53 research outputs found
The Salmonella effector SseJ disrupts microtubule dynamics when ectopically expressed in Normal Rat Kidney cells
Salmonella effector protein SseJ is secreted by Salmonella into the host cell cytoplasm where it can then modify host cell processes. Whilst host cell small GTPase RhoA has previously been shown to activate the acyl-transferase activity of SseJ we show here an un-described effect of SseJ protein production upon microtubule dynamism. SseJ prevents microtubule collapse and this is independent of SseJ's acyl-transferase activity. We speculate that the effects of SseJ on microtubules would be mediated via its known interactions with the small GTPases of the Rho family
Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set
We report a measurement of the bottom-strange meson mixing phase \beta_s
using the time evolution of B0_s -> J/\psi (->\mu+\mu-) \phi (-> K+ K-) decays
in which the quark-flavor content of the bottom-strange meson is identified at
production. This measurement uses the full data set of proton-antiproton
collisions at sqrt(s)= 1.96 TeV collected by the Collider Detector experiment
at the Fermilab Tevatron, corresponding to 9.6 fb-1 of integrated luminosity.
We report confidence regions in the two-dimensional space of \beta_s and the
B0_s decay-width difference \Delta\Gamma_s, and measure \beta_s in [-\pi/2,
-1.51] U [-0.06, 0.30] U [1.26, \pi/2] at the 68% confidence level, in
agreement with the standard model expectation. Assuming the standard model
value of \beta_s, we also determine \Delta\Gamma_s = 0.068 +- 0.026 (stat) +-
0.009 (syst) ps-1 and the mean B0_s lifetime, \tau_s = 1.528 +- 0.019 (stat) +-
0.009 (syst) ps, which are consistent and competitive with determinations by
other experiments.Comment: 8 pages, 2 figures, Phys. Rev. Lett 109, 171802 (2012
Niclosamide Prevents the Formation of Large Ubiquitin-Containing Aggregates Caused by Proteasome Inhibition
Protein aggregation is a hallmark of many neurodegenerative diseases and has been linked to the failure to degrade misfolded and damaged proteins. In the cell, aberrant proteins are degraded by the ubiquitin proteasome system that mainly targets short-lived proteins, or by the lysosomes that mostly clear long-lived and poorly soluble proteins. Both systems are interconnected and, in some instances, autophagy can redirect proteasome substrates to the lysosomes.To better understand the interplay between these two systems, we established a neuroblastoma cell population stably expressing the GFP-ubiquitin fusion protein. We show that inhibition of the proteasome leads to the formation of large ubiquitin-containing inclusions accompanied by lower solubility of the ubiquitin conjugates. Strikingly, the formation of the ubiquitin-containing aggregates does not require ectopic expression of disease-specific proteins. Moreover, formation of these focused inclusions caused by proteasome inhibition requires the lysine 63 (K63) of ubiquitin. We then assessed selected compounds that stimulate autophagy and found that the antihelmintic chemical niclosamide prevents large aggregate formation induced by proteasome inhibition, while the prototypical mTORC1 inhibitor rapamycin had no apparent effect. Niclosamide also precludes the accumulation of poly-ubiquitinated proteins and of p62 upon proteasome inhibition. Moreover, niclosamide induces a change in lysosome distribution in the cell that, in the absence of proteasome activity, may favor the uptake into lysosomes of ubiquitinated proteins before they form large aggregates.Our results indicate that proteasome inhibition provokes the formation of large ubiquitin containing aggregates in tissue culture cells, even in the absence of disease specific proteins. Furthermore our study suggests that the autophagy-inducing compound niclosamide may promote the selective clearance of ubiquitinated proteins in the absence of proteasome activity
Interactions within the Western Flower Thrips/Tomato Spotted Wilt Virus/Host Plant Complex on Virus Epidemiology
Liver alanine aminotransferase, insulin resistance and endothelial dysfunction in normotriglyceridaemic subjects with type 2 diabetes mellitus
and -0.31 [-0.58 to -0.03] respectively). Conclusions In metabolically well-controlled patients with DM2, ALT levels are related to decreased insulin-sensitivity and an impaired conduit vessel vascular function. Eur J Clin Invest 2005; 35(6): 369 -37
Verbena as a trap crop to suppress thrips-transmitted Tomato spotted wilt virus in chrysanthemums
Efeito de um programa de condicionamento fÃsico no broncoespasmo induzido pelo exercÃcio em mulheres obesas Effect of a physical fitness program on the exercise-induced bronchospasm in obese women
O broncoespasmo induzido pelo exercÃcio fÃsico (BIE) é uma sÃndrome clÃnica caracterizada pelo estreitamento brônquico e ocorre mais frequentemente em indivÃduos obesos. OBJETIVO: Avaliar o possÃvel efeito de um programa de condicionamento fÃsico em relação ao BIE em mulheres obesas. MÉTODOS: Trinta e duas mulheres foram divididas em três grupos: grupo A (obesidade ou sobrepeso + treinamento fÃsico), grupo B (obesidade ou sobrepeso) e grupo C (controle). Foi aplicado um teste de caminhada de seis minutos antes e após um perÃodo de 12 semanas. O BIE foi verificado por meio de um monitor de pico de fluxo expiratório após a aplicação do teste de caminhada. Durante essas 12 semanas, para o grupo A um programa de atividade fÃsica foi conduzido três vezes por semana e cada sessão de 60 minutos foi composta por 10 minutos de alongamento, seguidos por 30 de exercÃcios aeróbios (50% da frequência cardÃaca de reserva como intensidade), 15 de exercÃcios de força de baixa intensidade e cinco de relaxamento e alongamento. RESULTADOS: O programa de treinamento fÃsico causou aumento significativo no pico de fluxo expiratório mÃnimo após o teste de esforço (pré: 379 ± 16l/min; pós: 405 ± 12l/min; p < 0,05) e reduziu em 50% (33% para 17%) a proporção de mulheres que apresentou BIE (p < 0,05). CONCLUSÃO: O programa de condicionamento fÃsico de 12 semanas foi capaz de melhorar a função respiratória de mulheres obesas.<br>Exercise-induced bronchospasm (EIB) is a syndrome characterized by reduced bronchial lumen and happens more often in obese subjects. OBJECTIVE: To evaluate the possible effect of an exercise training program on EIB in obese women. METHODS: 32 women were divided in three groups: group A (obesity + exercise training), group B (obesity) and group C (control). A six-minute walking test was applied before and after 12 weeks. EIB was measured through a monitor of peak of expiratory flow used after the application of the walking test. During the12 weeks, an exercise training program was delivered to group A, three times a week, 60 minutes a day. Each exercise session consisted of 10 minutes of stretching exercises, followed by 30 minutes of aerobic exercise (50% of reserve heart rate as intensity), 15' of low-intensity strength training and 5' of stretching and relaxing exercises. RESULTS: Exercise training significantly increased minimum peak of expiratory flow after the walking test (before: 379±16 l/min; after: 405±12 l/min; p<0.05) and reduced in 50% (33% to 17%) the proportion of women who presented EIB (p<0.05). CONCLUSION: The 12-week exercise training increased the respiratory function of obese women
Control of Liriomyza langei on chrysanthemum by Diglyphus isaea produced with a standard or modified parasitoid rearing technique
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