The effects of H-Phe-Ile-Tyr-His-Ser-Tyr-Lys-OH, a hypothalamic heptapeptide with weak CRF activity were investigated on the in vitro uptake and release of radiolabelled dopamine (DA), noradrenaline (NA) and serotonin (5-HT) in rat brain hypothalamic slices. In a doses of 5×10-6 M and 10-5 M the heptapeptide significantly increased the 5-HT uptake, whereas it had no effect on the DA and NA uptakes. The same doses (5×10-6 M, 10-5 M) significantly increased the DA release without affecting the NA and 5-HT release. These results suggest that H-Phe-Ile-Tyr-His-Ser-Tyr-Lys-OH as a hypothalamic peptide is able to modulate selectively the activity of the serotonergic and dopaminergic transmission without influencing the noradrenergic system in the hypothalamus.
ASJC Scopus subject areas
- Endocrine and Autonomic Systems
- Cellular and Molecular Neuroscience