number of downloads : ?
language
eng
Author
Sugimoto, Naotoshi Department of Environmental Physiology Faculty of Medicine Shimane University Izumo Japan
Katakura, Masanori
Sumiyoshi, Eri Department of Environmental Physiology Faculty of Medicine Shimane University Izumo Japan
Hashimoto, Michio
Description
Saliva-a water-based fluid containing electrolytes, immunoglobulins, and enzymes-has many functions, including the protection and hydration of mucosal structures within the oral cavity and the initiation of digestion. Aquaporins (AQPs) are proteins that act as water channels through membranes. We have previously reported upregulation of the expression levels of AQP 1 and 5 in the submandibular glands (SMGs) in heat-acclimated rats. In this study, we investigated pilocarpine-induced saliva secretion and AQP expression in rats after voluntary exercise. Male, 10-week-old Wistar rats were initially maintained at an ambient temperature of 24 °C for 10 days and were then kept for 40 days in cages either with a running wheel (exercise rats, n = 6) or with a locked wheel [control rats (CN), n = 6]. After the training period, the rats were anesthetized and pilocarpine, an M3 muscarinic receptor agonist, was intraperitoneally injected (0.5 mg·kg-1) to stimulate saliva secretion. Saliva was collected, and the SMGs were sampled and subjected to western blot, RT-PCR, and immunohistochemical analyses. Pilocarpine induced a greater amount of saliva in the exercised rats than in the CN. Expression levels of AQP1 mRNA and protein were significantly higher in SMGs of exercised rats than in those of the CN, but the expression of AQP5 was not affected by voluntary exercise. Voluntary exercise increased the expression of vascular endothelial growth factor (VEGF) and cluster of differentiation 31 (CD31), a marker for endothelial cells, in the SMGs. Voluntary exercise promoted pilocarpine-induced saliva secretion, probably via an increase in the expression level of AQP1 due to VEGF-induced CD31-positive angiogenesis in the SMG.
Subject
aquaporin
submandibular gland
vascular endothelial growth factor
voluntary exercise
Journal Title
FEBS Open Bio
Volume
8
Issue
1
Start Page
85
End Page
93
ISSN(Online)
2211-5463
Published Date
2018
DOI
PubMed ID
Publisher
Elsevier
NII Type
Journal Article
Format
PDF
Text Version
出版社版
Gyoseki ID
e33909
OAI-PMH Set
Faculty of Medicine