Exploring the mechanism of electroacupuncture at different acupoints on acute colitis rats based on JAK2/STAT3/SOCS1 signaling pathway

Objective:To investigate the mechanism of JAK2/STAT3/SOCS1 signaling pathway in electroacupuncture of different acupoints on acute colitis rats.Methods:36 SPF SD rats were randomly divided into 6 groups,with 6 rats in each group.The rat model of acute colitis was prepared by enema with glacial acetic acid solution.After the model was established,electroacupuncture was given to each acupoint group,with density wave,frequency 2Hz-50 Hz,intensity 2 mA,muscle tremor as the degree 20 min/time,1 time/day,for 3 consecutive days.Observe the general condition of rats;the pathological changes of colonic mucosa in rats were observed by HE method.The contents of serum interleukin-4(IL-4)and interleukin-8(IL-8)were detected by ELISA.Western blot and RT-PCR were used to detect the expression of JAK2,STAT3,SOCS1 protein and mRNA in rat colon tissue.Results:In contrast to the normal group,the overall condition of the model group was worse,the colonic mucosa was severely damaged,even necrotic,and the ulcer surface was obvious.The content of IL-4 in serum was obviously reduced,and the content of IL-8 was obviously go up(P<0.01).The protein content of JAK2,STAT3 and the expression of JAK2,STAT3 mRNA in colon tissue of rats were obviously go up,while the protein content of SOCS1 and the expression of SOCS1 mRNA were obviously reduced(P<0.01).In contrast to the model group,the general condition of rats in each acupoint group was significantly improved,the damage and necrosis of colonic mucosa and ulcer surface were obviously alleviated,the content of IL-4 in serum was obviously go up,and the content of IL-8 was significantly decreased(P<0.01).The protein content of JAK2,STAT3 and the expression of JAK2,STAT3 mRNA in colon tissue of rats were obviously reduced,while the protein content of SOCS1 and the expression of SOCS1 mRNA were obviously go up(P<0.05,P<0.01).Comparison of different acupoint groups,the colonic mucosal injury in the Zusanli group was significantly reduced,the content of serum IL-4 was significantly increased,and the content of IL-8 was significantly decreased(P<0.05,P<0.01).The protein content and mRNA expression of JAK2 and STAT3 in colon tissue were significantly down-regulated,while the protein content and mRNA expression of SOCS1 were significantly go up(P<0.05,P<0.01).Conclusion:Electroacupuncture at each acupoint can improve the damage of colonic mucosa and reduce the inflammatory response.The therapeutic effect of Zusanli(ST36)is better than that of Tianshu(ST25),Dachangshu(BL25)and Shangjuxu(ST37).The mechanism may be related to the regulation of JAK2/STAT3/SOCS1 signaling pathway related proteins and inflammatory cytokines IL-4 and IL-8.

Argatroban promotes recovery of spinal cord injury by inhibiting the PAR1/JAK2/STAT3 signaling pathway

Argatroban is a synthetic thrombin inhibitor approved by U.S.Food and Drug Administration for the treatment of thrombosis.However,whether it plays a role in the repair of spinal cord injury is unknown.In this study,we established a rat model of T10 moderate spinal cord injury using an NYU Impactor ModerⅢand performed intraperitoneal injection of argatroban for 3 consecutive days.Our results showed that argatroban effectively promoted neurological function recovery after spinal cord injury and decreased thrombin expression and activity in the local injured spinal cord.RNA sequencing transcriptomic analysis revealed that the differentially expressed genes in the argatroban-treated group were enriched in the JAK2/STAT3 pathway,which is involved in astrogliosis and glial scar formation.Western blotting and immunofluorescence results showed that argatroban downregulated the expression of the thrombin receptor PAR1 in the injured spinal cord and the JAK2/STAT3 signal pathway.Argatroban also inhibited the activation and proliferation of astrocytes and reduced glial scar formation in the spinal cord.Taken together,these findings suggest that argatroban may inhibit astrogliosis by inhibiting the thrombin-mediated PAR1/JAK2/STAT3 signal pathway,thereby promoting the recovery of neurological function after spinal cord injury.

