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Biological and physiological changes of Biomphalaria glabrata infected by Heterorhabditis bacteriophora 光秃生物phalaria感染噬菌体异habditis后的生物学和生理变化
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-09-01 Epub Date: 2025-05-14 DOI: 10.1016/j.molbiopara.2025.111679
Vinícius Menezes Tunholi-Alves , Victor Menezes Tunholi , Ludimila Santos Amaral , Natânia do Carmo Sperandio , Lorena Souza Castro Altoé , Melissa Carvalho Machado do Couto-Chambarelli , Caio Márcio de Oliveira Monteiro , Isabella Vilhena Freire Martins
The present study investigated for the first time the influence of exposure time (24 or 48 h) of Biomphalaria glabrata (Gastropoda: Pulmonata) to Heterorhabditis bacteriophora (Rhabditida: Heterorhabditidae), strain HP88, on some physiological and reproductive parameters of the host mollusk. Throughout the experiment, intense glycogenolysis was observed in both exposed groups, which was more accentuated in the digestive gland. This change was accompanied by a significant increase in the free glucose content in the exposed snails, indicating that H. bacteriophora infection induces the breakdown of host glycemic homeostasis. In parallel, significant variations in lactate dehydrogenase activity in the hemolymph of B. glabrata exposed to entomopathogenic nematodes were observed, confirming the transition from aerobic to anaerobic metabolism in the hosts. This physiological scenario contributed to the establishment of the parasitic castration process in this interface, compromising the reproductive performance of host snails, suggesting the use of H. bacteriophora HP88 as a potential alternative for control of B. glabrata.
本文首次研究了腹足目:肺足目(Gastropoda: Pulmonata)暴露于菌株Heterorhabditis bacteriophora (rhabdida: heterorhabditida: heterorhabdititidae) HP88的时间(24或48 h)对寄主软体动物某些生理和生殖参数的影响。在整个实验过程中,两个暴露组均观察到剧烈的糖原溶解,且在消化腺中更为明显。这种变化伴随着暴露的蜗牛体内游离葡萄糖含量的显著增加,表明嗜杆菌感染诱导了宿主血糖稳态的破坏。与此同时,暴露于昆虫病原线虫的光斑拟南蝽血淋巴中乳酸脱氢酶活性也发生了显著变化,证实了宿主的代谢从有氧向无氧的转变。这一生理情景促成了该界面寄生去势过程的建立,影响了寄主蜗牛的繁殖性能,表明利用H. bacteriophora HP88作为控制光斑螺的潜在替代方案。
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引用次数: 0
Calcium/calmodulin-dependent protein kinase II in Schistosoma: Relation to praziquantel action and resistance 血吸虫钙/钙调素依赖性蛋白激酶II:与吡喹酮作用和抗性的关系
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-09-01 Epub Date: 2025-05-23 DOI: 10.1016/j.molbiopara.2025.111686
Iman F. Abou-El-Naga
Calcium/calmodulin-dependent protein kinase II (CaMKII) performs diverse essential functions through integrating a range of calcium signals. In Schistosoma, two Calmodulin (CaM) genes are characterized. CaMKII exhibits distinct expression patterns across the developmental stages of the parasite. Its significance lies in sustaining Schistosoma survival and maintaining calcium homeostasis. As it is a calcium sensing protein, its function is closely related to the efficacy of praziquantel, the mainstay drug against schistosomiasis. The relationship between CaMKII and praziquantel involves several potential factors. Praziquantel induces an increased calcium influx into Schistosoma that binds CaM and activates CaMKII, which in turn mitigates the effect of the drug and potentially contributes to praziquantel resistance in several ways. By maintaining calcium homeostasis, CaMKII opposes the surge in calcium influx induced by praziquantel. It modulates voltage-gated calcium channels and reduces calcium influx. It also inhibits ryanodine receptors and inositol triphosphate receptors, thus preventing the release of calcium from the sarcoplasmic/endoplasmic reticulum. CaMKII activates nuclear factor-κB and subsequently activates sarco/endoplasmic reticulum calcium-ATPase (SERCA), which increases calcium uptake into the sarcoplasmic/endoplasmic reticulum and decreases cytosolic calcium. Nuclear factor-κB, activated by CaMKII may lead to up-regulation of P-glycoprotein, which facilitates praziquantel efflux. CaMKII also activates calcineurin that inhibits SERCA. Given its pivotal role in Schistosoma homeostasis and survival, CaMKII emerges as a promising target for novel anthelmintic therapies, and its modulation might enhance the efficacy of praziquantel.
