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Homovanillic
acid
transporter
3,4-
Dihydroxyphenylacetic
acid
transporter
Hydroxytyrosol
transporter
Dopamine
4-sulfate
transporter
Epinephrine
transporter
Dopamine
3-O-sulfate
transporter
Dopamine-3-O-
glucuronide
transporter
Homovanillic
acid
transporter
Dopamine-4-O-
glucuronid
transporter
4-(2-
Aminoethyl)- 2-
methoxyphenol
transporter
Levodopa
transporter
Monocarboxylate
transporter 10
Neutral and
basic amino
acid transport
protein rBAT
B(0,+)-type
amino acid
transporter 1
Catechol O-
methyltransferase
Aromatic-L-
amino-acid
decarboxylase
Catechol O-
methyltransferase
Amine oxidase
[flavin-
containing] A
Aldehyde
dehydrogenase,
dimeric
NADP-preferring
Dopamine beta-
hydroxylase
Amine oxidase
[flavin-
containing] A
Aldehyde
dehydrogenase,
dimeric
NADP-preferring
Catechol O-
methyltransferase
Alcohol
dehydrogenase
[NADP(+)]
Sulfotransferase
1A1
Sulfotransferase
1A1
Phenylethanolamine
N-
methyltransferase
UDP-
glucuronosyltransferase
1-9
UDP-
glucuronosyltransferase
1-9
4-(2-
Aminoethyl)- 2-
methoxyphenol
Dopamine-4-O-
glucuronide
Dopamine-3-O-
glucuronide
Homovanillic
acid
Hydroxytyrosol
3,4-
Dihydroxyphenylacetic
acid
Dopamine
4-sulfate
Epinephrine
Dopamine
3-O-sulfate
Homovanillic
acid
Homovanillic
acid
3,4-
Dihydroxyphenylacetic
acid
Hydroxytyrosol
Dopamine
4-sulfate
Epinephrine
Dopamine
3-O-sulfate
Dopamine-3-O-
glucuronide
Homovanillic
acid
Dopamine-4-O-
glucuronide
4-(2-
Aminoethyl)- 2-
methoxyphenol
L-Dopa
L-Dopa
L-Dopa
L-Dopa
L-Dopa
L-Dopa
S-
Adenosylmethionine
S-
Adenosylhomocysteine
H
+
Dopamine
CO
2
S-
Adenosylmethionine
3-
Methoxytyramine
H
+
S-
Adenosylhomocysteine
H
2
O
O
2
Homovanillin
H
2
O
2
NH
3
NAD
H
2
O
H
+
NADH
Ascorbic acid
O
2
Norepinephrine
Dehydroascorbic
acid
H
2
O
H
2
O
O
2
3,4-
Dihydroxyphenylacetaldehyde
NH
3
H
2
O
2
H
2
O
NAD
NADH
H
+
S-
Adenosylmethionine
S-
Adenosylhomocysteine
H
+
NADPH
H
+
NADP
Phosphoadenosine
phosphosulfate
Adenosine
3',5'-
diphosphate
H
+
Phosphoadenosine
phosphosulfate
Adenosine
3',5'-
diphosphate
H
+
S-
Adenosylmethionine
S-
Adenosylhomocysteine
Uridine
diphosphate
glucuronic acid
H
+
Uridine
5'-diphosphate
Uridine
diphosphate
glucuronic acid
H
+
Uridine
5'-diphosphate
FAD
Magnesium
Excretion
Magnesium
Pyridoxal
5'-phosphate
FAD
Copper
Magnesium
L-dopa is taken orally and
absorbed in the intestine
Once levodopa is converted
to dopamine, it is converted
to sulfated or
glucuronidated metabolites,
epinephrine E, or
homovanillic acid
The primary metabolites are
3,4-dihydroxyphenylacetic
acid (13-47%) and
homovanillic acid (23-39%)
Intestinal Epithelial Cell
Cytosol
Hepatocyte