目的:探讨硫氢化钠(NaHS)对大鼠肺缺血/再灌注(I/R)引发的细胞焦亡及己糖激酶2(HK2)-核苷酸结合寡聚化结构域样受体蛋白3(NLRP3)-消皮素D(GSDMD)通路的影响.方法:将雄性SD大鼠随机分为6组,每组6只:对照(control)组、control+NaHS组、I/R组、低剂量NaHS+I/R(L+I/R)组、中剂量NaHS+I/R(M+I/R)组和高剂量NaHS+I/R(H+I/R)组.于造模前30 min腹腔注射1.5 mL NaHS溶液.在缺血30 min、再灌注1 h时立即取左肺组织,记录并计算肺湿/干重比和总肺含水量;HE染色观察肺组织形态;试剂盒检测丙二醛、髓过氧化物酶和乳酸水平;ELISA检测白细胞介素1β(IL-1β)和IL-18水平;Western blot、qRT-PCR和免疫荧光染色检测糖酵解和细胞焦亡相关指标表达变化.结果:与control组相比,control+NaHS组各项检测指标均无显著差异(P>0.05),I/R组可见明显肺损伤,氧化应激反应和乳酸含量显著增加,糖酵解和细胞焦亡相关指标上调(P<0.05或P<0.01);与I/R组相比,L+I/R组以上检测指标显著下降(P<0.01)或无显著差异(P>0.05),M+I/R组以上检测指标不同程度降低(P<0.05或P<0.01),而H+I/R组以上各项指标均无显著差异(P>0.05).结论:中剂量(56 μmol·L-1·kg-1)NaHS通过抑制HK2-NLRP3-GSDMD通路减少细胞焦亡的发生,从而减轻大鼠肺I/R损伤.
Effects of sodium hydrosulfide on HK2-NLRP3-GSDMD pathway and pyroptosis induced by lung ischemia/reperfusion in rats
AIM:To investigate the effects of sodium hydrosulfide(NaHS)on hexokinase 2(HK2)-nucleo-tide-binding oligomerization domain-like receptor protein 3(NLRP3)-gasdermin D(GSDMD)pathway and pyroptosis in-duced by lung ischemia/reperfusion(I/R)in rats.METHODS:Male Sprague-Dawley rats were divided into 6 groups:control group,control+NaHS group,I/R group,low-dose NaHS+I/R(L+I/R)group,medium-dose NaHS+I/R(M+I/R)group,and high-dose NaHS+I/R(H+I/R)group,with 6 rats in each group.The NaHS was administered via intraperi-toneal injection at 1.5 mL,30 min before modeling.The left lung tissues were collected 30 min after ischemia and 1 h af-ter reperfusion,and the wet/dry weight ratio and total lung water content were recorded.Hematoxylin-eosin(HE)staining was used to examine lung tissue morphological changes.The levels of malondialdehyde(MDA),myeloperoxidase(MPO)and lactate in lung tissues were measured with test kits.ELISA was employed to determine the levels of interleukin-1β(IL-1β)and IL-18.The expression of glycolysis-and pyroptosis-related indicators was analyzed by Western blot,qRT-PCR and immunofluorescence staining.RESULTS:Compared with control group,the rats in NaHS group showed no signifi-cant differences in all laboratory tests(P>0.05).The rats in I/R group exhibited significant lung injury,oxidative stress,increased lactate level,and up-regulated glycolysis and pyroptosis(P<0.05 or P<0.01).Compared with I/R group,the indicators in L+I/R group showed a downward trend(P<0.01)or no difference(P>0.05),while those in M+I/R group dis-played a significant reduction(P<0.05 or P<0.01).However,the indexes in H+I/R group exhibited no significant dif-ferences in these tests(all P>0.05).CONCLUSION:A moderate dose(56 μmol·L-1·kg-1)of NaHS mitigated the oc-currence of pyroptosis by inhibiting the HK2-NLRP3-GSDMD pathway,thus contributing to the attenuation of lung I/R in-jury in rats.
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