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Prevention of congenital malformations for pregnant women: a predictive model based on a study in eastern Algeria’s population 预防孕妇先天性畸形:基于阿尔及利亚东部人口研究的预测模型
Pub Date : 2021-07-12 DOI: 10.4081/JBR.2021.9394
Adel Kalla, L. Loucif, M. Yahia
The World Health Organization (WHO) defines congenital malformation as any gross abnormality present at birth even if it is not immediately recognized. Here, we aimed to identify the factors predisposing to congenital malformations in pregnant women in Eastern Algeria and the effect of the combination of several factors. 786 pregnant women were interviewed. Throughout our study, we sought to find answers, discuss the association between malformation exposure, identify the risk factors, and predict the occurrence of malformations using statistical analysis techniques. We developed a predictive model and we found that malformations were significantly higher for pregnant women aged over 34 (10.93; 95%CI: 2.10-201.71, p=0.023), with a BMI over 25 (2.38; 0.91-7.04, p=0.091), hypertension (2.18; 1.04-4.57, p=0.038), anemia (2.08; 0.98-4.35, p=0.053) and infections (2.32; 1.18-4.58; p=0.015). Protecting factors against malformations includes diet moderate in meat (1.97; 0.73-4.98, p=0.163) and rich in eggs, soft drinks, and fruit-vegetables (2.69; 0.76-8.63, p=0.106), (1.84; 0.74-4.43, p=0.177), (3.08; 0.56-13.28, p=0.154); respectively. Knowing risk factors helps to establish predictive models and strategies to prevent malformations and highlights the link between malformations and multiple risk factors for the sake of protecting babies’ lives.
世界卫生组织(WHO)将先天性畸形定义为出生时出现的任何严重异常,即使它不能立即被发现。在这里,我们的目的是确定因素易患先天性畸形的孕妇在阿尔及利亚东部和影响几个因素的组合。共采访了786名孕妇。在整个研究过程中,我们试图找到答案,讨论畸形暴露之间的关系,确定危险因素,并使用统计分析技术预测畸形的发生。我们开发了一个预测模型,我们发现34岁以上的孕妇畸形明显更高(10.93;95%CI: 2.10-201.71, p=0.023), BMI超过25 (2.38;0.91-7.04, p=0.091),高血压(2.18;1.04 ~ 4.57, p=0.038),贫血(2.08;0.98-4.35, p=0.053)和感染(2.32;1.18 - -4.58;p = 0.015)。防止畸形的因素包括适度的肉类饮食(1.97;0.73-4.98, p=0.163),富含鸡蛋、软饮料和水果蔬菜(2.69;0.76-8.63, p=0.106), (1.84;0.74-4.43, p=0.177), (3.08;0.56 - -13.28, p = 0.154);分别。了解危险因素有助于建立预防畸形的预测模型和策略,并强调畸形与多种危险因素之间的联系,以保护婴儿的生命。
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引用次数: 0
Total phenolic and flavonoids contents and in vitro evaluation of antioxidant activity of several Calendula officinalis (Marigold) extracts 金盏菊几种提取物的总酚和总黄酮含量及体外抗氧化活性评价
Pub Date : 2021-04-28 DOI: 10.4081/JBR.2021.9680
M. Chroho, A. Drioiche, Soukaina Saidi, T. Zair, L. Bouissane
The search for natural antioxidants to replace synthetic antioxidants is one of humanity’s health priorities. Medicinal and Aromatic Plants (MAP) contain phenolic compounds that act as natural antioxidants. The aim of this work is to study total phenols and flavonoids contents and evaluate the antioxidant power of various extracts of Calendula officinalis. Extracts were prepared in two steps: hot solid-liquid extraction, by Soxhlet and from the plant powder using a solvent (Methanol/water 70/30, Acetone/water 70/30) followed by a liquid-liquid extraction by splitting the obtained extract by two increasingly polarized solvents (Ethyl acetate and Butanol). Total phenols and flavonoids were evaluated using gallic acid and quercetin as standards, respectively. The antioxidant activity of extracts was determined by DPPH (2,2-diphényl 1-picrylhydrazyle) free radical reduction method. The two crude fractions of Methanol and Acetone presented the highest levels of total phenols (7,58±0,38 mg GAE/g dm and 6,80±0,34 mg GAE/g dm respectively), and flavonoids (7,37±0,37 mg QE/g dm and 7,93±0,40 mg QE/g dm respectively). Ethyl acetate fractions showed a high antioxidant activity. This study demonstrated that extracts from Calendula officinalis flowers present a promising source of natural antioxidant.
