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Another strategy to modulate the immune system is to block S1P transport. This study tests the hypothesis that blockers of S1P transport (STBs) mediated by Spinster homologue 2 (Spns2) approximate the efficacy of SRMs without their adverse events.<\/jats:p><\/jats:sec><jats:sec><jats:title>Experimental Approach<\/jats:title><jats:p>We have discovered and optimized STBs to enable investigations of S1P biology and to determine whether S1P transport is a valid drug target. The STB SLF80821178 was administered to rodents to assess its efficacy in a multiple sclerosis model and to test for toxicities associated with SRMs or Spns2\u2010deficient mice. Further, potential biomarkers of STBs, absolute lymphocyte counts (ALCs) in blood and S1P concentrations in plasma and lymph, were measured.<\/jats:p><\/jats:sec><jats:sec><jats:title>Key Results<\/jats:title><jats:p>SLF80821178 resembles SRMs in that it is efficacious in a standard multiple sclerosis model but does not evoke bradycardia or lung leakage, common to the SRM drug class. Also, chronic SLF80821178 administration does not affect auditory responses in adult mice despite the neurosensorial hearing defect observed in Spns2\u2010null mice. While both SRM and STB administration decrease ALCs, the maximal effect is less with an STB (45% vs. 90%). STBs have minimal effects on S1P concentration in plasma or thoracic duct lymph.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion and Implications<\/jats:title><jats:p>We found nothing to invalidate Spns2\u2010dependent S1P transport as a drug target. Indeed, STBs could be superior to SRMs as a therapy to modulate immune system function.<\/jats:p><\/jats:sec>","DOI":"10.1111\/bph.17456","type":"journal-article","created":{"date-parts":[[2025,2,3]],"date-time":"2025-02-03T01:04:11Z","timestamp":1738544651000},"page":"2014-2030","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Assessment of Spinster homologue 2 (Spns2)\u2010dependent transport of sphingosine\u20101\u2010phosphate as a therapeutic target"],"prefix":"10.1111","volume":"182","author":[{"given":"Yugesh","family":"Kharel","sequence":"first","affiliation":[{"name":"Department of Pharmacology University of Virginia  Charlottesville Virginia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tao","family":"Huang","sequence":"additional","affiliation":[{"name":"Department of Pharmacology University of Virginia  Charlottesville Virginia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyle","family":"Dunnavant","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Virginia Tech Center for Drug Discovery Virginia Tech  Blacksburg Virginia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Foster","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Virginia Tech Center for Drug Discovery Virginia Tech  Blacksburg Virginia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"George M. 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