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Leu8 and Pro8 oxytocin agonism differs across human, macaque, and marmoset vasopressin 1a receptors.

Abstract：

:Oxytocin (OXT) is an important neuromodulator of social behaviors via activation of both oxytocin receptors (OXTR) and vasopressin (AVP) 1a receptors (AVPR1a). Marmosets are neotropical primates with a modified OXT ligand (Pro8-OXT), and this ligand shows significant coevolution with traits including social monogamy and litter size. Pro8-OXT produces more potent and efficacious responses at primate OXTR and stronger behavioral effects than the consensus mammalian OXT ligand (Leu8-OXT). Here, we tested whether OXT/AVP ligands show differential levels of crosstalk at primate AVPR1a. We measured binding affinities and Ca2+ signaling responses of AVP, Pro8-OXT and Leu8-OXT at human, macaque, and marmoset AVPR1a. We found that AVP binds with higher affinity than OXT across AVPR1a, and marmoset AVPR1a show a 10-fold lower OXT binding affinity compared to human and macaque AVPR1a. Both Leu8-OXT and Pro8-OXT produce a less efficacious response than AVP at human AVPR1a and higher efficacious response than AVP at marmoset AVPR1a. These data suggest that OXT might partially antagonize endogenous human AVPR1a signaling and enhance marmoset AVPR1a signaling. These findings aid in further understanding inconsistencies observed following systemic intranasal administration of OXT and provide important insights into taxon-specific differences in nonapeptide ligand/receptor coevolution and behavior.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Mustoe A,Schulte NA,Taylor JH,French JA,Toews ML

doi

10.1038/s41598-019-52024-9

subject

Has Abstract

pub_date

2019-10-29 00:00:00

pages

15480

issue

1

issn

2045-2322

pii

10.1038/s41598-019-52024-9

journal_volume

9

pub_type

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