Passive Transport of Glycerol into Cell by Aquaporin-9 Aquaporin-9 (AQP9) passively transports water, glycerol, urea, and some other small neutral solutes across the plasma membrane according to the osmotic gradient. AQP9 is expressed in the sinusoidal plasma membrane in the liver facing the portal vein where it is believed to be responsible for glycerol uptake as part of gluconeogenesis. AQP9 is also expressed in glia, neurons, and peripheral leukocytes. Authored: May, B, 2009-08-06 Edited: May, B, 2009-08-06 Pubmed10564231 Pubmed11027599 Pubmed17961083 Pubmed18762715 Pubmed19590626 Reactome Database ID Release 43432049 Reactome, http://www.reactome.org ReactomeREACT_23966 Reviewed: Beitz, E, 2010-06-24 Reviewed: Calamita, G, 2010-07-15 Reviewed: Mathai, JC, MacIver, B, 2010-07-31