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Registros recuperados: 16
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Antennal pathways in the central nervous system of a blood-sucking bug, Rhodnius prolixus Inra
Barrozo, R.B.; Couton, L.; Lazzari, C.R.; Insauti, T.C.; Minoli, S.A.; Fresquet, N.; Rospars, J.P.; Anton, S..
The haematophagous bug Rhodnius prolixus has been a model system in insect physiology for a long time. Recently, several studies have been devoted to its sensory systems, including olfaction. However, few data are available on the basic organisation of the nervous system in this species. By means of neuronal backfills, histology, confocal microscopy and three-dimensional reconstruction methods, we have characterized the projection patterns of antennal sensory neurons within the central nervous system of this disease-vector insect. We established the first partial three-dimensional map of the antennal lobe (AL) of a hemipteran insect. The ALs of this species are relatively diffuse structures, which nevertheless show a glomerular organisation. Based on...
Tipo: Journal Article Palavras-chave: RHODNIUS PROLIXUS; ARTHROPODA; HEXAPODA; INSECTE; HEMIPTERA; SYSTEME NERVEUX CENTRAL; NEURONE; OLFACTION; HISTOLOGIE; MICROSCOPIE CONFOCALE; CARTE TRIDIMENSIONNELLE; LOBE ANTENNAIRE; GLOMERULE; HETEROPTERA; REDUVIIDAE ANTENNAL LOBE; THREE-DIMENSIONAL RECONSTRUCTION; QUANTITATIVE ANALYSIS; DISEASE-VECTOR INSECT; ANTENNAL PROJECTIONS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010f9cf078d&uri=/notices/prodinra1/2010/11/
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Calcium activates a chloride conductance likely involved in olfactory receptor neuron repolarization in the moth Spodoptera littoralis Inra
Pézier, A.; Grauso, M.; Acquistapace, A.; Monsempes, C.; Rospars, J.P.; Lucas, P..
The response of insect olfactory receptor neurons (ORNs) to odorants involves the opening of Ca2+-permeable channels, generating an increase in intracellular Ca2+ concentration. Here, we studied the downstream effect of this Ca2+ rise in cultured ORNs of the moth Spodoptera littoralis. Intracellular dialysis of Ca2+ from the patch pipette in whole-cell patch-clamp configuration activated a conductance with a K-1/2 of 2.8 mu M. Intracellular and extracellular anionic and cationic substitutions demonstrated that Cl- carries this current. The anion permeability sequence I- > NO3- > Br- > Cl- > CH3SO(3)(-) >> gluconate(-) of the Ca2+-activated Cl- channel suggests a weak electrical field pore of the channel. The Ca2+-activated current partly...
Tipo: Journal Article Palavras-chave: CALCIUM; OLFACTION; NEURONE; RECEPTEUR; MITE; SPODOPTERA LITTORALIS; LEPIDOPTERA; INSECTE; CANAL A CALCIUM; CHLORURE; PERMEABILITE; CONCENTRATION; TENEUR EN CALCIUM NUCLEOTIDE-GATED CHANNELS; SMOOTH-MUSCLE-CELLS; PROTEIN-KINASE-C; ANTENNAL NEURONS; SENSORY NEURONS; IN-VITRO; CURRENTS; TRANSDUCTION; VOLUME; CILIA.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010398ba406&uri=/notices/prodinra1/2010/10/
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Classification of stimuli based on stimulus-response curves and their variability Inra
Lansky, P.; Pokora, O.; Rospars, J.P..
Neuronal responses evoked in sensory neurons by static stimuli of various intensities are usually characterized by their input-output transfer function, i.e. by plotting the firing frequency (or any other measurable neuron response) versus the corresponding stimulus intensity. The aim of the present article is to determine the stimulus intensities which can be considered as "the most important" from two different points of view: transferring as much information as possible and coding the intensity as precisely as possible. These two problems are very different because, for example, an informative signal may be difficult to identify. We show that the role of noise is crucial in both problems. To obtain the range of stimuli which are the best identified, we...
