Work

Immunohistochemical distribution of cannabinoid receptor type 1 (CB1) and type 2 (CB2) in the rat carotid body

Year: 2024

Type: article

Abstract: The carotid body is a hypoxia-sensitive chemoreceptor that induces sensory long-term facilitation after exposure to chronic intermittent hypoxia . However, the mechanisms underlying synaptic plasticity in the carotid body remain unknown. In the present study, we examined the immunohistochemical distribution of cannabinoid receptor type 1 (CB1) and type 2 (CB2), which are candidate molecules involved in the modulation of synaptic transmission . Dot-like CB1 immunoreactivity was distributed in the perinuclear cytoplasm of chemoreceptor cells immunoreactive for the catecholamine-synthesizing enzymes, tyrosine hydroxylase and dopamine beta-hydroxylase. Furthermore, CB1 immunoreactivity was observed in sensory nerve endings immunoreactive for P2X 3 purinoceptors that colocalized with vesicular glutamate transporter 2 . On the other hand, immunoreactivity for CB2 was mainly distributed in chemoreceptor cells, and was weakly observed in sensory nerve endings immunoreactive for P2X 2 purinoceptors. The present results suggest that CB1 and CB2 regulate the release of catecholamines and glutamate from chemoreceptor cells and sensory nerve endings, respectively. Therefore, CB1 and CB2 may be involved in synaptic plasticity in the carotid body.

Source: Acta Histochemica

DOI: 10.1016/j.acthis.2024.152205

Authors: Hiroki Saito, Takuya Yokoyama, Nobuaki Nakamuta, Yoshio Yamamoto

Institution: Iwate University

Language: English

Topic: Neuroscience of respiration and sleep

Subfield: Endocrine and Autonomic Systems

Field: Neuroscience

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $3,070