钙/钙调素依赖性蛋白激酶II (CaMKII)通过整合一系列钙信号发挥多种基本功能。在血吸虫中,两个钙调素(CaM)基因被鉴定。CaMKII在寄生虫的不同发育阶段表现出不同的表达模式。其意义在于维持血吸虫存活和维持钙稳态。由于它是一种钙敏感蛋白,其功能与吡喹酮的疗效密切相关,吡喹酮是血吸虫病的主要药物。CaMKII与吡喹酮之间的关系涉及几个潜在因素。吡喹酮诱导更多的钙流入血吸虫,结合CaM并激活CaMKII,这反过来减轻了药物的作用,并可能以多种方式促进吡喹酮耐药性。通过维持钙稳态,CaMKII对抗吡喹酮引起的钙流入激增。它调节电压门控钙通道,减少钙流入。它还能抑制红嘌呤受体和肌醇三磷酸受体,从而阻止钙从肌浆/内质网释放。CaMKII激活核因子-κB,随后激活肌浆/内质网钙atp酶(SERCA),增加肌浆/内质网钙摄取,减少胞质钙。CaMKII激活核因子-κB可导致p-糖蛋白上调,促进吡喹酮外排。CaMKII也激活钙调磷酸酶,抑制SERCA。鉴于其在血吸虫体内平衡和生存中的关键作用,CaMKII成为新型驱虫药治疗的一个有希望的靶点,其调节可能增强吡喹酮的疗效。
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引用次数: 0
Evaluation of the efficacy of Perillyl alcohol in the treatment of Eimeria tenella infection 紫苏醇治疗柔嫩艾美耳球虫感染的疗效评价
IF 1.5 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-09-01 Epub Date: 2025-07-30 DOI: 10.1016/j.molbiopara.2025.111690
Qingyang Song , Yihao Yu , Shujing Wang , Hongmei Li , Xiaomin Zhao , Ningning Zhao , Xiao Zhang
Recently, there has been an increased focus on the development of novel anti-parasitic drugs that exhibit both highly efficacy and low toxicity due to growing concerns associated with the widespread use of such drugs. Natural products have garnered significant interest owing to their diverse biological activities and minimal adverse effects. In this study, we assessed the anti-Eimeria tenella activity of four plant compounds belonging to the Lamiaceae family, namely Perillyl alcohol, Carvone, Menthone and Perilla aldehyde. Our in vitro experiments demonstrated that all four compounds, particularly Perillyl alcohol, exhibited potent inhibition against sporulation formation of E. tenella oocyst. Furthermore, our in vivo tests revealed that treatment with these four compounds at a dose of 200 mg/kg significantly reduced oocyst shedding as well as cecal lesions and weight loss caused by E. tenella infection, thereby demonstrating moderate anti-E. tenella activity. Notably, Perillyl alcohol displayed the highest efficacy against E. tenella with an anticoccidial index (ACI) value of 161.4. In summary, our findings indicate that these four compounds derived from the Lamiaceae family exhibit anti-E. tenella activity both in vitro and in vivo, with Perillyl alcohol displaying particularly robust inhibitory effects on E. tenella. It is worthy of further investigation to explore its mechanism of action and potential therapeutic applications.
