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Molecular and physiological functions of PACAP in sweat secretion.pdf (7.88 MB)

Molecular and physiological functions of PACAP in sweat secretion

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posted on 2023-03-29, 15:46 authored by Michio Yamashita, Junko Shibato, Randeep Rakwal, Naoko Nonaka, Takahiro Hirabayashi, Brian HarveyBrian Harvey, Seiji Shioda, Fumiko Takenoya

Sweat plays a critical role in human body, including thermoregulation and the maintenance of the skin environment and health. Hyperhidrosis and anhidrosis are caused by abnormalities in sweat secretion, resulting in severe skin conditions (pruritus and erythema). Bioactive peptide and pituitary adenylate cyclase-activating polypeptide (PACAP) was isolated and identified to activate adenylate cyclase in pituitary cells. Recently, it was reported that PACAP increases sweat secretion via PAC1R in mice and promotes the translocation of AQP5 to the cell membrane through increasing intracellular [Ca2+] via PAC1R in NCL-SG3 cells. However, intracellular signaling mechanisms by PACAP are poorly clarified. Here, we used PAC1R knockout (KO) mice and wild-type (WT) mice to observe changes in AQP5 localization and gene expression in sweat glands by PACAP treatment. Immunohistochemistry revealed that PACAP promoted the translocation of AQP5 to the lumen side in the eccrine gland via PAC1R. Furthermore, PACAP up-regulated the expression of genes (Ptgs2, Kcnn2, Cacna1s) involved in sweat secretion in WT mice. Moreover, PACAP treatment was found to down-regulate the Chrna1 gene expression in PAC1R KO mice. These genes were found to be involved in multiple pathways related to sweating. Our data provide a solid basis for future research initiatives in order to develop new therapies to treat sweating disorders. 

Funding

JSPS KAKENHI [Grant Numbers JP20K20392, JP22H03178]

History

Data Availability Statement

All the whole-genome DNA microarray data are publically available for the scientific community at the NCBI’s GeneExpression Omnibus under the GEO series accession number GSE223124.

Comments

The original article is available at https://www.mdpi.com/

Published Citation

Yamashita M. et al. Molecular and physiological functions of PACAP in sweat secretion. Int J Mol Sci. 2023;24(5):4572.

Publication Date

26 February 2023

PubMed ID

36902003

Department/Unit

  • Beaumont Hospital
  • Molecular Medicine

Publisher

MDPI

Version

  • Published Version (Version of Record)