Objective Histamine N-methyltransferase(HNMT)is involved primarily in histamine metabolism,but emerging evidence suggests its potential role in cancer progression.This study investigated the role of HNMT in nasopharyn...Objective Histamine N-methyltransferase(HNMT)is involved primarily in histamine metabolism,but emerging evidence suggests its potential role in cancer progression.This study investigated the role of HNMT in nasopharyngeal carcinoma(NPC)and its impact on interferon(IFN)signaling,thioredoxin-interacting protein(TXNIP),and p53 tumor suppressor pathways.Methods HNMT expression in NPC tissues and cell lines was analyzed via qPCR and Western blotting.Functional assays,including cell proliferation,migration,invasion,and apoptosis,were performed after HNMT knockdown or overexpression.Transcriptomic sequencing was used to identify differentially expressed genes(DEGs).In addition,we examined the relationship between HNMT and the IFN/TXNIP/p53 axis via rescue experiments in vitro and in vivo models via qPCR and Western blotting.Results HNMT knockdown reduced cell proliferation,migration,and invasion,and promoted apoptosis in NPC tissues and cell lines.TXNIP was the most significantly upregulated gene following HNMT knockdown.Inhibition of the IFN pathway reversed these effects,confirming the role of HNMT in downregulating the IFN/TXNIP/p53 pathway.An in vivo study revealed that HNMT overexpression correlated with reduced expression of TXNIP and p53 in NCG mice.Conclusion In NPC,HNMT promotes tumor growth and progression by inhibiting the IFN/TXNIP/p53 axis.These findings suggest that targeting the HNMT axis or restoring its function could provide new therapeutic strategies for NPC.展开更多
目的通过观察补阳还五汤对高血压病大鼠硫氧还蛋白互作蛋白-消皮素D(TXNIP/GSDMD)信号转导通路的影响,从焦亡角度探讨补阳还五汤对高血压病大鼠主动脉血管内皮损伤的保护机制。方法将大鼠随机分为空白对照组,模型组,补阳还五汤低、中、...目的通过观察补阳还五汤对高血压病大鼠硫氧还蛋白互作蛋白-消皮素D(TXNIP/GSDMD)信号转导通路的影响,从焦亡角度探讨补阳还五汤对高血压病大鼠主动脉血管内皮损伤的保护机制。方法将大鼠随机分为空白对照组,模型组,补阳还五汤低、中、高剂量组,氢氯噻嗪组,每组10只,所有大鼠于SPF级动物实验中心普通饲料适应性饲养7 d。空白对照组每日给予低盐饲料喂养,其余各组采用高盐饲料喂养,同时,补阳还五汤低、中、高剂量组分别以0.275、0.55、1.1 g/mL浓度中药干预,氢氯噻嗪组以10 mg/(kg·d)浓度药物干预。3周后,观察到大鼠血压比造模前升高大于或等于30 mm Hg(1 mm Hg≈0.133 kPa),且收缩压(SBP)≥160 mm Hg即高血压病大鼠造模成功。取大鼠主动脉进行检测,HE染色观察大鼠主动脉病理形态改变;采用ELISA检测大鼠主动脉中血管紧张素Ⅱ(AngⅡ)、白细胞介素18(IL-18)、白细胞介素1β(IL-1β)、超氧化物歧化酶(superoxide dismutase,SOD)以及丙二醛(malondialdehyde,MDA)蛋白表达;荧光定量PCR检测大鼠主动脉中TXNIP、GSDMD、还原性辅酶Ⅱ氧化酶4(NOX4)、IL-1β的mRNA表达,免疫印迹实验(Western blot)检测大鼠主动脉中GSDMD的蛋白表达,免疫组化(IHC)检测大鼠主动脉中TXNIP、NOD样受体蛋白3(NLRP3)、GSDMD的蛋白表达。结果与空白对照组相比,模型组大鼠血压明显升高,主动脉内外膜都有一定脱落,界线模糊,血管中膜弹性纤维结构比较疏松,排列有一定紊乱;TXNIP、GSDMD、IL-1β、NOX4的mRNA表达上升(P<0.05);TXNIP、NLRP3、GSDMD、IL-1β、IL-18、AngⅡ、MDA的蛋白表达升高(P<0.05),SOD蛋白表达降低(P<0.05)。与模型组相比,补阳还五汤中剂量组和氢氯噻嗪组大鼠血压明显降低,血管内外膜更加完整、光滑,结构更加致密,界线较为清晰明显,补阳还五汤低、高剂量组内外膜仍有一定脱落,弹性纤维排列比较杂乱,变化不明显;药物干预后各组TXNIP、GSDMD、IL-1β、NOX4的mRNA表达均下降(P<0.05);补阳还五汤中剂量组和氢氯噻嗪组TXNIP、NLRP3、GSDMD、IL-1β、IL-18、AngⅡ、MDA的蛋白表达降低(P<0.05),SOD蛋白表达升高(P<0.05)。结论补阳还五汤可通过抑制氧化应激,调节TXNIP/GSDMD信号通路的分子表达,调控血管内皮焦亡,从而发挥保护血管、治疗高血压病的作用。展开更多
基金supported by grants from Science Research Foundation of Yunnan Education Bureau(No.2023Y0631)Yunnan Provincial Science and Technology Project(No.202303AP140005).