基于JAK2/STAT3/SOCS1信号通路探讨电针不同腧穴对急性结肠炎大鼠的作用机制

目的:探讨JAK2/STAT3/SOCS1信号通路在电针不同腧穴对大鼠急性结肠炎的作用机制。方法:将36只SPF级SD大鼠随机分为6组,每组6只。除正常组外,其余各组用冰乙酸溶液灌肠制备急性结肠炎大鼠模型,在造模结束后给予各腧穴组电针治疗,疏密波,频率2~50 Hz,强度2 mA,以肌肉震颤为度,20 min/次,1次/d,连续3 d。观察大鼠一般情况;HE法观察大鼠结肠组织黏膜病理学变化;ELISA法检测血清白介素-4(IL-4)、白介素-8(IL-8)的含量;Western blot和RT-PCR法检测大鼠结肠组织JAK2、STAT3、SOCS1蛋白及mRNA的表达。结果:与正常组相比,模型组大鼠整体状况差,结肠黏膜严重受损、甚则坏死,溃疡面明显,血清IL-4的含量明显降低、IL-8的含量明显升高(P<0.01),结肠组织中JAK2、STAT3蛋白及mRNA表达均明显升高、SOCS1蛋白及mRNA表达均明显降低(P<0.01);与模型组比较,各腧穴组大鼠一般情况明显好转,结肠黏膜损伤坏死、溃疡面明显减轻,血清IL-4的含量明显升高、IL-8的含量明显降低(P<0.01);结肠组织中JAK2、STAT3蛋白及mRNA表达明显下降、SOCS1蛋白及mRNA表达则明显升高(P<0.05);足三里组与天枢、大肠俞、上巨虚穴比较,结肠黏膜损伤显著减轻,血清IL-4的含量显著升高、IL-8的含量显著降低(P<0.05);结肠组织中JAK2、STAT3蛋白及mRNA表达显著下降、SOCS1蛋白及mRNA表达则显著升高(P<0.05)。结论:电针各腧穴均能改善结肠组织黏膜的损伤,减轻炎症反应。其中足三里穴治疗效应总体优于天枢、大肠俞、上巨虚穴,其作用机制可能通过调JAK2/STAT3/SOCS1信号通路相关蛋白及炎性细胞因子IL-4、IL-8有关。

Yangyin Huowei mixture alleviates chronic atrophic gastritis by inhibiting the IL-10/JAK1/STAT3 pathway

BACKGROUND The Chinese medicine Yangyin Huowei mixture(YYHWM)exhibits good clinical efficacy in the treatment of chronic atrophic gastritis(CAG),but the mechanisms underlying its activity remain unclear.AIM To investigate the therapeutic effects of YYHWM and its underlying mechanisms in a CAG rat model.METHODS Sprague-Dawley rats were allocated into control,model,vitacoenzyme,and low,medium,and high-dose YYHWM groups.CAG was induced in rats using Nmethyl-N′-nitro-N-nitrosoguanidine,ranitidine hydrochloride,hunger and satiety perturbation,and ethanol gavage.Following an 8-wk intervention period,stomach samples were taken,stained,and examined for histopathological changes.ELISA was utilized to quantify serum levels of PG-I,PG-II,G-17,IL-1β,IL-6,and TNF-α.Western blot analysis was performed to evaluate protein expression of IL-10,JAK1,and STAT3.RESULTS The model group showed gastric mucosal layer disruption and inflammatory cell infiltration.Compared with the blank control group,serum levels of PGI,PGII,and G-17 in the model group were significantly reduced(82.41±3.53 vs 38.52±1.71,23.06±0.96 vs 11.06±0.70,and 493.09±12.17 vs 225.52±17.44,P<0.01 for all),whereas those of IL-1β,IL-6,and TNF-αwere significantly increased(30.15±3.07 vs 80.98±4.47,69.05±12.72 vs 110.85±6.68,and 209.24±11.62 vs 313.37±36.77,P<0.01 for all),and the protein levels of IL-10,JAK1,and STAT3 were higher in gastric mucosal tissues(0.47±0.10 vs 1.11±0.09,0.49±0.05 vs 0.99±0.07,and 0.24±0.05 vs 1.04±0.14,P<0.01 for all).Compared with the model group,high-dose YYHWM treatment significantly improved the gastric mucosal tissue damage,increased the levels of PGI,PGII,and G-17(38.52±1.71 vs 50.41±3.53,11.06±0.70 vs 15.33±1.24,and 225.52±17.44 vs 329.22±29.11,P<0.01 for all),decreased the levels of IL-1β,IL-6,and TNF-α(80.98±4.47 vs 61.56±4.02,110.85±6.68 vs 89.20±8.48,and 313.37±36.77 vs 267.30±9.31,P<0.01 for all),and evidently decreased the protein levels of IL-10 and STAT3 in gastric mucosal tissues(1.11±0.09 vs 0.19±0.07 and 1.04±0.14 vs 0.55±0.09,P<0.01 for both).CONCLUSION YYHWM reduces the release of inflammatory factors by inhibiting the IL-10/JAK1/STAT3 pathway,alleviating gastric mucosal damage,and enhancing gastric secretory function,thereby ameliorating CAG development and cancer transformation.

