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Indolamines and the Serotonin Neurotransmitter System Study Guide

Explore the fundamental mechanisms of synaptic transmission, differentiating between ionotropic and metabotropic receptors. Understand G-protein signaling, second messenger cascades, and the pharmacological tools used to study neurotransmitter systems. This guide covers the molecular basis of how neurons communicate and how drugs interact with these systems.

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Principles of Neurotransmitter Systems and Synaptic Transmission

Neurotransmitter Systems and Receptor Subtypes

Neurotransmitter systems involve synaptic transmission through ionotropic and metabotropic receptors that exert post-synaptic effects via ligand binding and G-protein signaling.

  • Synaptic transmission
  • Ionotropic receptors
  • Metabotropic receptors
  • G-proteins
  • Second messenger cascade
  • Ligand binding sites
  • Subunit structure
  • Agonists and antagonists
  • Signal amplification
  • Pharmacological analysis

Neurotransmitter Systems Identification and Distribution

Neurotransmitter systems include molecular machinery responsible for transmitter synthesis, vesicular packaging, reuptake, degradation, and pre/postsynaptic action.

  • Synaptic transmission
  • Neurotransmitter criteria
  • Immunocytochemistry
  • In situ hybridization
  • Transmitter release
  • Synaptic mimicry
  • Microiontophoresis
  • Pressure ejection
  • Degradation
  • Reuptake
  • Diffusion

Classification and Functions of Neurotransmitter Systems

Neurotransmitters are classified as small or large molecules including amino acids, biogenic amines, and neuropeptides that regulate functions in the CNS and PNS.

  • Acetylcholine
  • Amino acid neurotransmitters
  • Glutamate
  • Biogenic amines
  • Catecholamines
  • Dopamine
  • Norepinephrine
  • Epinephrine
  • Indolamines
  • Serotonin
  • Histamine
  • Neuropeptides
  • Excitatory neurotransmitters
  • Inhibitory neurotransmitters
  • Synaptic plasticity

Principles of Electrical and Chemical Synaptic Transmission

Communication in the nervous system occurs via electrical synapses through gap junctions or chemical synapses using neurotransmitters released from presynaptic terminals.

  • Electrical synapses
  • Chemical synapses
  • Neurotransmitters
  • Presynaptic terminals
  • Postsynaptic membrane
  • Synaptic cleft
  • Ephaptic transmission
  • Gas-transmission
  • Nitric oxide
  • Synaptic efficiency
  • Synaptic plasticity
  • Synaptic delay

Neurotransmitter Types and Synaptic Transmission

Small and large neurotransmitters undergo synthesis, transport, storage, and release via exocytosis to activate ionotropic or metabotropic receptors.

  • Small neurotransmitters
  • Large neurotransmitters
  • Neuropeptides
  • Neurotransmitter synthesis, transport, and storage
  • Exocytosis
  • Calcium-dependent vesicle docking
  • SNARE proteins
  • Ligand-receptor binding
  • Ionotropic receptors
  • Metabotropic receptors
  • Autoreceptors
  • Termination of transmission
  • Re-uptake
  • Enzymatic degradation
  • Diffusion
  • Scavenging

Synaptic Transmission and Synaptic Potentials

Neurotransmitters released by pre-synaptic terminals bind to ionotropic or metabotropic receptors to elicit postsynaptic potentials.

  • Neurotransmitter
  • Ionotropic receptors
  • Metabotropic receptors
  • G proteins
  • Second messenger
  • Postsynaptic potentials
  • Excitatory postsynaptic potential (EPSP)
  • Inhibitory postsynaptic potential (IPSP)
  • Shunting
  • Reversal potential
  • Equilibrium potential
  • Nicotinic acetylcholine receptors
  • Glutamate receptors
  • AMPA channel
  • NMDA receptor

Neurophysiology of Membrane Potentials and Action Potentials

Neurophysiology of Membrane Potentials and Ion Channels

Living cells maintain an electrical potential across membranes using ion channels, phospholipid bilayers, and concentration gradients.

  • Resting Potential
  • Membrane Voltage (Vm)
  • Ion channels
  • Protein structure levels
  • Gated channels
  • Diffusion
  • Concentration gradient

Action Potential Propagation and Cable Properties

Depolarization spreads via electrotonic flow and is affected by membrane cable properties including cytoplasmic conductance, membrane conductance, and membrane capacitance.

  • Electrotonic flow
  • Cytoplasmic conductance
  • Membrane conductance
  • Membrane capacitance
  • Length constant
  • Time constant
  • Nerve conduction velocity
  • Myelination
  • Saltatory conduction
  • Nodes of Ranvier
  • Voltage-gated sodium channels
  • Voltage-gated potassium channels

Neurophysiology of Membrane Electrical Properties and Ion Gradients

The electrical properties of membranes and ion flow are determined by the magnitude and direction of concentration and electrical gradients, equilibrium potentials, and the physical and chemical properties of the lipid bilayer and ion channel proteins.

  • Concentration gradient
  • Chemical equilibrium
  • Electrical gradient
  • Ion channels
  • Voltage difference
  • Equilibrium potential
  • Potassium efflux
  • Membrane potential
  • Electrical properties of membranes
  • Ion channel proteins
  • Nernst Equation
  • Ionic driving force
  • Membrane capacitance
  • Relative permeability
  • Leakage currents
  • Ion pumps
  • Active transport
  • Sodium-potassium pumps

Mechanisms of Synaptic Transmission and Integration

This content explores how inhibitory transmitters like glycine and GABA, graded postsynaptic potentials, and electrotonic propagation facilitate synaptic integration and plasticity.

  • Inhibition
  • GABA receptors
  • Shunting inhibition
  • Postsynaptic potentials (PSPs)
  • Electrotonic propagation
  • Length constant
  • Time constant
  • Synaptic integration
  • Temporal summation
  • Spatial summation
  • Synaptic plasticity
  • Long-term potentiation (LTP)
  • Long-term depression (LTD)

Molecular Basis, Generation, and Propagation of Action Potentials

Action potentials are all-or-nothing, self-regenerating events resulting from the differential activation of voltage-gated sodium and potassium channels across excitable membranes.

  • Action potential phases
  • Voltage-gated sodium channels
  • Voltage-gated potassium channels
  • Refractory periods
  • Selectivity filter
  • Voltage sensor
  • Conformational change
  • Ball and chain model
  • Inactivation and de-inactivation
  • Hyperpolarizing afterpotential
  • Action potential propagation
  • Spike initiation zone
  • Action potentials
  • Excitable membranes
  • Voltage-gated ion channels
  • All-or-nothing event
  • Resting membrane potential
  • Threshold
  • Rising phase
  • Falling phase

Action Potentials and Refractory Periods

Action potentials are all-or-nothing events involving differential activation of voltage-gated sodium and potassium channels and refractory periods that affect firing rates.

  • Action potential
  • Absolute refractory period
  • Relative refractory period
  • Voltage-gated sodium channels
  • Voltage-gated potassium channels
  • Stimulus strength
  • Firing rate
  • Graded potentials
  • Membrane potential
  • Afterpotential

Indolamines and Serotonin Neurotransmission

Indolamines and Serotonin Neurotransmitter Systems

Serotonin is found in the gastrointestinal tract and the central nervous system, where it regulates mood, appetite, and various neurotrophic processes.

  • Indolamines
  • Serotonin
  • Raphe nuclei
  • Metabotropic receptors
  • 5-HT receptors
  • Hypothalamus
  • Neurotrophic processes

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