Pyr-Leu-Tyr-Glu-Asn-Lys-Pro-Arg-Arg-Pro-D-Trp-Ile-Leu-OH

[D-Trp11]-Neurotensin, an analogue of Neurotensin (NT), is a selective antagonist of NT in perfused rat hearts but behaves as a full agonist in guinea pig atria and rat stomach strips. [D-Trp11]-Neurotensin can inhibit NT-induced hypotension[1][2].

[1] Quirion R, et, al. Selective blockade of neurotensin-induced coronary vessel constriction in perfused rat hearts by a neurotensin analogue. Eur J Pharmacol. 1980 Feb 8;61(3):309-12. DOI:10.1016/0014-2999(80)90133-8
[2] Quirion R, et, al. Hypotensive effects of centrally and peripherally administered neurotensin and neurotensin derivatives in rats. Neuropeptides. 1981 Jou. 1(4): 253-9.