丹参素通过STAT3/JAK2/SOCS1信号通路在妊娠期糖尿病干预中的作用机制研究

目的:探究不同剂量丹参素对妊娠期糖尿病模型大鼠肾脏的影响及对STAT3/JAK2/SOCS1信号通路分子的干预作用。方法:对SPF级怀孕SD大鼠进行链脲佐菌素(STZ)注射构建妊娠期糖尿病模型,将大鼠随机分为对照组(n=10)、模型组(n=10)、厄贝沙坦组(n=10),丹参素低剂量组(n=10)、丹参素中剂量组(n=10)和丹参素高剂量组(n=10),造模成功后各治疗组分别给予厄贝沙坦[10 mg/(kg·d)]及低[10 mg/(kg·d)、中[15 mg/(kg·d)]、高[20 mg/(kg·d)]剂量的丹参素灌胃7 d。HE染色观察肾脏组织病理变化;大生化检测血清肌酐(Scr)、血尿素氮(BUN)、尿蛋白,血糖仪检测空腹血糖,通过qPCR和Western blot检测肾脏组织中信号传感器和转录激活剂3 (STAT3)、酪氨酸蛋白激酶2 (JAK2)、抑制细胞因子信号1 (SOCS1)的mRNA和蛋白表达水平。结果:丹参素能显著降低妊娠期糖尿病大鼠肾脏损伤;降低外周血Scr、BUN、尿蛋白和空腹血糖水平,并且显著抑制STAT3、JAK2和SOCS1的mRNA和蛋白表达水平(均P<0.01)。结论:丹参素可以降低妊娠期糖尿病大鼠肾脏损伤,其机制可能与抑制STAT3/JAK2/SOCS1信号通路有关。

基于IL-6介导的JAK1/STAT3信号通路探讨竹叶石膏汤合清气化痰丸对COPD大鼠的改善作用

目的探讨竹叶石膏汤合清气化痰丸对慢性阻塞性肺疾病(COPD)大鼠IL-6介导JAK1/STAT3信号通路的调控作用。方法将48只大鼠随机分为正常组,模型组,中药低、中、高剂量组(5、10、15 g/kg竹叶石膏汤合清气化痰丸)及中药低、中、高剂量(5、10、15 g/kg竹叶石膏汤合清气化痰丸)+伊他替尼(30 mg/kg)组,每组8只。采用气道滴注脂多糖(LPS)联合烟熏方法建立COPD模型,造模28 d后给药干预。给药2周后,采用肺功能检测仪测定肺功能指标[吸气峰流速(PIF)、呼气峰流速(PEF)、分钟通气量(MV)],HE染色观察肺组织病理变化,RT-qPCR、免疫印迹分析和免疫组化法检测肺组织IL-6、JAK1、STAT3、SOCS3 mRNA和蛋白表达。结果与模型组比较,中药各剂量组PIF、PEF、MV增加(P<0.05),肺组织炎症细胞浸润和充血水肿减轻,肺大泡减少,肺泡腔的破坏、扩张和融合得到缓解,IL-6、JAK1、STAT3 mRNA和蛋白表达降低(P<0.05),SOCS3 mRNA和蛋白表达升高(P<0.05);给予伊他替尼干预后,中药各剂量组的作用均被逆转(P<0.05)。结论竹叶石膏汤合清气化痰丸可下调IL-6介导的JAK/STAT信号通路过度表达和持续活化,并抑制IL-6表达,减轻气道炎症,抑制COPD症状。

LAIR-1通过阻断JAK2 V617F突变的人HEL细胞JAK/STAT和PI3K/AKT/mTOR信号通路抑制其增殖并促进其凋亡

目的研究人白细胞相关免疫球蛋白样受体1(LAIR-1)对Janus激酶2(JAK2)V617F突变的人急性髓系白血病HEL细胞JAK/信号转导子与转录激活子(STAT)和磷脂酰肌醇3激酶/蛋白激酶B/哺乳动物雷帕霉素靶蛋白(PI3K/AKT/mTOR)信号通路的调节作用,以及对细胞增殖和凋亡的影响。方法采用反转录PCR和基因测序鉴定JAK2 V617F突变;应用免疫共沉淀和Western blot法鉴定LAIR-1募集的蛋白酪氨酸磷酸酶(PTP)种类;采用CCK-8法检测HEL细胞的增殖;采用异硫氰酸荧光素标记的膜联素Ⅴ/碘化丙啶(annexinⅤ-FITC/PI)双标记结合流式细胞术检测HEL细胞的凋亡率;采用Western blot法检测JAK/STAT和PI3K/AKT/mTOR通路蛋白酪氨酸磷酸化水平及细胞周期蛋白D1(cyclin D1)、Bcl2相关X蛋白(BAX)和B细胞淋巴瘤因子2(Bcl2)的蛋白表达。结果在JAK2 V617F突变的HEL细胞中,LAIR-1与其配体胶原蛋白结合后可募集含Src同源域2磷酸酶2(SHP-2);LAIR-1可以下调HEL细胞JAK2、STAT1、STAT3、STAT5、AKT和mTOR的蛋白酪氨酸磷酸化水平,并能够显著抑制cyclin D1和Bcl2的表达,而对BAX的表达水平未见显著影响;LAIR-1能够明显抑制HEL细胞的增殖,促进HEL细胞凋亡。结论在JAK2 V617F突变的人白血病HEL细胞中,LAIR-1可通过募集SHP-2抑制JAK/STAT和PI3K/AKT/mTOR信号通路的活化,进而抑制HEL细胞的增殖,促进细胞凋亡。

