Pasteurellosis is the most prevalent, extremely contagious bacterial disease among domestic rabbits and is considered the leading cause of deaths in rabbits, resulting in enormous economic losses to the rabbit industr...Pasteurellosis is the most prevalent, extremely contagious bacterial disease among domestic rabbits and is considered the leading cause of deaths in rabbits, resulting in enormous economic losses to the rabbit industry. Screening for bacterial agents causing mortalities in rabbits revealed the presence of Enterobacteriacae species in approximately 42% of studied cases, with E. coli the most commonly isolated organism. The present study was designed to evaluate the immune response of rabbits vaccinated with a locally prepared, combined inactivated vaccine of Pasteurella multocida and E. coli, adjuvanated with Montanide ISA70. A total of 370 rabbits, aged 2 - 3 weeks, were divided into four groups: (G1) vaccinated with a polyvalent P. multocida vaccine, (G2) vaccinated with a polyvalent E. coli vaccine, (G3) vaccinated with a combined inactivated Montanide ISA70 vaccine of P. multocida and E. coli, and (G4) kept as a non-vaccinated control group. All rabbits received two doses of 0.5 ml of the prepared vaccines, administered one month apart, and were then challenged with virulent strains of P. multocida and E. coli three weeks after the second vaccination. The prepared vaccines were evaluated by determining humoral immunity using indirect haemagglutination (IHA) test and ELISA. The potency of the vaccines was assessed through challenge and determination of LD50. Experimental findings on the prepared polyvalent combined inactivated P. multocida and E. coli vaccine indicated that it is a potent vaccine, producing the highest antibody titers and a 90% protection rate against challenges with virulent strains of P. multocida type A, D2, and E. coli types O157, O151 and O125. Thus, this vaccine is promising in addressing both P. multocida and E. coli problems in rabbits, farms, providing significant protection, and we recommend its commercial production to help rabbit producers control these two major bacterial infections.展开更多
针对耦合神经P系统利用脉冲机制实现区域生长依赖于初始种子点选择的问题,提出一种自适应区域生长耦合神经P系统(adaptive region growing coupled neural P systems,ARGCNP)的图像分割方法。该方法利用金豺优化算法(golden jackal opti...针对耦合神经P系统利用脉冲机制实现区域生长依赖于初始种子点选择的问题,提出一种自适应区域生长耦合神经P系统(adaptive region growing coupled neural P systems,ARGCNP)的图像分割方法。该方法利用金豺优化算法(golden jackal optimization,GJO)的全局搜索能力,通过引入四种策略提升GJO的全局寻优性能,从而在图像中寻找最佳阈值点,以优化区域生长中的种子点选择。在实验中,首先通过CEC2017测试函数对改进后的GJO进行性能测试,结果表明改进后的GJO在测试函数上整体性能第一;随后将ARGCNP应用于分割彩色图像和医学图像,以峰值信噪比等三个指标对分割效果进行量化评价,分割结果显示该方法能够提升分割精度及分割结果的稳定性,证明ARGCNP在应用场景下具有的优势,能够满足图像分割需求。展开更多
