Table 2 Potency and antagonistic index (AI) of typical MTNR antagonist in mammals for medaka MTNRs with EC90 melatonin.

From: Vertebrates originally possess four functional subtypes of G protein-coupled melatonin receptor

Ligand

MTNR1a

MTNR1b

MTNR1c

MTNR1a-like

Potency (M)

AI (%)

Potency (M)

AI (%)

Potency (M)

AI (%)

Potency (M)

AI (%)

4P-PDOT

NC

ND

1.9 ± 0.22 × 10−7

68.3 ± 8.0

NC

59.8 ± 4.9

NC

ND

Luzindole

NC

ND

NC

ND

NC

ND

NC

ND

  1. NC: not calculable (low activity, but its concentration-response curve did not reach maximum levels).
  2. ND: not detected.