3-epi-bufotalin suppresses the proliferation in colorectal cancer cells through the inhibition of the JAK1/STAT3 signaling pathway

Traditional Chinese medicine(TCM)has been increasingly employed in the last decades in China for both preventing and treating a variety of cancers.3-epi-bufotalin is an active ingredient of TCM“Chanpi”with anti-tumor potential.However,the effect and mechanism of 3-epi-bufotalin on colorectal cancers were not well disclosed.The present study demonstrated that 3-epi-bufotalin could reduce viability,trigger apoptosis,and block the cell cycle at the G2/M stage in colorectal cancer cell lines HT29,RKO,and COLO205 in vitro.Moreover,3-epi-bufotalin inhibited the JAK1/STAT3 signaling pathway.These results indicated the anti-proliferation ability of 3-epi-bufotalin in colorectal cancer cells.

SOCS1/JAK2/STAT3 axis regulates early brain injury induced by subarachnoid hemorrhage via inflammatory responses

The SOCS1/JAK2/STAT3 axis is strongly associated with tumor growth and progression,and participates in cytokine secretion in many diseases.However,the effects of the SOCS1/JAK2/STAT3 axis in experimental subarachnoid hemorrhage remain to be studied.A subarachnoid hemorrhage model was established in rats by infusing autologous blood into the optic chiasm pool.Some rats were first treated with JAK2/STAT3 small interfering RNA(Si-JAK2/Si-STAT3)or overexpression plasmids of JAK2/STAT3.In the brains of subarachnoid hemorrhage model rats,the expression levels of both JAK2 and STAT3 were upregulated and the expression of SOCS1 was downregulated,reaching a peak at 48 hours after injury.Simultaneously,the interactions between JAK2 and SOCS1 were reduced.In contrast,the interactions between JAK2 and STAT3 were markedly enhanced.Si-JAK2 and Si-STAT3 treatment alleviated cortical neuronal cell apoptosis and necrosis,destruction of the blood-brain barrier,brain edema,and cognitive functional impairment after subarachnoid hemorrhage.This was accompanied by decreased phosphorylation of JAK2 and STAT3 protein,decreased total levels of JAK2 and STAT3 protein,and increased SOCS1 protein expression.However,overexpression of JAK2 and STAT3 exerted opposite effects,aggravating subarachnoid hemorrhage-induced early brain injury.Si-JAK2 and Si-STAT3 inhibited M1-type microglial conversion and the release of pro-inflammatory factors(inducible nitric oxide synthase,interleukin-1β,and tumor necrosis factor-α)and increased the release of anti-inflammatory factors(arginase-1,interleukin-10,and interleukin-4).Furthermore,primary neurons stimulated with oxyhemoglobin were used to simulate subarachnoid hemorrhage in vitro,and the JAK2 inhibitor AG490 was used as an intervention.The in vitro results also suggested that neuronal protection is mediated by the inhibition of JAK2 and STAT3 expression.Together,our findings indicate that the SOCS1/JAK2/STAT3 axis contributes to early brain injury after subarachnoid hemorrhage both in vitro and in vivo by inducing inflammatory responses.This study was approved by the Animal Ethics Committee of Anhui Medical University and the First Affiliated Hospital of University of Science and Technology of China(approval No.LLSC-20180202)on March 1,2018.

Elevated retinol binding protein 4 levels are associated with atherosclerosis in diabetic rats via JAK2/STAT3 signaling pathway

