary adult animals, and epidemiological surveys show that generations of people who reproduce in low selenium and iodine areas often suffer more serious damage to their offspring's thyroid gland. At present, there is no effect on the role of the two factors of low selenium and low iodine in the thyroid gland of the offspring of the offspring. In this experiment, on the basis of the animal model that has been successfully established in the earlier period of the project, the thyroid gland of the three generation of the offspring of the offspring (4 days of age, 21 days of age, adult) was selected for a long period of long-term sustained low selenium and low iodine feeding, and the histomorphology observation, stereological measurement and detection of the proliferation of thyroid epithelial cells were carried out. The expression of nuclear antigen (PCNA) and thyroid transcription factor 1 (TTF-1), from follicular morphology, cell proliferation and cell functional status were studied to explore the effect of low selenium and iodine on the thyroid morphology and function of rats in different developmental stages of the offspring.
Method
The SD rat model of artificial low selenium and low iodine feed was successfully established in the group of three generation fetal mice (F3E), 4 days of age (F3P4), 21 days of age (F3P21) and four adult (F3A) developmental time points of the rat's thyroid tissue as the research object, and the rats were divided into four groups at each time point: (control), and second group (2). Se~-), low iodine group (I~-), low selenium low iodine group (Se~-I~-).
1.HE staining was used to observe the morphological changes of thyroid tissue in F3E, F3P4, F3P21 and F3A groups.
2. After HE staining, the average follicular number, average follicular cavity area and average follicular epithelial cell height were measured.
3. The expression of proliferating cell nuclear antigen (PCNA) in thyroid follicular epithelial cells of F3P4, F3P21 and F3A groups was detected by immunohistochemical staining.
4. The expression of thyroid transcription factor-1 (TTF-1) in thyroid follicular epithelial cells of F3P4, F3P21 and F3A groups was detected by immunohistochemical staining.
Result
1. tissue morphology observation: F3A, F3P21, F3P4 three developmental time points: the thyroid gland of group Se~- was similar to that of control group. In group F3ASe~-, the thyroid follicular fibrosis changed in group.I~- and the morphological changes of thyroid gland in group Se~-I~-, which were small follicular hyperplasia, small cavity or even cavity without cavity. The F3E thyroid gland is markedly immature, densely packed, and typically has fewer follicles.
2. the results of stereological measurement: (1) mean follicular number: F3A average follicular number Se~- group and control group no difference (P > 0.05), the number of follicles in group I~- and Se~-I~- group is more than that of control group and Se~- group (P < 0.01).F3P21 average follicular number Se~- group and control group no difference (P > 0.05), I~- group and Se~ group follicular number more than the control group and group (0.01) The average follicular number in group Se~- was no difference between group I~- and control group (P > 0.05). The number of follicles in group Se~-I~- was more than that of other groups (P < 0.05). The mean follicular area of group F3A Se~- group was not different from that of control group (P > 0.05), and the area of follicle cavity in I~- group and Se~-I~- group was significantly reduced (P < 0.01). There was no difference between group Se~-I~- and group Se~-I~- (P > 0.05) the area of follicular cavity in group.I~- and group Se~-I~- was significantly smaller than that between the control group and Se~- group (P < 0.01), there was no difference between the.F3P4 Se~- group and the Se~-I~- group (P < 0.05), and there was no difference between the other groups (P > 0.05). There was no difference between the 3A Se~- group and the control group (P > 0.05) the cell height increased in the.I~- group and the Se~-I~- group (P < 0.01). The highest.F3P21 in the follicle epithelial cells in the Se~-I~- group was significantly different from the control group (P < 0.01), and the Se~- group was the lowest. There was no difference (P > 0.05). The cell height of group.I~- and group Se~-I~- was significantly higher than that of control group (P < 0.01), and Se~-I~- group had the highest cell height.
The expression of 3.PCNA expression: the expression of thyroid follicle epithelial cells in F3A, F3P21, F3P4 rats increased gradually from the control group to the Se~-I~- group. The expression of the control group and the Se~- group was mostly negative or weak positive, the expression of the I~- group and the Se~-I~- group was obviously enhanced (mostly in + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +) in the control group and the Se~-I~- group (+ + + + + + +). 3A group was 0%, group Se~- 6.3%, group I~- 28.6%, Se~-I~- group 50%.F3P21 group 0%, Se~- group 0%, I~- group 16.7%, 21.4%.F3P4 group of Se~-I~- group were Control group 0%, 0% group, 42.9% group.
4.TTF-1 expression results: the expression of F3A control group was all negative or weak positive, Se~- group, group I~- and Se~-I~- group were obviously enhanced (mostly + + + + + +). Four groups of strong positive (+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +). + + + + + + + +), the strong positive expression percentage of four groups reached 61.5% in group Control, 55.6% in group Se~-, 90% in group I~-, and no difference in the expression of 85.3%.F3P4 four groups in group Se~-I~-. No strong positive expression was found.
conclusion
1. simple selenium can lead to the change of thyroid morphologic structure in the three generation of the offspring, which makes the number of follicular follicles increased, the size of the cells and the epithelial cells proliferate. But the effect is less than the low iodine. And the effect of low selenium and iodine is superimposed. The maturity of the ontogeny is gradually apparent.
2. low selenium and low iodine can enhance the expression of proliferating cell nuclear antigen (PCNA) in the thyroid follicular epithelial cells of the three generation rats. The effect of low selenium is weaker than low iodine, and the effect of low selenium and iodine is superimposed. The effect of low selenium and low iodine on the expression of selenium is not obvious at 4 days of age. At the age of 21 days, it is shown and kept to adulthood at the age of 21. The process of mature and gradual development.
3. low selenium and low iodine can enhance the expression of thyroid transcription factor 1 (TTF-1) in the thyroid follicular epithelial cells of the three generation rats. The effect of low selenium is weaker than that of low iodine, and the effect of low selenium and iodine is superimposed. The effect of low selenium on the expression of TTF-1 is not manifested at 4 days of age. At the age of 21 days, the expression of low selenium is the most obvious and most obvious in adulthood. It is a gradual process with the development and maturity of individuals.
【學(xué)位授予單位】:汕頭大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2007
【分類號(hào)】:R363
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