最近,由于对新型抗寄生虫药物的广泛使用日益关注,人们越来越关注开发既高效又低毒性的新型抗寄生虫药物。天然产物因其多样的生物活性和最小的副作用而引起了人们的极大兴趣。本研究对紫苏醇、香芹酮、薄荷酮和紫苏醛四种紫苏科植物化合物的抗艾美耳球虫活性进行了研究。我们的体外实验表明,这四种化合物,特别是紫苏醇,对柔嫩芽胞杆菌卵囊的孢子形成具有有效的抑制作用。此外,我们的体内试验显示,以200 mg/kg的剂量用这四种化合物治疗可显著减少卵囊脱落、盲肠病变和由tenella感染引起的体重减轻,从而显示出适度的抗e。tenella活动。紫苏醇的抗球虫指数(ACI)为161.4,效果最好。综上所述,我们的研究结果表明,这四种来自Lamiaceae家族的化合物具有抗e。在体外和体内,紫苏醇对E. tenella表现出特别强大的抑制作用。其作用机制和潜在的治疗应用值得进一步研究。
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引用次数: 0
Molecular and biochemical characterization of parasites protein phosphorylation: Emerging trends, challenges and opportunities 寄生虫蛋白磷酸化的分子和生化表征:新趋势、挑战和机遇。
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-01 Epub Date: 2025-01-28 DOI: 10.1016/j.molbiopara.2025.111675
Kayode K. Ojo, Sumiti Vinayak
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引用次数: 0
The role of complement system in a gerbil model of cutaneous leishmaniasis 补体系统在沙鼠皮肤利什曼病模型中的作用。
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-01 Epub Date: 2025-04-01 DOI: 10.1016/j.molbiopara.2025.111678
Baycan Mor , Arzu Gormez , Berna Demırcı
Leishmania species are intracellular protozoans responsible for causing both cutaneous and visceral infections. In recent years, the prevalence of leishmaniasis, a systemic and chronic disease, has been on the rise. Complement pathway mechanisms, part of the immune response of host organisms against Leishmania species, have not been fully revealed in leishmaniasis, which is very important for public health. This study aimed to explore the role of the complement system, an integral part of the immune response to Leishmania infections, in gerbil (Meriones unguiculatus) models of cutaneous leishmaniasis. This was achieved by assessing the expression levels of complement system genes (MBL-1, MBL-2, C2, and C3) and quantifying the protein levels of MBL-1, C2, and C3. Additionally, the study aimed to conduct biochemical tests, specifically measuring GSH and MDA levels, to detect oxidative stress in response to infection in gerbils. Finally, hematological analyses were performed to evaluate leukocyte counts in the blood. The expression of complement system genes and some complement system proteins were significantly increased in infected gerbils. Oxidative stress was evident, as indicated by reduced GSH levels and increased MDA levels. Additionally, a significant rise in leukocyte counts was observed as a consequence of the infection. The study concluded that complement system pathways are activated in cutaneous leishmaniasis infections. It was also determined that a thorough evaluation of genomic, proteomic, and immunopathological mechanisms is essential for understanding the pathogenesis of the disease.
