摘要:
Objective To investigate the pituitary tumor transforming gene (PTTG) expression pattern in pituitary cell senescence and pituitary adenoma tumorigenesis. Methods D-galactose induced F344 rats aging model. The rats aging expression and tumor generation condition were observed through pathological detection, molecular biology method was used to measure the expression of PTTG, P53, P21, P16 in pituitary tissue. Results ①D-galactose induced F344 rats showed significant characteristics of aging and oestrogen induced rats successfully generated prolactin adenoma; ②ag-ing Rats visible cytoplasmic vacuoles occurred, heterochromatin exists in the pituitary cell, pituitary PRL immunohisto-chemical was strong positive in tumor group rats; ③RT-PCR showed that PTTG mRNA expression in estrogen induced pituitary adenoma group was (12.99±1.86), PTTG expression of D-galactose induced aging group was (2.10±0.23), the difference was statistically significant (P<0.01); P53, P16, P21 mRNA expression of D-galactose induced aging group was (113.51±23.87), (29.26±4.44), (67.21±10.08), P53, P16, P21 mRNA expressed in estrogen induction of pituitary adenoma group was (83.26±8.06), (9.83±2.13), (28.19±2.01), the differences were statistically significant (P< 0.05); ④Western-blot strip integral grey value showed PTTG, P21 and P16 protein expression of D-galactose induced aging group was (0.198±0.032), (1.239±0.051), (1.673±0.055) and expressed in estrogen induced pituitary adenoma group was (1.002±0.041), (0.202±0.055), (0.409±0.059), the differences were statistically significant (P<0.05). Conclusion PTTG over-expression leads to senescence bypassed pituitary adenoma formation, PTTG weak expression leads to senescence. P16, P21 are important regulatory factors in pituitary cell senescence.%目的:探讨垂体瘤转化基因(PTTG)在垂体细胞衰老和垂体瘤中表达规律。方法构建F344大鼠D-半乳糖诱导衰老模型和雌激素诱导泌乳素腺瘤模型。观察大鼠的衰老表型及成瘤情况,对大鼠垂体进行病理学检测,分子生物学方法检测垂体PTTG、P53、P21、P16蛋白表达。结果①D-半乳糖成功诱导大鼠出现明显衰老特征,雌激素诱导大鼠成功生成泌乳素腺瘤;②衰老大鼠垂体胞质内有空泡和异染色质生成,肿瘤大鼠垂体PRL免疫组化为强阳性;③RT-PCR显示雌激素诱导组PTTG mRNA表达为(12.99±1.86),D-半乳糖诱导衰老组PTTG表达为(2.10±0.23),差异有高度统计学意义(P<0.01);D-半乳糖诱导衰老组P53、P16、P21 mRNA表达为(113.51±23.87)、(29.26±4.44)、(67.21±10.08),在雌激素诱导垂体瘤组中表达为(83.26±8.06)、(9.83±2.13)、(28.19±2.01),两组比较差异有统计学意义(P<0.05)。④Western-blot条带积分灰度值显示D-半乳糖诱导衰老组PTTG、P21、P16蛋白表达为(0.198±0.032)、(1.239±0.051)、(1.673±0.055),雌激素诱导垂体瘤中表达为(1.002±0.041)、(0.202±0.055)、(0.409±0.059),两组比较差异有统计学意义(P<0.05)。结论 PTTG基因过表达导致衰老绕过,垂体瘤形成。 PTTG表达减弱,诱导衰老。 P16、P21是垂体细胞衰老重要的调控因子。