医学研究生学报
醫學研究生學報
의학연구생학보
JOURNAL OF MEDICAL POSTGRADUATE
2014年
8期
806-809
,共4页
张志坚%吴灿%田黎%首云峰%彭礼波
張誌堅%吳燦%田黎%首雲峰%彭禮波
장지견%오찬%전려%수운봉%팽례파
百草枯%肺损伤%细胞凋亡%内质网应激%沙苑子总黄酮
百草枯%肺損傷%細胞凋亡%內質網應激%沙苑子總黃酮
백초고%폐손상%세포조망%내질망응격%사원자총황동
Paraquat%Lung injury%Apoptosis%Endoplasmic reticulum stress%Total flavonoids from astragalus complanatus
目的:肺组织是百草枯中毒后主要损伤的靶器官,但其具体机制目前尚未完全清楚。内质网应激( endoplasmic reticulum stress, ERS)与中毒相关性疾病密切相关,但其与百草枯中毒后肺损伤的关系鲜见报道。文中探讨ERS诱导的细胞凋亡在大鼠百草枯中毒后急性肺损伤(acute lung injury, ALI)中的作用及观察中药沙苑子黄酮(total flavonoids from astragalus complanatus, FAC)对其影响。方法30只Spragne-Dawley(SD)大鼠按随机数字表法分为对照组、肺损伤模型组(ALI组)和沙苑子黄酮处理组( ALI+FAC组)。采用生物化学法检测肺组织超氧化物歧化酶( SOD)、过氧化氢酶( CAT)和丙二醛( MDA)含量;采用原位末端标记( TUNEL)法观察肺组织凋亡情况;采用Western blot 及RT-PCR检测ALI后CCAAT增强子结合蛋白( C/EBP)同源蛋白( C/EBP homologous protein ,CHOP)、活化的转录因子4( activating transcription factor 4,ATF4)和X-盒结合蛋白-1(X-box binding protein 1, XBP1)基因表达的改变;HE染色观察肺组织病理变化。结果与对照组相比,ALI组的肺组织中MDA水平明显升高[(3.26±0.24) vs (5.04±0.36),P<0.01],SOD和CAT活性明显降低,分别为[(300.26±35.69) vs (187.21±25.66)]、[(5.78±1.28) vs (2.15±1.12),P<0.01],细胞凋亡数增多,CHOP蛋白表达上调[(0.74±0.20) vs (0.23±0.07),P<0.01],XBP-1、ATF4和CHOP mRNA表达水平明显上调。而沙苑子黄酮作用后,肺组织MDA含量减少[(5.04±0.36) vs (3.99±0.27),P<0.01],SOD和CAT活性增加,细胞凋亡明显减少,CHOP蛋白表达下调[(0.74±0.20) vs (0.42±0.11),P<0.01],ATF4、XBP1和CHOP基因表达下调。结论内质网应激诱导的细胞凋亡参与百草枯中毒后肺损伤过程,沙苑子黄酮对百草枯中毒后肺组织保护作用与其减轻ERS诱导的细胞凋亡有关。
目的:肺組織是百草枯中毒後主要損傷的靶器官,但其具體機製目前尚未完全清楚。內質網應激( endoplasmic reticulum stress, ERS)與中毒相關性疾病密切相關,但其與百草枯中毒後肺損傷的關繫鮮見報道。文中探討ERS誘導的細胞凋亡在大鼠百草枯中毒後急性肺損傷(acute lung injury, ALI)中的作用及觀察中藥沙苑子黃酮(total flavonoids from astragalus complanatus, FAC)對其影響。方法30隻Spragne-Dawley(SD)大鼠按隨機數字錶法分為對照組、肺損傷模型組(ALI組)和沙苑子黃酮處理組( ALI+FAC組)。採用生物化學法檢測肺組織超氧化物歧化酶( SOD)、過氧化氫酶( CAT)和丙二醛( MDA)含量;採用原位末耑標記( TUNEL)法觀察肺組織凋亡情況;採用Western blot 及RT-PCR檢測ALI後CCAAT增彊子結閤蛋白( C/EBP)同源蛋白( C/EBP homologous protein ,CHOP)、活化的轉錄因子4( activating transcription factor 4,ATF4)和X-盒結閤蛋白-1(X-box binding protein 1, XBP1)基因錶達的改變;HE染色觀察肺組織病理變化。結果與對照組相比,ALI組的肺組織中MDA水平明顯升高[(3.26±0.24) vs (5.04±0.36),P<0.01],SOD和CAT活性明顯降低,分彆為[(300.26±35.69) vs (187.21±25.66)]、[(5.78±1.28) vs (2.15±1.12),P<0.01],細胞凋亡數增多,CHOP蛋白錶達上調[(0.74±0.20) vs (0.23±0.07),P<0.01],XBP-1、ATF4和CHOP mRNA錶達水平明顯上調。而沙苑子黃酮作用後,肺組織MDA含量減少[(5.04±0.36) vs (3.99±0.27),P<0.01],SOD和CAT活性增加,細胞凋亡明顯減少,CHOP蛋白錶達下調[(0.74±0.20) vs (0.42±0.11),P<0.01],ATF4、XBP1和CHOP基因錶達下調。結論內質網應激誘導的細胞凋亡參與百草枯中毒後肺損傷過程,沙苑子黃酮對百草枯中毒後肺組織保護作用與其減輕ERS誘導的細胞凋亡有關。
목적:폐조직시백초고중독후주요손상적파기관,단기구체궤제목전상미완전청초。내질망응격( endoplasmic reticulum stress, ERS)여중독상관성질병밀절상관,단기여백초고중독후폐손상적관계선견보도。문중탐토ERS유도적세포조망재대서백초고중독후급성폐손상(acute lung injury, ALI)중적작용급관찰중약사원자황동(total flavonoids from astragalus complanatus, FAC)대기영향。방법30지Spragne-Dawley(SD)대서안수궤수자표법분위대조조、폐손상모형조(ALI조)화사원자황동처리조( ALI+FAC조)。채용생물화학법검측폐조직초양화물기화매( SOD)、과양화경매( CAT)화병이철( MDA)함량;채용원위말단표기( TUNEL)법관찰폐조직조망정황;채용Western blot 급RT-PCR검측ALI후CCAAT증강자결합단백( C/EBP)동원단백( C/EBP homologous protein ,CHOP)、활화적전록인자4( activating transcription factor 4,ATF4)화X-합결합단백-1(X-box binding protein 1, XBP1)기인표체적개변;HE염색관찰폐조직병리변화。