Abstract:
:Airway surface fluids are mainly secreted from submucosal glands, and play important roles in the defense of airways via the up-regulation of mucociliary transport, resulting in an exclusion of many microbes or foreign substances. Although there are many articles concerning the importance of Toll-like receptors (TLRs) in airway immune systems, whether TLRs directly cooperate with tracheal submucosal glands to increase secretion remains unknown. We investigated the effects of ligands of the three TLR subtypes (TLR2, TLR3, and TLR4) on the physiologic secretion of electrolytes by using a patch-clamp technique. Among these TLRs, only the TLR4 ligand, LPS, showed potentiating effects on acetylcholine (ACh)-induced ionic currents in a dose-dependent manner. These potentiating effects were completely abolished by pretreatment with a specific TLR4 antagonist or the anti-TLR4 antibody. LPS per se exerted no appreciable effect on baseline currents. Next, we demonstrated the abundant expression of TLR4 in submucosal gland acinar cells by using immunofluorescent staining and RT-PCR. Furthermore, we revealed that both nitric oxide synthase inhibitors and cyclic guanosine monophosphate (cGMP)-dependent protein kinase (cGK) inhibitors abolished the LPS-induced potentiating effects completely. Analyses of fluorescence intensities, using an intracellular nitric oxide (NO) indicator, demonstrated that LPS could further increase the ACh-induced synthesis of NO. These findings suggest that TLR4 takes part in airway mucosal defense systems as a unique exogenous potentiator of electrolyte-water secretion from submucosal gland acinar cells, and that NO/cGMP/cGK signaling is involved in this rapid TLR4 signaling pathway.
journal_name
Am J Respir Cell Mol Biolauthors
Murakami K,Tamada T,Nara M,Muramatsu S,Kikuchi T,Kanehira M,Maruyama Y,Ebina M,Nukiwa Tdoi
10.1165/rcmb.2011-0020OCsubject
Has Abstractpub_date
2011-11-01 00:00:00pages
1101-10issue
5eissn
1044-1549issn
1535-4989pii
2011-0020OCjournal_volume
45pub_type
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