[摘要] 目的 探討異葒草素(ISO)對(duì)2型糖尿?。═2DM)肺小動(dòng)脈的保護(hù)作用及其機(jī)制。
方法 將小鼠隨機(jī)分為正常對(duì)照組和實(shí)驗(yàn)組,實(shí)驗(yàn)組給予高脂飼料及鏈脲佐菌素干預(yù)建立T2DM小鼠模型,喂養(yǎng)2月后將造模成功的小鼠隨機(jī)分為模型對(duì)照組及低、中、高ISO治療組,各10只。低、中、高ISO治療組小鼠每天分別腹腔注射10、20、40 mg/kg的ISO,正常對(duì)照組和模型對(duì)照組腹腔注射等量5 g/L羧甲基纖維素鈉,期間觀察各組小鼠的一般情況、體質(zhì)量、血糖改變。注射8周后處死小鼠,取肺組織,分別應(yīng)用蘇木精-伊紅染色、Masson染色觀察肺組織及肺小動(dòng)脈改變,實(shí)時(shí)熒光定量PCR方法測(cè)定肺組織白細(xì)胞介素-1β(IL-1β)、白細(xì)胞介素-6(IL-6)、腫瘤壞死因子-α(TNF-α)、內(nèi)皮素-1(ET-1)、血管內(nèi)皮生長(zhǎng)因子(VEGF)及血管緊張素受體2(ACE2)mRNA表達(dá),ELISA法檢測(cè)晚期糖基化終末產(chǎn)物(AGEs)水平,Western Blot方法檢測(cè)c-Jun氨基末端激酶(JNK)、細(xì)胞外調(diào)節(jié)蛋白激酶1/2(ERK1/2)及其磷酸化蛋白水平。
結(jié)果 與模型對(duì)照組相比,低、中、高ISO治療組小鼠空腹血糖降低(F=30.009,Plt;0.001),體質(zhì)量增加(F=63.149,Plt;0.001);肺部炎性細(xì)胞浸潤(rùn)、肺小動(dòng)脈增厚、膠原纖維增多、小動(dòng)脈管腔變窄均明顯改善;肺組織中IL-1β、IL-6、TNF-α mRNA表達(dá)下降(H=26.791~30.254,Plt;0.001),AGEs含量減少(F=12.482,Plt;0.01);血管內(nèi)皮損傷指標(biāo)VEGF、ET-1 mRNA表達(dá)下降,ACE2 mRNA表達(dá)升高(F=6.994~37.569,Plt;0.05);JNK、ERK1/2磷酸化水平下降(F=3.890、6.518,Plt;0.01)。
結(jié)論 ISO可以通過降低血糖、抑制炎性反應(yīng)、減輕氧化應(yīng)激和血管內(nèi)皮細(xì)胞損傷、抑制JNK和ERK1/2信號(hào)轉(zhuǎn)導(dǎo)通路,對(duì)抗T2DM肺小動(dòng)脈病變。
[關(guān)鍵詞] 異葒草素;糖尿病,2型;肺動(dòng)脈
[中圖分類號(hào)] R284;R587.1
[文獻(xiàn)標(biāo)志碼] A
[文章編號(hào)] 2096-5532(2024)06-0791-05
doi:10.11712/jms.2096-5532.2024.60.196
[開放科學(xué)(資源服務(wù))標(biāo)識(shí)碼(OSID)]
[網(wǎng)絡(luò)出版] https://link.cnki.net/urlid/37.1517.R.20250107.1910.006;2025-01-08 13:57:10
Protective effect of isoorientin on pulmonary arterioles in type 2 diabetes mellitus and its mechanism
HAN Lin, CHE Kui, CHI Jingwei, WANG Yangang
(Department of Endocrinology and Metabolism, The Affiliated Hospital of Qingdao University, Qingdao 266003,China)
[Abstract] Objective To investigate the protective effect of isoorientin (ISO) on pulmonary arterioles in type 2 diabetes mellitus (T2DM) and its mechanism.
