Search results for "récepteur"
showing 10 items of 45 documents
Plasma membrane protein trafficking in plant-microbe interactions: a plant cell point of view
2014
International audience; In order to ensure their physiological and cellular functions, plasma membrane (PM) proteins must be properly conveyed from their site of synthesis, i.e., the endoplasmic reticulum, to their final destination, the PM, through the secretory pathway. PM protein homeostasis also relies on recycling and/or degradation, two processes that are initiated by endocytosis. Vesicular membrane trafficking events to and from the PM have been shown to be altered when plant cells are exposed to mutualistic or pathogenic microbes. In this review, we will describe the fine-tune regulation of such alterations, and their consequence in PM protein activity. We will consider the formatio…
The Recent Development of a Sweet-Tasting Brazzein and its Potential Industrial Applications
2016
International audience; Brazzein is a small heat- and pH-stable sweet-tasting protein isolated from the West African plant, Pentadiplandra brazzeana. Brazzein combines a highly sweet potency, a long history of human consumption, and a remarkable stability, giving it great potential as a natural sweetener. Due to the difficulties of obtaining brazzein from its natural source, several efforts have been made to express brazzein using various heterologous expression systems. This chapter describes the biochemical, structural, sensory, and physiological properties of brazzein. We will summarize the current knowledge of the structure-activity relationship of brazzein. The biotechnological product…
Taste Perception of Nutrients Found in Nutritional Supplements: A Review
2019
open access review pii: nu11092050.; International audience; Nutritional supplements are prescribed when one's nutritional status is not conducive to good health. These foodstuffs constitute concentrated sources of nutrients such as vitamins, minerals, amino acids, and fatty acids. For nutritional supplements to be effective, patients must consume the amount that has been prescribed for the recommended period of time. Therefore, special attention must be given to the sensory attributes of these products. Indeed, the presence of active compounds can cause an off-taste or aftertaste. These negative sensations can lead to a reduction in the consumption of nutritional supplements and reduce the…
Lutter contre les infections bactériennes : le système immunitaire des plantes est aussi très efficace !
2016
SPE IPM UB CNRS Agrosup
Sweeteners and sweetness enhancers
2017
indexation en cours; PURPOSE OF REVIEW: The current review summarizes and discusses current knowledge on sweeteners and sweetness enhancers. RECENT FINDINGS: The perception of sweet taste is mediated by the type 1 taste receptor 2 (T1R2)/type 1 taste receptor 3 (T1R3) receptor, which is expressed in the oral cavity, where it provides input on the caloric and macronutrient contents of ingested food. This receptor recognizes all the compounds (natural or artificial) perceived as sweet by people. Sweeteners are highly chemically diverse including natural sugars, sugar alcohols, natural and synthetic sweeteners, and sweet-tasting proteins. This single receptor is also the target for developing …
P059 Le lipido-récepteur intestinal CD36 et sa cascade de signalisation ERK1/2 dépendante contrôle la synthèse des chylomicrons
2013
International audience; Introduction et but de l’étude. – L’intestin est capable d’adapter sa capacité d’absorption à la teneur en lipide du régime. Cette adaptation implique un système de détection des lipides au niveau entérocytaire. Le CD36, qui est une glycoprotéine transmembranaire liant avec une forte affinité les acides gras à longue chaîne (AGLC), pourrait jouer ce rôle. En effet, ex vivo, la présence d’AGLC est associée à une activation de la voie ERK1/2 et conduit à l’induction de protéines clés du métabolisme intestinal des lipides : l’ApoB48 et la MTP. Cette régulation est CD36 dépendante (Tran et al. 2011). De plus, la déficience de CD36 est associée chez l’Homme et l’animal à …
Le goût : physiologie, rôles et dysfonctionnements
2013
Article de vulgarisation; National audience; The sense of taste involves multimodal sensory activation to detect and identify many flavors. Today, five primary tastes have been identified (sweet, salt, sour, bitter and umami). These are often combined to form complex tastes. The physiology of gustatory pathways is complex. The activation of gustatory receptors located in the mouth leads to an ascendant pathway through the neurons of the solitary nucleus in the brainstem and the neurons located in the thalamus. After the thalamus, the gustative signal modulates the ipsilateral primary taste cortex and then the secondary taste area. The secondary taste cortex, which combines representations o…
Upregulation of liver VLDL receptor and FAT/CD36 expressions in LDLR-/- apoB100/100 mice fed trans-10,cis-12 conjugated linoleic acid
2006
International audience; This study explores the mechanisms responsible for the fatty liver setup in mice fed trans-10,cis-12 conjugated linoleic acid (t10c12 CLA), hypothesizing that an induction of low density lipoprotein receptor (LDLR) expression is associated with lipid accumulation. To this end, the effects of t10c12 CLA treatment on lipid parameters, serum lipoproteins, and expression of liver lipid receptors were measured in LDLR(-/-) apoB(100/100) mice as a model of human familial hypercholesterolemia itself depleted of LDLR. Mice were fed t10c12 CLA over 2 or 4 weeks. We first observed that the treatment induced liver steatosis, even in the absence of LDLR. Mice treated for 2 weeks…
Identification of the cell-wall derived xyloglucan as a new damage-associated molecular pattern (DAMP) eliciting plant immunity in Vitis vinifera and…
2018
Activation of the plant immune responses requires recognition of common pathogen-associated molecular pattern (PAMP) by their cognate pattern recognition receptors (PRR). Chitin, a major component of fungal cell walls, is a well-known PAMP that triggers defense responses in several mammal and plant species.In the first part of this study, we show that two chitooligosaccharides, chitin and chitosan, act as PAMPs in grapevine (Vitis vinifera) as they elicit immune signaling events, defense gene expression, and resistance against pathogens. These two PAMPs are active in grapevine suggesting that at least one perception system exists. Phylogenetic analysis clearly distinguished three V. vinifer…
La galectine-9 se lie aux récepteurs agonistes de TRAIL et régule l'apoptose induite par TRAIL
2021
APO2L/TRAIL (TNF-related apoptosis-inducing ligand) arouses great interest in cancer therapy. This protein induces apoptosis in tumor cells through DR4 or DR5, two transmembrane glycoproteins that harbor N- and O- glycosylations, respectively. The glycosylation of DR4 or DR5 receptors is likely to allow unforseen protein/protein interactions. For instance, galectins, owing to their ability to bind to oligosaccharides, can interact with glycoproteins, and are therefore potentially able to regulate TRAIL pro-apoptotic machinery in tumor cells. Given in addition that conventional chemotherapeutic drugs such as 5-fluorouracil (5FU), often restore or increase TRAIL-induced apoptosis, but that th…