결과여대조조상비,ALI조적폐조직중MDA수평명현승고[(3.26±0.24) vs (5.04±0.36),P<0.01],SOD화CAT활성명현강저,분별위[(300.26±35.69) vs (187.21±25.66)]、[(5.78±1.28) vs (2.15±1.12),P<0.01],세포조망수증다,CHOP단백표체상조[(0.74±0.20) vs (0.23±0.07),P<0.01],XBP-1、ATF4화CHOP mRNA표체수평명현상조。이사원자황동작용후,폐조직MDA함량감소[(5.04±0.36) vs (3.99±0.27),P<0.01],SOD화CAT활성증가,세포조망명현감소,CHOP단백표체하조[(0.74±0.20) vs (0.42±0.11),P<0.01],ATF4、XBP1화CHOP기인표체하조。결론내질망응격유도적세포조망삼여백초고중독후폐손상과정,사원자황동대백초고중독후폐조직보호작용여기감경ERS유도적세포조망유관。
Objective Paraquat(PQ) is an effective herbicide which is widely used in agricultural production .PQ poisoning is frequently seen in humans with the lung as the target organ ,but the poisoning mechanisms is not very clear .Studies show that endoplasmic reticulum stress(ERS) is closely associated with poisoning , but there are few reports on the relationship between ER stress and PQ poi-soning.This article was to investigate the effects of ERS-induced apoptosis and total flavonoids from astragalus complanatus (FAC) in a-cute lung injury(ALI) following paraquat poisoning in rats . Methods A total of 30 adult healthy Sprague-Dawley (SD) rats were ran-domly divided into 3 groups:control group, ALI group, ALI+FAC group and ALI+saline group.Biochemical method was applied to de-tect superoxide dismutase (SOD), catalase (CAT) and malondialdehyde (MDA) in lung tisssue,TdT-mediated dUTP nick end labeling (TUNEL) assay in observing lung apoptosis, Western blotting and real-time PCR(RT-PCR) in detecting the changes in expressions of C/EBP homologous peotein (CHOP), activating transcription factor 4 (ATF4) and X-box binding protein 1 (XBP) following ALI, and HE staining in observing the pathological changes of lung tissue . Results Compared with control group , the expression of MDA content was enhanced in ALI group ([3.26 ±0.24] vs [5.04 ±0.36],P<0.01), along with significantly decreased activity of SOD and CAT ([300.26 ±35.69] vs [187.21 ±25.66]), ([5.78 ±1.28] vs [2.15 ±1.12],P<0.01), increased cell apoptosis , upregulated pro-tain level of CHOP ([0.74 ±0.20] vs [0.23 ±0.07],P<0.01) and mRNA expression of ATF4, XBP1 and CHOP.However, FAC sig-nificantly attenuated ALI following PQ , as showed by reduced MDA content , enhanced activity of SOD and CAT , decreased cell apopto-sis, inhibited protain level of CHOP and mRNA expression of ATF 4, XBP1 and CHOP ([5.04 ±0.36] vs [3.99 ±0.27],P<0.01). Furthermore, the activity of SOD and CAT were higher in FAC pretreatment group than those in ALI group ([ 0.74 ±0.20 ] vs [0.42 ±0.11],P<0.01). Conclusion From the research, ERS-induced cell apoptosis is involved in ALI following PQ , and the protec-tive role of FAC in lung tissue following PQ is due to its effect in atten-uating ERS-induced apoptosis .