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Articles :. SNAP-25 Modulation of Calcium Dynamics underlies Differences in GABAergic and Glutamatergic Responsiveness To Depolarisation Claudia Verderio & Michella Mateolli Neuron,Vol 4, 599-610, February 19,2004. Physiological processes :. Memory Learning Orientation.

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Articles :

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  1. Articles : SNAP-25 Modulation of Calcium Dynamics underlies Differences in GABAergic and Glutamatergic Responsiveness To Depolarisation Claudia Verderio & Michella Mateolli Neuron,Vol 4, 599-610, February 19,2004

  2. Physiological processes : Memory Learning Orientation Pathological processes : Epilepsy Ischemia Alzheimer HIPPOCAMPUS Tranche d`Hippocampe

  3. Deux types de neurones Pyramidal cells 90% Interneurones (10 %) GLUTAMATE GABA Excitation Inhibition

  4. Cellule pyramidales Interneurone GABAergic Révélation experimentale spécifique V-GAT Transporteur vésiculaire du GABA GAD Enzyme de synthèse du GABA (glutamin acid decarboxylase) V-GLUT Transporteur vésiculaire du Glutamate

  5. rs 10-90%, t 10 ms What is a synaptic current ? Whole cell recording sIPSC

  6. What is a synaptic current ? Glu sEPSC

  7. PA Fusion Sans PA Ca 2+ Na+ PA Fusion Sans PA x Ca 2+ x Na+ GABAergic activity glutamatergic activity Spontanés sIPSC sEPSC Miniatures +TTX mIPSC mEPSC

  8. Indications supplementaire Syst-ecto Ab : AC anti synaptotagmin KCL 10-50 mM Stimulation chimique pour depolariser les neurones TTX : Tetrodotoxin Bloque les canaux Na+ dependants APV :100 microM Blocage des recepteurs NMDA actives par le glutamate CNQX :20 microM Blocage des recepteurs AMPA/KA actives par le glutamate Bicuculline : 20 microM Blocage des recepteurs GABAa actives par le GABA Syst-ecto Ab

  9. Pour l’article : Détermination de la concentration intra cytoplasmique de Ca2+ Utilisation d’un colorant sensible au Ca2+ : ex. Magfura, Aequorin J : faible affinité au Ca2+: 10-4 M Mesure de la fluorescence émise après stimulation

  10. Microdomains of high calcium concentration in a presynaptic terminal Quanta stable microdomain Absence de stimulation a Fluorescence image of a presynaptic terminal injected with n-aequorin-J. When the presynaptic fibre is fully loaded, it is continuously stimulated at 10 Hz for 10 s. Adapted from Llinas R, Sugimori M, Silver RB (1992) Science256, 677-679, with permission

  11. Docking : interaction spécifique de différentes protéines Palade, 1970: reconnaissance spécifique entre la membrane vésiculaire et plasmatique Rothman et al. Bases moleculaire de cette interaction specifique Purification des plusieurs proteines essentielles pour les processus de docking et de fusion Fusion : processus dependant de l`ATP et du Ca2+

  12. Adapted from Calakos N, Scheller H (1996) Synaptic vesicle biogenesis, docking and fusion: a molecular description, Physiolog. Rev.76, 1-29, with permission.

  13. Machinerie de la libération

  14. Blocage de l`exocytose par les differentes toxines TeNT: Tetanus neurotoxin BoTNs: Botulinum neurotoxin TeTN et BoTN/B Clivage selectif de R-SnareSynaptobrevin/Vamp BoNT/A ou E ProteolyseQ-SNARE SNAPE 25

  15. Indications supplementaire Fura 2 : Colorant sensible au Ca2+ Ryanodine (1microM) et cyclopiazonic acid (30 microM) Bloquant du recepteur Ryanodine sur RE et de la pompe Ca2+ SERCA TTX : Tetrodotoxin Bloque les canaux Na+ dependants APV :100 microM Blocage des recepteurs NMDA actives par le glutamate CNQX :20 microM Blocage des recepteurs AMPA/KA actives par le glutamate Bicuculline : 20 microM & Picrotoxin Blocage des recepteurs GABAa actives par le GABA

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