Methods "Mice were randomly divided into normal group and experimental group. The mice in the experimental group were given high-fat diet and streptozotocin to establish a mouse model of T2DM, and after 2 months of feeding, the mice were randomly divided into model control group and low-, middle-,and high-dose ISO treatment groups, with 10 mice in each group. The mice in the low-, middle-, and high-dose ISO treatment groups were given intraperitoneal injection of ISO at a dose of 10, 20, and 40 mg/kg, respectively, every day, while those in the normal group and the model control group were given intraperitoneal injection of an equal volume of 5 g/L sodium carboxymethyl cellulose, and the mice in all groups were observed in terms of the changes in general status, body weight and blood glucose. The mice were sacrificed after 8 weeks of injection, and lung tissue was collected; HE staining and Masson staining were used to observe the changes in lung tissue and pulmonary arterioles; quantitative real-time PCR was used to measure the mRNA expression levels of interleukin-1β (IL-1β), interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), endothelin-1 (ET-1), vascular endothelial growth factor (VEGF), and angiotensin receptor 2 (ACE2) in lung tissue; ELISA was used to measure the levels of advanced glycation end products (AGEs); Western Blot was used to measure the levels of c-Jun N-terminal kinase (JNK), extracellular signal-regulated kinase 1/2 (ERK1/2), and their phosphorylated proteins.
Results "Compared with the model control group, the low-, middle-, and high-dose ISO treatment groups had a significant reduction in fasting blood glucose (F=30.009,Plt;0.001), a significant increase in body weight (F=63.149,Plt;0.001), significant increases in pulmonary inflammatory infiltration, thickness of pulmonary arterioles, and collagen