FTY720/fingolimod increases NPC1 and NPC2 expression and reduces cholesterol and sphingolipid accumulation in Niemann-Pick type C mutant fibroblasts by Newton, J, Hait, N, Maceyka, M, Colaco, A, Maczis, M, Wassif, C, Cougnoux, A, Porter, F, Milstien, S, Platt, N, Platt, F, Spiegel, S