Neuropeptide Y (NPY), an endogenous peptide which strongly induces food intake, is demonstrated to have discriminative stimulus properties when administered intracerebroventricularly. Rats rapidly learned to press the appropriate level during training. NPY discrimination was dose-dependent. NPY's discriminative stimulus properties were compared to those of two doses of Peptide YY (PYY) and 24 and 48 h of food deprivation, conditions which also increase feeding. Both doses of PYY generalized to NPY, supporting previous findings that PYY has effects similar to NPY. Although food deprivation increases feeding in a manner similar to NPY, food deprivation did not result in NPY-appropriate responding.
Bibliographical noteFunding Information:
This work was supported by NIDA Grant DA02717 awarded to T.T. and J.C. and NIDA Grant DA03999 awarded to A.L.D.C.J. was supported under NIDA Training Grant DA07097. The authors wish to thank Martha Grace for her expert technical assistance throughout the project.
- Discriminative stimulus
- Drug discrimination
- Food deprivation
- Food intake
- Neuropeptide Y
- Peptide YY