A-18-F-NH2

Neuropeptide AF (cattle), an amidated octadecapeptide, is RFamide neuropeptide. Neuropeptide AF (cattle) acts as a ligand of Mas-related gene receptor A4 (MrgprA4) (Mas-related G-protein-coupled Receptor (MRGPR)) (EC50 of ~60 nM) and MrgprC11 (EC50 of ~300 nM). Neuropeptide AF (cattle) also activate to the G protein-coupled receptors NPFF1 (Neuropeptide Y Receptor) (EC50 of ~25-325 nM) and NPFF2 (EC50 of ~1-5 nM). Neuropeptide AF (cattle) shows anti-opiate and related pain modulation effects[1][2].

[1] Nada Abdellah, et al. Neuropeptide AF Induces Piecemeal Degranulation in Murine Mucosal Mast Cells: A New Mediator in Neuro-Immune Communication in the Intestinal Lamina Propria Anat Rec (Hoboken). 2018 Jun;301(6):1103-1114. DOI:10.1002/ar.23780
[2] Miklós Palotai, et al. Neuropeptide AF induces anxiety-like and antidepressant-like behavior in mice. Behav Brain Res. 2014 Nov 1;274:264-9. DOI:10.1016/j.bbr.2014.08.007