Tipo: Journal Article Palavras-chave: BRUIT; NEURONE; STIMULUS; PROPRIETE SENSORIELLE; TEST DE FISHER; METHODE STATISTIQUE; MODELISATION; MODELE GENERIQUE; THEORIE DE L'INFORMATION; TRANSFERT DE L'INFORMATION FISHER INFORMATION; INFORMATION THEORY; NOISE; RESPONSE CURVE; SENSORY NEURONS; STIMULUS IDENTIFICATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010822d069&uri=/notices/prodinra1/2010/10/
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Competition-based model of pheromone component ratio detection in the moth Inra
Zavada, A.; Buckley, C.L.; Martinez, D.; Rospars, J.P.; Nowotny, T..
For some moth species, especially those closely interrelated and sympatric, recognizing a specific pheromone component concentration ratio is essential for males to successfully locate conspecific females. We propose and determine the properties of a minimalist competition-based feed-forward neuronal model capable of detecting a certain ratio of pheromone components independently of overall concentration. This model represents an elementary recognition unit for the ratio of binary mixtures which we propose is entirely contained in the macroglomerular complex (MGC) of the male moth. A set of such units, along with projection neurons (PNs), can provide the input to higher brain centres. We found that (1) accuracy is mainly achieved by maintaining a certain...
Tipo: Journal Article Palavras-chave: PAPILLON NOCTURNE PHEROMONE DETECTION; MOTH; COMPETITION BASED MODEL; NEURON.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011dbea3dea&uri=/notices/prodinra1/2011/05/
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Competitive and noncompetitive odorant interactions in the early neural coding of odorant mixtures Inra
Rospars, J.P.; Lansky, P.; Chaput, M.; Duchamp-Viret, P..
Most olfactory receptor neurons (ORNs) express a single type of olfactory receptor that is differentially sensitive to a wide variety of odorant molecules. The diversity of possible odorant-receptor interactions raises challenging problems for the coding of complex mixtures of many odorants, which make up the vast majority of real world odors. Pure competition, the simplest kind of interaction, arises when two or more agonists can bind to the main receptor site, which triggers receptor activation, although only one can be bound at a time. Noncompetitive effects may result from various mechanisms, including agonist binding to another site, which modifies the receptor properties at the main binding site. Here, we investigated the electrophysiological...
Tipo: Journal Article Palavras-chave: CODAGE; MODELE; OLFACTION; NEURONE; RECEPTEUR; ODEUR; INTERACTION MOLECULAIRE; CONCENTRATION; ANALYSE STATISTIQUE  SENSORY CODING; OLFACTORY RECEPTOR NEURON; IN VIVO; SIGNAL TRANSDUCTION; ALLOSTERY; MIXTURE INTERACTION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20105031bac0&uri=/notices/prodinra1/2010/10/
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Computational model of the insect pheromone transduction cascade Inra
Gu, Y.; Lucas, P.; Rospars, J.P..
All sensory neurons transduce their natural stimulus, whether a molecule, a photon, or a mechanical force, in an electrical current flowing through their sensory membrane via similar molecular and ionic mechanisms. Olfactory receptor neurons (ORNs), whose stimuli are volatile molecules, are no exception, including one of the best known: the exquisitely sensitive ORNs of male moths that detect the sexual pheromone released by conspecific females. We provide a detailed computational model of the intracellular molecular mechanisms at work in this ORN type. We describe qualitatively and quantitatively how the initial event, the interaction of pheromone molecules with specialized receptors at the ORN surface, is amplified through a sequence of linked...
Tipo: Journal Article Palavras-chave: MODELE; INSECTE; PHEROMONE; NEURONE; RECEPTEUR; MITE; PROTEINE; ACTIVITE ENZYMATIQUE; CANAL A CALCIUM; CANAL A POTASSIUM; PROTEINE KINASE C; CALMODULINE; OLFACTION OLFACTORY RECEPTOR NEURONS; PROTEIN-KINASE-C; DROSOPHILA ODORANT RECEPTORS; ANTHERAEA-POLYPHEMUS; CHLORIDE CURRENT; PHOSPHOLIPASE-C; BOMBYX-MORI; SENSILLA TRICHODEA; DEGRADING ENZYME; CATION CHANNELS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010634023e&uri=/notices/prodinra1/2010/10/
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Dynamical modeling of the moth pheromone-sensitive olfactory receptor neuron within its sensillar environment Inra
Gu, Y.; Rospars, J.P..
