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Neuropeptide Y: a powerful modulator of epithelial ion transport
Author(s) -
Friel David D.,
Miller Richard J.,
Walker Mary W.
Publication year - 1986
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1986.tb10220.x
Subject(s) - neuropeptide y receptor , peptide yy , ileum , ussing chamber , endocrinology , medicine , neuropeptide , chemistry , ion transporter , jejunum , guinea pig , intestinal mucosa , biology , receptor , biochemistry , secretion , membrane
1 Neuropeptide Y (NPY) is a major gut peptide localized in the intestinal mucosa of several mammalian species. Ileal mucosa from rabbit and guinea‐pig was mounted in Ussing chambers in order to study the effect of NPY on short circuit current. 2 Neuropeptide Y inhibited the short circuit current when applied to the serosal side of the tissue. The maximum change in short circuit current was − 50 ± 6 μA cm −2 in the rabbit ileum and − 49 ± 14 μA cm −2 in the guinea‐pig ileum. The EC 50 was 3 × 10 −8 M in both species. 3 Pretreatment of rabbit ileum with the α 2 ‐adrenoceptor antagonist, yohimbine (1 × 10 −6 M) for 10 min did not reduce the response of the tissue to neuropeptide Y (1 × 10 −7 M). 4 When applied serosally to rabbit ileal mucosa, the related peptide YY caused a maximum change in short circuit current of − 60 ± 13 μA cm −2 ; the EC 50 was 2 × 10 −9 M. 5 Isotopic flux studies in rabbit ileum showed that 1 × 10 −7 M neuropeptide Y enhanced mucosal‐toserosal Na + and Cl − fluxes and reduced serosal‐to‐mucosal Cl − flux. 6 Replacement of chloride with gluconate on both sides of the tissue significantly reduced the change in short circuit current produced by neuropeptide Y (1 × 10 −7 M), as did a similar replacement of bicarbonate. 7 It is concluded that neuropeptide Y and peptide YY are the most potent neurotransmitters or hormones so far described in their ability to attenuate electrogenic transport in the small intestine.