BACKGROUND Atherosclerosis is a major cause of mortality worldwide and is driven by multiple risk factors,including diabetes,which results in an increased atherosclerotic burden,but the precise mechanisms for the occurrence and development of diabetic atheroscerosis have not been fully elucidated.AIM To summarize the potential role of retinol binding protein 4(RBP4) in the pathogenesis of diabetic atheroscerosis,particularly in relation to the RBP4-Janus kinase 2/signal transducer and activator of transcription 3(JAK2/STAT3)signaling pathway.METHODS Male Wistar rats were randomly divided into three groups,including a control group(NC group),diabetic rat group(DM group),and diabetic atherosclerotic rat group(DA group).The contents of total cholesterol(TC), high-density lipoprotein cholesterol(HDL-c), triglycerides(TG), low-density lipoprotein cholesterol(LDLc), fasting insulin(FINS),fasting plasma glucose,and hemoglobin A1 c(HbA1 c)were measured.Moreover,the adipose and serum levels of RBP4,along with the expression levels of JAK2, phosphorylated JAK2(p-JAK2), STAT3,phosphorylated STAT3(p-STAT3), B-cell lymphoma-2(Bcl-2), and Cyclin D1 in aortic tissues were also measured.Besides,homeostasis model assessment of insulin resistance(HOMA-IR) and atherogenic indexes(AI) were calculated.RESULTS Compared with the NC and DM groups,the levels LDL-c,TG,TC,FINS,HOMAIR,RBP4,and AI were upregulated,whereas that of HDL-c was downregulated in the DA group(P <0.05);the mRNA levels of JAK2,STAT3,Cyclin D1,and Bcl-2 in the DA group were significantly increased compared with the NC group and the DM group;P-JAK2,p-JAK2/JAK2 ratio,p-STAT3,p-STAT3/STAT3 ratio,Cyclin D1,and Bcl-2 at protein levels were significantly upregulated in the DA group compared with the NC group and DM group.In addition,as shown by Pearson analysis,serum RBP4 had a positive correlation with TG,TC,LDL-c,FINS,HbA1 C,p-JAK2,p-STAT3,Bcl-2,Cyclin D1,AI,and HOMA-IR but a negative correlation with HDL-c.In addition,multivariable logistic regression analysis showed that serum RBP4,p-JAK2,p-STAT3,and LDL-c were predictors of the presence of diabetic atherosclerosis.CONCLUSION RBP4 could be involved in the initiation or progression of diabetic atherosclerosis by regulating the JAK2/STAT3 signaling pathway.

复方鱼腥草对糖尿病小鼠肾损伤和JAK/STAT-SOCS-1负反馈调节研究

目的研究复方鱼腥草3种提取部位及其完整成分对db/db小鼠肾损害的保护作用,通过研究各提取物对JAK2/STAT3通路及其下游蛋白的影响探讨复方鱼腥草防治糖尿病肾病的可能机制。方法 1、提取复方鱼腥草水提物、醇提物、挥发油成分,并将3种成分按照所得质量比配制得到复方鱼腥草完整成分。2、选取8只db/m小鼠为正常组;将56只db/db小鼠分为模型组、盐酸二甲双胍组、AG490组、复方鱼腥草水提物组、复方鱼腥草醇提物组、复方鱼腥草挥发油组以及复方鱼腥草完整成分组,每组8只,给药8周,酶联免疫试剂盒法检测血浆转化生长因子-β1(TGF-β1)、纤连蛋白(FN)、胰高血糖素样肽-1(GLP-1)、抑胃肽(GIP)水平,HE染色观察小鼠肾脏病理变化。3、以RT-PCR法检测各组小鼠肾组织中的JAK2 mRNA、STAT3mRNA、SOCS-1 mRNA表达的变化情况;以Western Blot法检测肾组织中的JAK2、p-JAK2、STAT3、pSTAT3、SOCS-1、c-fos及c-jun蛋白表达变化,运用免疫荧光法检测肾组织c-fos、c-jun蛋白的表达。结果给药8周后,与正常组比较,模型组血浆中TGF-β1、FN、GIP水平升高(P <0.05),GLP-1水平下降(P <0.05);与模型组比较,治疗组小鼠血浆中TGF-β1、FN、GIP、GLP-1水平及肾组织病理改变均有所改善。模型组小鼠肾组织p-JAK2、p-STAT3蛋白表达及JAK2、STAT3 mRNA表达均比正常组增高(P <0.05);与模型组相比,各给药组小鼠肾组织p-JAK2,p-STAT3蛋白表达均有降低,醇提物组、挥发油组及完整成分组小鼠肾组织SOCS-1蛋白显著升高(P <0.05);各给药组的JAK2、STAT3基因表达变化不显著(P> 0.05)。AG490组及完整成分组的c-fos、c-jun在肾小管及肾间质的表达均有不同程度下降(P <0.05)。结论复方鱼腥草对糖尿病肾损伤具有改善作用,其保护肾脏的作用可能与调节GLP-1、GIP水平,降低FN、TGF-β1的分泌,减少ECM聚积,维持肾脏结构、功能的完整性有关。其改善糖尿病肾损伤的分子机制可能通过SOCS负反馈调节JAK/STAT信号转导通路相关基因及蛋白表达,从而抑制降低下游原癌基因c-fos、c-jun的表达,减少炎症因子的活化有关。

HBP1 inhibits chicken preadipocyte differentiation by activating the STAT3 signaling via directly enhancing JAK2 expression

