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Membrane water permeability related to antigen‐presenting function of dendritic cells

Aquaporin 5 (AQP5) is one of the water channel proteins which participate in a wide array of physiological processes and are primary determinants of membrane osmotic water permeability. The AQP5 gene is located in human chromosome 12q, the same region as the location of the major asthma susceptibility loci. In this study we try to determine whether the AQP5 knock‐out has some effect on allergen‐induced asthma. With a mouse asthma model induced by ovalbumin (OVA), we found that deletion of AQP5 reduced some major characteristic features of asthma, such as less inflammation cell infiltration in lung tissues, lower cytokine expression and fewer inflammation cells in bronchoalveolar lavage fluids compared with those from wild‐type (WT) mice. Because it was found that mice injected intratracheally with OVA‐pulsed dendritic cells (DCs), the AQP5 gene knock‐out (AQP5−/−) ones presented fewer inflammation cells. Because DCs are major antigen‐presenting cells that play an important role in antigen‐induced asthma, we also probed into the possible effect of gene knock‐out on DCs. Surprisingly, reverse transcription–polymerase chain reaction and fluorescence activated cell sorter analysis showed high levels of AQP5 on the surface of DCs from in vivo or bone marrow monocyte‐derived DCs (mDC) in vitro. Immature mDC from AQP5 knock‐out mice (AQP5−/−) showed decreased expression of CD80 and CD86 and endocytosis ability compared with that from WT, but the difference disappeared after mDCs matured with lipopolysaccharide. AQP5‐mediated water transmembrane may play some role in the function of DCs. However, the mechanism of the effect of AQP5 on the DCs' function needs to be investigated further.