寻找天然抗氧化剂来取代合成抗氧化剂是人类健康的优先事项之一。药用和芳香植物(MAP)含有作为天然抗氧化剂的酚类化合物。研究金盏菊不同提取物的总酚和总黄酮含量,并对其抗氧化能力进行评价。提取物的制备分为两步:索氏热固液萃取法和用溶剂(甲醇/水70/30,丙酮/水70/30)从植物粉末中提取,然后用两种极化程度越来越高的溶剂(乙酸乙酯和丁醇)分离得到的提取物,进行液液萃取。以没食子酸和槲皮素为标准评价总酚和总黄酮含量。采用DPPH (2,2- diphassnyl - 1- picryhydrazyle)自由基还原法测定提取物的抗氧化活性。总酚(7.58±0.38 mg GAE/g dm和6.80±0.34 mg GAE/g dm)和总黄酮(7.37±0.37 mg QE/g dm和7.93±0.40 mg QE/g dm)含量最高。乙酸乙酯组分具有较高的抗氧化活性。本研究表明金盏花提取物是一种很有前途的天然抗氧化剂来源。
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引用次数: 2
Variability and inheritance of fiber length and wilt resistance in a complex 4-5 specific and backcross hybridization of cotton 4-5个棉花特异回交杂交中纤维长度和抗枯萎性的变异与遗传
Pub Date : 2021-03-01 DOI: 10.4081/JBR.2021.9243
Sayfulla G. Boboyev, Gulnoza Toshpulatova, I. Amanturdiev, M. Mirakhmedov
In this paper presents data of researches about fiber length in the 4-5 species. The largest number of plants with the indicated analyzed trait in hybrid combinations, obtained with the participation of the variety Omad, appeared with a number of variations in fiber length at 35,0-36,0 mm and above. Investigation of 4-species hybrids of F2 and back cross hybridization allowed some improvement in the average value of trait when compared with F1. Despite the emergence of transgressive plants with fiber length 36,1-37,0 mm and above, the average trait of composite 5 species hybrids F2 remained almost at the level of F1, i.e. 35.5-36.0 mm. The greatest number of positive recombinants occurred in 5 species back crossing developed with the participation of Termez-31.
本文介绍了4-5种植物纤维长度的研究资料。在Omad品种参与的杂交组合中,具有上述性状的植株数量最多,纤维长度在35、0 ~ 36、0 mm及以上出现了许多变化。对F2的4种杂交种进行调查和回交杂交,其性状平均值较F1有一定提高。尽管出现了纤维长度为36,1 ~ 37,0 mm及以上的越侵植株,但复合5种杂交F2的平均性状基本保持在F1的35.5 ~ 36.0 mm水平。在Termez-31参与的回交中,阳性重组数最多的是5个种。
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引用次数: 0
Effect of Exercise Training on Gene Expression of Adiponectin and its Receptors in Testicles and Sex Hormones in Diabetic Rats 运动训练对糖尿病大鼠睾丸脂联素及其受体基因表达及性激素的影响
Pub Date : 2021-02-18 DOI: 10.4081/JBR.2021.9287
Z. Nadi, M. Bayat, Hadi Karami, M. Parastesh, P. Bayat
Adiponectin and its receptors are expressed in the male reproductive system, which play a role in regulating male sex hormones and fertility. Diabetes was induced by Streptozotocin-Nicotinamide (STZ-NA i.p) in rats and after performing the trainings, adiponectin gene expression and its receptors in the testis were evaluated using real time PCR, and blood serum was then used in order to assess FSH, LH and testosterone. The STZ-NA significantly increased the fasting blood glucose, gene expression of adiponectin AdipoR1 in the testicles of diabetic rats. A significant reduction in serum testosterone and LH levels were observed in the diabetic group. Resistance and endurance training decreased blood glucose, adiponectin and AdipoR1 gene, and also increased the serum testosterone and LH levels in diabetic rats. Overall, our data suggest the role played by training in improve expression of adiponectin and AdipoR1 gene by increasing the serum testosterone and LH levels in type 2 diabetic rats.    