fibers, and a significant improvement in the narrowing of arterioles; there were also significant reductions in the mRNA expression levels of IL-1β, IL-6, and TNF-α in lung tissue (H=26.791-30.254,Plt;0.001) and a significant reduction in the content of AGEs (F=12.482,Plt;0.01); as for the indicators for vascular endothelial injury, there were significant reductions in the mRNA expression levelsof VEGF and ET-1 and a significant increase in the mRNA expres-sion level of ACE2 (F=6.994-37.569,Plt;0.05), as well as significant reductions in the phosphorylation levels of JNK and ERK1/2 (F=3.890,6.518;Plt;0.01).
Conclusion ISO can exert a protective effect against pulmonary arteriole lesions by reducing blood glucose, inhibiting inflammatory response, alleviating oxidative stress and vascular endothelial cell damage, and inhi-biting the JNK and ERK1/2 signal transduction pathways.
[Key words] isoorientin; diabetes mellitus, type 2; pulmonary artery
我國(guó)2型糖尿?。═2DM)患病率已經(jīng)上升至11.2%[1],目前對(duì)其研究集中于糖尿病腎病、視網(wǎng)膜病變、周圍神經(jīng)病變等,而對(duì)糖尿病靶器官肺的研究較少。2019年全球爆發(fā)了新型冠狀病毒肺炎,該病在糖尿病病人中發(fā)病率高、易轉(zhuǎn)為重癥、住院時(shí)間長(zhǎng),且死亡風(fēng)險(xiǎn)高[2]。僅僅將其原因考慮為糖尿病病人容易感染是片面的,探究糖尿病肺組織及血管改變的病理機(jī)制并進(jìn)行有效干預(yù)具有重要的意義。異葒草素(ISO)是一種黃酮類化合物,它具有改善糖尿病相關(guān)指標(biāo)、抑制炎性反應(yīng)、抵抗氧化應(yīng)激等作用[3-4]。本研究建立T2DM小鼠模型,給予ISO干預(yù),觀察其對(duì)T2DM小鼠肺組織及小動(dòng)脈病變的影響及作用機(jī)制。
1 材料和方法
1.1 實(shí)驗(yàn)材料
SPF級(jí)4~5周雄性C57BL/6Cnc小鼠50只,體質(zhì)量(25±3)g,購(gòu)自北京維通利華實(shí)驗(yàn)動(dòng)物技術(shù)有限公司。ISO(純度gt;98%),購(gòu)自北京普天同創(chuàng)生物科技有限公司;c-Jun氨基末端激酶(JNK)、磷酸化c-Jun氨基末端激酶(p-JNK)、細(xì)胞外調(diào)節(jié)蛋白激酶1/2(ERK1/2)、磷酸化細(xì)胞外調(diào)節(jié)蛋白激酶1/2(p-ERK1/2)、GAPDH抗體及兔二抗均購(gòu)自Cell Signaling Technology公司。
1.2 實(shí)驗(yàn)分組及處理