Obesity presents a serious threat to human health and broiler performance.The expansion of adipose tissue is mainly regulated by the differentiation of preadipocytes.The differentiation of preadipocytes is a complex biological process regulated by a variety of transcription factors and signaling pathways.Previous studies have shown that the transcription factor HMG-box protein 1(HBP1)can regulate the differentiation of mouse 3T3-L1 preadipocytes by activating the Wnt/β-catenin signaling pathway.However,it is unclear whether HBP1 involved in chicken preadipocyte differentiation and which signaling pathways it regulates.The aim of the current study was to explore the biological function and molecular regulatory mechanism of HBP1 in the differentiation of chicken preadipocytes.The expression patterns of chicken HBP1 in abdominal adipose tissue and during preadipocyte differentiation were analyzed by RT-qPCR and Western blot.The preadipocyte stably overexpressing HBP1 or knockout HBP1 and their control cell line were used to analyze the effect of HBP1 on preadipocyte differentiation by oil red O staining,RT-qPCR and Western blot.Cignal 45-Pathway Reporter Array was used to screen the signal pathways that HBP1 regulates in the differentiation of chicken preadipocytes.Chemical inhibitor and siRNA for signal transducer and activator of transcription 3(STAT3)were used to analyze the effect of STAT3 on preadipocyte differentiation.The preadipocyte stably overexpressing HBP1 was transfected by the siRNA of STAT3 or treated with a chemical inhibitor of STAT3 for the rescue experiment.The results of gene expression analysis showed that the expression of HBP1 was related to abdominal fat deposition and preadipocyte differentiation in chickens.The results of function gain and loss experiments indicated that overexpression/knockout of HBP1 in chicken preadipocytes could inhibit/promote(P<0.05)lipid droplet deposition and the expression of adipogenesis-related genes.Mechanismlly,HBP1 activates(P<0.05)the signal transducer and activator of transcription 3(STAT3)signaling pathway by targeting janus kinase 2(JAK2)transcription.The results of functional rescue experiments indicated that STAT3 signaling mediated the regulation of HBP1 on chicken preadipocyte differentiation.In conclusion,HBP1 inhibits chicken preadipocyte differentiation by activating the STAT3 signaling pathway via directly enhancing JAK2 expression.Our findings provided new insights for further analysis of the molecular genetic basis of chicken adipose tissue growth and development.

镰形棘豆总黄酮通过调控JAK1/STAT1/SOCS3信号通路减轻特发性肺纤维化

目的:探讨镰形棘豆总黄酮(FOFB)调控Janus激酶1(JAK1)/信号转导及转录激活蛋白1(STAT1)/细胞因子信号传送阻抑物3(SOCS3)信号通路干预特发性肺纤维化(IPF)体外模型的机制。方法:将50只SPF级大鼠随机分为空白血清组、含低浓度FOFB血清组、含中浓度FOFB血清组、含高浓度FOFB血清组和含吡非尼酮血清组,每组10只,并按照中药血清药理学方法提取含药血清。将人胚肺成纤维细胞系HFL-1分正常组、模型组、空白血清组、含低浓度FOFB血清组、含中浓度FOFB血清组、含高浓度FOFB血清组和含吡非尼酮血清组。采用纤维化诱导剂转化生长因子β1建立IPF体外模型,CCK-8法筛选含药血清最佳干预时间,进行最佳时间干预;RT-qPCR及Western blot检测Ⅰ型胶原(COL I)、Ⅲ型胶原(COL Ⅲ)和α-平滑肌肌动蛋白(α-SMA)的表达,以验证模型建立是否成功;透射电子显微镜观察FOFB对细胞内粗面内质网的影响;RT-qPCR检测SOCS3、肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)、细胞间黏附分子1(ICAM1)和单核细胞趋化蛋白1(MCP1)的mRNA表达;Western blot检测p-JAK1、p-STAT1、SOCS3、TNF-α、IL-1β、ICAM1和MCP1的蛋白水平。结果:CCK-8法检测含药血清最佳干预时间为120 h。与正常组相比,模型组中COL I、COL Ⅲ和α-SMA的表达显著升高(P<0.01),提示模型建造成功;经过FOFB干预后,COL I、COL Ⅲ和α-SMA的表达显著下降(P<0.01)。透射电子显微镜结果显示,与正常组相比,模型组中粗面内质网数量增加;经过FOFB干预后,粗面内质网数量逐渐降低,且其结构逐渐呈囊泡状。RT-qPCR及Western blot结果显示,与正常组比较,p-JAK1、p-STAT1、TNF-α、IL-1β、ICAM1及MCP1的表达水平显著升高,SOCS3表达水平显著降低(P<0.01);经FOFB干预后,与模型组比较,JAK1/STAT1信号通路被显著抑制,其中p-JAK1、pSTAT1、TNF-α、IL-1β、ICAM1及MCP1的表达水平显著降低,SOCS3的表达水平显著升高(P<0.01)。结论:FOFB在IPF体外模型中可能通过升高SOCS3表达而抑制JAK1/STAT1信号通路,从而延缓IPF的进展。