脂联素及其受体在男性生殖系统中表达,在调节男性性激素和生育能力中起作用。采用链脲唑素-烟酰胺(STZ-NA i.p)诱导大鼠糖尿病,训练结束后采用real - time PCR检测大鼠睾丸脂联素基因及其受体的表达,并测定血清FSH、LH和睾酮水平。STZ-NA显著提高糖尿病大鼠空腹血糖、睾丸脂联素AdipoR1基因表达。糖尿病组血清睾酮和黄体生成素水平显著降低。抵抗和耐力训练降低糖尿病大鼠血糖、脂联素和AdipoR1基因,提高血清睾酮和LH水平。总的来说,我们的数据表明,训练通过增加2型糖尿病大鼠的血清睾酮和LH水平来改善脂联素和AdipoR1基因的表达。
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引用次数: 3
Protein-peptide composition in the lungs of rats with hyperhomocysteinemia 高同型半胱氨酸血症大鼠肺中的蛋白肽组成
Pub Date : 2021-01-01 DOI: 10.4081/jbr.2021.9858
N. Raksha, T. Halenova, T. Vovk, O. Kharchenko, O. Savchuk, I. Samborska, N. Zaichko, L. Ostapchenko, O. Maievskyi
The accumulated data indicate that a high level of homocysteine may be a central pathogenetic factor of chronic obstructive pulmonary disease. In this study, we investigated the effect of hyperhomocysteinemia on protein homeostasis in the rat lungs. The level of proteins, peptides, total proteolytic activity, as well as protein-peptide composition, were evaluated. Hyperhomocysteinemia was induced by daily intragastric administration of DL-homocysteine thiolactone (100 mg·kg-1 of body weight) to albino non-linear male rats for 28 days. Twelve hours after the last administration, the rats were sacrificed and the lungs were harvested. Our findings showed that hyperhomocysteinemia caused the disturbances in the protein homeostasis in the lungs that are manifested by a decrease in the level of proteins in the young and old animals and an increase in the level of peptides in the rats of all studied groups. We found a change in the protein composition in the lung of HM rats - a decrease in the level of proteins with a molecular weight of 50 kDa to 100 kDa simultaneously with an increase in the level of proteins with a molecular weight of less than 50 kDa. Despite the fact that the peptide profile was the same in both control animals and HM animals, the level of individual peptide fractions increased significantly in the rats with HM. Obtained data could contribute to explain, at least in part, the mechanisms involved in the pathogenesis of lung damage in hyperhomocysteinemia.
