Distribution of vasoactive intestinal peptide and pituitary adenylate cyclase‐activating polypeptide receptors (VPAC1, VPAC2, and PAC1 receptor) in the rat brain

Jul 30, 2004The Journal of comparative neurology

Locations of VIP and PACAP receptors controlling blood flow and cell signaling in the rat brain

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Abstract

High levels of the VPAC1 receptor were found in the cerebral cortex, hippocampal formation, and brainstem.

VIP/PACAP receptors (VPAC1, VPAC2, and PAC1) have distinctive, complementary, and overlapping distribution patterns in the rat brain.
VPAC2 receptors are primarily concentrated in the cerebral cortex, hippocampal formation, and amygdala.
PAC1 receptors have a more restricted distribution, primarily located in the cerebellar cortex and hypothalamus.
All three types of VIP/PACAP receptors are present in astrocytes, while PAC1 receptors are also found in oligodendrocytes.
The presence of VIP/PACAP receptors in both neurons and neuroglia suggests their functional roles in various brain regions.

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To examine the distributions of VIP/PACAP receptors (VPAC1, VPAC2, and PAC1 receptors) in the brain and to identify the cell types that express these receptors, we performed immunohistochemistry and double immunofluorescence in the rat brain with specific antibodies. The immunohistochemistry revealed that the receptors had distinctive, complementary, and overlapping distribution patterns. High levels of the VPAC1 receptor were expressed in the cerebral cortex, hippocampal formation, deep cerebellar nuclei, thalamus, hypothalamus, and brainstem. The VPAC2 receptors were concentrated in the cerebral cortex, hippocampal formation, amygdalar regions, cerebellar cortex, deep cerebellar nuclei, hypothalamus, and brainstem. On the other hand, the PAC1 receptors had a more restricted distribution pattern in the brain, and high levels of the PAC1 receptors were confined to the cerebellar cortex, deep cerebellar nuclei, epithalamus, hypothalamus, brainstem, and white matter of many brain regions. Also, many fibers expressing the PAC1 receptors were observed in various areas, i.e., the thalamus, hypothalamus, and brainstem. The double immunofluorescence showed that the VIP/PACAP receptors were confined to the neuroglia as well as the neurons. All three types of the VIP/PACAP receptors were expressed in the astrocytes, and the PAC1 receptors were also expressed in the oligodendrocytes. These findings indicate that VIP and PACAP exert their functions through their receptors in specific locations in different combinations. We hope that this first demonstration of the distributions of the VIP/PACAP receptors provides data useful in the investigation of the mechanisms of the many functions of VIP and PACAP in the brain, which require further elucidation.

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Distribution of vasoactive intestinal peptide and pituitary adenylate cyclase‐activating polypeptide receptors (VPAC1, VPAC2, and PAC1 receptor) in the rat brain

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