In insects, olfactory receptor neurons (ORNs), surrounded with auxiliary cells and protected by a cuticular wall, form small discrete sensory organs – the sensilla. The moth pheromone-sensitive sensillum is a well studied example of hair-like sensillum that is favorable to both experimental and modeling investigations. The model presented takes into account both the molecular processes of ORNs, i.e. the biochemical reactions and ionic currents giving rise to the receptor potential, and the cellular organization and compartmentalization of the organ represented by an electrical circuit. The number of isopotential compartments needed to describe the long dendrite bearing pheromone receptors was determined. The transduction parameters that must be modified...
Tipo: Journal Article Palavras-chave: NEURONE RECEPTEUR OLFACTIF; SENSILLE; MODELISATION DYNAMIQUE NEURON; PHEROMONE RECEPTOR; MOTH; DYNAMICAL MODELING.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011b0fe9ca5&uri=/notices/prodinra1/2011/05/
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Efficient olfactory coding in the pheromone receptor neuron of a moth Inra
Kostal, L.; Lansky, P.; Rospars, J.P..
Efficient coding is an overarching principle, well tested in visual and auditory neurobiology, which states that sensory neurons are adapted to the statistical characteristics of their natural stimulus - in brief, neurons best process those stimuli that occur most frequently. To assess its validity in olfaction, we examine the pheromone communication of moths, in which males locate their female mates by the pheromone they release. We determine the characteristics of the pheromone plume which are best detected by the male reception system. We show that they are in agreement with plume measurements in the field, so providing quantitative evidence that this system also obeys the efficient coding principle. Exploring the quantitative relationship between the...
Tipo: Journal Article Palavras-chave: ANTHERAEA POLYPHEMUS; INSECTE; LEPIDOPTERA; ANALYSE STATISTIQUE; CHEMORECEPTEUR; MODELE CINETIQUE; MITE; OLFACTION; PHEROMONE; NEURONE; RECEPTEUR; STIMULATION; COMMUNICATION; MODELISATION; PROBABILITE ORIENTAL FRUIT MOTH; ANTHERAEA-POLYPHEMUS; KINETIC-MODEL; INFORMATION; STIMULATION; PLUMES; CELLS; CHEMORECEPTORS; FLUCTUATIONS; ACTIVATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010f45c7b7b&uri=/notices/prodinra1/2010/10/
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Modelling and sensitivity analysis of the reactions involving receptor, G-protein and effector in vertebrate olfactory receptor neurons Inra
Halnes, G.; Ulfhielm, E.; Eklöf Ljunggren, E.; Hellgren-Kotaleski, J.; Rospars, J.P..
A biochemical model of the receptor, G-protein and effector (RGE) interactions during transduction in the cilia of vertebrate olfactory receptor neurons (ORNs) was developed and calibrated to experimental recordings of cAMP levels and the receptor current (RC). The model describes the steps from odorant binding to activation of the effector enzyme which catalyzes the conversion of ATP to cAMP, and shows how odorant stimulation is amplified and delayed by the RGE transduction cascade. A time-dependent sensitivity analysis was performed on the model. The model output-the cAMP production rate-is particularly sensitive to a few, dominant parameters. During odorant stimulation it depends mainly on the initial density of G-proteins and the catalytic constant for...
Tipo: Journal Article Palavras-chave: NEURONE; RECEPTEUR; MODELE BIOCHIMIQUE; MODELISATION; PROTEINE; ANALYSE STATISTIQUE; SENSITIVITE OLFACTION; RECEPTOR NEURON; BIOCHEMICAL MODEL; SENSITIVITY ANALYSIS; RECEPTOR POTENTIAL; SIGNAL TRANSDUCTION.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010de3b6771&uri=/notices/prodinra1/2010/10/
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Odour transduction in olfactory receptor neurons Inra
Rospars, J.P.; Gu, Y.; Gremiaux, A.; Lucas, P..