The rapid emergence and spread of colistin-resistant gram-negative bacteria has raised worldwide public health concerns,and phosphoethanolamine(PEtn)transferase modification-mediated colistin resistance has been widel...The rapid emergence and spread of colistin-resistant gram-negative bacteria has raised worldwide public health concerns,and phosphoethanolamine(PEtn)transferase modification-mediated colistin resistance has been widely documented in multiple gram-negative bacterial species.However,whether such a mechanism exists in the zoonotic pathogen Pasteurella multocida is still unknown.Recently,a novel PEtn transferase,PetL,was identified in P.multo-cida,but whether it is associated with colistin resistance remains to be elucidated.In this study,we found that PetL in P.multocida(PetL^(PM))exhibited structural characteristics similar to those of the mobile-colistin-resistant(MCR)protein and the PEtn transferase characterized in Neisseria meningitidis.The transformation of petLPM into E.coli or K.pneumoniae changed the phenotype of several tested strains from colistin sensitive to colistin resistant.Deletion of this gene decreased the colistin minimum inhibitory concentration(MIC)of P.multocida by 64-fold.Our extensive analysis by MALDI-TOF-MS demonstrated that PetLPM participated in the modification of bacterial lipopolysaccharide(LPS)-lipid A.Deletion of petL^(PM) led to an increase in membrane charge but a decrease in cell-surface hydrophobicity and cell permeability in P.multocida.The present study is the first to report the presence of PEtn transferase-mediated colistin resistance in the zoonotic pathogen P.multocida.展开更多
背景:p53基因是一种关键的肿瘤抑制基因,最初因在调控细胞周期、DNA修复及凋亡中的核心作用而被广泛研究。近年来,研究发现p53在肌肉骨骼疾病中同样发挥重要作用,p53的异常表达和功能失调被认为是这些疾病发生和发展的重要因素,但具体...背景:p53基因是一种关键的肿瘤抑制基因,最初因在调控细胞周期、DNA修复及凋亡中的核心作用而被广泛研究。近年来,研究发现p53在肌肉骨骼疾病中同样发挥重要作用,p53的异常表达和功能失调被认为是这些疾病发生和发展的重要因素,但具体作用机制及临床转化潜力尚未系统阐明。目的:综述p53在肌肉骨骼疾病中的多重作用,分析p53影响疾病进展的分子机制,并评估p53作为跨疾病治疗靶点的潜力。方法:通过检索PubMed数据库2004年1月至2024年12月的文献,以“P53,Osteoporosis,Post-Menopausal Osteoporosis,Osteoarthritis,Degenerative Arthritis,Rheumatoid Arthritis,Gout,Low Back Pains,Low Back Ache,Back Pain,Scoliosis”为检索词,纳入原始研究、综述及临床试验等文献,排除非英文文献及无关机制研究,最终筛选81篇文献进行综合分析。结果与结论:p53通过调控成骨-破骨平衡(如p53-Nedd4-Runx2轴)、软骨细胞凋亡(如miR-34a-SIRT1-p53通路)、炎症递质(如肿瘤坏死因子α/白细胞介素6)及氧化应激(如p53-SLC2A9轴)等机制,参与肌肉骨骼疾病的发生发展。p53的双向作用(促凋亡与抗炎)提示需精准调控p53活性。基于基因编辑(如CRISPR/Cas9)、小分子抑制剂(如PFT-α)及天然产物(如柚皮苷)的干预策略展现出治疗潜力,但临床转化仍需进一步验证。未来需结合多学科技术深化p53机制研究与临床实践。展开更多
背景:目前发现miR-196b-5p在细胞增殖、迁移及抑制瘢痕增生中发挥作用,但在创面愈合过程中是否发挥作用缺乏相关研究。目的:探讨脂肪干细胞源性外泌体中miR-196b-5p对烧伤创面愈合的影响。方法:构建SD大鼠皮肤深Ⅱ度烧伤模型,随机分为4...背景:目前发现miR-196b-5p在细胞增殖、迁移及抑制瘢痕增生中发挥作用,但在创面愈合过程中是否发挥作用缺乏相关研究。目的:探讨脂肪干细胞源性外泌体中miR-196b-5p对烧伤创面愈合的影响。方法:构建SD大鼠皮肤深Ⅱ度烧伤模型,随机分为4组:空白对照组、外泌体组、agomiR-196b-5p组和外泌体+antagomiR-196b-5p组,每组10只,根据不同分组于创周注射PBS、脂肪干细胞源性外泌体、miR-196b-5p激动剂和miR-196b-5p抑制剂,伤后即刻和伤后7,14,21 d观察创面愈合情况,伤后7 d苏木精-伊红染色观察创面炎症表达,伤后14 d Masson染色观察创面胶原表达及免疫组化染色观察创面CD31表达,伤后7 d Western blot检测创面中α-平滑肌肌动蛋白、Ⅰ型胶原蛋白表达。结果与结论:①agomiR-196b-5p组创面愈合较快,空白对照组和外泌体+antagomiR-196b-5p组愈合较慢;②与空白对照组和外泌体+antagomiR-196b-5p组相比,外泌体组和agomiR-196b-5p组创面炎性细胞浸润较少,CD31表达明显增加(P<0.01);③与空白对照组和外泌体+antagomiR-196b-5p组相比,外泌体组和agomiR-196b-5p组中α-平滑肌肌动蛋白、Ⅰ型胶原蛋白表达升高(P<0.05)。结果表明,脂肪干细胞源性外泌体中miR-196b-5p能促进大鼠烧伤创面愈合。展开更多