小鼠隨機(jī)分為正常對(duì)照組(10只)和實(shí)驗(yàn)組(40只),實(shí)驗(yàn)組小鼠使用高脂飼料喂養(yǎng)4周后,連續(xù)腹腔注射鏈脲佐菌素(STZ,30 mg/kg)5次,1周后測(cè)隨機(jī)血糖,隨機(jī)血糖>16.7 mmol/L為小鼠T2DM模型造模成功[5]。繼續(xù)喂養(yǎng)小鼠2月,將造模成功的糖尿病小鼠隨機(jī)分為模型對(duì)照組、ISO低劑量組(10 mg/kg)、ISO中劑量組(20 mg/kg)、ISO高劑量組(40 mg/kg),各10只。ISO各劑量組分別腹腔注射相應(yīng)劑量ISO,正常對(duì)照組和模型對(duì)照組每天腹腔注射等量5 g/L羧甲基纖維素鈉。給藥8周后,處死小鼠,取出小鼠雙肺備用。
1.3 觀察指標(biāo)
1.3.1 一般情況及體質(zhì)量 每周觀察各組小鼠精
神是否飽滿,行為活動(dòng)是否敏捷,飲水、進(jìn)食、尿量等。各組小鼠排空小便,空腹,應(yīng)用電子分析天平稱體質(zhì)量。
1.3.2 空腹血糖(FBG) 應(yīng)用羅氏血糖儀檢測(cè)小鼠FBG。
1.3.3 蘇木精-伊紅(HE)染色 取小鼠右上肺,固定,石蠟包埋,切片,HE染色,光鏡下觀察。
1.3.4 Masson染色 肺組織切片,依次行Weigert鐵蘇木素染色液染色、Masson藍(lán)化液返藍(lán)、麗春紅品紅染色液染色、磷鉬酸溶液弱酸處理、苯胺藍(lán)染色液染色,再經(jīng)乙醇脫水,二甲苯透明,自然晾干,封片,顯微鏡下觀察。
1.3.5 實(shí)時(shí)熒光定量PCR(qRT-PCR)方法檢測(cè)炎性因子及血管內(nèi)皮損傷指標(biāo)mRNA的相對(duì)表達(dá)水平 應(yīng)用TRIzol法提取肺組織總RNA,逆轉(zhuǎn)錄成cDNA。用熒光定量PCR儀檢測(cè)各組肺組織白細(xì)胞介素-1β(IL-1β)、白細(xì)胞介素-6(IL-6)、腫瘤壞死因子-α(TNF-α)、內(nèi)皮素-1(ET-1)、血管內(nèi)皮生長(zhǎng)因子(VEGF)及血管緊張素受體2(ACE2)mRNA水平,以管家基因(β-actin)為內(nèi)參進(jìn)行標(biāo)準(zhǔn)化,采用2-△△CT法計(jì)算目的基因的相對(duì)表達(dá)量。引物由華大基因公司合成。qRT-PCR反應(yīng)條件:95 ℃預(yù)變性30 s;95 ℃變性5 s,60 ℃退火30 s,進(jìn)行50個(gè)循環(huán)。引物及其序列見表1。
1.3.6 ELISA方法檢測(cè)肺組織晚期糖基化終末產(chǎn)物(AGEs) 取新鮮肺組織,超聲破碎,離心取上清液,用BCA法測(cè)定蛋白濃度。應(yīng)用ELISA試劑盒檢測(cè)AGEs濃度,根據(jù)說明書方法進(jìn)行操作。
1.3.7 Western Blot檢測(cè)相關(guān)蛋白表達(dá) 取小鼠肺組織約50 mg,剪碎,與RIPA蛋白裂解液混勻,超聲充分裂解、勻漿。低溫離心,取上清用BCA試劑盒測(cè)定蛋白濃度。以每孔30μL上樣,經(jīng)過SDS-PAGE電泳、轉(zhuǎn)膜、封閉、孵育一抗、孵育二抗、顯色等操作,應(yīng)用生物分子成像儀成像,以GAPDH蛋白條帶灰度值為參照,應(yīng)用Image J軟件分析JNK、p-JNK、ERK1/2、p-ERK1/2蛋白的表達(dá)水平。
1.4 統(tǒng)計(jì)學(xué)處理
采用SPSS 26.0軟件進(jìn)行統(tǒng)計(jì)學(xué)處理。計(jì)量資料以±s形式表示,若方差齊多組間比較采用單因素ANOVA檢驗(yàn),兩兩比較采用LSD法;若方差不齊多組間比較應(yīng)用Kruskal Wallis H檢驗(yàn),兩兩比較采用Bonferroni法。以Plt;0.05為差異有統(tǒng)計(jì)學(xué)意義。
2 結(jié)" 果
2.1 各組一般情況及FBG、體質(zhì)量比較正常對(duì)照組小鼠飲水、進(jìn)食正常,精神良好,活動(dòng)敏捷,體質(zhì)量呈穩(wěn)定增長(zhǎng);模型對(duì)照組小鼠注射STZ后出現(xiàn)明顯多尿、多飲癥狀,體質(zhì)量不增或下降,并伴有不同程度的精神萎靡、活動(dòng)量減少;ISO治療組小鼠一般情況介于正常對(duì)照組和模型對(duì)照組之間。5組小鼠FBG、體質(zhì)量比較差異均有統(tǒng)計(jì)學(xué)意義(F=30.009、63.149,Plt;0.001)。兩兩比較結(jié)果顯示:模型對(duì)照組小鼠的FBG顯著高于正常對(duì)照組(Plt;0.001),ISO低、中、高劑量組小鼠FBG較模型對(duì)照組均顯著降低(Plt;0.001);模型對(duì)照組體質(zhì)量明顯低于正常對(duì)照組(Plt;0.001),ISO低、中、高劑量組小鼠體質(zhì)量均高于模型對(duì)照組(Plt;0.01)。見表2。