积累的数据表明,高水平的同型半胱氨酸可能是慢性阻塞性肺疾病的中心致病因素。在这项研究中,我们研究了高同型半胱氨酸血症对大鼠肺部蛋白质稳态的影响。蛋白质、多肽水平、总蛋白水解活性以及蛋白-肽组成均被评估。白化非线性雄性大鼠每日灌胃dl -同型半胱氨酸硫内酯(100 mg·kg-1体重)诱导高同型半胱氨酸血症28 d。末次给药12小时后,处死大鼠,取肺。我们的研究结果表明,高同型半胱氨酸血症引起肺部蛋白质稳态的紊乱,表现为年轻和年老动物的蛋白质水平下降,而所有研究组的大鼠的肽水平增加。我们发现HM大鼠肺中的蛋白质组成发生了变化——分子量为50 - 100 kDa的蛋白质水平下降,同时分子量小于50 kDa的蛋白质水平上升。尽管在对照动物和HM动物中肽谱是相同的,但HM大鼠的个体肽组分水平显著增加。获得的数据可以至少部分地解释高同型半胱氨酸血症中肺损伤的发病机制。
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引用次数: 3
GC-MS analysis and antibacterial activity of the Sea cucumber (Muelleria lecanora) extract 海参提取物的GC-MS分析及抑菌活性研究
Pub Date : 2021-01-01 DOI: 10.4081/jbr.2021.9765
M. Yusuf, Nur Fitriani Usdyana Attahmid
Sea cucumbers are marine invertebrates commonly found in benthic areas and deep seas. On a global scale, they have a high commercial value with an increased level of production and trade. This study aims to analyze the bioactive compound in Sea cucumber (Muelleria lecanora) using the Ultrasound-Assisted Extraction Method (UAE) and Gas Chromatography-Mass Spectrometry (GC-MS). Furthermore, it identifies the antibacterial activity in microorganisms Salmonella, Escherichia coli, and Staphylococcus aureus. The bioactive compounds were extracted using methanol, acetone, and n-hexane solvent and were separated by ultrasound-assisted extraction. In the initial stage, phytochemicals were screened using Gas Chromatography-Mass Spectrometry (GC-MS). Disc diffusion method was then used to determine the antibacterial activity against Salmonella, Staphylococcus aureus, and Escherichia coli. The results showed that methanol extract is more suitable for extracting bioactive compounds of Muelleria lecanora than acetone and n-hexane. Meanwhile, acetone solvents are more suitable for the production of flavonoid and steroid compounds than Mulleria lecanora samples. Heneicosane compounds that function as a new antiproliferative for inhibition of tumor and cancerous cells are produced from n-hexane. The antibacterial activity of acetone, methanol and n-hexane extract determined by diffusion assay was effective against Staphylococcus aureus and Salmonella but ineffective against Escherichia coli. GC-MS results showed that the major constituents obtained were steroid and flavanoid. From this study, Sea cucumber extract can be considered a healthy nutrient in food and pharmaceutical products.
海参是一种海洋无脊椎动物,常见于底栖区和深海。在全球范围内,随着生产和贸易水平的提高,它们具有很高的商业价值。本研究采用超声辅助提取法(UAE)和气相色谱-质谱联用技术(GC-MS)对海参(Muelleria lecanora)中的生物活性成分进行分析。此外,它还鉴定了对微生物沙门氏菌、大肠杆菌和金黄色葡萄球菌的抗菌活性。采用甲醇、丙酮和正己烷溶剂提取,超声辅助提取分离。在初始阶段,使用气相色谱-质谱(GC-MS)筛选植物化学物质。采用圆盘扩散法测定其对沙门氏菌、金黄色葡萄球菌和大肠杆菌的抑菌活性。结果表明,甲醇提取物比丙酮和正己烷更适合提取勒氏菌的活性成分。同时,丙酮溶剂比乳酸菌样品更适合生产类黄酮和甾类化合物。正己烷是一种新的抗肿瘤和癌细胞增殖的化合物。扩散法测定丙酮、甲醇和正己烷提取物对金黄色葡萄球菌和沙门氏菌的抑菌活性,对大肠杆菌的抑菌活性无效。GC-MS结果表明,其主要成分为甾类化合物和类黄酮。由此可见,海参提取物可作为一种健康的营养物质应用于食品和医药产品中。
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引用次数: 1
Biological investigations on the role of hydrogel formulations containing bioactive natural agents against some common phytopathogens of Phaseolus vulgaris L. and seed germination 含有天然生物活性剂的水凝胶制剂对菜豆常见病原菌的抑制作用及种子萌发的生物学研究
Pub Date : 2020-10-22 DOI: 10.4081/jbr.2020.9219
H. S. Elshafie, M. Nuzzaci, G. Logozzo, Tania Gioia, I. Camele
