纈沙坦對(duì)尿毒癥大鼠繼發(fā)性甲旁亢及腎臟纖維化的影響
發(fā)布時(shí)間:2018-07-29 13:47
【摘要】:背景 生理狀態(tài)下甲狀旁腺組織屬于極低分化組織,對(duì)其生命周期研究較為清楚的屬人和大鼠的甲狀旁腺組織,人體甲狀旁腺細(xì)胞生存周期約為20年,大鼠甲狀旁腺細(xì)胞生存周期約為2年。CRF患者由于體內(nèi)普遍存在低Ca、高P或活性維生素D缺乏等病變,這些因素持續(xù)刺激甲狀旁腺組織,使得正常低分化狀態(tài)的甲狀旁腺組織轉(zhuǎn)變?yōu)樵鲋吃錾鸂顟B(tài),且其增生的方式表現(xiàn)為自主性增殖,最終導(dǎo)致甲狀旁腺單克隆結(jié)節(jié)、腺瘤、腺癌發(fā)生的結(jié)局。SHPT患者PG結(jié)節(jié)中COX-2表達(dá)增加,并證實(shí)塞來(lái)昔布能夠抑制慢性腎衰竭繼發(fā)性甲狀旁腺功能亢進(jìn)大鼠PG的增生。且AngⅡ與COX-2的表達(dá)增加也相關(guān)。本研究通過(guò)5/6腎大部切除術(shù)結(jié)合高磷飲食喂養(yǎng)3個(gè)月建立SHPT大鼠模型,并全身性給予纈沙坦和塞來(lái)昔布干預(yù),觀察COX-2在大鼠腎臟和甲狀旁腺組織的表達(dá)差異,并對(duì)比其對(duì)腎功及PG異常增生有無(wú)影響。 方法 5/6腎切除結(jié)合高磷飲食(P1.2%,Ca1.6%)建立SHPT大鼠模型,4周后存活大鼠隨機(jī)分為假手術(shù)組(Sham-NP組,n=10)、正常磷飲食組(Nx-NP組,n=10)、高磷飲食組(Nx-HP組,n=10)、纈沙坦組(Val組,n=10)、塞來(lái)昔布組(Cel組,n=10)。術(shù)后正常磷飲食喂養(yǎng)4周,再依據(jù)分組分別給予正常磷和高磷飲食繼續(xù)喂養(yǎng)12周。于術(shù)后第4、16周檢測(cè)腎功和Ca、P、1,25(OH)2D3、 iPTH。術(shù)后第16周實(shí)驗(yàn)結(jié)束時(shí)處死所有實(shí)驗(yàn)大鼠,取腎臟、甲狀旁腺組織,HE、Masson染色分別觀察甲狀旁腺的大小、腎臟組織的病理形態(tài)和膠原纖維沉積情況,并行病理積分。應(yīng)用免疫組化技術(shù)分別觀察腎臟組織及甲狀旁腺組織中COX-2的表達(dá)情況,并分別對(duì)比分析五組大鼠腎臟組織和甲狀旁腺組織中COX-2表達(dá)強(qiáng)度的差異。 結(jié)果 1)各Nx組大鼠iPTH均較Sham組明顯升高(P均0.01),其中以Nx-HP組升高最明顯。纈沙坦和塞來(lái)昔布干預(yù)后較Nx-HP組降低(P均0.01)。 2)腎臟病理評(píng)分,各Nx組大鼠GSI和TIS均較Sham組顯著升高(P均0.01), Nx-HP組升高最顯著,Val組較Nx-HP組病理積分減低,纈沙坦可改善尿毒癥大鼠腎纖維化(P0.01)。 3)甲狀旁腺最大面積,Nx-HP組甲狀旁腺最大面積/體重比值最大,纈沙坦和塞來(lái)昔布干預(yù)后最大面積/體重比值較Nx-HP組減小(P均0.01)。 4)免疫組化結(jié)果顯示,COX-2在假手術(shù)組腎臟致密斑陽(yáng)性表達(dá)、在甲狀旁腺組織中幾乎沒(méi)有表達(dá),在Nx組大鼠中陽(yáng)性表達(dá)增加。 結(jié)論 5/6腎大部切除結(jié)合高磷飲食喂養(yǎng)可以成功建立SHPT大鼠模型。纈沙坦可改善尿毒癥大鼠腎功能和甲狀旁腺功能亢進(jìn),減輕腎臟纖維化和甲狀旁腺增生。
[Abstract]:Background the parathyroid tissue is a very poorly differentiated tissue under physiological conditions. The human parathyroid cells have a life cycle of about 20 years, which is clear about the life cycle of human and rat parathyroid tissues. The survival cycle of rat parathyroid cells is about 2 years. CRF patients have been continuously stimulated parathyroid tissue due to the presence of low calcium, high P or active vitamin D deficiency in the body. The normal poorly differentiated parathyroid tissue is transformed into proliferative and proliferative state, and the proliferation of parathyroid gland results in the proliferation of parathyroid gland, adenoma, and monoclonal nodule of parathyroid gland. The expression of COX-2 in PG nodules was increased in the patients with adenocarcinoma. It was confirmed that celecoxib could inhibit the proliferation of PG in rats with secondary hyperparathyroidism in chronic renal failure (CRF). The expression of Ang 鈪,
本文編號(hào):2152868
[Abstract]:Background the parathyroid tissue is a very poorly differentiated tissue under physiological conditions. The human parathyroid cells have a life cycle of about 20 years, which is clear about the life cycle of human and rat parathyroid tissues. The survival cycle of rat parathyroid cells is about 2 years. CRF patients have been continuously stimulated parathyroid tissue due to the presence of low calcium, high P or active vitamin D deficiency in the body. The normal poorly differentiated parathyroid tissue is transformed into proliferative and proliferative state, and the proliferation of parathyroid gland results in the proliferation of parathyroid gland, adenoma, and monoclonal nodule of parathyroid gland. The expression of COX-2 in PG nodules was increased in the patients with adenocarcinoma. It was confirmed that celecoxib could inhibit the proliferation of PG in rats with secondary hyperparathyroidism in chronic renal failure (CRF). The expression of Ang 鈪,
本文編號(hào):2152868
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