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Chloride Influx of Anion Exchanger 2 Was Modulated by Calcium-Dependent Spinophilin in Submandibular Glands

Authors
 Dongun Lee  ;  Sang A. Lee  ;  Dong M. Shin  ;  Jeong H. Hong 
Citation
 FRONTIERS IN PHYSIOLOGY, Vol.9 : 889, 2018 
Journal Title
 FRONTIERS IN PHYSIOLOGY 
Issue Date
2018
Keywords
anion exchanger 2 ; calcium ; fluid secretion ; salivary glands ; spinophilin
Abstract
Secretory glands including salivary glands by many hormonal inputs produce and secrete biological fluids determined by variety of ion transporters. Spinophilin is a multifunctional scaffolding protein, which involved in receptor signaling and regulation of anion exchangers AE2 activity. We found that spinophilin expressed in salivary glands. The role of salivary spinophilin on the modulation of chloride/bicarbonate exchange remains unknown. The spinophilin enhanced AE2 activity and associated with a STE20/SPS1-related kinase and showed an additive effect on the modulation of the activity of AE2. The cholinergic stimulation and subsequent intracellular Ca2+ increase was required for the interaction with AE2 and spinophilin and abrogated the enhanced effect of spinophilin on Cl- transporting activity. Ductal chloride/bicarbonate exchange activity was increased in pretreatment with carbachol. The CaMKII inhibitor KN-93 suppressed the chloride/bicarbonate exchange activity of ducts, suggesting that CaMKII was required for ductal chloride/bicarbonate exchange activity. Additionally, microtubule destabilization by nocodazole attenuated the interaction of AE2 and spinophilin and almost abolished the ductal chloride/bicarbonate exchange activity. The treatment of siRNA-spinophilin on the isolated salivary ducts also reduced the ductal chloride/bicarbonate exchange activity. Therefore, role of salivary spinophilin on AE2 may facilitate the Cl- influx from basolateral in salivary glands in response to cholinergic inputs.
Files in This Item:
T201802210.pdf Download
DOI
10.3389/fphys.2018.00889
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실) > 1. Journal Papers
Yonsei Authors
Shin, Dong Min(신동민) ORCID logo https://orcid.org/0000-0001-6042-0435
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/163137
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