文摘Pasteurellosis is the most prevalent, extremely contagious bacterial disease among domestic rabbits and is considered the leading cause of deaths in rabbits, resulting in enormous economic losses to the rabbit industry. Screening for bacterial agents causing mortalities in rabbits revealed the presence of Enterobacteriacae species in approximately 42% of studied cases, with E. coli the most commonly isolated organism. The present study was designed to evaluate the immune response of rabbits vaccinated with a locally prepared, combined inactivated vaccine of Pasteurella multocida and E. coli, adjuvanated with Montanide ISA70. A total of 370 rabbits, aged 2 - 3 weeks, were divided into four groups: (G1) vaccinated with a polyvalent P. multocida vaccine, (G2) vaccinated with a polyvalent E. coli vaccine, (G3) vaccinated with a combined inactivated Montanide ISA70 vaccine of P. multocida and E. coli, and (G4) kept as a non-vaccinated control group. All rabbits received two doses of 0.5 ml of the prepared vaccines, administered one month apart, and were then challenged with virulent strains of P. multocida and E. coli three weeks after the second vaccination. The prepared vaccines were evaluated by determining humoral immunity using indirect haemagglutination (IHA) test and ELISA. The potency of the vaccines was assessed through challenge and determination of LD50. Experimental findings on the prepared polyvalent combined inactivated P. multocida and E. coli vaccine indicated that it is a potent vaccine, producing the highest antibody titers and a 90% protection rate against challenges with virulent strains of P. multocida type A, D2, and E. coli types O157, O151 and O125. Thus, this vaccine is promising in addressing both P. multocida and E. coli problems in rabbits, farms, providing significant protection, and we recommend its commercial production to help rabbit producers control these two major bacterial infections.
文摘针对耦合神经P系统利用脉冲机制实现区域生长依赖于初始种子点选择的问题,提出一种自适应区域生长耦合神经P系统(adaptive region growing coupled neural P systems,ARGCNP)的图像分割方法。该方法利用金豺优化算法(golden jackal optimization,GJO)的全局搜索能力,通过引入四种策略提升GJO的全局寻优性能,从而在图像中寻找最佳阈值点,以优化区域生长中的种子点选择。在实验中,首先通过CEC2017测试函数对改进后的GJO进行性能测试,结果表明改进后的GJO在测试函数上整体性能第一;随后将ARGCNP应用于分割彩色图像和医学图像,以峰值信噪比等三个指标对分割效果进行量化评价,分割结果显示该方法能够提升分割精度及分割结果的稳定性,证明ARGCNP在应用场景下具有的优势,能够满足图像分割需求。
基金supported in part by the Hubei Provincial Natural Science Foundation of China(grant no.2023AFA094)the Yingzi Tech&Huazhong Agricultural University Intelligent Research Institute of Food Health(No.IRIFH202209)+1 种基金Fundamental Research Funds for the Central Universities(Project 2662023PY005)the Hubei Hongshan Laboratory&Huazhong Agricultural University Start-up Fund.
