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Immunization with recombinant V10 protects cynomolgus macaques from lethal pneumonic plague 下载免费PDF全文
Cornelius CA Quenee LE Overheim KA Koster F Brasel TL Elli D Ciletti NA Schneewind O 《Infection and immunity》2008,76(12):5588-5597
Vaccine and therapeutic strategies that prevent infections with Yersinia pestis have been sought for over a century. Immunization with live attenuated (nonpigmented) strains and immunization with subunit vaccines containing recombinant low-calcium-response V antigen (rLcrV) and recombinant F1 (rF1) antigens are considered effective in animal models. Current antiplague subunit vaccines in development for utilization in humans contain both antigens, either as equal concentrations of the two components (rF1 plus rLcrV) or as a fusion protein (rF1-rLcrV). Here, we show that immunization with either purified rLcrV (a protein at the tip of type III needles) or a variant of this protein, recombinant V10 (rV10) (lacking amino acid residues 271 to 300), alone or in combination with rF1, prevented pneumonic lesions and disease pathogenesis. In addition, passive immunization studies showed that specific antibodies of macaques immunized with rLcrV, rV10, or rF1, either alone or in combination, conferred protection against bubonic plague challenge in mice. Finally, we found that when we compared the reactivities of anti-rLcrV and anti-rV10 immune sera from cynomolgus macaques, BALB/c mice, and brown Norway rats with LcrV-derived peptides, rV10, but not rLcrV immune sera, lacked antibodies recognizing linear LcrV oligopeptides. 相似文献
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Grapevine leafroll syndrome is caused by a complex of up to nine different Grapevine leafroll-associated viruses (GLRaV-1-9) with GLRaV-2 being reported as one of the most variable species of this group. Many methods, including indexing, serological and molecular procedures, have been developed for the detection of GLRaV-2. However, due to the low concentration of the virus in plants and the high variability of GLRaV-2, a method with improved sensitivity and with the capacity to detect of all known variants is required. Such improvement is essential for grapevine rootstocks, as these are suspected to harbour frequent GLRaV-2 infections difficult to detect, thus contributing to the spread of the leafroll disease. The development of new universal primers is described using a target sequence located in the 3' end of the virus genome. These primers were combined with a one-step SYBR Green real-time RT-PCR assay to achieve quantitative detection. All 43 GLRaV-2 isolates tested in this study were identified readily and reproducibly, regardless of their geographical origin or variety of grapevine. Using the procedure developed in this study, the sensitivity was increased 125 times compared to a conventional single-tube RT-PCR. This real-time method opens new perspectives for the sanitary selection of grapevine and in leafroll 2 disease monitoring. 相似文献
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Lauriane Jugé Anne Petiet Simon A. Lambert Pascal Nicole Simon Chatelin Valerie Vilgrain Bernard E. Van Beers Lynne E. Bilston Ralph Sinkus 《NMR in biomedicine》2015,28(12):1763-1771
Magnetic Resonance Elastography (MRE) uses macroscopic shear wave propagation to quantify mechanical properties of soft tissues. Micro‐obstacles are capable of affecting the macroscopic dispersion properties of shear waves. Since disease or therapy can change the mechanical integrity and organization of vascular structures, MRE should be able to sense these changes if blood vessels represent a source for wave scattering. To verify this, MRE was performed to quantify alteration of the shear wave speed cs due to the presence of vascular outgrowths using an aortic ring model. Eighteen fragments of rat aorta included in a Matrigel matrix (n=6 without outgrowths, n=6 with a radial outgrowth extent of ~600µm and n=6 with ~850µm) were imaged using a 7 Tesla MR scanner (Bruker, PharmaScan). High resolution anatomical images were acquired in addition to multi‐frequency MRE (ν = 100, 115, 125, 135 and 150 Hz). Average cs was measured within a ring of ~900µm thickness encompassing the aorta and were normalized to cs0 of the corresponding Matrigel. The frequency dependence was fit to the power law model cs ~νy. After scanning, optical microscopy was performed to visualize outgrowths. Results demonstrated that in presence of vascular outgrowths (1) normalized cs significantly increased for the three highest frequencies (Kruskal‐Wallis test, P = 0.0002 at 125 Hz and P = 0.002 at 135 Hz and P = 0.003 at 150 Hz) but not for the two lowest (Kruskal‐Wallis test, P = 0.63 at 100 Hz and P = 0.87 at 115 Hz), and (2) normalized cs followed a power law behavior not seen in absence of vascular outgrowths (ANOVA test, P < 0.0001). These results showed that vascular outgrowths acted as micro‐obstacles altering the dispersion relationships of propagating shear waves and that MRE could provide valuable information about microvascular changes. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Romain Vazquez Claire Breal Loria Zalmai Chloe Friedrich Carole Almire Adrien Contejean Sylvain Barreau Eric Grignano Lise Willems Benedicte Deau-Fischer Patricia Franchi Marguerite Vignon Justine Decroocq Rudy Birsen Lauriane Goldwirt Sophie Kaltenbach Lucile Couronne Michaela Fontenay Olivier Kosmider Didier Bouscary Nicolas Chapuis 《Blood cancer journal》2021,11(3)
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