利什曼原虫属细胞内原生动物,可引起皮肤和内脏感染。近年来,利什曼病(一种全身性慢性疾病)的流行率一直在上升。补体途径机制是宿主机体对利什曼原虫免疫反应的一部分,在利什曼病中尚未完全揭示,这对公共卫生具有重要意义。本研究旨在探讨补体系统在沙鼠皮肤利什曼病模型中的作用,补体系统是对利什曼感染免疫反应的一个组成部分。这是通过评估补体系统基因(MBL-1、MBL-2、C2和C3)的表达水平和量化MBL-1、C2和C3的蛋白水平来实现的。此外,该研究旨在进行生化测试,特别是测量谷胱甘肽和丙二醛水平,以检测沙鼠对感染的氧化应激反应。最后,进行血液学分析以评估血液中的白细胞计数。感染沙鼠体内补体系统基因及部分补体系统蛋白的表达显著升高。氧化应激明显,GSH水平降低,MDA水平升高。此外,白细胞计数显著上升被观察到作为感染的结果。该研究得出结论,补体系统途径在皮肤利什曼病感染中被激活。研究人员还认为,全面评估基因组学、蛋白质组学和免疫病理机制对于了解该病的发病机制至关重要。
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引用次数: 0
Impact of dandelion (Taraxacum officinale) leaf aqueous extract on immunological response of mice after Schistosoma mansoni infection 蒲公英叶水提物对小鼠感染曼氏血吸虫后免疫反应的影响。
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-01 Epub Date: 2025-01-26 DOI: 10.1016/j.molbiopara.2025.111673
Amal I. El-Refaiy , Nahed S. Amer , Amani Alhejely , Safa H. Qahl , Amira M. Shaban , Amro E. Mohamed , Amira A. Saleh , Abdelnaser A. Badawy , Mohammed A. El-Magd
This study investigated the effect of dandelion (Taraxacum officinale) leaf aqueous extract (DLE) on the immunological response of mice following infection with Schistosoma mansoni. Mice (in groups of 7) were first experimentally infected with S. mansoni and, 6 weeks later, were treated with praziquantel (PZQ) and/or DLE. Control mice were uninfected. In contrast to the untreated group, animals given PZQ and/or DLE exhibited an enhanced immunological response, as indicated by increased serum IFNγ, TNFα, IL4 and IL10 levels, increased numbers of CD4 + and CD25 + cells in blood and spleen and altered expression of apoptosis-related genes (low Bax and caspase3 and high Bcl2) in the spleen. DLE treatment had a significantly bigger impact in all these parameters compared with PZQ alone and combined DLE/PZQ treatment have the largest effect. While DLE treatment alone significantly decreased parasite burden, it did not improve upon the greater protective effect of PZQ, even when given in combination.
研究蒲公英叶水提物(DLE)对感染曼氏血吸虫小鼠免疫应答的影响。小鼠(每组7只)首先实验性感染曼氏梭菌,6周后给予吡喹酮(PZQ)和/或DLE治疗。对照组小鼠未被感染。与未治疗组相比,给予PZQ和/或DLE的动物表现出增强的免疫反应,如血清IFNγ、TNFα、IL4和IL10水平升高,血液和脾脏中CD4+和CD25+细胞数量增加,脾脏中凋亡相关基因(低Bax和caspase3和高Bcl2)表达改变。与PZQ单独治疗相比,DLE治疗对所有这些参数的影响均显著大于DLE/PZQ联合治疗,且效果最大。虽然DLE单独治疗显著降低了寄生虫负担,但即使与PZQ联合使用,也没有改善PZQ更大的保护作用。
{"title":"Impact of dandelion (Taraxacum officinale) leaf aqueous extract on immunological response of mice after Schistosoma mansoni infection","authors":"Amal I. El-Refaiy ,&nbsp;Nahed S. Amer ,&nbsp;Amani Alhejely ,&nbsp;Safa H. Qahl ,&nbsp;Amira M. Shaban ,&nbsp;Amro E. Mohamed ,&nbsp;Amira A. Saleh ,&nbsp;Abdelnaser A. Badawy ,&nbsp;Mohammed A. El-Magd","doi":"10.1016/j.molbiopara.2025.111673","DOIUrl":"10.1016/j.molbiopara.2025.111673","url":null,"abstract":"<div><div>This study investigated the effect of dandelion (<em>Taraxacum officinale</em>) leaf aqueous extract (DLE) on the immunological response of mice following infection with <em>Schistosoma mansoni</em>. Mice (in groups of 7) were first experimentally infected with <em>S. mansoni</em> and, 6 weeks later, were treated with praziquantel (PZQ) and/or DLE. Control mice were uninfected. In contrast to the untreated group, animals given PZQ and/or DLE exhibited an enhanced immunological response, as indicated by increased serum IFNγ, TNFα, IL4 and IL10 levels, increased numbers of CD4 + and CD25 + cells in blood and spleen and altered expression of apoptosis-related genes (low <em>Bax</em> and caspase3 and high <em>Bcl2</em>) in the spleen. DLE treatment had a significantly bigger impact in all these parameters compared with PZQ alone and combined DLE/PZQ treatment have the largest effect. While DLE treatment alone significantly decreased parasite burden, it did not improve upon the greater protective effect of PZQ, even when given in combination.</div></div>","PeriodicalId":18721,"journal":{"name":"Molecular and biochemical parasitology","volume":"262 ","pages":"Article 111673"},"PeriodicalIF":1.4,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143059182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In Silico and in vitro assessment of anti-leishmania infantum activity of a novel cyclohexyl-1,2,4-oxadiazole derivative 一种新型环己基-1,2,4-恶二唑衍生物抗婴儿利什曼原虫活性的体内和体外评价。
