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Adenosine
receptor A2a
Adenosine
receptor A2a
Gamma-
aminobutyric
acid receptor
subunit alpha-1
Gamma-
aminobutyric
acid receptor
subunit beta-2
Gamma-
aminobutyric
acid receptor
subunit gamma-2
Alpha-1A
adrenergic
receptor
Histamine H1
receptor
Gamma-
aminobutyric
acid receptor
subunit alpha-1
Gamma-
aminobutyric
acid receptor
subunit beta-2
Gamma-
aminobutyric
acid receptor
subunit gamma-2
Orexin
Orexin receptor
type 2
Gamma-
aminobutyric
acid receptor
subunit beta-2
Gamma-
aminobutyric
acid receptor
subunit gamma-2
Gamma-
aminobutyric
acid receptor
subunit alpha-1
Gamma-
aminobutyric
acid receptor
subunit beta-2
Gamma-
aminobutyric
acid receptor
subunit gamma-2
Vesicular
inhibitory
amino acid
transporter
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-1
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Voltage-
dependent
L-type calcium
channel subunit
alpha-1C
Glutamate
decarboxylase 1
Gamma-
aminobutyric
acid receptor
subunit alpha-1
Caffeine
Caffeine
Adenosine
γ-Aminobutyric acid
Norepinephrine
Histamine
Ca
+
γ-Aminobutyric acid
γ-Aminobutyric acid
γ-Aminobutyric acid
Ca
+
L-Glutamic acid
CO
2
Pyridoxal
5'-phosphate
Sleep
Arousal
Arousal
Arousal
Depolarization
Hyperpolarization
Locus Coeruleus
Lateral Hypothalamus
Nucleus accumbens
Dendrite
Axon Terminal
Cytosol
Cytosol
Postsynaptic Neuron
Cytosol
Ventrolateral Preoptic
Nucleus
Tuberomammillary Nucleus
Cytosol
Postsynaptic Neuron
Cytosol
Postsynaptic Neuron
Caffeine antagnoizes the
adenosine A2A receptors in
the nucleus accumbens which
prevents depolarization of
the neuron.
GABA cannot be released from
the neuron due to the
antagonism of adenosine A2A
receptors which prevents
depolarization of the
neuron.
The arousal promoting areas
of the brain (Locus
coeruleus, lateral
hypothalamus, and the
tuberomammillary nucleus)
inhibits the ventrolateral
preoptic nuclues in a
flip-flop arrangement via
GABA
The low concentration of
GABA cannot activate the
GABAA receptors which cause
hyperpolarization of the
neurons. The inhibition of
GABA removes the restraints
on the neurons of the
tuberomammillary nucleus,
the lateral hypothalmus, and
the locus coeruleus
Orexin receptors activate
arousal which leads to
wakefulness and alertness.
GABA receptors cause
hyperpolarization of the
neurons which further
inhibits the activation of
sleep mechanisms.
Caffeine increases
norepinephrine concentration
in the locus coeruleus
through an unknown
mechanism. Norepinephrine
activates alpha and beta
adrenergic receptors
The activation of adrenergic
receptors and the removal of
the restraints via GABAA
receptors leads to an
increase in arousal which
promotes wakefulness and
alertness.
Histamine H1 receptors
activate arousal mechanisms
in the brain which promote
wakefulness. It stimulates
many other areas of the
brain to further the effects
of wakefulness and
alertness.
Orexin is released through
innervation by glutamate via
the dorsomedial
hypothalamus.
Caffeine inhibits adenosine
A2A receptors which
regularly promote sleep.
This further inhibits sleep
mechanisms in the brain.
Increased arousal in the
locus coeruleus, lateral
hypothalamus, and the
tubermammillary nucleus
inhibits the sleep
mechanisms of the
ventrolateral preoptic
nucleus
ADORA2A
ADORA2A
GABRA1
GABRB2
GABRG2
ADRA1A
HRH1
GABRA1
GABRB2
GABRG2
HCRT
HCRTR2
GABRB2
GABRG2
GABRA1
GABRB2
GABRG2
SLC32A1
CACNA2D1
CACNB1
CACNA1C
GAD1
GABRA1
Caffeine
Caffeine
Adenosine
γ-Aminobutyric
acid
Norepinephrine
Histamine
Calcium
γ-Aminobutyric
acid
γ-Aminobutyric
acid
γ-Aminobutyric
acid
Calcium
L-Glutamic acid
Carbon dioxide
Sleep
Arousal
Arousal
Arousal
Depolarization
Hyperpolarization