p38 mitogen-activated protein kinase mediates the sustained phase of hypoxic pulmonary vasoconstriction and plays a role in phase I vasodilation

Hypoxic pulmonary vasoconstriction (HPV) and pulmonary hypertension present common and formidable clinical problems for thoracic, transplant, and trauma surgeons. We hypothesized that acute hypoxia causes pulmonary artery (PA) contraction and that p38 mitogen-activated protein (MAP) kinase is a key mediator in that process. To test this hypothesis, we measured isometric force displacement in isolated rat pulmonary artery rings during hypoxia in the presence and absence of the selective p38 MAP kinase inhibitor SB-20358, and stimulator anisomycin. In separate experiments, we measured the functional effects in isolated rat pulmonary artery rings of inhibiting p38 MAP kinase during normoxic conditions. p38 MAP kinase inhibition significantly attenuated the delayed, but not early, contractile phase of HPV. Additionally, stimulation of p38 MAP kinase significantly decreased the phase I vasodilation of HPV. Under normoxia conditions, there was no statistically significant difference in isometric force displacement between control and p38 MAPK inhibitor-treated pulmonary artery rings. We conclude that p38 MAP kinase may be a key mediator in the pathogenesis of HPV and that further understanding may lead to new therapies for HPV associated with acute lung injury.     

重症急性胰腺炎大鼠p38丝裂原活化蛋白激酶的表达与肺毛细血管内皮屏障损伤

目的研究p38丝裂原活化蛋白激酶（p38 mitogen-activated protein kinase,p38MAPK）在重症急性胰腺炎（severe acute pancreatitis,SAP）大鼠肺组织中的表达情况,并初步探讨p38MAPK与SAP肺毛细血管内皮屏障损伤的关系。方法将40只健康雄性SD大鼠随机（随机数字表法）分为假手术（SO）组和SAP组,SAP组又再分为3、6、12及24 h 4个时间点组,共5组,每组8只。采用胰胆管逆行注射5%牛磺胆酸钠的方法建立SAP大鼠模型。采用HE染色方法观察大鼠肺和胰腺组织的病理学改变;采用ELISA法检测血清肿瘤坏死因子-α（TNF-α）和白细胞介素-1β（IL-1β）水平;采用免疫组化染色方法检测肺组织中磷酸化p38（p-p38）蛋白和水通道蛋白1（AQP1）的表达水平;采用实时定量荧光PCR法（real-time PCR）检测肺组织中AQP1 mRNA的表达水平。结果 SAP各时间点组大鼠肺组织充血水肿,炎症细胞浸润;胰腺组织可见大片坏死,部分腺叶结构模糊甚至消失;血清TNF-α和IL-1β水平均较SO组高（P〈0.05）。SO组大鼠肺组织中p-p38蛋白仅有微量表达,而在SAP3 h组,p-p38蛋白的表达就明显上调,在6 h时达高峰,24 h时仍高于SO组（P〈0.05）。SAP各时间点组大鼠肺组织中AQP1 mRNA及其蛋白的表达水平均较SO组下降（P〈0.05）,并随着时间的推移而逐渐下降;SAP组大鼠AQP1 mRNA的表达与TNF-α、IL-1β及p-p38蛋白之间均存在负相关关系（r=-0.87,P〈0.05;r=-0.88,P〈0.05;r=-0.78,P〈0.05）。结论肺组织中AQP1蛋白表达的下调是SAP肺毛细血管内皮屏障损伤的重要原因之一,其可能与p38MAPK的激活及炎症因子的过度释放有关。     

Cholinergic receptor induction and JNK activation in acute pancreatitis

BACKGROUND: Cholecystokinin-A (CCK-A) and cholinergic receptor pathways, capable of activating stress kinases p38 mitogen-activated protein kinase (p38(MAPK)) and cJUN N-terminal kinase (JNK), are implicated in the pathogenesis of ligation-induced acute pancreatitis in rats. As ligation-induced acute pancreatitis in rats is associated with CCK-A receptor induction and p38(MAPK) activation, and as receptor induction could amplify acinar hyperstimulation and exacerbate cell stress, we tested the hypothesis that the cholinergic M3 receptor is induced and JNK is activated in this model. METHODS: Cholinergic M3 receptor expression and JNK activation was compared in rats 1, 3, or 24 hours after sham operation or duct ligation. RESULTS: Immunoblot analysis of pancreatic homogenates showed a time-dependent increase in cholinergic M3 receptor protein, total JNK, and phospho-JNK after duct ligation. CONCLUSIONS: There is a rapid and progressive cholinergic M3 receptor induction and JNK activation in ligation-induced acute pancreatitis in rats. These findings may have significance in the mechanism of disease pathogenesis.     