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-01 Epub Date: 2025-01-26 DOI: 10.1016/j.molbiopara.2025.111674
Cristian Vicson Gomes Pinheiro , Yasmim Mendes Rocha , João Pedro Viana Rodrigues , Gabriel Acácio de Moura , Juliana Ramos de Oliveira , Francisco Dantas Lourenço , Maria Jânia Teixeira , Valentina Nascimento Melo de Oliveira , Ronaldo Nascimento de Oliveira , Wildson Max Barbosa da Silva , Sara Ingrid Caetano Gomes Barbosa , Daniela Ribeiro Alves , Selene Maia de Morais , Roberto Nicolete
Globally, an estimated 1 billion people reside in endemic areas, and over 12 million individuals are infected with leishmaniasis. Despite its prevalence, leishmaniasis continues to be a neglected disease, mainly affecting underdeveloped countries. In Brazil, the available treatments are pentavalent antimonials and amphotericin B, which are outdated, toxic, require prolonged parenteral administration and have limited efficacy. The heterocyclic ring oxadiazole has been documented in the literature to possess various biological activities, including leishmanicidal properties, thus positioning it as a potential candidate for further investigation. This study aims to evaluate the in vitro leishmanicidal activity of an oxadiazole compound (2i), explore its mechanism of action through enzymatic inhibition and molecular docking, assess its antioxidant activity, and conduct an in silico pharmacokinetic prediction. Pharmacokinetic predictions via ADME/TOX modeling revealed that the 2i molecule exhibits good intestinal absorption (92 %), is water-insoluble (-4 log.mol/L) and demonstrates high permeability in Caco-2 cells (1.35 log.Papp10–6cm/s), suggesting potential for oral administration. Metabolic studies indicated that oxadiazole 2i is an inhibitor of cytochrome P450 enzymes CYP1A2 and CYP2C19, necessitating further evaluation of potential drug interactions. Additionally, it did not exhibit hepatotoxicity or cardiotoxicity; however, it demonstrated mutagenic potential in the salmonella reverse mutation test (AMES), which is a genetic method that detects mutagenic chemical agents, thus justifying more complex confirmatory studies. In vitro assays showed that oxadiazole 2i has DPPH (2,2-diphenyl-1-picrylhydrazyl) radical reducing activity, indicating potential antioxidant properties with an IC50 of 12.10 µg/mL. Concerning its leishmanicidal mechanism of action, molecular docking simulations at the active site of acetylcholinesterase demonstrated that the 2i molecule had superior binding energy values compared to the reference drug physostigmine (-7.39 kcal/mol versus −6.66 kcal/mol, respectively). However, the pharmacophore map revealed that physostigmine had more molecular interactions than oxadiazole 2i. In acetylcholinesterase inhibition assays, the 2i molecule exhibited significant inhibitory activity with an IC50 of 11.91 µg/mL, suggesting a mechanism of action that compromises the parasitic membrane. Moreover, the 2i molecule demonstrated significant leishmanicidal activity against L. infantum with an IC50 of 30.86 μM. Cytotoxicity assays on RAW 264.7 macrophages revealed a high CC50 value of 485.5 µM and a selectivity index (SI) of 17.86. Based on these findings, oxadiazole 2i emerges as a promising candidate for further study, offering prospects for more affordable, selective, and less toxic leishmanicidal agents.