Recent scientific research have manipulated the use of hydrogel in seed coating technology based on synthetic and chemical additives. The current study has been carried out to evaluate the biological activity of new seed coating formulations containing hydrogel based on natural substances or beneficial microorganisms on seed germination and controlling some common diseases of Phaseolus vulgaris L. New formulations have been prepared as single mixtures of hydrogel with the following bioactive substances: i) oregano Essential Oil (org EO); ii) Ornithine Lipid (OL); and two microorganisms i) Burkholderia gladioli and ii) Trichoderma harzianum T22. Results revealed that, the hydrogel formulation based org EO showed the highest significant activity against the majority of tested phytopathogens in a dose dependent manner. Regarding the antagonistic microbial activity, results showed that hydrogel formulations based T. harzianum T22 and B. gladioli were able to significantly reduce the growth of the majority of tested phytopathogens. In addition, the highest significant percentage of seed germination has been achieved using the formulations of B. gladioli and org EO. Regarding the disease incidence suppression assay, results explicated that org EO and OL were able to significantly inhibit the fungal disease incidence on P. vulgaris seeds steadily depending on the tested concentrations. In conclusion, the use of natural bioactive substances in hydrogel formulation would greatly reduce dependence on chemical pesticides and hence decreasing the environmental pollution and eventual harmful effects on plant, animal and human health.
近年来的科学研究将水凝胶应用于基于合成添加剂和化学添加剂的种子包衣技术。本文研究了以天然物质或有益微生物为基础的水凝胶新型种包剂对菜豆种子萌发和防治菜豆常见病害的生物活性,并将水凝胶与以下生物活性物质单组分混合制备了新型种包剂:1)牛至精油(org EO);ii)鸟氨酸脂(OL);和两种微生物i)剑兰伯克氏菌和ii)哈茨木霉T22。结果表明,水凝胶制剂对大部分植物病原菌的活性最高,且呈剂量依赖性。在拮抗微生物活性方面,结果表明,基于T. harzianum T22和B. gladioli的水凝胶制剂能够显著抑制大多数被试植物病原体的生长。此外,使用剑兰和剑兰的配方,种子发芽率最高。在真菌病害抑制实验中,结果表明,不同浓度的有机有机提取物和有机有机提取物均能显著抑制真菌病害的发生。总之,在水凝胶配方中使用天然生物活性物质将大大减少对化学农药的依赖,从而减少对环境的污染,并最终减少对植物、动物和人类健康的有害影响。
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引用次数: 8
Antibacterial and anti-inflammatory effects of lime (Citrus aurantifolia) peel extract in Balb/c mice infected by Salmonella typhi 酸橙皮提取物对感染伤寒沙门氏菌的Balb/c小鼠的抑菌和抗炎作用
Pub Date : 2020-09-28 DOI: 10.4081/jbr.2020.8951
V. Kasim, M. Hatta, R. Natzir, V. Hadju, Y. Hala, Budu, G. Alam, S. As'ad, Ami Febriza, H. Idrus
Lime (Citrus aurantifolia) is a traditional plant that is widely used as antibacterial. This study proves the effect of Lime Peel Extract (LPE) on the colonization and growth, mediated by the activity of IL-6, of bacteria Salmonella typhi in Balb/c mice. Mice were divided into four groups; LPE 510 mg/kg body weight (bw), LPE 750 mg/kgbw, and positive and negative control. The examination was carried out 3 times, on the 5th day before the intervention, on the 10th day after the intervention and on the 30th day after maintenance. Intervention of LPE for 5 days can decrease the number of S. typhi colonies, even maintenance for 20 days after the intervention showed no bacterial growth. IL-6 pro-inflammatory cytokine activity increased on examination day 5 after S. typhi injection and decreased after intervention on day 10, it was significantly different between pre and post at all groups except for negative controls (p=0.15). The speed of decrease in IL-6 levels was the greatest at the LPE 750 mg/kgbw (velocity=-5.64%). LPE decreased serum levels of IL-6 and inhibited the growth of S. typhi colony in Balb/c mice. LPE has potential for antibacterial and anti-inflammatory.