骨髓间充质干细胞对急性胰腺炎大鼠p38丝裂原活化蛋白激酶信号通路表达的影响

目的 观察骨髓间充质干细胞(MSCs)对急性胰腺炎(AP)大鼠p38丝裂原活化蛋白激酶(p38MAPK)信号通路的影响,探讨其减轻胰腺炎的作用机制.方法 采用腹腔注射L-精氨酸建立大鼠AP模型.SD大鼠随机分4组:AP未治疗组(24只);MSCs移植组(24只);p38MAPK抑制组(24只)和正常对照组(6只).流式细胞术检测MSCs表面标记物;逆转录-聚合酶链反应(RT-PCR)方法检测胰腺组织p38MAPK mRNA表达变化;同时观察组织形态学改变.结果 (1)未治疗组大鼠在建模后1h时胰腺组织p38MAPK mRNA表达显著升高并达到顶峰(P＜0.01);移植MSCs后表达明显降低,与正常对照组比较,差异无统计学意义(P＞0.05).(2)未治疗组血清炎性因子水平分别为:肿瘤坏死因子(TNF)-α(614.8 ±54.6)ng/L、白细胞介素(IL)-1(3040.5±506.4)ng/L、IL-17(4.5±0.4)U/L,胰腺组织中性粒细胞趋化因子(CINC)和单核粒细胞趋化因子(MCP-1)染色阳性率均明显升高(P＜0.05);移植MSCs后,CINC、MCP-1染色阳性率显著下降,血清炎性因子水平分别为:TNF-α( 277.5±60.8)ng/L、IL-1( 1056.2±563.1)ng/L、IL-17(1.2±0.4)U/L,两组比较差异有统计学意义(P＜0.05).(3)胰腺组织苏木素-伊红(HE)染色显示,未治疗组有大量炎性细胞浸润,胰腺细胞破坏明显,腺体结构紊乱,而移植组仅见少量炎性细胞浸润,细胞偶有破坏,排列整齐,结构有序.结论 急性胰腺炎时,胰腺组织内p38MAPK mRNA表达上调,胰腺组织损伤严重.MSCs移植可以明显抑制p38MAPK mRNA表达,降低胰腺组织内趋化因子和血清炎性因子水平,从而减轻胰腺损伤.     

Bile-pancreatic juice exclusion increases cholinergic M3 and CCK-A receptor expression and interleukin-6 production in ligation-induced acute pancreatitis

BACKGROUND: Using an original model, the Donor Rat Model, we showed that bile-pancreatic juice (BPJ) exclusion from gut exacerbates ligation-induced acute pancreatitis in rats. We also showed that muscarinic cholinergic M3 and CCK-A receptor expression is induced following duct ligation. Increased receptor number potentially could exacerbate cytokine production. We hypothesize that BPJ exclusion is responsible for M3 and CCK-A receptor induction and increased interleukin-6 (IL-6) production. METHODS: M3 and CCK-A receptor expression and IL-6 production were compared in rat pancreata 1 to 3 hours after duct ligation with or without BPJ replacement. RESULTS: Our studies showed that BPJ replacement attenuates duct ligation-induced increases in M3 and CCK-A receptor expression and IL-6 production. CONCLUSIONS: In this model, BPJ exclusion from gut induces M3 and CCK-A receptor expression and increases IL-6 production. In this experimental corollary of gallstone pancreatitis, BPJ exclusion from gut may play a key role in the mechanism of disease pathogenesis.     

