GAMMA AND GABA Flashcards
Gamma-aminobutyric acid (GABA)
Primary inhibitory neurotransmitter
Gaba is synthesized from
glutamate
GAD- catalyzes reactions
glutamic acids decarboxylase
Required for synthesize and catalyzing
co-factor pyridoxal phosphate
VIATT
vesicular inhibitory amino acids transporter
GABA is removed via
GAT transporter
GAT transporter aka
Na transporter
GABA is broken down into
succinate
GABA degradation can also produce
gamma-hydroxybutyrate (GHB)
Subunits combine to form
a functional pentameric receptor
most common subunits
2 alpha; 2 beta 1 gamma
Fast GABAg transmission mediated mainly by
GABAb receptors
GABAa receptors are what type of channel
ligand-activated chloride channel
GABA (urgent neurons) are related to
seizuers
GABAb receptors are central to the modulation of
excitatory and inhibitory synaptic activity
GABAb inhibits NT release in terminals through
inhibition of voltage gated Ca channels or hyperpolarizes postsynaptic neurons by activating inwardly rectifying K channels
GABAbR are obligatory
heteromers composed of 1 and 2
R1 binds agonist with
high affinity
R2 mediates coupling to
Galphai
GABA has metatropic receptors that are
primarily inhibitory
glycine is
from NMDA receptor coagonist
glycine responds to
inotropic receptors
ligand-gated ion channels are
super family receptors
homologous to
GABAa
Froms functional
pentameric receptors
idoleamine is synthesized from
tyrptophan
dopamine is used extensively by CNS for
movement coordination, emotion, and reward/ motivation
relatively small pop of DA neurons of
the Substantia Nigra nucleus (SN)
Ventral tegmental area innervates
large portion of cortex (hippocampus and limbic system)
tyrosine converted by
L-DOPA
L-dopa
converted to dopamine
vesicle loading aka
vesicular monoamine transporter
re-uptake
dopamine transporter (DAT)
coke will block
dopamine transporter
D1 family
D1 and D5, excitatory
D2 family
D2-4, inhibitory
D1 family coordination with
glutamate
Downstreaming D1 signaling
enhances NMD