2.2 各組肺組織及小動(dòng)脈變化比較
HE染色觀察顯示,正常對(duì)照組小鼠肺泡結(jié)構(gòu)正常,肺泡隔較??;模型對(duì)照組小鼠肺泡腔縮小,肺泡隔增厚,周圍有大量炎性細(xì)胞。Masson染色觀察顯示,模型對(duì)照組小鼠血管壁增厚,管腔變窄,藍(lán)色的膠原纖維明顯,周圍炎癥細(xì)胞浸潤(rùn)明顯。ISO低、中、高劑量治療組較模型對(duì)照組肺部炎性細(xì)胞浸潤(rùn)、肺小動(dòng)脈增厚、膠原纖維增多、小動(dòng)脈管腔變窄均明顯改善(圖1、2)。
2.3 各組肺組織炎性因子及血管內(nèi)皮損傷指標(biāo)mRNA表達(dá)比較
本文5組小鼠肺組織IL-1β、IL-6、TNF-α的mRNA相對(duì)表達(dá)量比較差異有統(tǒng)計(jì)學(xué)意義(H=26.791~30.254,Plt;0.001)。兩兩比較顯示:模型對(duì)照組小鼠IL-1β、IL-6、TNF-α mRNA表達(dá)顯著高于正常對(duì)照組(Plt;0.01);ISO低、中、高劑量組小鼠的IL-1β、IL-6 mRNA均低于模型對(duì)照組(Plt;0.05);ISO低、中劑量組的TNF-α的mRNA低于模型對(duì)照組(Plt;0.05),ISO高劑量組與模型對(duì)照組對(duì)比差異無統(tǒng)計(jì)學(xué)意義(P=0.147)。5組小鼠肺組織的血管內(nèi)皮損傷指標(biāo)VEGF、ET-1、ACE2 mRNA表達(dá)比較差異有統(tǒng)計(jì)學(xué)意義(F=6.994~37.569,Plt;0.05)。兩兩比較顯示:模型對(duì)照組小鼠肺組織中VEGF、ET-1的mRNA表達(dá)較正常對(duì)照組高(Plt;0.05);ISO低、中、高劑量組的VEGF、ET-1 mRNA表達(dá)低于模型對(duì)照組(Plt;0.05);模型對(duì)照組的ACE2 mRNA表達(dá)低于正常對(duì)照組(Plt;0.05),ISO中劑量組、高劑量組高于模型對(duì)照組(Plt;0.05),ISO低劑量組與模型對(duì)照組比較差異無統(tǒng)計(jì)學(xué)意義(P=0.134)。見表3、4。
2.4 各組肺組織AGEs含量比較
正常對(duì)照組、模型對(duì)照組、ISO低劑量組、ISO中劑量組、ISO高劑量組小鼠肺組織中AGEs的含量分別為(2 570.294±890.348)、(8 139.142±2 449.857)、(4 115.741±2 268.536)、(4 641.408±2 091.336)、(3 707.224±1 176.283)μg/L,各組比較差異有統(tǒng)計(jì)學(xué)意義(F=12.482,Plt;0.01),其中模型對(duì)照組較正常對(duì)照組高(Plt;0.01),ISO低、中、高劑量組低于模型對(duì)照組(Plt;0.01)。
2.5 各組JNK、p-JNK、ERK1/2、p-ERK1/2水平比較
Western Blot檢測(cè)結(jié)果顯示,各組小鼠肺組織中JNK、ERK1/2蛋白表達(dá)差異無統(tǒng)計(jì)學(xué)意義(Pgt;0.05);p-JNK/JNK、p-ERK1/2/ERK1/2比值差異有統(tǒng)計(jì)學(xué)意義(F=3.890、6.518,Plt;0.01),其中模型對(duì)照組較正常對(duì)照組高(Plt;0.05),ISO低、中、高劑量組低于模型對(duì)照組(Plt;0.05)。見圖3、表5。
3 討" 論