p38MAPK与 ERK1/2的协同效应及对成骨细胞分化的调控

 目的探讨骨髓间质干细胞(bone marrow mesenchymal stem cells,BMSCs)向成骨细胞分化过程中 p38MAPK与 ERK1/2的协同效应及其机制。方法以成骨细胞分化添加剂诱导小鼠 BMSCs向成骨细胞分化,测定碱性磷酸酶活性和钙沉积量。检测磷酸化 p38MAPK和磷酸化 ERK1/2(p-ERK1/2)的表达水平评估通路的激活状况。以 SB203580或 PD98059阻断 p38MAPK或 ERK1/2通路,观察对成骨细胞分化的影响。以 SB203580或亚砷酸钠阻断或激活 p38MAPK通路,观察 p-ERK1/2的变化。以冈田酸抑制蛋白磷酸酯酶 2A(protein phosphatases type 2A,PP2A)活性,观察 p-ERK1/2的变化及对成骨细胞分化的影响。通过免疫共沉淀实验观察 PP2A和 ERK1/2间的结合及 SB203580对结合的影响。结果成骨细胞分化添加剂诱导 BMSCs向成骨细胞分化的过程伴有 ERK1/2和 p38MAPK通路的激活, SB203580剂量±赖性抑制成骨细胞分化,PD98059剂量±赖性增强成骨细胞分化。 SB203580使 p-ERK1/2表达增加,亚砷酸钠减弱其表达。冈田酸使 p-ERK1/2表达增加,并使成骨细胞分化受到抑制。 PP2A可直接与 ERK1/2结合,SB203580使 PP2A与 ERK1/2的结合减弱。结论 p38MAPK可通过 PP2A与 ERK1/2产生协同效应,并调节 BMSCs向成骨细胞分化。     

紫云英苷对膝关节骨性关节炎大鼠JNK/p38MAPK信号通路的影响

目的 探究紫云英苷对膝关节骨性关节炎（KOA）大鼠的保护作用以及对JNK/p38MAPK信号通路的影响。方法 90只SD大鼠随机分为假手术组、模型组、塞来昔布组（18 mg/kg）、紫云英苷低（25 mg/kg）、中（50 mg/kg）、高（100 mg/kg）剂量组,每组15只。改良Huith法建立KOA模型,术后灌胃6周。游标卡尺测量大鼠膝关节直径,足趾容积仪测量大鼠足趾容积;ELISA法检测血清IL-1β、IL-6、TNF-α水平;HE染色观察膝关节软骨组织病理变化;ELISA法检测软骨组织TGF-β1、MMP-3水平;Western Blot法检测p-JNK、JNK、p-p38MAPK、p38MAPK蛋白表达。结果 与假手术组比较,模型组大鼠软骨组织表面被破坏,组织层变薄,细胞数量减少且排列紊乱,潮线被大量破坏;膝关节直径与足趾容积明显变大（P＜0.05）;血清中IL-1β、IL-6、TNF-α水平以及软骨组织中TGF-β1、MMP-3水平,p-JNK/JNK、p-38MAPK/p38MAPK比值显著升高（P＜0.05）。与模型组比较,塞来昔布组与紫云英苷各剂量组软骨组织病变明显减轻;膝关节直径与足趾容积明显缩小（P＜0.05）;血清中IL-1β、IL-6、TNF-α水平以及软骨组织中TGF-β1、MMP-3水平,p-JNK/JNK、p-38MAPK/p38MAPK比值显著降低（P＜0.05）,且紫云英苷各剂量组间具有剂量效应（P＜0.05）;紫云英苷高剂量组与塞来昔布组比较差异无统计学意义（P＞0.05）。结论 紫云英苷可能通过抑制JNK/p38MAPK信号通路激活,减轻炎症反应,改善KOA大鼠膝关节软骨组织损伤。     

In vitro effects of keyhole limpet hemocyanin in breast and pancreatic cancer in regards to cell growth, cytokine production, and apoptosis

BACKGROUND: We have previously shown the inhibitory effects of keyhole limpet hemocyanin (KLH) against breast and pancreatic cancer in vitro. We hypothesize that its actions in breast and pancreas cancer cells are via apoptotic or cytokine pathways. METHODS: Two breast cancer cell lines, ZR75-1 and MCF-7, and one pancreas cancer cell line, PANC-1, were treated with KLH at 500 mug, 250 mug, and 250 ng/mL. Cell viability, cytokine production, and apoptosis were measured. RESULTS: Significant growth inhibition was observed in all cell lines at all KLH concentrations tested. Significant changes in cytokine production were observed in all cell lines. An increase in early and late apoptotic activity was observed in the MCF-7, whereas a reduction in late apoptotic activity was observed in the ZR75-1 cells. CONCLUSIONS: KLH directly inhibits the growth of human breast and pancreas cancer in vitro by apoptotic and nonapoptotic mechanisms.     

