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Distribution of vasopressin 1a and oxytocin receptor protein and mRNA in the basal forebrain and midbrain of the spiny mouse (Acomys cahirinus)

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Abstract

The nonapeptide system modulates numerous social behaviors through oxytocin and vasopressin activation of the oxytocin receptor (OXTR) and vasopressin receptor (AVPR1A) in the brain. OXTRs and AVPR1As are widely distributed throughout the brain and binding densities exhibit substantial variation within and across species. Although OXTR and AVPR1A binding distributions have been mapped for several rodents, this system has yet to be characterized in the spiny mouse (Acomys cahirinus). Here we conducted receptor autoradiography and in situ hybridization to map distributions of OXTR and AVPR1A binding and Oxtr and Avpr1a mRNA expression throughout the basal forebrain and midbrain of male and female spiny mice. We found that nonapeptide receptor mRNA is diffuse throughout the forebrain and midbrain and does not always align with OXTR and AVPR1A binding. Analyses of sex differences in brain regions involved in social behavior and reward revealed that males exhibit higher OXTR binding densities in the lateral septum, bed nucleus of the stria terminalis, and anterior hypothalamus. However, no association with gonadal sex was observed for AVPR1A binding. Hierarchical clustering analysis further revealed that co-expression patterns of OXTR and AVPR1A binding across brain regions involved in social behavior and reward differ between males and females. These findings provide mapping distributions and sex differences in nonapeptide receptors in spiny mice. Spiny mice are an excellent organism for studying grouping behaviors such as cooperation and prosociality, and the nonapeptide receptor mapping here can inform the study of nonapeptide-mediated behavior in a highly social, large group-living rodent.

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Data availability

Data are available upon request from the corresponding author.

Abbreviations

AOB:

Accessory olfactory bulb

aco:

Anterior commissure

AI:

Agranular insular area of the cortex

AHAL:

Amygdalohippocampal area, anterolateral part

AH:

Anterior hypothalamus

AOA:

Anterior olfactory areas

APT:

Anterior pretectal nucleus

BLA:

Basolateral amygdala

BNST:

Bed nucleus of the stria terminalis

BNSTa:

Bed nucleus of the stria terminalis, anterior division

BNSTp:

Bed nucleus of the stria terminalis, posterior division

CPu:

Caudate putamen

CeA:

Central amygdala

Cg:

Cingulate cortex

cc:

Corpus callosum

Cg2:

Cortical layer 2

Cg5:

Cortical layer 5

DG:

Dentate gyrus

VDB:

Diagonal band nucleus

DI:

Dysgranular insular cortex

GP:

Globus pallidus

Hi:

Hippocampus

CA1:

Hippocampal field CA1

CA1py:

Hippocampal field CA1 pyramidal layer

CA3:

Hippocampal field CA3

IP:

Interpeduncular nucleus

LD:

Lateral dorsal nucleus of thalamus

LH:

Lateral hypothalamus

LS:

Lateral septum

LSc:

Lateral septum, caudo-dorsal region

LSv:

Lateral septum, ventral region

MOB:

Main olfactory bulb

MOBgl:

Main olfactory bulb, glomerular layer

MOBgr:

Main olfactory bulb, granule layer

MeA:

Medial amygdala

MG:

Medial geniculate nucleus of the thalamus

MM:

Medial mammillary nucleus of the hypothalamus

MPOA:

Medial preoptic area of the hypothalamus

NAcc:

Nucleus accumbens

OT:

Olfactory tubercle

och:

Optic chiasm

PV:

Paraventricular thalamic nucleus

PVA:

Paraventricular thalamic nucleus, anterior division

PAG:

Periaqueductal gray

PVG:

Periventricular gray

PIR:

Piriform area

Re:

Reuniens thalamic nucleus

SC:

Superior colliculus

SuG:

Superior colliculus, superficial gray, sensory related

SCm:

Superior colliculus, motor related

SCN:

Suprachiasmatic nucleus of the hypothalamus

TT:

Taenia tecta

3 V:

Third ventricle

VPL:

Ventral posterolateral nucleus of the thalamus

VMH:

Ventromedial hypothalamic nucleus

VPall:

Ventral pallidum

VIS:

Visual areas of the cortex

ZI:

Zona incerta

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Funding

We would like to acknowledge funding from the Esther A. and Joseph Klingenstein Fund (Klingenstein-Simons Fellowship Award in Neuroscience to AMK), the National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR070313 to AWS), the National Science Foundation (IOS-1353713 to AWS), and the National Institute of Mental Health (Emory CONTE Center Pilot Project Grant; P50MH100023 to LJY and P51OD11132 to Emory National Primate Research Center).

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Authors and Affiliations

Authors

Contributions

JMP cryosectioned brains, conducted in situ hybridization, quantified receptor binding and mRNA expression, and wrote the manuscript. KI conducted the competitive binding assays and receptor autoradiography. KJW analyzed the data. AWS provided feedback on and edited the manuscript. LJY designed the study, provided feedback on and edited the manuscript, and acquired funding. AMK designed the study, analyzed the data, wrote the manuscript, and acquired funding.

Corresponding author

Correspondence to Aubrey M. Kelly.

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Competing interests

The authors have no relevant financial or non-financial interests to disclose.

Ethics approval

All procedures were approved by the Institutional Animal Care and Use Committee of Emory University.

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Powell, J.M., Inoue, K., Wallace, K.J. et al. Distribution of vasopressin 1a and oxytocin receptor protein and mRNA in the basal forebrain and midbrain of the spiny mouse (Acomys cahirinus). Brain Struct Funct 228, 413–431 (2023). https://doi.org/10.1007/s00429-022-02581-z

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  • DOI: https://doi.org/10.1007/s00429-022-02581-z

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