3 research outputs found
Potent and Selective Agonists of Sphingosine 1‑Phosphate 1 (S1P<sub>1</sub>): Discovery and SAR of a Novel Isoxazole Based Series
Sphingosine 1-phosphate (S1P) is
the endogenous ligand for the
sphingosine 1-phosphate receptors (S1P<sub>1–5</sub>) and evokes
a variety of cellular responses through their stimulation. The interaction
of S1P with the S1P receptors plays a fundamental physiological role
in a number of processes including vascular development and stabilization,
lymphocyte migration, and proliferation. Agonism of S1P<sub>1</sub>, in particular, has been shown to play a significant role in lymphocyte
trafficking from the thymus and secondary lymphoid organs, resulting
in immunosuppression. This article will detail the discovery and SAR
of a potent and selective series of isoxazole based full agonists
of S1P<sub>1</sub>. Isoxazole <b>6d</b> demonstrated impressive
efficacy when administered orally in a rat model of arthritis and
in a mouse experimental autoimmune encephalomyelitis (EAE) model of
multiple sclerosis
Discovery and Structure–Activity Relationship (SAR) of a Series of Ethanolamine-Based Direct-Acting Agonists of Sphingosine-1-phosphate (S1P<sub>1</sub>)
Sphingosine-1-phosphate
(S1P) is a bioactive sphingolipid metabolite
that regulates a multitude of physiological processes such as lymphocyte
trafficking, cardiac function, vascular development, and inflammation.
Because of the ability of S1P<sub>1</sub> receptor agonists to suppress
lymphocyte egress, they have great potential as therapeutic agents
in a variety of autoimmune diseases. In this article, the discovery
of selective, direct acting S1P<sub>1</sub> agonists utilizing an
ethanolamine scaffold containing a terminal carboxylic acid is described.
Potent S1P<sub>1</sub> agonists such as compounds <b>18a</b> and <b>19a</b> which have greater than 1000-fold selectivity
over S1P<sub>3</sub> are described. These compounds efficiently reduce
blood lymphocyte counts in rats through 24 h after single doses of
1 and 0.3 mpk, respectively. Pharmacodynamic properties of both compounds
are discussed. Compound <b>19a</b> was further studied in two
preclinical models of disease, exhibiting good efficacy in both the
rat adjuvant arthritis model (AA) and the mouse experimental autoimmune
encephalomyelitis model (EAE)
Small Molecule Reversible Inhibitors of Bruton’s Tyrosine Kinase (BTK): Structure–Activity Relationships Leading to the Identification of 7‑(2-Hydroxypropan-2-yl)-4-[2-methyl-3-(4-oxo-3,4-dihydroquinazolin-3-yl)phenyl]‑9<i>H</i>‑carbazole-1-carboxamide (BMS-935177)
Bruton’s
tyrosine kinase (BTK) belongs to the TEC family of nonreceptor tyrosine
kinases and plays a critical role in multiple cell types responsible
for numerous autoimmune diseases. This article will detail the structure–activity
relationships (SARs) leading to a novel second generation series of
potent and selective reversible carbazole inhibitors of BTK. With
an excellent pharmacokinetic profile as well as demonstrated in vivo activity and an acceptable
safety profile, 7-(2-hydroxypropan-2-yl)-4-[2-methyl-3-(4-oxo-3,4-dihydroÂquinazolin-3-yl)Âphenyl]-9<i>H</i>-carbazole-1-carboxamide <b>6</b> (BMS-935177) was
selected to advance into clinical development