Coordinate regulation of secretory stress proteins (PSP/reg,PAP I,PAP II,and PAP III) in the rat exocrine pancreas during experimental acute pancreatitis

BACKGROUND: Pancreatic stone protein (PSP/reg) is a constitutively secreted protein in pancreatic juice. Pancreatitis-associated protein (PAP) belongs to the same family of proteins. PAP is highly increased during acute pancreatitis, while no exact data exist regarding PSP/reg protein synthesis and secretion. Recently, an attempt to determine PSP/reg and PAP levels in sera of rats with acute pancreatitis showed a significant increase in PAP but failed to demonstrate changes in PSP/reg. Others reported that surgical manipulation of the pancreas, including sham controls, affected mRNA levels of PSP/reg. Neither report determined protein levels of PSP/reg. METHODS: Rats were treated intraperitoneally with a supramaximal dose of caerulein to induce pancreatitis, a physiological dose of caerulein, or a saline injection. Pancreata were analyzed for PAP and PSP/reg using ELISAs. RNA was extracted for Northern blot analysis of PAP I, II, and III and PSP/reg mRNA. RESULTS: Experimental induction of acute pancreatitis caused a coordinate increase in both PSP/reg and PAP. PAP showed an acute response and returned to low levels within 48 h while PSP/reg exhibited a more sustained response. Intraperitoneal application of a physiological dose of caerulein and even a saline injection caused an increase in PSP/reg. CONCLUSION: PSP/reg and PAP levels are increased through similar mechanisms by physiological and supramaximal doses of caerulein. However, PSP/reg regulation appears to sustain high levels while PAP levels are more transient. Since the regulation of this protein family is affected even under mild stress, we define them as secretory stress proteins.     

Induction of tumor necrosis-alpha, p38 and JNK in the spinal cord following acute heart injury in the rat model

BACKGROUND: It is still not known whether the spinal cytokine signaling pathways are involved in the pathophysiologic mechanism of the acute phase of heart disease. This study examines the expression pattern of tumor necrosis factor-alpha (TNF-alpha) and its two related mitogenic-activated protein kinases, p38 and Jun-N-terminal kinase (JNK), in the spinal cord in response to acute cardiac injury (ACI). METHODS: The ACI rat model was established by intra-myocardial injection of formalin. At the indicated times after the establishment of ACI, the thoracic segments of the spinal cord were harvested and Western blot was performed to determine the expression of TNF-alpha, p38 and JNK. The localization of the cytokine and the kinases was determined by immunohistochemistry and double immunofluorescence. RESULTS: In response to ACI, TNF-alpha protein was up-regulated and reached a peak level at 6 h after ACI. The up-regulated TNF-alpha was distributed in all the laminae in the spinal cord and mainly localized in the neurons, as determined by immunohistochemistry and double immunofluorescence. In response to ACI, p38 and JNK were also up-regulated in the spinal cord. The expression profiles of p38 and JNK were similar to that of activated TNF-alpha following ACI. CONCLUSIONS: This study shows that cardiac injury can induce the activation of spinal TNF-alpha, p38 and JNK. The activated spinal cytokine signaling may contribute to disease progression in the acute phase of cardiac injury in clinical practice.     

前列腺素E1对大鼠急性胰腺炎细胞因子调控的影响

目的观察前列腺素E1(PGEI)脂微球(Lipo—PGEI)对大鼠急性胰腺炎(SAP)模型全身炎症反应(SIRS)期细胞因子调控的影响并探讨其作用机制。方法应用5％牛磺胆酸钠制作大鼠SAP模型，分为非治疗组和治疗组，各组内再分为3和6h组，采用逆转录-聚合酶链式反应(RT—PCR)方法测定胰腺组织内肿瘤坏死因子(TNF)-α、白细胞介素(IL)-6、IL-10、IL-2的表达。结果非治疗组内3组和6h组比较，TNF-α、IL-6表达逐渐增强；IL-10，IL-2在3h有弱表达，6h表达显著增强；治疗组3、6h的TNF-α、IL-6表达同非治疗组相比明显减弱；IL-10、IL-2表达在3h无显著变化，6h明显减弱。结论在大鼠SAP模型中，Lipo-PGEl可明显抑制炎性细胞因子TNF-α、IL-6和抗炎性细胞因子IL-10、IL-2的表达，使两者重新趋于平衡，对SIRS期细胞因子调控起到重要作用。     

p38信号通路在脂多糖诱导的大鼠系膜细胞产生白细胞介素1？…

目的 探讨ｐ３８信号通路在肾小球系膜细胞促炎介质白细胞介素１（ＩＬ－１）β表达中的作用。方法 采用免疫沉淀法,免疫复合物蛋白激酶测定,Ｗｅｓｔｅｒｎ ｂｌｏｔｔｉｎｇ检测ｐ３８信号通路在脂多糖（ＬＰＳ）诱导的肾小球系膜细胞炎症反应中的活化程度,应用逆转录－聚合酶链反应（ＲＴ－ＰＣＲ）和ＥＬＩＳＡ糖（ＬＰＳ）诱导的肾小系膜细胞炎症反应中的活化程度,应用逆转录－聚合酶链反应（ＲＴ－ＰＣＲ）和ＥＬＩＳＡ     

