Abstract:
:Peripheral-type benzodiazepine receptor (PBR) and central-type benzodiazepine receptor (CBR) in salivary gland play a role in the inhibitory regulation of salivary secretion in rodents. Diazepam-binding inhibitor (DBI), an endogenous ligand for PBR, produces neurosteroids, which modulate CBR activity. In this study, we investigated the effect of repetitive administration of diazepam (DZP) on salivary secretion and expression of DBI mRNA and peptide. Moreover, mRNA expression of PBR and pituitary adenylate cyclase-activating polypeptide (PACAP), a transcriptional regulator for DBI promoter, was evaluated after repetitive administration of DZP. Repetitive administration, but not single administration, of 0.4 mg/kg DZP caused inhibition of salivary secretion and enhanced expression of DBI, PACAP, and PBR mRNA in rat salivary gland, with an increase in production of DBI peptide. These results suggest that repetitive administration of DZP stimulates DBI production, which may result in an increase in the suppressive effect of DZP on salivary secretion.
journal_name
J Pharmacol Scijournal_title
Journal of pharmacological sciencesauthors
Tsukagoshi E,Kawaguchi M,Shinomiya T,Yoshikawa M,Kawano T,Okubo M,Sawaki Kdoi
10.1254/jphs.10282FPsubject
Has Abstractpub_date
2011-01-01 00:00:00pages
221-229issue
2eissn
1347-8613issn
1347-8648pii
S1347-8613(19)30788-1journal_volume
115pub_type
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