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Serotonin (5-HT) is an important neurotransmitter and neuromodulator that controls a variety of sensory and motor functions through 5-HT receptors (5-HTRs). The 5-HT4R subfamily is linked to Gs proteins, which activate adenylyl cyclases (ACs), and is involved in many responses in peripheral organs. In this study, the 5-HT4R from  Apostichopus japonicus (Aj 5-HT4R) was identified and characterised. The cloned full-length  Aj 5-HT4R cDNA is 1,544 bp long and contains an open reading frame 1,011 bp in length encoding 336 amino acid proteins. Bioinformatics analysis of the  Aj 5-HT4R protein indicated this receptor was a member of class A G protein coupled receptor (GPCR) family. Further experiments using  Aj 5-HT4R-transfected HEK293 cells demonstrated that treatment with 5-HT triggered a significant increase in intracellular cAMP level in a dose-dependent manner and induced a rapid internalisation of  Aj 5-HT4R fused with enhanced green fluorescent protein ( Aj 5-HT4R-EGFP) from the cell surface into the cytoplasm. In addition, the transcriptional profiles of  Aj5-HT4R  in aestivating  A. japonicas  and phosphofructokinase ( AjPFK ) in 5-HT administrated  A. japonicus  have been analysed by real-time PCR assays. Results have led to a basic understanding of  Aj 5-HT4R in  A. japonicus , and provide a foundation for further exploration of the cell signaling and regulatory functions of this receptor.

Identification and functional characterisation of 5-HT4 receptor in sea cucumber Apostichopus japonicus (Selenka)