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101.
Neha Koonjoo Elodie Parzy Philippe Massot Matthieu Lepetit‐Coiffé Sylvain R. A. Marque Jean‐Michel Franconi Eric Thiaudiere Philippe Mellet 《CONTRAST MEDIA & MOLECULAR IMAGING》2014,9(5):363-371
There is an increasing interest in developing novel imaging strategies for sensing proteolytic activities in intact organisms in vivo. Overhauser‐enhanced MRI (OMRI) offers the possibility to reveal the proteolysis of nitroxide‐labeled macromolecules thanks to a sharp decrease of the rotational correlation time of the nitroxide moiety upon cleavage. In this paper, this concept is illustrated in vivo at 0.2 T using nitroxide‐labeled elastin orally administered in mice. In vitro, this elastin derivative was OMRI‐visible and gave rise to high Overhauser enhancements (19‐fold at 18 mm nitroxide) upon proteolysis by pancreatic porcine elastase. In vivo three‐dimensional OMRI detection of proteolysis was carried out. A keyhole fully balanced steady‐state free precession sequence was used, which allowed 3D OMRI acquisition within 20 s at 0.125 mm3 resolution. About 30 min after mouse gavage, proteolysis was detected in the duodenum, where Overhauser enhancements were 7.2 ± 2.4 (n = 7) and was not observed in the stomach. Conversely, orally administered free nitroxides or pre‐digested nitroxide‐labeled elastin were detected in the mouse's stomach by OMRI. Combined with specific molecular probes, this Overhauser‐enhanced MRI technique can be used to evaluate unregulated proteolytic activities in various models of experimental diseases and for drug testing. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Gao XM Agrotis A Autelitano DJ Percy E Woodcock EA Jennings GL Dart AM Du XJ 《Endocrinology》2003,144(9):4097-4105
Sex differences in cardiomyopathic phenotype and the role of gonadal status were studied in mice with cardiac overexpression of beta(2)-adrenergic receptors (ARs) over 6-15 months (mo) of age. Survival to 15 mo was 96% in wild-type mice but was poorer in transgenic (TG) mice and lower for males than females (13% vs. 56%, P < 0.001). Echocardiography demonstrated progressive left ventricular (LV) dilatation and reduction in LV fractional shortening in male but much less marked changes in female TG mice. Incidences of atrial thrombosis, pleural effusion and lung congestion were higher and myocyte size and fibrosis in the LV were greater in TG males than females. Deprivation of testicular hormones by castration during 3-15 mo of age improved survival and significantly ameliorated LV dysfunction, remodeling, and hypertrophy compared with intact TG males. No significant effect, except for a trend of a better survival, was detected by ovariectomy in TG females. In conclusion, cardiac beta(2)-AR overexpression at a high level leads to cardiomyopathy and heart failure with aging. Female mice had less cardiac remodeling, dysfunction, and pathology and a marked survival advantage over male mice, and this was independent of prevailing levels of ovarian hormones. TG males showed benefit from orchiectomy, suggesting a contribution by testicular hormones to the progression of the cardiomyopathic phenotype. 相似文献
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TACI, unlike BAFF-R, is solely activated by oligomeric BAFF and APRIL to support survival of activated B cells and plasmablasts 总被引:3,自引:0,他引:3
Bossen C Cachero TG Tardivel A Ingold K Willen L Dobles M Scott ML Maquelin A Belnoue E Siegrist CA Chevrier S Acha-Orbea H Leung H Mackay F Tschopp J Schneider P 《Blood》2008,111(3):1004-1012
The cytokine BAFF binds to the receptors TACI, BCMA, and BAFF-R on B cells, whereas APRIL binds to TACI and BCMA only. The signaling properties of soluble trimeric BAFF (BAFF 3-mer) were compared with those of higher-order BAFF oligomers. All forms of BAFF bound BAFF-R and TACI, and elicited BAFF-R-dependent signals in primary B cells. In contrast, signaling through TACI in mature B cells or plasmablasts was only achieved by higher-order BAFF and APRIL oligomers, all of which were also po-tent activators of a multimerization-dependent reporter signaling pathway. These results indicate that, although BAFF-R and TACI can provide B cells with similar signals, only BAFF-R, but not TACI, can respond to soluble BAFF 3-mer, which is the main form of BAFF found in circulation. BAFF 60-mer, an efficient TACI agonist, was also detected in plasma of BAFF transgenic and nontransgenic mice and was more than 100-fold more active than BAFF 3-mer for the activation of multimerization-dependent signals. TACI supported survival of activated B cells and plasmablasts in vitro, providing a rational basis to explain the immunoglobulin deficiency reported in TACI-deficient persons. 相似文献
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Pierre Gallian Sbastien Lhomme Pascal Morel Sylvie Gross Carole Mantovani Lisette Hauser Xavier Tinard Elodie Pouchol Rachid Djoudi Azzedine Assal Florence Abravanel Jacques Izopet Pierre Tiberghien 《Emerging infectious diseases》2020,26(12):2881
Hepatitis E has emerged as a major transfusion-transmitted infectious risk. Two recipients of plasma from 2 lots (A and B) of pooled solvent/detergent–treated plasma were found to be infected by hepatitis E virus (HEV) that was determined to have been transmitted by the solvent/detergent–treated plasma. HEV RNA viral loads were 433 IU in lot A and 55 IU in lot B. Retrospective studies found that 100% (13/13) of evaluable lot A recipients versus 18% (3/17) of evaluable lot B recipients had been infected by HEV (p<0.001), albeit not necessarily at time of transfusion. Among evaluable recipients, 86% with a transfused HEV RNA load >50,000 IU were infected, most likely by the HEV-containing solvent/detergent–treated plasma, versus only 7% with a transfused HEV RNA load <50,000 IU (p<0.001). Overall, solvent/detergent–treated plasma might harbor HEV. Such an occurrence might result in a dose-dependent risk for transfusion-transmitted hepatitis E. 相似文献