文摘The rapid emergence and spread of colistin-resistant gram-negative bacteria has raised worldwide public health concerns,and phosphoethanolamine(PEtn)transferase modification-mediated colistin resistance has been widely documented in multiple gram-negative bacterial species.However,whether such a mechanism exists in the zoonotic pathogen Pasteurella multocida is still unknown.Recently,a novel PEtn transferase,PetL,was identified in P.multo-cida,but whether it is associated with colistin resistance remains to be elucidated.In this study,we found that PetL in P.multocida(PetL^(PM))exhibited structural characteristics similar to those of the mobile-colistin-resistant(MCR)protein and the PEtn transferase characterized in Neisseria meningitidis.The transformation of petLPM into E.coli or K.pneumoniae changed the phenotype of several tested strains from colistin sensitive to colistin resistant.Deletion of this gene decreased the colistin minimum inhibitory concentration(MIC)of P.multocida by 64-fold.Our extensive analysis by MALDI-TOF-MS demonstrated that PetLPM participated in the modification of bacterial lipopolysaccharide(LPS)-lipid A.Deletion of petL^(PM) led to an increase in membrane charge but a decrease in cell-surface hydrophobicity and cell permeability in P.multocida.The present study is the first to report the presence of PEtn transferase-mediated colistin resistance in the zoonotic pathogen P.multocida.
文摘背景:p53基因是一种关键的肿瘤抑制基因,最初因在调控细胞周期、DNA修复及凋亡中的核心作用而被广泛研究。近年来,研究发现p53在肌肉骨骼疾病中同样发挥重要作用,p53的异常表达和功能失调被认为是这些疾病发生和发展的重要因素,但具体作用机制及临床转化潜力尚未系统阐明。目的:综述p53在肌肉骨骼疾病中的多重作用,分析p53影响疾病进展的分子机制,并评估p53作为跨疾病治疗靶点的潜力。方法:通过检索PubMed数据库2004年1月至2024年12月的文献,以“P53,Osteoporosis,Post-Menopausal Osteoporosis,Osteoarthritis,Degenerative Arthritis,Rheumatoid Arthritis,Gout,Low Back Pains,Low Back Ache,Back Pain,Scoliosis”为检索词,纳入原始研究、综述及临床试验等文献,排除非英文文献及无关机制研究,最终筛选81篇文献进行综合分析。结果与结论:p53通过调控成骨-破骨平衡(如p53-Nedd4-Runx2轴)、软骨细胞凋亡(如miR-34a-SIRT1-p53通路)、炎症递质(如肿瘤坏死因子α/白细胞介素6)及氧化应激(如p53-SLC2A9轴)等机制,参与肌肉骨骼疾病的发生发展。p53的双向作用(促凋亡与抗炎)提示需精准调控p53活性。基于基因编辑(如CRISPR/Cas9)、小分子抑制剂(如PFT-α)及天然产物(如柚皮苷)的干预策略展现出治疗潜力,但临床转化仍需进一步验证。未来需结合多学科技术深化p53机制研究与临床实践。
文摘背景:目前发现miR-196b-5p在细胞增殖、迁移及抑制瘢痕增生中发挥作用,但在创面愈合过程中是否发挥作用缺乏相关研究。目的:探讨脂肪干细胞源性外泌体中miR-196b-5p对烧伤创面愈合的影响。方法:构建SD大鼠皮肤深Ⅱ度烧伤模型,随机分为4组:空白对照组、外泌体组、agomiR-196b-5p组和外泌体+antagomiR-196b-5p组,每组10只,根据不同分组于创周注射PBS、脂肪干细胞源性外泌体、miR-196b-5p激动剂和miR-196b-5p抑制剂,伤后即刻和伤后7,14,21 d观察创面愈合情况,伤后7 d苏木精-伊红染色观察创面炎症表达,伤后14 d Masson染色观察创面胶原表达及免疫组化染色观察创面CD31表达,伤后7 d Western blot检测创面中α-平滑肌肌动蛋白、Ⅰ型胶原蛋白表达。结果与结论:①agomiR-196b-5p组创面愈合较快,空白对照组和外泌体+antagomiR-196b-5p组愈合较慢;②与空白对照组和外泌体+antagomiR-196b-5p组相比,外泌体组和agomiR-196b-5p组创面炎性细胞浸润较少,CD31表达明显增加(P<0.01);③与空白对照组和外泌体+antagomiR-196b-5p组相比,外泌体组和agomiR-196b-5p组中α-平滑肌肌动蛋白、Ⅰ型胶原蛋白表达升高(P<0.05)。结果表明,脂肪干细胞源性外泌体中miR-196b-5p能促进大鼠烧伤创面愈合。
