Abstract
Pituitary adenylate cyclase-activating polypeptide (PACAP) is a neuropeptide with well-known neurotrophic, neuroprotective, antioxidant, and antiapoptotic effects. It also exerts protective effects in sensory organs, such as visual and olfactory system. In this review we present data regarding the localization and effects of PACAP in the auditory system. PACAP and its specific receptor (PAC1-R) are present in the organ of Corti in hair cells, supporting cells, and different nerve fibers. They are also present in the spiral ganglion showing co-localization with efferent fibers of glutamatergic and adrenergic pathways, probably directly affecting the efferent signal transduction in the inner ear. PACAP and its specific receptor also occur in the stria vascularis suggesting a role in endolymph production; furthermore, they are present in central pathways of the auditory system such as the cochlear nuclei, superior olivary complex, inferior colliculus, and medial geniculate body. PAC1-receptor is also present in the inner ear in PACAP-deficient mice, occurring at the same localization but with altered expression compared to wild-type mice. PACAP protects hair cells from H2O2-induced apoptosis in chicken inner ear cell cultures in vitro, and the lack of PACAP affects the Ca2+-binding protein expression in hair cells in PACAP-deficient mice under control circumstances and after ototoxic drug treatment.
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Abbreviations
- AC:
-
Adenylate cyclase
- ApoD:
-
Apolipoprotein D
- ApoJ:
-
Apolipoprotein J
- Bad:
-
bcl-2-associated death promoter
- Bax:
-
bcl-2-like protein 4
- Bcl:
-
B-cell lymphoma
- ChAT:
-
Choline acetyltransferase
- CREB:
-
cAMP response element-binding protein
- DBH:
-
Dopamine β-hydroxylase
- HZ:
-
Heterozygous PACAP-deficient mice
- ERK:
-
Extracellular-signal-regulated kinase
- GluR2/3:
-
Glutamate receptor 2/3
- JC-1:
-
5,5′,6,6′-Tetrachloro-1,1′,3,3′-tetraethylbenzimi-dazolylcarbocyanine iodide
- JNK:
-
c-Jun N-terminal kinase
- LW:
-
Lateral wall
- MNTB:
-
Medial nucleus of trapezoid body
- MTT assay:
-
Colorimetric assay for assessing cell metabolic activity
- nNOS:
-
Neuronal nitric oxide synthase
- OC:
-
Organ of Corti
- p38MAPK:
-
p38 mitogen-activated protein kinases
- P5:
-
5th postnatal day
- P7:
-
7th postnatal day
- PACAP:
-
Pituitary adenylate cyclase-activating polypeptide
- PACAP KO:
-
Homozygous PACAP-deficient mice
- PACAP38:
-
1-38 Amino-acid isoform of PACAP
- PAC1-R:
-
PAC1-receptor
- PKA:
-
Protein kinase A
- PLC:
-
Phospholipase C
- ROS:
-
Reactive oxygen species
- RT-PCR:
-
Reverse transcription-polymerase chain reaction
- SG:
-
Spiral ganglion
- SOC:
-
Superior olivary complex
- VIP:
-
Vasoactive intestinal polypeptide
- WT:
-
Wild type mice
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Acknowledgement
MTA-PTE “Lendulet” Program, OTKA K104984, 119759, Arimura Foundation, TAMOP 4.2.4.A/2-11-1-2012-0001 “National Excellence Program,” New National Excellence Program (UNKP), Janos Bolyai Research Scholarship of Hungarian Academy of Sciences. This work is dedicated to the 650th anniversary of the University of Pecs.
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Fulop, B.D., Reglodi, D., Nemeth, A., Tamas, A. (2016). Pituitary Adenylate Cyclase-Activating Polypeptide in the Auditory System. In: Reglodi, D., Tamas, A. (eds) Pituitary Adenylate Cyclase Activating Polypeptide — PACAP. Current Topics in Neurotoxicity, vol 11. Springer, Cham. https://doi.org/10.1007/978-3-319-35135-3_31
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DOI: https://doi.org/10.1007/978-3-319-35135-3_31
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