滕娜 孫明潔 李會
[摘要] 目的 探討吸入氫氣(H2)對重癥急性胰腺炎(SAP)大鼠肺損傷的影響。 方法 選取健康雄性SPF級Wistar大鼠48只,采用隨機數(shù)字表法分為四組(每組12只):假手術(shù)組(SH組)、重癥胰腺炎組(SAP組)、1%H2組、2%H2組。除SH組,各組通過逆行胰膽管注射5%?;悄懰徕c的方法制作大鼠SAP模型。1%H2組和2%H2組在模型制作過程中及造模成功后24 h持續(xù)吸入相應(yīng)濃度的H2。造模后24 h采集股動脈血行血氣分析并計算氧合指數(shù)(PaO2/FiO2),隨后處死大鼠測定肺濕干重比(W/D)并進行肺組織損傷評分,酶聯(lián)免疫吸附法測定肺組織中8-羥基脫氧鳥苷(8-OHdG)、Toll樣受體4(TLR-4)、核因子-κB(NF-κB)、腫瘤壞死因子-α(TNF-α)、白細胞介素-1β(IL-1β)、IL-6水平。 結(jié)果 與SH組比較,SAP組、l%H2組、2%H2組的W/D比值、肺組織損傷評分、8-OHdG、TLR-4、NF-κB、TNF-α、IL-1β、IL-6顯著升高,PaO2/FiO2降低(P < 0.05)。與SAP組比較,1%H2組、2%H2組的W/D比值、肺組織損傷評分、8-OHdG、TLR-4、NF-κB、TNF-α、IL-1β、IL-6顯著降低,PaO2/FiO2升高(P < 0.05)。1%H2組與2%H2組上述各指標比較,差異無統(tǒng)計學(xué)意義(P > 0.05)。 結(jié)論 吸入H2能減輕重癥急性胰腺炎所致肺損傷,其機制可能與抑制炎性反應(yīng)和氧化應(yīng)激有關(guān)。
[關(guān)鍵詞] 氫氣;胰腺炎;肺損傷;大鼠
[中圖分類號] R657.5? ? ? ? ? [文獻標識碼] A? ? ? ? ? [文章編號] 1673-7210(2020)05(c)-0026-04
Effect of hydrogen inhalation on lung injury induced by severe acute pancreatitis in rats
TENG Na? ?SUN Mingjie? ?LI Hui▲
Department of Anesthesia Operating, Qingdao Municipal Hospital, Shandong Province, Qingdao? ?266011, China
[Abstract] Objective To investigate the effect of hydrogen(H2) inhalation on lung injury in rats with severe acute pancreatitis (SAP). Methods Forty-eight healthy male SPF Wistar rats were selected, four groups (12 in each group) were divided into 4 groups by random number table method, sham operation group (SH group), severe pancreatitis group (SAP group), 1%H2 group, 2%H2 group. With the exception of SH group, the rat SAP model was made by injecting 5% sodium taurocholate into each group through retrograde cholangiopancreatine. H2 group 1% and H2 group 2% continuously inhaled H2 at the corresponding concentration during the process of model making and 24 h after successful model making. Blood gas analysis and oxygenation index (PaO2/FiO2) were calculated after 24 h of femoral arterial blood collection after modeling. The rats were then sacrificed to determine the lung wet-to-dry weight ratio (W/D) and the lung tissue injury score. The enzyme linked immunosorbent method was used for determination of levels of 8-hydroxyl deoxyguanosine (8-OHdG), toll-like receptor 4 (TLR-4), nuclear factor-κB (NF-κB), tumor necrosis factor-α (TNF-α), interleukin 1β (IL-1β), IL-6 in the lung tissues. Results Compared with SH group, the W/D ratio of SAP group, 1%H2 group, 1%H2 group were analyzed, the lung tissue damage rating, 8-OHdG, TLR-4, NF-κB, TNF-α, IL-1β, IL-6 and IL-1 increased significantly, PaO2/FiO2 decreased (P < 0.05). Compared with SAP group, W/D ratio, lung tissue damage rating, 8-OHdG, TLR-4, NF-κB, TNF-α, IL-1β, IL-6 and IL-1 in 1%H2 group and 2%H2 group significantly reduced, PaO2/FiO2 elevated (P < 0.05). There was no significant difference in the above indicators between the 1%H2 group and the 2%H2 group (P > 0.05). Conclusion Inhalation of H2 can reduce lung injury caused by severe acute pancreatitis, and the mechanism may be related to inhibition of inflammatory response and oxidative stress.
H2是一種電中性的小分子,細胞膜通透性強,可自由進入細胞內(nèi),順利到達靶器官[9-10]。由于半衰期短,只能在持續(xù)吸入H2過程中才能發(fā)揮其生物作用[11-12]。本研究在制作重癥胰腺炎模型全程中持續(xù)吸入1%、2%H2。與SAP組比較,吸入1%H2、2%H2能明顯降低胰腺炎導(dǎo)致的肺損傷,改善肺功能。
氧自由基具有很強的氧化性,尤其是細胞毒性極強的羥自由基,直接損傷肺泡細胞膜和肺血管內(nèi)皮[13]。8-OHdG是DNA氧化損傷最重要且敏感的標志物,也是評價機體氧化損傷的指標[14-15]。本研究中,與SH組比較,各組8-OHdG均有不同程度升高(P < 0.05),提示重癥胰腺炎導(dǎo)致明顯的肺組織氧化損傷。而與SAP組比較,吸入1%、2%H2能夠明顯降低肺組織中8-OHdG水平,結(jié)果提示吸入H2可能通過抑制氧化應(yīng)激,減輕重癥胰腺炎導(dǎo)致肺損傷。
TLR-4是誘導(dǎo)炎性反應(yīng)的門戶蛋白,研究顯示它在多種病理反應(yīng)中起重要作用[16-17]。重癥胰腺炎時有大量的炎性因子釋放入血[18],可激活Toll-4信號通路,通過多種途徑使作為炎性反應(yīng)下游環(huán)節(jié)的NF-κB活化,活化的NF-κB進入核內(nèi)調(diào)節(jié)相應(yīng)基因的表達,可誘導(dǎo)產(chǎn)生多種促炎性細胞因子(如TNF-α等)的表達[19]。TNF-α是炎性反應(yīng)重要的啟動因子,能在細胞以及亞細胞水平上發(fā)生級聯(lián)反應(yīng),誘導(dǎo)IL-1β、IL-6產(chǎn)生,在全身炎性反應(yīng)尤其是肺損傷中的發(fā)揮著重要作用[20-22]。本研究結(jié)果顯示,和SH組比較,l%H2組和2%H2組的NF-кB、TNF-α、IL-1β、IL-6表達水平明顯升高(P < 0.05),而吸入H2明顯抑制炎癥介質(zhì)表達。
綜上所述,吸入H2能明顯減輕急性胰腺炎所致肺損傷,其機制可能與抑制氧化應(yīng)激和炎性反應(yīng)有關(guān)。
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