Fluorescence-Based Assay: Chinese hamster ovary (CHO) cells overexpressing the human S1P2 gene were cultured in a Ham's F12 medium containing 10% fetal bovine serum (FBS), an antibiotic/antifungal agent and G418. CHO cells overexpressing the rat S1P2 gene were cultured in a Ham's F12 medium containing 10% FBS, penicillin/streptomycin and blasticidin S. The cultured cells were incubated in a Fura2-AM solution (5 uM) [a Ham's F12 medium containing FBS (10%), HEPES buffer (20 mM, pH 7.2 to 7.5) and probenecid (2.5 mM)] at 37 C. for 60 minutes. The cells were washed twice with a Hanks' balanced saline containing HEPES buffer (20 mM, pH 7.2 to 7.5) and probenecid (2.5 mM) and immersed in the same solution. A plate was mounted on a fluorescence-based drug screening system and the intracellular calcium ion concentration was measured for 30 seconds without stimulation.
Fluorescence-Based Assay: Chinese hamster ovary (CHO) cells overexpressing the human S1P2 gene were cultured in a Ham's F12 medium containing 10% fetal bovine serum (FBS), an antibiotic/antifungal agent and G418. CHO cells overexpressing the rat S1P2 gene were cultured in a Ham's F12 medium containing 10% FBS, penicillin/streptomycin and blasticidin S. The cultured cells were incubated in a Fura2-AM solution (5 uM) [a Ham's F12 medium containing FBS (10%), HEPES buffer (20 mM, pH 7.2 to 7.5) and probenecid (2.5 mM)] at 37 C. for 60 minutes. The cells were washed twice with a Hanks' balanced saline containing HEPES buffer (20 mM, pH 7.2 to 7.5) and probenecid (2.5 mM) and immersed in the same solution. A plate was mounted on a fluorescence-based drug screening system and the intracellular calcium ion concentration was measured for 30 seconds without stimulation.
Antagonist activity at S1P2 receptor (unknown origin) expressed in CHO cells assessed as inhibition of S1P-induced increase in intracellular calcium ion concentration by Fura-2AM based fluorescence analysis