酸橙(Citrus aurantifolia)是一种传统的植物,被广泛用于抗菌。本研究证实了青柠皮提取物(LPE)在IL-6活性介导下对Balb/c小鼠伤寒沙门氏菌定殖和生长的影响。将小鼠分为四组;LPE 510 mg/kg体重(bw), LPE 750 mg/kgbw,阳性对照和阴性对照。分别于干预前第5天、干预后第10天、维持后第30天进行3次检查。LPE干预5 d可使斑疹伤寒沙门氏菌菌落数量减少,干预后维持20 d仍未见细菌生长。IL-6促炎细胞因子活性在伤寒沙门氏菌注射后检查第5天升高,干预后检查第10天降低,除阴性对照组外,各组患者IL-6促炎细胞因子活性与干预前、后比较差异均有统计学意义(p=0.15)。在LPE为750 mg/kgbw时,IL-6下降速度最快(-5.64%)。LPE降低Balb/c小鼠血清IL-6水平,抑制伤寒沙门氏菌菌落生长。LPE具有抗菌和抗炎的潜力。
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引用次数: 3
Examination of hepato-renal functions and lipid panel among pregnant women with preeclampsia in Sétif, Algeria 阿尔及利亚ssametf先兆子痫孕妇肝肾功能和血脂检查
Pub Date : 2020-09-07 DOI: 10.4081/jbr.0.9035
R. Bourouba
Preeclampsia (PE) is a multisystem pregnancy disease inflecting maternal, fetal mortality and morbidity. This case-control study aims to determine the biochemical changes in lipid profile, hepatic and renal functions among sixty preeclamptic women compared to sixty age-matching normotensive pregnant women from the Maternity Hospital in Sétif, Algeria. Several biomarkers were collected and have been determined by appropriate kits. Association between various parameters was evaluated using Pearson’s correlation coefficient, with significance at P<0.05. The PE women showed a significant increase in serum aminotransferase, gamma-glutamyl-transferase, alkaline phosphatase, as well as total cholesterol, triglycerides, urea, uric acid, and creatinine levels. However, a significant decrease in platelets, total protein, albumin, and plasma sodium levels were found in PE group. A positive correlation between aminotransferases and renal biomarkers was observed.PE has deleterious effects on liver and renal functions, and could be predicted by evaluating hepatic and renal biomarkers as well as lipid profile in the early stage of disease, for targeted prevention strategies in our population. Further studies on genetic assessment in cases of PE are needed for a better understanding of this disease’s pathophysiology in Algeria.