Activation of ERK and p38 kinase mediated keloid fibroblast apoptosis after flashlamp pulsed-dye laser treatment

BACKGROUND AND OBJECTIVES: Flashlamp pulsed-dye lasers (PDLs) revealed effective regression or arrest in patients with keloids in our clinical studies [Kuo YR et al., Laser Surg Med 2004;34:104-108]. In this study, we further investigated whether the induction of keloid regression seen with PDL treatment through activation in mitogen-activated protein (MAP) kinase and caspase promotes cell apoptosis and reduces fibroblast proliferation. STUDY DESIGN/MATERIALS AND METHODS: Keloid tissues were obtained from 10 patients with intralesional or punch biopsies prior to and 7 days after PDL treatments [fluence per pulse was 10-18 J/cm2 (mean 14 J/cm2)]. Prior to and after PDL treatments, the proliferating fibroblasts in keloid tissue were immunohistochemically detected by proliferating cell nuclear antigen (PCNA) expression. The apoptotic cell was detected by terminal deoxynucleotidyl transferase dUTP-nick end labeling (TUNEL) staining and fragmented caspase-3 expression. MAP kinase activation as represented by extracellular signal-regulated kinase (ERK), p38 kinase (p38), and c-Jun N-terminal kinase (JNK) expression of keloid tissues was investigated by immunohistochemical (IHC) staining, respectively. RESULTS: IHC staining indicated that PCNA expression of fibroblasts was significantly reduced in keloid tissue after PDL irradiation. TUNEL assay revealed lower apoptotic cells expression in the keloid tissue prior to laser treatment. Following laser treatment, apoptotic cells with relatively strong DNA damage and fragmentation were seen in all keloid biopsy samples, especially in the keloid fibroblast population. The activation of ERK and p38 MAP kinase increased significantly in keloid tissue after PDL treatment. JNK was shown to be unchanged. CONCLUSIONS: The PDL treatment is shown to induce keloid regression through suppression of keloid fibroblast proliferation, induction of apoptosis, and upregulation of ERK and p38 MAP kinase activity.     

Differential expression and/or activation of P38MAPK,erk1/2, and jnk during the initiation and progression of prostate cancer

BACKGROUND: Members of the mitogen-activated protein kinase (MAPK) family are capable of transducing signals from a wide variety of stimuli, including growth factors, G-protein coupled receptors, and cytokines that are likely to play a role in the initiation and/or progression of prostate cancer. METHODS: The expression and activation of three members of the MAPK family, namely, erk, jnk, and p38MAPK was examined using Western blotting and immunohistochemistry during tumor progression in a transgenic mouse model for prostate cancer. RESULTS: Activation of p38MAPK was significantly elevated (2.3-fold) in well-differentiated prostatic tumors compared to normal controls. Furthermore, prostatic intraepithelial neoplastic (PIN) lesions expressing activated p38MAPK were observed to be proliferative rather than apoptotic. Expression of activated erk1/2 also preferentially co-located to a sub-population of epithelial cells within PIN lesions that correlated with Ki67 expression. In dramatic contrast, activated forms of erk1/2, jnk, and p38MAPK were reduced or absent in late stage adenocarcinomas and metastatic deposits. CONCLUSIONS: Erk1/2, jnk, and p38MAPKs are differentially expressed and/or activated during prostate cancer progression. Activation of both erk1/2 and p38MAPK occurs concomitant with prostatic epithelial cell proliferation and the initiation of prostate cancer while inactivation is contemporaneous with the emergence of the poorly differentiated metastatic and androgen-independent phenotype.     

