Table 2 Mammalian sympathetic neurotransmitters and their receptors
Neurotransmitters | Receptors | Neuropeptide genes | Neurotransmitter receptor genes |
|---|---|---|---|
Catecholaminergic | Â | Â | Â |
Norepinephrine or noradrenaline (NA) | ≤10−8 M: α 1a-, b-, d- adrenoceptors |  | ADRA1A, ADRA1B, ADRA1D |
≤10-8 M: α 2a-, b-, c-adrenoceptors |  | ADRA2A, ADRA2B, ADRA2C | |
≥10−6 M: β1-, β2-, β3-adrenoceptors |  | ADRB1, ADRB2, ADRB3 | |
Peptidergic | Â | Â | Â |
Vasoactive intestinal peptide (VIP) | VIP-1, VIP-2, and VIP/PACAP receptors | VIP | VIPR1, VIPR2 |