2-imino-thiazolidin-4-one derivatives as potent, orally active S1P1 receptor agonists.
Sphingosine-1-phosphate (S1P) is a widespread lysophospholipid which displays a wealth of biological effects. Extracellular S1P conveys its activity through five specific G-protein coupled receptors numbered S1P(1) through S1P(5). Agonists of the S1P(1) receptor block the egress of T-lymphocytes from thymus and lymphoid organs and hold promise for the oral treatment of autoimmune disorders. Here, we report on the discovery and detailed structure-activity relationships of a novel class of S1P(1) receptor agonists based on the 2-imino-thiazolidin-4-one scaffold. Compound 8bo (ACT-128800) emerged from this series and is a potent, selective, and orally active S1P(1) receptor agonist selected for clinical development. In the rat, maximal reduction of circulating lymphocytes was reached at a dose of 3 mg/kg. The duration of lymphocyte sequestration was dose dependent. At a dose of 100 mg/kg, the effect on lymphocyte counts was fully reversible within less than 36 h. Pharmacokinetic investigation of 8bo in beagle dogs suggests that the compound is suitable for once daily dosing in humans.
Bolli
Martin H
MH
Drug Discovery Chemistry, Actelion Pharmaceuticals Ltd., Allschwil, Switzerland. martin.bolli@actelion.com
Abele
Stefan
S
Binkert
Christoph
C
Bravo
Roberto
R
Buchmann
Stephan
S
Bur
Daniel
D
Gatfield
John
J
Hess
Patrick
P
Kohl
Christopher
C
Mangold
Céline
C
Mathys
Boris
B
Menyhart
Katalin
K
Müller
Claus
C
Nayler
Oliver
O
Scherz
Michael
M
Schmidt
Gunther
G
Sippel
Virginie
V
Steiner
Beat
B
Strasser
Daniel
D
Treiber
Alexander
A
Weller
Thomas
T
D000284:Administration, Oral; D000818:Animals; D002460:Cell Line; D006224:Cricetinae; D003412:Cricetulus; D004285:Dogs; D022781:Hepatocytes / Q000378:metabolism; D057166:High-Throughput Screening Assays; D006801:Humans; D007097:Imines / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology; D018655:Lymphocyte Count; D008297:Male; D008862:Microsomes, Liver / Q000378:metabolism; D011869:Radioligand Assay; D051381:Rats; D017208:Rats, Wistar; D049349:Receptors, Lysosphingolipid / Q000819:agonists*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013844:Thiazoles / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology; D053778:Thiazolidines / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology
D007097:Imines; D049349:Receptors, Lysosphingolipid; D013844:Thiazoles; D053778:Thiazolidines; C550169:ponesimod