p38丝裂原活化蛋白激酶信号转导通路在严重烧伤大鼠急性肺损伤中的作用

目的　研究 p38丝裂原活化蛋白激酶 (MAPK)信号转导通路在严重烧伤大鼠急性肺损伤中的作用。方法　健康成年的雄性SD大鼠 4 8只 ,随机分为假烫伤组、烧伤对照组和烧伤加 p38MAPK信号转导通路抑制剂 (SB2 0 35 80 )组。采用大鼠 30 %总体表面积Ⅲ度烧伤动物模型 ,观察烧伤 2 4h后肺血管通透性、肺脏含水量、肺脏病理和肺脏 p38活性等指标的改变。 结果　大鼠烧伤后2 4h肺血管通透性明显增高 (4 2 5± 4 7vs .12 1± 1 4 ,P <0 0 1) ,肺脏含水量上升 (P <0 0 5 ) ,组织病理学检查显示 :肺脏出现明显的病理损害 ,同时肺脏 p38MAPK活性明显增强。使用SB2 0 35 80能抑制肺脏 p38MAPK活性的上升 ,同时大鼠肺血管通透性明显降低 (2 4 7± 2 9vs.4 2 5± 4 7,P <0 0 1) ,肺脏含水量下降 ,肺脏的病理损害显著减轻。结论　p38MAPK的活化是严重烧伤大鼠急性肺损伤重要的发病机制之一。     

Potential role of p38-mitogene-activated protein kinase and nuclear factor-kappa B expression in testicular dysfunction associated with varicocele: an experimental study

The aim of this study was to investigate p38-mitogene-activated protein kinase (p38-MAPK), nuclear factor-kappa B (p65-NF-kB) and inducible nitric oxide synthase (iNOS) expression in an experimental model of varicocele in the rat testis. Male Wistar albino rats (n = 18) were divided into three equal groups: control group, sham operated group and left varicocele-induced group. Malondialdehyde (MDA), nitric oxide (NO) and reduced glutathione (GSH) levels were biochemically assessed, and the p38-MAPK and NF-kB activity, and iNOS expression were immunohistochemically studied in the right and left testicles of rats from each group. The GSH levels were significantly decreased, whereas the level of MDA and NO was significantly increased in the testicular tissues of rats in varicocele group compared with those of the control and sham groups. There was a marked staining for iNOS, p38-MAPK and p65-NF-kB expression in rats of varicocele group compared with the sham group. There was no positive staining in rats of control group. There were significant differences in biochemical, histological and immunohistochemical studies, but no significant differences were noted between other groups. p38-MAPK and p65-NF-kB activation, and iNOS expression have a significant role in varicocele-induced testicular dysfunction.     

p38 MAPK抑制剂对急性胰腺炎肺损伤肺内细胞间黏附分子-1表达和肺微血管通透性的影响

目的 观察p38蛋白激酶(p38 MAPK)抑制剂对大鼠急性胰腺炎肺损伤(LI)肺内细胞间黏附分子(ICAM)-1表达和肺微血管通透性的影响.方法 SD大鼠36只,假手术组12只;5%的牛黄胆酸(0.1 ml/100 g)逆行注射到SD大鼠的胰胆管内,造成重症急性胰腺炎(SAP);分为SAP组12只和p38 MAPK抑制剂组(SB203580,0.5 mg/kg,静脉注射)12只.各组在3、6、12 h分别剖杀大鼠,检测肺组织的含水量、肺组织髓过氧化物酶(MPO);免疫组织化学检测肺组织p38 MAPK的表达;逆转录-聚合酶链反应(RT-PCR)检测肺组织ICAM-1 mRNA表达水平;检测肺微血管通透性Balf/Serum FITC比率;光镜F检测肺组织组织损害.结果 假手术组肺组织含水量、MPO、肺组织病理评分、ICAM-1 mRNA分别为3.41±0.05、1.48±0.10、0和0.48±0.03;SAP组在3、6、12 h肺组织含水量分别为为3.77±0.12、3.87±0.11和4.03±0.05,SB治疗组分别为3.53±0.07、3.57±0.05和3.69±0.09,SAP组MPO分别为2.17±0.42、4.65±0.26和7.70±0.01,SB治疗组分别为1.72±0.14、2.46±0.29和5.63±0.15;SAP组肺组织病理评分分别为3.16±0.03、5.33±0.05和7.18±0.02,SB治疗组分别为3.12±0.02、5.26±0.03和7.13±0.02;;SAP组ICAM-1 mRNA在6、12 h表达为1.45±0.04和1.65±0.06,SB治疗组分别为1.19±0.06和0.96±0.05.SAP组和SB治疗组上述指标较假手术组升高(P<0.05),但SB治疗组较SAP组下降(P<0.05);而且肺组织p38 MAPK表达和ICAM-1 mRNA表达一致,在12 h达高峰.结论 急性胰腺炎肺损伤可能与肺组织中p38 MAPK和ICAM-1 mRNA过度表达有关;p38 MAPK抑制剂可抑制肺内ICAM-1表达,降低肺微血管通透性,减轻急性胰腺炎肺损伤.