雖然越來越多的證據(jù)表明,糖尿病與肺部病變有關(guān)[6],但對(duì)肺小動(dòng)脈病變的研究較少。ISO對(duì)糖尿病腎病[7]、糖尿病合并非酒精性脂肪肝[8]均有改善作用。本實(shí)驗(yàn)構(gòu)建小鼠T2DM模型,觀察其肺小動(dòng)脈病變情況;應(yīng)用ISO干預(yù),檢測(cè)FBG、IL-1β、IL-6、TNF-α、AGEs、ET-1、VEGF、ACE2、JNK、p-JNK、ERK1/2、p-ERK1/2等指標(biāo)變化。結(jié)果顯示,T2DM小鼠存在肺小動(dòng)脈病變,ISO通過降低血糖、炎性反應(yīng)、氧化應(yīng)激等途徑作用于JNK、ERK1/2信號(hào)轉(zhuǎn)導(dǎo)通路,從而改善肺小動(dòng)脈病變。
高糖血癥是小動(dòng)脈病變的危險(xiǎn)因素,它可以直接或間接損傷內(nèi)皮細(xì)胞,促使炎癥反應(yīng)的發(fā)生。此外,高糖血癥還會(huì)引起氧化應(yīng)激、AGEs生成增加等,進(jìn)一步誘發(fā)內(nèi)皮細(xì)胞的凋亡[9]。本實(shí)驗(yàn)結(jié)果顯示,T2DM模型小鼠肺小動(dòng)脈周圍炎性細(xì)胞浸潤(rùn),F(xiàn)BG和肺組織中IL-1β、IL-6、TNF-α mRNA表達(dá)以及AGEs含量較高;ISO干預(yù)后,上述指標(biāo)均有改善。表明ISO可以降低T2DM模型小鼠血糖、減輕炎性反應(yīng)及氧化應(yīng)激。
ET-1是體內(nèi)血管內(nèi)皮細(xì)胞損傷的特異性標(biāo)志物,VEGF能夠促進(jìn)新血管形成[10],ACE2通過降解Ang Ⅱ來保護(hù)血管[11]。本研究結(jié)果顯示,與正常對(duì)照組比較,模型對(duì)照組小鼠VEGF、ET-1表達(dá)升高,ACE2表達(dá)下降,表明模型對(duì)照組小鼠肺小動(dòng)脈血管內(nèi)皮細(xì)胞受到了損傷;ISO干預(yù)后,上述指標(biāo)有所改善,提示ISO對(duì)T2DM小鼠肺小動(dòng)脈具有保護(hù)作用。
《2型糖尿病患者泛血管疾病風(fēng)險(xiǎn)評(píng)估與管理中國(guó)專家共識(shí)(2022版)》指出,糖尿病微血管病變可能與MAPKs通路相關(guān)[12]。JNK和ERK1/2作為MAPKs通路的兩個(gè)重要分支,分別在炎癥、細(xì)胞凋亡以及細(xì)胞生長(zhǎng)、分化等過程中發(fā)揮重要作用。IL-1β、IL-6、TNF-α等炎性因子增加,VEGF與受體結(jié)合,AGEs的堆積,均能激活JNK通路,使肺小動(dòng)脈產(chǎn)生系列應(yīng)答反應(yīng),致使血管內(nèi)皮受損、重構(gòu)。AGEs累積及ET-1、VEGF與其受體結(jié)合均可激活ERK1/2通路,磷酸化的蛋白介導(dǎo)平滑肌細(xì)胞的增殖與遷移,在小動(dòng)脈病變中起到重要作用[13]。另外,ACE2不僅可以通過下調(diào)ERK1/2的磷酸化水平而抑制平滑肌增殖[14],還可以抑制氧化應(yīng)激及炎性反應(yīng)而改善血管內(nèi)皮功能障礙[15]。所以,高糖環(huán)境下炎癥因子、氧化應(yīng)激、內(nèi)皮血管損傷等因素并非獨(dú)立存在,而是相互影響、共同作用于JNK、ERK1/2信號(hào)通路,參與T2DM肺小動(dòng)脈的病變。
綜上所述,T2DM小鼠存在肺小動(dòng)脈病變,ISO可以對(duì)抗T2DM小鼠肺小動(dòng)脈病變的發(fā)生,其機(jī)制為降低血糖、抑制炎性反應(yīng)、減輕氧化應(yīng)激、減輕血管內(nèi)皮細(xì)胞損傷以及抑制JNK、ERK1/2信號(hào)轉(zhuǎn)導(dǎo)通路激活等。本文結(jié)果為T2DM肺小動(dòng)脈病變的防治提供了新思路。本實(shí)驗(yàn)中低、中、高劑量ISO對(duì)相關(guān)指標(biāo)的作用并不呈劑量依賴性,具體機(jī)制還需要進(jìn)一步研究。
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(本文編輯 黃建鄉(xiāng))