Abstract：
:Serotonin (5-HT) is a key regulator of mood and sexual behaviors. 5-HT reuptake inhibitors have been used as antidepressants. Really interesting new gene (RING) finger proteins have been associated with 5-HT regulation but their role remains largely unknown. Some RING finger proteins are involved in the serotonergic system, therefore, we speculate that the gene expression of RING finger protein38 (rnf38) is regulated by the serotonergic system. In the present study, we aimed to identify the full length sequence of medaka (Oryzias latipes) rnf38 mRNA and investigate its association with the serotonergic system using an antidepressant, citalopram (CIT). We identified the full length rnf38 cDNA, which consisted of 2726 nucleotides spanning 12 exons and the deduced protein sequence consisting of 518 amino acid residues including a RING finger domain, a KIT motif and a coiled-coil domain. Medaka exposed to 10(-7)M of CIT showed anxiety-like behavior. The expressions of 5-HT-related genes, pet1, solute carrier family 6, member 4A (slc6a4) and tryptophan hydroxylase (tph2) were significantly low (P<0.05) in the hindbrain. On the other hand, rnf38 gene was significantly high (P<0.05) in the telencephalon and the hypothalamus. This shows that 5-HT synthesis and transport in the hindbrain is suppressed by CIT, which induces rnf38 gene expression in the forebrain where 5-HT neurons project. Thus, the expression of rnf38 is negatively regulated by the serotonergic system.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Moriya S,Khel NB,Parhar ISdoi
10.1016/j.neuroscience.2015.03.012subject
Has Abstractpub_date
2015-05-21 00:00:00pages
109-15eissn
0306-4522issn
1873-7544pii
S0306-4522(15)00227-4journal_volume
294pub_type
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