栀子苷调节JAK2/STAT3/SOCS1信号通路对骨肉瘤细胞恶性进展的影响

该文旨在探究栀子苷(geniposide,GEN)调节酪氨酸蛋白激酶2(JAK2)/信号转导与转录活化因子3(STAT3)/细胞因子信号转导抑制因子1(SOCS1)信号通路对骨肉瘤细胞恶性进展的影响。用浓度为2.5~40 mg/mL的GEN处理人骨肉瘤细胞(U2OS),采用CCK-8法检测细胞活性,筛选出最佳药物浓度;将U2OS细胞分为对照组(Control组),栀子苷低、中、高浓度组(GEN-L组、GEN-M组、GEN-H组),栀子苷高浓度+STAT3激活剂组(GEN-H+colivelin组);细胞增殖情况用平板克隆法检测;细胞凋亡情况用流式细胞仪检测;细胞迁移情况用划痕实验检测;细胞侵袭情况用Transwell实验检测;Western blot检测细胞周期蛋白D1(Cyclin D1)、细胞核增殖抗原标记物(Ki67)、B细胞淋巴瘤-2相关X蛋白(Bax)、半胱氨酸蛋白酶-3(Caspase-3)、基质金属蛋白酶9(MMP-9)、基质金属蛋白酶2(MMP-2)、JAK2、STAT3、SOCS1蛋白表达水平;裸鼠移植瘤实验检测GEN对骨肉瘤移植瘤生长的影响。选择5 mg/mL、10 mg/mL、20 mg/mL的GEN进行后续研究。与Control组比较,GEN-L、GEN-M、GEN-H组集落形成数、细胞划痕愈合率、细胞侵袭数量及Ki67、Cyclin D1、MMP-9、MMP-2、p-JAK2/JAK2、p-STAT3/STAT3表达水平呈浓度依赖性降低,SOCS1蛋白表达水平、细胞凋亡率及Caspase-3、Bax表达水平呈浓度依赖性升高(P<0.05);与GEN-H组相比,GEN-H+colivelin组集落形成数、划痕愈合率、细胞侵袭数量及Ki67、Cyclin D1、MMP-9、MMP-2、p-JAK2/JAK2、p-STAT3/STAT3表达水平显著升高,SOCS1蛋白表达水平、细胞凋亡率及Caspase-3、Bax表达水平显著降低(P<0.05)。移植瘤实验显示,GEN组移植瘤比Control组生长缓慢,移植瘤体积、质量均减小,p-JAK2/JAK2、p-STAT3/STAT3表达水平降低,SOCS1水平升高(P<0.05)。GEN可通过调节JAK2/STAT3/SOCS1信号通路抑制骨肉瘤细胞恶性进展。

SOCS-2和SOCS-3通过IGF-1和GH信号转导系统作用于成肌细胞的分化(英文)

新近发现的细胞因子信号转导抑制因子(SOCS)家族,因其能够通过Janus激酶—信号传导和转录激活子(JAK-STAT)信号传导通路来反馈调节生长因子的信号或者抑制细胞因子的信号转导而倍受研究人员重视。一些研究表明,SOCS-3在促进成肌细胞分化和抑制白介素6(IL-6)导致的细胞炎症过程中具有重要的作用。综合大量关于细胞因子信号转导抑制因子家族的文献报道,文章分析了近几年SOCS-2和SOCS-3与IGF-1和GH信号转导关系的研究,特别是关于SOCS-3在成肌细胞分化过程中的研究,认为可以将SOCS-2和SOCS-3作为细胞内生长信号调节和促进动物肌肉发育的潜在因子进行研究。

3C^(pro)of FMDV inhibits type II interferon-stimulated JAK-STAT signaling pathway by blocking STAT1 nuclear translocation

Foot-and-mouth disease virus(FMDV)has developed various strategies to antagonize the host innate immunity.FMDV Lpro and 3Cpro interfere with type I IFNs through different mechanisms.The structural protein VP3 of FMDV degrades Janus kinase 1 to suppress IFN-γsignaling transduction.Whether non-structural proteins of FMDV are involved in restraining type II IFN signaling pathways is unknown.In this study,it was shown that FMDV replication was resistant to IFN-γtreatment after the infection was established and FMDV inhibited type II IFN induced expression of IFN-γ-stimulated genes(ISGs).We also showed for the first time that FMDV non-structural protein 3C antagonized IFN-γ-stimulated JAK-STAT signaling pathway by blocking STAT1 nuclear translocation.3C^(pro)expression significantly reduced the ISGs transcript levels and palindromic gamma-activated sequences(GAS)promoter activity,without affecting the protein level,tyrosine phosphorylation,and homodimerization of STAT1.Finally,we provided evidence that 3C protease activity played an essential role in degrading KPNA1 and thus inhibited ISGs mRNA and GAS promoter activities.Our results reveal a novel mechanism by which an FMDV non-structural protein antagonizes host type II IFN signaling.

