Expression of pancreatic enzyme genes during the early larval stage of Japanese eel Anguilla japonica   总被引：1，自引：0，他引：1  

TADAHIDE KUROKAWA  TOHRU SUZUKI  HIROMI OHTA  HIROHIKO KAGAWA  HIDEKI TANAKA  TATSUYA UNUMA 《Fisheries Science》2002,68(4):736-744

ABSTRACT: To reveal the ontogeny of pancreatic exocrine function in the early larval stage of eel, cDNAs encoding major pancreatic enzymes, trypsinogen, amylase and lipase were identified from the Japanese eel Anguilla japonica and their expression pattern in larvae was analyzed. The cloned eel trypsinogen precursor consisted of 224 amino acids and showed 82.2% identity to trypsinogen-2 of winter flounder Pleuronectes americanus . The eel amylase precursor consisted of 512 amino acids and showed 77% identity to winter flounder amylase. Eel pancreatic lipase was composed of 470 amino acids and had 58.3% of identity to human pancreatic lipase. In the eel larvae, mRNA expression of trypsinogen and amylase was first detected at 6 days post-hatching (d.p.h.), and the expression level increased between 7 and 8 d.p.h. In contrast, mRNA expression of lipase was first detected at 8 d.p.h. Eel larvae start to feed actively at 8 d.p.h. Thus, it was indicated that eel pancreas starts to synthesize digestive enzymes at 6 d.p.h. and acquires full function by the onset of exogenous feeding at 8 d.p.h.  相似文献   

Possible involvement of calcitonin gene-related peptide in seawater adaptation of flounder: Expression analysis of its receptor mRNA in the gill     

NOBUO  SUZUKI  TOHRU  SUZUKI  TADAHIDE  KUROKAWA 《Fisheries Science》2002,68(2):425-429

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