在全球范围内,估计有10亿人居住在流行地区,1200多万人感染了利什曼病。尽管利什曼病很流行,但它仍然是一种被忽视的疾病,主要影响不发达国家。在巴西,现有的治疗方法是五价锑和两性霉素B,但这两种药物已经过时,有毒性,需要长时间的肠外给药,而且疗效有限。杂环恶二唑在文献中被证明具有多种生物活性,包括利什曼尼的特性,因此将其定位为进一步研究的潜在候选者。本研究旨在评价一种恶二唑类化合物(2i)的体外杀利什曼尼菌活性,通过酶抑制和分子对接探索其作用机制,评估其抗氧化活性,并进行计算机药代动力学预测。通过ADME/TOX模型进行的药代动力学预测显示,2i分子具有良好的肠道吸收(92%),不溶于水(-4 log.mol/L),在Caco-2细胞中具有高通透性(1.35log.Papp10-6cm/s),表明口服给药的潜力。代谢研究表明,恶二唑2i是细胞色素P450酶CYP1A2和CYP2C19的抑制剂,需要进一步评估潜在的药物相互作用。此外,它没有表现出肝毒性或心脏毒性;然而,它在沙门氏菌反向突变试验(AMES)中显示出致突变潜力,这是一种检测致突变化学剂的遗传方法,因此有理由进行更复杂的验证性研究。体外实验表明,恶二唑2i具有降低DPPH(2,2-二苯基-1-picrylhydrazyl)自由基的活性,IC50为12.10µg/mL。在乙酰胆碱酯酶活性位点的分子对接模拟表明,2i分子的结合能值优于参比药物-7.39kcal/mol和-6.66kcal/mol。药效团图谱显示,毒豆碱比恶二唑2i具有更多的分子相互作用。在乙酰胆碱酯酶抑制实验中,2i分子表现出显著的抑制活性,IC50为11.91µg/mL,表明其作用机制损害了寄生膜。此外,2i分子对婴儿乳杆菌具有显著的利什曼尼杀灭活性,IC50为30.86μM。对RAW 264.7巨噬细胞进行细胞毒性实验,CC50值高达485.5µM,选择性指数(SI)为17.86。基于这些发现,恶二唑2i成为一个有希望的进一步研究的候选者,为更经济、选择性和毒性更低的利什曼尼杀灭剂提供了前景。
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引用次数: 0
Influences of parasitic stress on the health condition of African Catfish (Clarias gariepinus): Biochemical and histopathological alterations 寄生胁迫对非洲鲶鱼健康状况的影响:生化和组织病理学改变。
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-01 Epub Date: 2025-03-09 DOI: 10.1016/j.molbiopara.2025.111677
Hadeer Abd El-hak Rashed , Nahla S. El-Shenawy , Nadia A. El-Fahla
This study investigates the prevalence, severity, and impacts of parasitic infestations in Clarias gariepinus. Additionally, the study assesses the detrimental impacts of parasite infestation on the health condition of affected catfish, focusing on biochemical and histopathological alterations. A total of 160 fish were sampled from local markets. Parasitological examinations involved the dissection of key organs from each fish. The organs were processed and examined microscopically for parasites identified based on morphometric characteristics. Parasitological indices such as prevalence, mean intensity, and abundance were calculated. Fish blood and liver samples were collected to assess hematological and biochemical parameters. Microscopic and ultrastructural examinations identified the gills and liver as highly infected organs, so they were utilized for transmission electron microscopy (TEM). Analysis of catfish tissues unveiled the existence of Cyathocotylid sp. and Prohemistomum vivax, across all organs with dominance noted in the liver, emphasizing their pathogenic significance and notable ability to invade and establish within multiple organs or the immunocompromised response of the host. Meanwhile, Centrocestus formosanus and Quadriacanthus aegyptiacus were exclusively detected in the gills, with an overall parasitic infection rate of 60 %. The present study is one of the few studies documenting Centrocestus sp. in catfish which reflects its ability to spread in new hosts and environments. A novel morphological dimension was recorded for the recovered metacercariae. The hematological, along with the identified lesions from light histological and TEM examinations in heavily infected catfish, indicate the detrimental impact of parasite infiltration on fish health status. Besides the biochemical biomarkers were significantly (p ≤ 0.05) affected by increasing the degree of infection. This study underscores the profound influence of parasitic infestations on the health of C. gariepinus, emphasizing the urgent need for effective management strategies in aquaculture to mitigate these effects, the spread of new pathogens, and ensure the sustainability and productivity of catfish farming. By integrating parasitological, morphological, histopathological, and biochemical analyses, this research provides valuable insights that contribute to better health management strategies in aquaculture and a deeper understanding of parasite biology.
