Isolation and characterization of visceral excitatory neuropeptides from striped mullet (Mugil cephalus L.) brain.
From a brain extract of the catadromous fish, striped mullet (Mugil cephalus), two visceral excitatory neuropeptides (Mvp-1 and Mvp-2) were isolated by means of reversed phase chromatography together with bioassay on fish hindgut. The primary structure of Mvp-1 was elucidated to be SGPAGVLamide by ESI-Q-TOF mass spectrometry. The threshold concentration of Mvp-1 that changes spontaneous contraction of mullet hindgut was between 10(-9) and 10(-8) M. In addition, Mvp-1 was found to exert excitatory activities on some other smooth muscle segments (oviduct and esophagus) of mullet but it did not show any effect on body wall muscle strips. Therefore, the present study suggests that Mvp-1 and Mvp-2 peptides act as factors that control visceral contractions of mullet gastrointestinal tract.
Senaratne
Lasika S
LS
Department of Chemistry, Pukyong National University, Busan 608-737, Republic of Korea.
Mendis
Eresha
E
Kim
Se-Kwon
SK
D000595:Amino Acid Sequence; D000818:Animals; D001681:Biological Assay; D001921:Brain / Q000378:metabolism*; D008969:Molecular Sequence Data; D009130:Muscle, Smooth / Q000187:drug effects*; D009479:Neuropeptides / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D023701:Smegmamorpha / Q000378:metabolism*
D009479:Neuropeptides