Zhang Hui, Li Yueyue, Li Linqiang, Liu Hua, Hu Liangkai, Dai Ying, Chen Jianqing, Xu Shuqi, Chen Weimin, Xu Xiaorong, Xu Xuanfu
Department of Gastroenterology, the Tenth People's Hospital of Shanghai, Tongji University, Shanghai 200072, China.
Department of Gastroenterology, the Shidong Hospital of Shanghai, Shanghai 200072, China.
Mar Drugs. 2017 Feb 17;15(2):45. doi: 10.3390/md15020045.
Previous studies have focused on the effects of propylene glycol alginate sodium sulfate (PSS) against thrombosis, but the anti-inflammatory potential is unknown. Therefore, we specifically focused on the protective effects of PSS on cerulein-induced acute pancreatitis (AP) using a mouse model, and investigated the mechanism of PSS on autophagy and apoptosis via the Mitogen-activated protein kinase (MEK)/extracellular signal-regulated kinase (ERK) pathway. Cerulein (100 ug/kg) was used to induce AP by ten intraperitoneal injections at hourly intervals in Balb/C mice. Pretreatment with vehicle or PSS was carried out 1 h before the first cerulein injection and two doses (25 mg/kg and 50 mg/kg) of PSS were injected intraperitoneally. The severity of AP was assessed by pathological score, biochemistry, pro-inflammatory cytokine levels, myeloperoxidase (MPO) activity and MEK/ERK activity. Furthermore, pancreatic histological scores, serum amylase and lipase activities, tumor necrosis factor-α (TNF-α), interleukin (IL)-1β interleukin (IL)-6 levels, and MPO activity were significantly reduced by PSS via up-regulated MEK/ERK activity. The representative molecules of apoptosis and autophagy, such as Bcl-2, Bax, Lc-3, Beclin-1, P62, were remarkably reduced. Taken together, these results indicate that PSS attenuates pancreas injury by inhibiting autophagy and apoptosis through a mechanism involving the MEK/ERK signaling pathway.
以往的研究主要聚焦于藻酸丙二醇酯硫酸钠(PSS)抗血栓形成的作用,但其抗炎潜力尚不清楚。因此,我们使用小鼠模型专门研究了PSS对雨蛙肽诱导的急性胰腺炎(AP)的保护作用,并通过丝裂原活化蛋白激酶(MEK)/细胞外信号调节激酶(ERK)通路研究了PSS对自噬和凋亡的作用机制。采用雨蛙肽(100μg/kg)以每小时1次的间隔腹腔注射10次,诱导Balb/C小鼠发生AP。在首次注射雨蛙肽前1小时,用溶媒或PSS进行预处理,并腹腔注射两剂(25mg/kg和50mg/kg)PSS。通过病理评分、生化指标、促炎细胞因子水平、髓过氧化物酶(MPO)活性和MEK/ERK活性评估AP的严重程度。此外,PSS通过上调MEK/ERK活性,显著降低了胰腺组织学评分、血清淀粉酶和脂肪酶活性、肿瘤坏死因子-α(TNF-α)、白细胞介素(IL)-1β、白细胞介素(IL)-6水平以及MPO活性。凋亡和自噬的代表性分子,如Bcl-2、Bax、Lc-3、Beclin-1、P62,均显著降低。综上所述,这些结果表明,PSS通过涉及MEK/ERK信号通路的机制抑制自噬和凋亡,从而减轻胰腺损伤。