本研究调查了加里宾Clarias gariepinus寄生虫侵染的流行程度、严重程度和影响。此外,该研究还评估了寄生虫侵染对受感染鲶鱼健康状况的有害影响,重点是生化和组织病理学改变。本署在本港市场共抽取160条鱼样本。寄生虫学检查包括解剖每条鱼的关键器官。对器官进行处理,并在显微镜下检查根据形态特征确定的寄生虫。计算流行率、平均强度、丰度等寄生虫学指标。采集鱼类血液和肝脏样本,评估血液学和生化参数。显微镜和超微结构检查发现鳃和肝脏是高度感染的器官,因此用透射电子显微镜(TEM)观察。对鲶鱼组织的分析揭示了Cyathocotylid sp.和Prohemistomum vivax的存在,在所有器官中都有,在肝脏中有优势,强调了它们的致病意义和在多个器官中入侵和建立的显着能力或宿主的免疫低下反应。同时,在鳃中仅检出台湾Centrocestus formosanus和埃及Quadriacanthus aegyptiacus,总体寄生虫感染率为60%。本研究是为数不多的记录鲶鱼中Centrocestus sp.的研究之一,反映了它在新宿主和新环境中的传播能力。在恢复的囊蚴中记录了一种新的形态维度。血液学,以及在严重感染的鲶鱼的光组织学和透射电镜检查中发现的病变,表明寄生虫渗透对鱼类健康状况的有害影响。此外,随着感染程度的增加,各生化指标均受到显著影响(p≤0.05)。本研究强调了寄生虫侵染对鲶鱼健康的深远影响,强调了迫切需要有效的水产养殖管理策略来减轻这些影响,防止新病原体的传播,确保鲶鱼养殖的可持续性和生产力。通过整合寄生虫学、形态学、组织病理学和生化分析,本研究为水产养殖中更好的健康管理策略和更深入地了解寄生虫生物学提供了有价值的见解。
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引用次数: 0
Metronidazole induces prostaglandin E2 formation via arachidonic acid production in protozoan parasite Giardia lamblia 甲硝唑诱导原生动物贾第鞭毛虫产生花生四烯酸形成前列腺素E2。
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-01 Epub Date: 2025-03-16 DOI: 10.1016/j.molbiopara.2025.111676
Rituparna Sarkar , Sanjib Kumar Sardar , Ajanta Ghosal , Tapas Haldar , Koushik Das , Arjun Ghosh , Akash Prasad , Yumiko Saito-Nakano , Shanta Dutta , Tomoyoshi Nozaki , Sandipan Ganguly
The causative agent of giardiasis in human and animals is the amitochondriate Giardia lamblia. We observed that exposing Giardia trophozoites to MTZ led to an increase in lipid peroxidation compared to the control group, which was expressed in terms of menadione production as it is the marker for lipo-peroxidation. Oxidative stress generated by reactive nitrogen species and peroxidation of membrane phospholipids are positively correlated with the enhanced PLA2 activity in several organisms to produce arachidonic acid (AA). Our data suggested Giardia produces a unique 56 kDa dimeric enzyme called Phospholipase B (gPLB) in contrast to higher eukaryotes which was responsible for the production of intracellular free AA. This free AA either reacylates to the cell membrane or deacylates to further produce prostaglandins. In normal un-induced controlled trophozoites the membrane reacylation process was dominant due the higher level of acyle CoA synthase (ACS) expression over the time. However, under the oxidative stressed condition the intracellular ACS expression was down regulated. This led to the increase in deacylation process. When AA deacylation becomes dominant over AA reacylation in cells, the free AA accumulates intracellularly. One of the lipid autacoids, derived from AA is prostaglandin2 (PGE2). Oxidative stress generated by reactive nitrogen species in trophozoites increased the PGE2 production via prostaglandin synthase over the time with respect to the controlled one.
