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Effect of lafutidine on CGRP release from cultured rat dorsal root ganglion cells

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image of Inflammopharmacology

Lafutidine increased capsaicin-stimulated CGRP release from isolated rat stomach without changing basal CGRP levels. In order to clarify the mechanism of this effect, we used cultured rat DRG cells and measured CGRP release. (1) DRG cells were treated with each drug, and the CGRP content of the supernatant was determined by EIA. (2) RGM-1 cells were co-cultured with DRG cells through a cell culture insert, and capsaicin-evoked CGRP release from the DRG cells was determined when lafutidine or PGE2 was added to the RGM-1 cells. (3) The supernatant of isolated rat stomach incubated with lafutidine was added to cultured DRG cells, and capsaicin-evoked CGRP release was determined. PGE2, but not lafutidine, augmented capsaicin-evoked CGRP release from DRG cells. Lafutidine did not modulate CGRP release from DRG cells, even though it sensitized CGRP-containing afferent nerves in the rat stomach. Lafutidne and PGE2 may have different mechanisms of sensitization.


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