文摘Objective Histamine N-methyltransferase(HNMT)is involved primarily in histamine metabolism,but emerging evidence suggests its potential role in cancer progression.This study investigated the role of HNMT in nasopharyngeal carcinoma(NPC)and its impact on interferon(IFN)signaling,thioredoxin-interacting protein(TXNIP),and p53 tumor suppressor pathways.Methods HNMT expression in NPC tissues and cell lines was analyzed via qPCR and Western blotting.Functional assays,including cell proliferation,migration,invasion,and apoptosis,were performed after HNMT knockdown or overexpression.Transcriptomic sequencing was used to identify differentially expressed genes(DEGs).In addition,we examined the relationship between HNMT and the IFN/TXNIP/p53 axis via rescue experiments in vitro and in vivo models via qPCR and Western blotting.Results HNMT knockdown reduced cell proliferation,migration,and invasion,and promoted apoptosis in NPC tissues and cell lines.TXNIP was the most significantly upregulated gene following HNMT knockdown.Inhibition of the IFN pathway reversed these effects,confirming the role of HNMT in downregulating the IFN/TXNIP/p53 pathway.An in vivo study revealed that HNMT overexpression correlated with reduced expression of TXNIP and p53 in NCG mice.Conclusion In NPC,HNMT promotes tumor growth and progression by inhibiting the IFN/TXNIP/p53 axis.These findings suggest that targeting the HNMT axis or restoring its function could provide new therapeutic strategies for NPC.
文摘目的通过观察补阳还五汤对高血压病大鼠硫氧还蛋白互作蛋白-消皮素D(TXNIP/GSDMD)信号转导通路的影响,从焦亡角度探讨补阳还五汤对高血压病大鼠主动脉血管内皮损伤的保护机制。方法将大鼠随机分为空白对照组,模型组,补阳还五汤低、中、高剂量组,氢氯噻嗪组,每组10只,所有大鼠于SPF级动物实验中心普通饲料适应性饲养7 d。空白对照组每日给予低盐饲料喂养,其余各组采用高盐饲料喂养,同时,补阳还五汤低、中、高剂量组分别以0.275、0.55、1.1 g/mL浓度中药干预,氢氯噻嗪组以10 mg/(kg·d)浓度药物干预。3周后,观察到大鼠血压比造模前升高大于或等于30 mm Hg(1 mm Hg≈0.133 kPa),且收缩压(SBP)≥160 mm Hg即高血压病大鼠造模成功。取大鼠主动脉进行检测,HE染色观察大鼠主动脉病理形态改变;采用ELISA检测大鼠主动脉中血管紧张素Ⅱ(AngⅡ)、白细胞介素18(IL-18)、白细胞介素1β(IL-1β)、超氧化物歧化酶(superoxide dismutase,SOD)以及丙二醛(malondialdehyde,MDA)蛋白表达;荧光定量PCR检测大鼠主动脉中TXNIP、GSDMD、还原性辅酶Ⅱ氧化酶4(NOX4)、IL-1β的mRNA表达,免疫印迹实验(Western blot)检测大鼠主动脉中GSDMD的蛋白表达,免疫组化(IHC)检测大鼠主动脉中TXNIP、NOD样受体蛋白3(NLRP3)、GSDMD的蛋白表达。结果与空白对照组相比,模型组大鼠血压明显升高,主动脉内外膜都有一定脱落,界线模糊,血管中膜弹性纤维结构比较疏松,排列有一定紊乱;TXNIP、GSDMD、IL-1β、NOX4的mRNA表达上升(P<0.05);TXNIP、NLRP3、GSDMD、IL-1β、IL-18、AngⅡ、MDA的蛋白表达升高(P<0.05),SOD蛋白表达降低(P<0.05)。与模型组相比,补阳还五汤中剂量组和氢氯噻嗪组大鼠血压明显降低,血管内外膜更加完整、光滑,结构更加致密,界线较为清晰明显,补阳还五汤低、高剂量组内外膜仍有一定脱落,弹性纤维排列比较杂乱,变化不明显;药物干预后各组TXNIP、GSDMD、IL-1β、NOX4的mRNA表达均下降(P<0.05);补阳还五汤中剂量组和氢氯噻嗪组TXNIP、NLRP3、GSDMD、IL-1β、IL-18、AngⅡ、MDA的蛋白表达降低(P<0.05),SOD蛋白表达升高(P<0.05)。结论补阳还五汤可通过抑制氧化应激,调节TXNIP/GSDMD信号通路的分子表达,调控血管内皮焦亡,从而发挥保护血管、治疗高血压病的作用。