人类和动物贾第虫病的病原体是带线粒体的贾第虫。我们观察到,与对照组相比,将贾第鞭毛虫滋养体暴露于MTZ导致脂质过氧化增加,这表现为甲萘醌的产生,因为它是脂质过氧化的标志。活性氮产生的氧化应激和膜磷脂的过氧化与几种生物产生花生四烯酸(AA)的PLA2活性增强呈正相关。我们的数据表明贾第鞭毛虫产生一种独特的56kDa二聚体酶,称为磷脂酶B (gPLB),与高级真核生物相比,它负责产生细胞内游离AA。这种游离的AA要么再乙酰化到细胞膜上,要么去乙酰化进一步产生前列腺素。在正常的未诱导的控制滋养体中,由于随着时间的推移,环辅酶a合成酶(ACS)的表达水平较高,膜再酰基化过程占主导地位。而在氧化应激条件下,细胞内ACS表达下调。这导致了去酰化过程的增加。当细胞内AA去酰化作用大于AA再酰化作用时,游离AA在细胞内积累。其中一种脂质类自身素,来源于AA是前列腺素2 (PGE2)。活性氮在滋养体中产生的氧化应激随着时间的推移增加了前列腺素合成酶产生的PGE2。
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引用次数: 0
Does Schistosoma mansoni trigger colorectal cancer? 曼氏血吸虫会引发结直肠癌吗?
IF 1.4 4区 医学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY Pub Date : 2025-06-01 Epub Date: 2025-01-31 DOI: 10.1016/j.molbiopara.2025.111672
Sidhant Jain
In this work the relationship between Schistosoma mansoni (Sm) and the induction and progression of colorectal cancer (CRC) is examined. Various clinical studies reviewed here yield inconsistent results, with some reporting no association between Sm infection and CRC and others suggesting a probable to strong association. Here we propose a number of plausible mechanisms whereby Sm infection might contribute to CRC induction and/or progression. These factors are (1) chronic inflammation, (2) exposure to parasite linked antigens and genotoxic products, especially soluble egg antigens (SEAs) and (3) alteration of the intestinal microbiota. These factors probably predispose humans towards CRC and can help in CRC progression however only widespread epidemiological, clinical and pathological studies can firmly establish their role or a complete lack of it.
本文研究了曼氏血吸虫(Sm)与结直肠癌(CRC)的诱导和发展之间的关系。本文回顾的各种临床研究得出了不一致的结果,一些研究报告Sm感染与CRC之间没有关联,而另一些研究则表明可能有很强的关联。在这里,我们提出了一些可能的机制,其中Sm感染可能有助于CRC的诱导和/或进展。这些因素是:(1)慢性炎症,(2)暴露于寄生虫相关抗原和基因毒性产物,特别是可溶性卵抗原(SEAs),以及(3)肠道微生物群的改变。这些因素可能使人类易患结直肠癌,并有助于结直肠癌的进展,但只有广泛的流行病学、临床和病理研究才能确定它们的作用或完全缺乏。
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Molecular and biochemical parasitology
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