Abstract：
:CS-0777 is a selective sphingosine 1-phosphate receptor-1 (S1P(1)) modulator under development for treatment of autoimmune conditions. A randomized, double-blind, placebo-controlled study was conducted to assess the safety, tolerability, pharmacokinetics, and pharmacodynamics of single oral doses of CS-0777 in escalating dose cohorts of healthy male participants (0.1, 0.3, 1.0, and 2.5 mg; 6 active, 2 placebo per cohort). Primary pharmacodynamic parameters were absolute lymphocyte counts and lymphocyte subsets (CD4 and CD8 T and B cells). CS-0777 resulted in a pronounced, dose-dependent decrease in absolute lymphocyte counts (mean percent decrease from baseline at 24 hours postdose: 7%, 26%, 52%, 79%, and 85%, for placebo and 0.1, 0.3, 1.0, and 2.5 mg, respectively). Dose-related decreases of similar magnitude were observed for T and B cell subsets. Mean total white blood cell and neutrophil counts remained within normal ranges for all dose levels. CS-0777 was well tolerated, and there were no serious or severe adverse events. Mild, asymptomatic bradycardia and transaminase elevations (<3-fold upper limit of normal), similar to findings for other S1P receptor modulators, were observed at the highest dose level (2.5 mg). Therefore, CS-0777 shows potent activity in humans and may hold potential for treatment of autoimmune conditions such as multiple sclerosis.
journal_name
J Clin Pharmacoljournal_title
Journal of clinical pharmacologyauthors
Moberly JB,Rohatagi S,Zahir H,Hsu C,Noveck RJ,Truitt KEdoi
10.1177/0091270011408728subject
Has Abstractpub_date
2012-07-01 00:00:00pages
996-1006issue
7eissn
0091-2700issn
1552-4604pii
0091270011408728journal_volume
52pub_type
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