子痫前期(PE)是一种影响母体、胎儿死亡率和发病率的多系统妊娠疾病。本病例对照研究旨在确定60名子痫前期妇女与60名年龄匹配的血压正常孕妇在脂质、肝脏和肾脏功能方面的生化变化。收集了几种生物标志物,并通过适当的试剂盒进行了测定。采用Pearson相关系数评价各参数间的相关性,P<0.05为显著性。PE组妇女血清转氨酶、谷氨酰基转移酶、碱性磷酸酶以及总胆固醇、甘油三酯、尿素、尿酸和肌酐水平显著升高。然而,PE组血小板、总蛋白、白蛋白和血浆钠水平显著降低。转氨酶与肾脏生物标志物呈正相关。PE对肝脏和肾脏功能有有害影响,可以通过在疾病早期评估肝脏和肾脏生物标志物以及脂质谱来预测,为我们的人群提供有针对性的预防策略。需要进一步研究PE病例的遗传评估,以便更好地了解阿尔及利亚这种疾病的病理生理学。
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引用次数: 0
Fibrinogenolytic activity of protease from the culture fluid of Pleurotus ostreatus 平菇培养液蛋白酶的纤维蛋白原溶解活性
Pub Date : 2020-08-19 DOI: 10.4081/jbr.2020.9006
S. Ye, Chernyshenko, Kucheriavyi Ye
The use of proteases makes it possible to obtain partially hydrolyzed forms of macromolecules with unique properties. The importance of proteases for studying the structure and functions of fibrinogen forces scientists to search for new sources of highly specific proteases. Thus, the aim of this work was to study the content of the Pleurotus ostreatus culture fluid in search of fibrinogen- specific proteases. P. ostreatus was cultured for 14 days at 27°C. The culture fluid was collected and the protein fraction was salted out with NaCl and then dialyzed. Fibrinogen hydrolysis products by P. ostreatus protease were characterized using SDS PAGE under reducing conditions followed by immunoprobing using murine monoclonal antibodies I-5A (anti-Aα505-610) and 2d2a (anti-Bβ26-42). The study of turbidity and platelet aggregation was performed using a Multiskan FC spectrophotometric microplate reader and a SOLAR-2110 aggregometer, respectively. Electron microscopy of fibrils formed by truncated compared with native fibrins was performed using a transmission electron microscope N-600. Analysis of the products of fibrinogen hydrolysis with a fungal protease using SDS-PAGE demonstrated the cleavage of the alpha chain of fibrinogen exclusively with the formation of a truncated form of fibrinogen in which there are no C-terminal portions of αC regions with a molecular weight of 25 kDa. A study of turbidity showed that the polymerization of truncated fibrin is significantly impaired. The rate of lateral association of protofibrils significantly decreased from 1.5 to 2.2 times in the case of truncated fibrinogen compared to the native one depending on the initial concentration of fibrinogen. It was shown that platelet aggregation in the presence of fibrinogen without 25 kDa fragments of αC regions was less effective than in the presence of native fibrinogen. Application of the preparation of the fungal protease allows us to obtain high molecular forms of the fibrinogen molecule with cleaved 25 kDa peptides, which provide new information on the role of these peptides in the fibrinogen functioning.
蛋白酶的使用使得获得具有独特性质的部分水解形式的大分子成为可能。蛋白酶对研究纤维蛋白原结构和功能的重要性迫使科学家们寻找高度特异性蛋白酶的新来源。因此,本研究的目的是研究平菇培养液中纤维蛋白原特异性蛋白酶的含量。P. ostreatus在27℃下培养14天。收集培养液,用NaCl盐腌出蛋白质部分,然后透析。在还原条件下,利用SDS - PAGE对纤维蛋白原水解产物进行了表征,然后用小鼠单克隆抗体I-5A(抗a α505-610)和2d2a(抗b β26-42)进行了免疫探针检测。浊度和血小板聚集的研究分别使用Multiskan FC分光光度微孔板仪和SOLAR-2110聚集仪进行。用N-600透射电子显微镜对截断的纤维蛋白与天然纤维蛋白形成的原纤维进行电镜观察。利用SDS-PAGE对真菌蛋白酶水解纤维蛋白原的产物进行分析,发现纤维蛋白原α链完全断裂,形成截断形式的纤维蛋白原,其中αC区没有c端部分,分子量为25 kDa。浊度的研究表明,截断纤维蛋白的聚合明显受损。根据纤维蛋白原的初始浓度,截断纤维蛋白原的原原纤维的横向结合率显著降低,从1.5倍到2.2倍。结果表明,没有αC区25 kDa片段的纤维蛋白原存在时,血小板聚集的效果不如天然纤维蛋白原存在时。真菌蛋白酶的制备使我们能够获得纤维蛋白原分子的高分子形式,这为这些肽在纤维蛋白原功能中的作用提供了新的信息。
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引用次数: 1
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Bollettino della Societa italiana di biologia sperimentale
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