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l�ll Role and regulation of TRP channels in neutrophil granulocytes Heiner I; Eisfeld J; Luckhoff ACell Calcium 2003[May]; 33 (5-6): 533-40Members of the transient receptor potential (TRP) family for which mRNA can be demonstrated in neutrophil granulocytes with RT-PCR include TRPC6 (as only "short" TRP), TRPM2, TRPV1, TRPV2, TRPV5 and TRPV6. When these are analyzed in heterologous overexpression experiments, TRPM2 is the only cation channel with characteristic properties that can be used as fingerprint to provide functional evidence for its expression in neutrophil granulocytes. As cells transfected with TRPM2, neutrophil granulocytes display non-selective cation currents and typical channel activity evoked by intracellular ADP-ribose and NAD. Thus, stimulation of TRPM2 is likely to occur after activation of CD38 (producing ADP-ribose) and during the oxidative burst (enhancing the NAD concentration). This novel mode of cation entry regulation may be of particular importance for the response of granulocytes to chemoattractants. TRPV6 is a likely but not exclusive candidate as subunit of the channels mediating store-operated Ca2+ entry (SOCE). Evidence for SOCE in granulocytes has been presented with the fura-2 technique but not with electrophysiological methods although Ca2+-selective store-operated currents can be demonstrated in HL-60 cells, a cell culture model of neutrophil granulocytes.|Adenosine Diphosphate Ribose/pharmacology[MESH]|Animals[MESH]|Calcium Channels/*metabolism[MESH]|Granulocytes/drug effects/*metabolism[MESH]|Humans[MESH]|Hydrogen Peroxide/pharmacology[MESH]|NAD/pharmacology[MESH]|Neutrophils/drug effects/*metabolism[MESH]|Oxidants/pharmacology[MESH]|Signal Transduction[MESH]|TRPC Cation Channels[MESH] |