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Chromaffin
granule amine
transporter
Sodium-
dependent
serotonin
transporter
Trace amine-
associated
receptor 1
Sodium-
dependent
serotonin
transporter
Trace amine-
associated
receptor 1
5-
hydroxytryptamine
receptor 2A
Sodium-
dependent
serotonin
transporter
Amine oxidase
[flavin-
containing] A
Synaptic
vesicular amine
transporter
Sodium-
dependent
serotonin
transporter
Aromatic-L-
amino-acid
decarboxylase
Tryptophan
5-hydroxylase 1
Methamphetamine
Methamphetamine
Methamphetamine
Methamphetamine
Serotonin
Serotonin
Serotonin
Serotonin
Methamphetamine
Methamphetamine
5-Hydroxy-L-
tryptophan
CO
2
L-Tryptophan
Tetrahydrobiopterin
O
2
4a-
Hydroxytetrahydrobiopterin
H
2
O
O
2
5-
Hydroxyindoleacetic
acid
H
2
O
2
NH
3
FAD
Pyridoxal
5'-phosphate
Intestinal
Serotonin
pathway
Gq Signalling
cascade
Fe2+
Serotonin
Internalization
Synaptic Vesicle
Methamphetamine activates
Trace amine-associated
receptors which causes
internalization of serotonin
reuptake transporters. This
prevents the reuptake of
serotonin from the synapse.
Serotonin accumulates in the
synapse from the reversal
and inhibition of serotonin
transporters.
Presynaptic Neuron
Intestine Smooth Muscle
Methamphetamine enters the
synaptic vesicles through
VMAT2 and inhibits VMAT2 and
displaces the norepinephrine
in the vesicles causing
serotonin to spew out into
the cytosol
Serotonin is produced in the
raphe nuclei and then stored
in presynaptic vesicles
Methamphetamine enters the
nerve terminal via the
serotonin reuptake
transporter or by diffusing
through the membrane
Methamphetamine inhibits
sodium-dependent serotonin
receptors, by being a
negative modulator. This
prevents the reuptake of
serotonin from the synapse.
Cytosol
In high doses
methamphetamine inhibits
Amine oxidase [flavin
containing] A. The
inhibition of MAO A which
prevents the metabolic
degradation of serotonin,
and therefore increases the
concentration of serotonin
in the cytosol.
Reversal of transport
The high concentration of
serotonin activates
5-hydroxytryptamine receptor
2A, 3A, and 3B which are
mainly located in the
gastrointestinal tract. Here
it contracts smooth muscles
causing food and toxins to
pass through the intestine
more quickly.
The high concentration of
serotonin activates
5-hydroxytryptamine receptor
2A, 3A, and 3B in the brain
where the exact mechanisms
are unknown. It is suspected
to influence mood,
perception, and cognition.
Mood
Postsynaptic Neuron
The function of Trace
amine-associated receptors
with serotonin has only been
observed in mRNA expression.
Perception
Cognition
Diffusion
SLC18A1
SLC6A4
TAAR1
SLC6A4
TAAR1
HTR2A
SLC6A4
MAOA
SLC18A2
SLC6A4
DDC
TPH1
Methamphetamine
Methamphetamine
Methamphetamine
Methamphetamine
Serotonin
Serotonin
Serotonin
Serotonin
Methamphetamine
Methamphetamine
5-Hydroxy-L-
tryptophan
Carbon dioxide
L-Tryptophan
Tetrahydrobiopterin
Oxygen
4a-
Hydroxytetrahydrobiopterin
Water
Oxygen
5-
Hydroxyindoleacetic
acid
Hydrogen
peroxide
Ammonia
Intestinal
Serotonin
pathway
Gq Signalling
cascade
SLC18A1
SLC6A4
TAAR1
SLC6A4
TAAR1
HTR2A
SLC6A4
MAOA
SLC18A2
SLC6A4
DDC
TPH1
Ice
Ice
Ice
Ice
5-HT
5-HT
5-HT
5-HT
Ice
Ice
5-HTP