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缺血后处理对大鼠肝再生及能量代谢的影响 被引量:1

Effects of ischemic postconditioning on liver regeneration and energy metabolism in rats
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摘要 目的探讨缺血后处理对大鼠肝大部切除合并缺血再灌注损伤后残肝再生的影响。方法健康清洁级雄性SD大鼠90只,体质量230-280g。按随机数字表法将其随机分为单纯肝切除组(SH)、缺血再灌注组(IR)、后处理组(IPO)。各组大鼠肝左、中叶切除,残肝(右、尾叶)做不同处理:SH组不阻断其血流,IR组阻断血流30min后恢复灌注,IPO组阻断血流30min,并于恢复灌注前进行30-30s循环3次IPO。术后1、6、12、24、48h取各组大鼠下腔静脉血及残肝组织,测定血清丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)、HGF、残肝组织PCNA阳性细胞比率和ATP、ADP、AMP含量,并计算残肝再生度。结果(1)IPO组1-48h各时点ALT、AST活性分别是(138±20)、(340±22)、(770±55)、(389±60)、(113±25)U/L和(247±31)、(509±51)、(972±77)、(955±159)、(222±44)U/L,明显低于IR组相应时点的ALT、AST活性,分别为(2944±37)、(560±69)、(1222±162)、(540±40)、(161±15)U/L和(439±34)、(669±94)、(1347±118)、(1274±223)、(403.4±68)U/L(均P〈0.05);(2)IPO组24、48h肝再生度(18.8%4-3.2%、34.0%4±3.5%)和PCNA阳性细胞比率(43.9%±2.7%、56.2%±4.0%)分别高于IR组的(11.3%.4±2.9%、26.8%±2.5%)和(34.5%4-2.8%、48.8%.4±1.8%)(P〈0.05);(3)IPO组24、48 h HGF水平[(2614±54)和(2524±103)pg/m]明显高于IR组[(99±47)和(70±19)pg/ml](P〈0.05);(4)IPO组24、48h肝组织ATP含量分别为(22.20±3.6)和(12.87±2.49)μg∥g,明显高于相应时点的IR组含量(P〈0.05),但低于同时点的SH组含量(P〈0.05)。结论缺血后处理对肝大部切除合并缺血再灌注后残肝的再生具有促进作用,其机制与促进HGF生成,维持肝脏的能量代谢有关。 Objective To explore the effects of ischemic postconditioning on the remnant liver regeneration under ischemic reperfusion after subtotal hepatectomy. Methods A total of 90 male SD rats weighting 230 - 280 g were randomly divided into 3 groups of simple subtotal hepatectomy ( SH), ischemia reperfusion (IR) and ischemic postconditioning (IPO). The left and middle liver lobes were resected. And the remnant liver was treated as follows : blood flow was non-blocked in SH group, but blocked for 30 rain in IR group, then reperfused. The IPO group was established by 30 -30 s intermittent interruptions of blood flow thrice during the early phase of reperfusiorL At 1, 6, 12, 24, 48 h respectively, the serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), hepatocyte growth factor (HGF) and the positive ratio of proliferating cell nuclear antigen (PCNA) were detected. Also the contents of adenosine triphosphate (ATP), adenosine diphosphate (ADP) and adenosine monophosphate (AMP) were measured and the regenerated liver weight was calculated. Results The activities of ALT and AST in IPO group from 1-48 h were (138 ±20),(340±22), (770±55), (389±60), (113 ±25)U/L and (247 ±31), (509 ±51), (972 ± 77), (955 ± 159), (222 ± 44)U/L respectively at each timepoint and they weresignificantly lower than those (294 ± 37 ), (560 ± 69 ), ( 1222 ± 162 ), (540 ± 40), ( 161 ± 15 ) U/L and (439 ±34) ,(669±94), ( 1347 ± 118), ( 1274 ±223), (403 ± 68) U/L in IR group (P 〈0. 05) ; the regenerated liver weight ( 18. 8 ±3. 2, 34. 0 ± 3. 5 % ) and positive cell ratio of PCNA ( 43. 9 ± 2. 7, 56. 2 ±4. 0% ) in IPO group at 24 and 48 h were respectively higher than those in IR group ( ( 11.3 ± 2. 9 ), (26.8±2.5)% and (34.5±2.8), (48.8 ±1.8)%)(P〈0.05); The HGFlevels ((261 ±54) and (252 ± 103) pg/ml) at 24 and 48 h in IPO group were significantly higher than those( (99 ±47) and (70 ± 19) pg/ml) in IR group (P 〈0. 05) ; the contents of ATP in hepatic tissue at 24 and 48 h in IPO group were (22. 20 ± 3.6) and (12. 87 ± 2. 49) μg/g respectively. And they were significantly higher than those in IR group ( P 〈 0. 05 ), but lower than those in SH group ( P 〈 0. 05 ). Conclusion Ischemie postconditioning improves the remnant liver regeneration under ischemic reperfusion after subtotal hepatectomy through its actions of stimulating HGF production and maintaining hepatic energy metabolism.
出处 《中华医学杂志》 CAS CSCD 北大核心 2012年第37期2601-2606,共6页 National Medical Journal of China
基金 陕西省科技攻关项目(2008K14-02)
关键词 缺血后处理 再灌注损伤 肝再生 能量代谢 Ischemic postconditioning Reperfusion injury Hepatic regeneration Energymetabolism
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