p-ethynylphenylalanine: a potent inhibitor of tryptophan hydroxylase.
Tryptophan hydroxylase (TPH) is the initial and rate-limiting enzyme in serotonin biosynthesis. The enzyme activity is dependent on molecular oxygen, a tetrahydropterin cosubstrate, and ferrous iron. The present study demonstrates that TPH is inhibited by a novel compound, p-ethynylphenylalanine (pEPA), produced by the Heck reaction of trimethylsilylacetylene with N-tertbutyloxycarbonyl-4-iodo-L-phenylalanine methyl ester. pEPA is a more potent and specific inhibitor of TPH than p-chlorophenylalanine (pCPA). In the present study, pEPA was demonstrated to inhibit competitively and reversibly TPH in vitro (Ki = 32.6 +/- 6.2 microM vs. tryptophan). pEPA displayed little inhibitory activity toward tyrosine hydroxylase (EC 1.14.16.2), the initial and rate-limiting enzyme for catecholamine biosynthesis, and no inhibition of phenylalanine hydroxylase or tyrosinase. In addition, pEPA was a poor ligand for the serotonin transporter and several serotonin receptors. Administration of pEPA (30 mg/kg) to rats produced a 95 +/- 5% decrease in TPH activity in brain homogenates and a concomitant decrease in serotonin and 5-hydroxyindole-3-acetic acid levels (85%) at 24 h after injection. In contrast, pCPA produced a similar effect (87 +/- 5% decrease in TPH activity) only at 10 times the concentration (300 mg/kg). These results suggest that pEPA is a selective, reversible, and potent inhibitor of TPH both in vitro and in vivo. The potential for pEPA to inhibit selectively and reversibly the biosynthesis of serotonin may contribute to the characterization of the role of serotonin in behavioral and physiological activities.
Stokes
A H
AH
Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157-1083, USA.
Xu
Y
Y
Daunais
J A
JA
Tamir
H
H
Gershon
M D
MD
Butkerait
P
P
Kayser
B
B
Altman
J
J
Beck
W
W
Vrana
K E
KE
D000409:Alanine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D001921:Brain / Q000201:enzymology / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D010134:Fenclonine / Q000494:pharmacology; D006801:Humans; D006897:Hydroxyindoleacetic Acid / Q000037:antagonists & inhibitors / Q000378:metabolism; D007231:Infant, Newborn; D007700:Kinetics; D008297:Male; D011817:Rabbits; D051381:Rats; D011916:Rats, Inbred F344; D017207:Rats, Sprague-Dawley; D011994:Recombinant Proteins / Q000037:antagonists & inhibitors; D012701:Serotonin / Q000378:metabolism; D012702:Serotonin Antagonists / Q000494:pharmacology; D014365:Tryptophan Hydroxylase / Q000037:antagonists & inhibitors*; D014446:Tyrosine 3-Monooxygenase / Q000037:antagonists & inhibitors
D004791:Enzyme Inhibitors; D011994:Recombinant Proteins; D012702:Serotonin Antagonists; C408243:p-ethynylphenylalanine; D012701:Serotonin; D006897:Hydroxyindoleacetic Acid; D014446:Tyrosine 3-Monooxygenase; D014365:Tryptophan Hydroxylase; D000409:Alanine; D010134:Fenclonine