The molecular mechanisms that control the binding of odorant to olfactory receptors and transduce this signal into membrane depolarization are reviewed. They are compared in vertebrates and insects for interspecific (allelochemicals) and intraspecific (pheromones) olfactory signals. Attempts to develop quantitative models of these multistage signalling networks are presented. Computational analysis of olfactory transduction is still in its infancy and appears as a promising area for future developments.
Tipo: Journal Article Palavras-chave: SIGNAUX OLFACTIFS OLFACTORY RECEPTORS; IONIC CHANNELS; OBPS; PHEROMONES; COMPUTER MODELS.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011bbdb20b0&uri=/notices/prodinra1/2011/05/
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Ornstein-Uhlenbeck model neuron revisited Inra
Lansky, P.; Rospars, J.P..
The temporal patterns of action potentials fired by a two-point stochastic neuron model were investigated. In this model the membrane potential of the dendritic compartment follows the Orstein-Uhlenbeck process and is not affected by the spiking activity. The axonal compartment, corresponding to the spike initiation site, is described by a simplified RC circuit. Estimators of the mean and variance of the input, based on a sampling of the axonal membrane potential, were derived and applied to simulated data. The dependencies of the mean firing frequency and of the coefficient of variation and serial correlation of interspike intervals on the mean and variance of the input were also studied by computer simulation in both 1- and 2-point models. The main...
Tipo: Journal Article Palavras-chave: FREQUENCE LINEAIRE; NEURONE; BRUIT.
Ano: 1995 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9600003053057621&uri=/notices/prodinra1/2010/11/
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Quantitative analysis of sex-pheromone coding in the antennal lobe of the moth Agrotis ipsilon: a tool to study network plasticity Inra
Jarriault, D.; Gadenne, C.; Rospars, J.P.; Anton, S..
To find a mating partner, moths rely on pheromone communication. Released in very low amounts, female sex pheromones are used by males to identify and localize females. Depending on the physiological state (i.e. age, reproductive state), the olfactory system of the males of the noctuid moth Agrotis ipsilon is `switched on or off'. To understand the neural basis of this behavioural plasticity, we performed a detailed characterization of the qualitative, quantitative and temporal aspects of pheromone coding in the primary centre of integration of pheromonal information, the macroglomerular complex (MGC) of the antennal lobe. MGC neurons were intracellularly recorded and stained in sexually mature virgin males. When stimulating antennae of males with the...
Tipo: Journal Article Palavras-chave: AGROTIS IPSILON; ARTHROPODA; HEXAPODA; INSECTE; PHEROMONE; MITE; PLASTICITE; ATTRACTIF SEXUEL; NEURONE; OLFACTION; LOBE ANTENNAIRE OLFACTORY CODING; MOTH; ANTENNAL LOBE; SEX-PHEROMONE; PROJECTION NEURON; SPIKE TRAIN ANALYSIS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010352d8cb4&uri=/notices/prodinra1/2010/10/
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Selectivity improvement in a model of olfactory receptor neuron with adsorption-desorption noise Inra
Vidybida, A.K.; Usenko, A.S.; Rospars, J.P..
In biological olfactory systems, interaction of odorant molecules with olfactory receptor proteins is driven by Brownian motion. As a result, at chemical equilibrium, the total number of bound receptors changes randomly in time. Here we investigate the role of this effect, known in physics as adsorption-desorption noise, in the discriminating ability of olfactory receptor neurons. For this purpose we developed a computer program, which generates the adsorption-desorption process in a model neuron. We compared the processes resulting from two different odorants with different affinities for the receptor proteins. We took into account the threshold at which spikes are triggered and we calculated the neuronal selectivity due to the differences in the...
Tipo: Journal Article Palavras-chave: OLFACTION; RECEPTEUR; PROTEINE; NEURONE; MODELISATION; PROGRAMME INFORMATIQUE; ANALYSE STATISTIQUE; ODEUR; CONCENTRATION  OLFACTORY RECEPTOR PROTEIN; OLFACTORY RECEPTOR NEURON; ADSORPTION-DESORPTION NOISE; SELECTIVITY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201062459e5&uri=/notices/prodinra1/2010/10/
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Stochastic model neuron without resetting of dendritic potential : application to the olfactory system Inra
Rospars, J.P.; Lansky, P..