JAK/STAT信号通路与肝细胞性肝癌的肿瘤进展和预后的相关性研究

目的:探讨JAK/STAT信号通路在肝细胞性肝癌组织中的表达及其与预后的关系。方法:选取196例肝细胞性肝癌组织标本,以正常肝脏组织标本20例作为对照,应用SABC免疫组化方法检测JAK-1蛋白和STAT-3蛋白的表达,分析二者与肝细胞性肝癌的病理分级、临床分期及预后的关系。结果:JAK-1蛋白和STAT-3蛋白在肝细胞性肝癌组织中的阳性表达率均高于正常肝脏组织(P=0.02,0.01);肝细胞性肝癌中JAK-1蛋白和STAT-3蛋白的表达与患者性别、年龄、肿瘤大小、有无肝硬化均无显著相关;包膜不完整(P=0.01,0.008)、出现门静脉癌栓(P=0.02)、分化未成熟(P=0.01,0.009)、临床III～IV期(P=0.02,0.008)的肝细胞性肝癌组织中JAK-1蛋白和STAT-3蛋白的表达明显高于有完整包膜、未出现门静脉癌栓、分化较成熟及临床I～II期的组织。Cox比例风险回归模型分析表明JAK-1蛋白和STAT-3蛋白均为影响肝细胞性肝癌预后的危险因素。结论:JAK/STAT信号通路的过度活化在肝细胞性肝癌的发生和发展过程中起重要作用,可以作为评价肝细胞性肝癌恶性程度及预后的重要生物学指标。

益肾化瘀方调控JAK2/STAT3/SOCS1信号通路对AngⅡ诱导HK-2细胞的保护作用

目的:研究益肾化瘀方对血管紧张素Ⅱ(AngⅡ)诱导正常人近端肾小管上皮细胞(HK-2)保护作用的可能机制。方法:HK-2细胞分为正常对照组、AngⅡ组、缬沙坦含药血清组和5%、10%、20%益肾化瘀方含药血清组,分别于培养第12、24、48小时观察细胞形态,MTT法检测细胞增殖情况,免疫荧光法检测纤连蛋白(FN)的表达,PCR法检测基质金属蛋白酶1(MMP-1)、金属蛋白酶组织抑制剂1(TIMP-1)mRNA的表达,Western blot法检测酪氨酸蛋白激酶2(JAK2)、信号转导与转录活化因子3(STAT3)、细胞因子信号传导抑制因子(SOCS1)蛋白的表达。结果:与AngⅡ组同期比较,各给药组可不同程度减轻细胞纤维化,并降低FN表达水平,MMP-1、TIMP-1 mRNA表达量和JAK2、STAT3蛋白的表达(P<0.05),并升高SOCS1蛋白表达(P<0.05),以20%益肾化瘀方含药血清组和缬沙坦含药血清组最为明显。结论:益肾化瘀方可能是通过调控JAK/STAT/SOCS1信号通路,提高抗炎水平,减少细胞外基质(ECM)沉积,对HK-2细胞起到保护作用。

Sphingosine kinase 1 promotes growth of glioblastoma by increasing inflammation mediated by the NF-κB/IL-6/STAT3 and JNK/PTX3 pathways

Glioblastoma(GBM)is the most challenging malignant tumor of the central nervous system because of its high morbidity,mortality,and recurrence rate.Currently,mechanisms of GBM are still unclear and there is no effective drug for GBM in the clinic.Therefore,it is urgent to identify new drug targets and corresponding drugs for GBM.In this study,in silico analyses and experimental data show that sphingosine kinase 1(SPHK1)is up-regulated in GBM patients,and is strongly correlated with poor prognosis and reduced overall survival.Overexpression of SPHK1 promoted the proliferation,invasion,metastasis,and clonogenicity of GBM cells,while silencing SPHK1 had the opposite effect.SPHK1 promoted inflammation through the NF-κB/IL-6/STAT3 signaling pathway and led to the phosphorylation of JNK,activating the JNK-JUN and JNK-ATF3 pathways and promoting inflammation and proliferation of GBM cells by transcriptional activation of PTX3.SPHK1 interacted with PTX3 and formed a positive feedback loop to reciprocally increase expression,promote inflammation and GBM growth.Inhibition of SPHK1 by the inhibitor,PF543,also decreased tumorigenesis in the U87-MG and U251-MG SPHK1 orthotopic mouse models.In summary,we have characterized the role and molecular mechanisms by which SPHK1 promotes GBM,which may provide opportunities for SPHK1-targeted therapy.

Corrigendum

Corrigendum:SOCS1/JAK2/STAT3 axis regulates early brain injury induced by subarachnoid hemorrhage via inflammatory responses https://doi.org/10.4103/NRR.NRR-D-24-00421 The article“SOCS1/JAK2/STAT3 axis regulates early brain injury induced by subarachnoid hemorrhage via inflammatory responses”published on pages 2453-2464,Issue 16,Volume 12 of Neural Regeneration Research(Wang et al.,2021)contained errors in Figures 3 and 6 due to an oversight during the image selection process.