PubMed:28842215 JSONTXT

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and expression of the recombinant crustacean hyperglycemic hormone isoform B2 (rCHH-B2) and its effects on the metabolism and osmoregulation of the Pacific white shrimp Litopenaeus vannamei.\nCrustacean hyperglycemic hormones (CHHs) are multifunctional neuropeptides ubiquitous in crustaceans. In Litopenaeus vannamei, CHH-B2 is a CHH eyestalk isoform whose expression has been shown to vary with enviromental conditions, suggesting its relevance for ecophysiological performance of shrimp, controlling processes related to metabolism and osmo-ionic regulation. To study the involvement of CHH-B2 in these processes, we cloned and expressed a recombinant version with a free C-terminal glycine (rCHH-B2-Gly) in the methylotrophic yeast Pichia pastoris. The rCHH-B2-Gly peptide secreted to the culture medium was purified by RP-HPLC and used for in vivo glucose, triglyceride, and osmoregulation dose-response analyses with juvenile shrimp. The peptide was also amidated at the C-terminus using an α-amidating enzyme to produce rCHH-B2-amide. The shrimp showed a dose-dependent effect of rCHH-B2-Gly to hemolymph glucose and triglyceride levels, inducing maximal increases by injecting 500 and 1000 pmol of hormone, respectively. Additionally, 10 pmol of hormone was sufficient to reduce the hypo-osmoregulatory capacity of shrimp at 35‰. These findings suggest that CHH-B2 has regulatory roles in carbohydrate and lipid metabolism, and a potential involvement in osmoregulation of L. vannamei. Injection of 100 pmol of rCHH-B2-amide increased glucose and triglyceride levels by 15 and 28%, respectively in comparison with rCHH-B2-Gly, suggesting an important role for the C-terminal amidation. Additionally, an in silico structural analysis done with the CHH-B1 and rCHH-B2-Gly peptides suggests that the C-terminal region may be relevant for the activity of the L. vannamei isoforms and explain the functional divergence from other crustacean CHH/CHH-like peptides."}