A two-dimensional neuronal model, in which the membrane potential of the dendrite evolves independently from that at the trigger zone of the axon, is proposed and studied. In classical one-dimensional neuronal models the dendritic and axonal potentials cannot be distinguished, and thus they are reset to resting level after firing of an action potential, whereas in the present model the dendritic potential is not reset. The trigger zone is modelled by a simplified leaky integrator (RC circuit) and the dendritic compartment can be described by any of the classical one-dimensional neuronal models. The new model simulates observed features of the firing dynamics which are not displayed by classical models, namely positive correlation between interspike...
Tipo: Journal Article Palavras-chave: MODELE STOCHASTIQUE; MODELE A DEUX DIMENSIONS; POTENTIEL DE MEMBRANE; SYSTEME OLFACTIF; NEURONE; ANALYSE SPECTRALE; ELECTROPHYSIOLOGIE.
Ano: 1993 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9400009943038340&uri=/notices/prodinra1/2010/11/
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Three-dimensional antennal lobe atlas of the oriental fruit moth, Cydia molesta (Busck) (Lepidoptera: Tortricidae): comparison of male and female glomerular organization Inra
Varela, N.; Couton, L.; Gemeno, C.; Avilla, J.; Rospars, J.P.; Anton, S..
The oriental fruit moth Cydia molesta is an important pest and the behavioural role of olfactory signals such as pheromones and plant volatiles have been studied extensively in both sexes. To understand odour processing further, however, detailed knowledge of the anatomy of the olfactory system is crucial. In the present study, an atlas of the antennal lobe (AL) is presented based on the three-dimensional reconstructions of both ALs of three male and three female brains by means of neuroanatomical and computational approaches. We identified 48-49 "ordinary" glomeruli and one large glomerulus situated at the entrance of the antennal nerve in males, and 49-52 "ordinary" glomeruli and one large glomerulus in the ventro-medial part of the AL in females....
Tipo: Journal Article Palavras-chave: LOBE ANTENNAIRE; MITE; PHEROMONE; LEPIDOPTERA; TORTRICIDAE; GLOMERULE; INSECTE; COMPORTEMENT ANIMAL; ATTRACTIF SEXUEL; CARTE TRIDIMENSIONNELLE; CARTOGRAPHIE OLFACTION; COMPUTATIONAL NEUROANATOMY; ATLAS; ANTENNAL LOBE; ORIENTAL FRUIT MOTH; CYDIA MOLESTA.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010c0e61cd2&uri=/notices/prodinra1/2011/05/
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Transformation of the sex pheromone signal in the noctuid moth agrotis ipsilon: From peripheral input to antennal lobe output Inra
Jarriault, D.; Gadenne, C.; Lucas, P.; Rospars, J.P.; Anton, S..
How information is transformed along synaptic processing stages is critically important to understand the neural basis of behavior in any sensory system. In moths, males rely on sex pheromone to find their mating partner. It is essential for a male to recognize the components present in a pheromone blend, their ratio, and the temporal pattern of the signal. To examine pheromone processing mechanisms at different levels of the olfactory pathway, we performed single-cell recordings of olfactory receptor neurons (ORNs) in the antenna and intracellular recordings of central neurons in the macroglomerular complex (MGC) of the antennal lobe of sexually mature Agrotis ipsilon male moths, using the same pheromone stimuli, stimulation protocol, and response...
Tipo: Journal Article Palavras-chave: AGROTIS IPSILON; LEPIDOPTERA; NOCTUIDAE; NEURONE; RECEPTEUR; OLFACTION; MITE; INSECTE; ARTHROPODA; HEXAPODA; NOCTUIDAE; LOBE ANTENNAIRE; ATTRACTIF SEXUEL; STIMILUS INTRACELLULAR RECORDING; MACROGLOMERULAR COMPLEX; MGC NEURON; OLFACTORY CODING; OLFACTORY RECEPTOR NEURON; SINGLE SENSILLUM RECORDING.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20105ff8856a&uri=/notices/prodinra1/2010/11/
Registros recuperados: 16
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