Molecular cloning of a proglucagon in a cyprinid fish (Schizothorax prenanti): mRNA tissue distribution and quantification during periprandial changes and fasting

Lin, Fangjun; Chen, Hu; Ju, Liu; Gao, Yundi; Zhang, Xin; Hao, Jin; Chen, Defang; Wu, Hongwei; Yuan, Dengyue; Wang, Tao; Li, Zhiqiong

doi:10.1016/j.aquaculture.2015.06.014

Cited by 6 publications

(1 citation statement)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Low levels of plasma glucose in European sea bass were associated with a significant down-regulation of proglucagon a in the duodenum, although no changes in the expression of the glucagon-like receptors were observed. In fish, data on proglucagon mRNA expression in response to feeding status is scarce however in the cyprinid Ya-fish (Schizothorax prenanti), the proglucagon precursor was also significantly down-regulated in the intestine after three days of food depletion and changes in proglucagon expression have been associated with regulation of food intake (Lin et al, 2015). In fish, fasting decreases Gcg and Glp1 levels in plasma, however in some species, including sea bass an increase of Gcg plasma levels during short-term fasting has been described 4 days after food depletion and then subsequently decreased (Gutierrez et al, 1991;Navarro and Gutierrez, 1995;Navarro et al, 2002).…”

Section: Regulatory Role Of the Glucagon-like Systemmentioning

confidence: 99%

Evolution of the glucagon-like system across fish

Cardoso

Félix

Costa

et al. 2018

General and Comparative Endocrinology

View full text Add to dashboard Cite

In fishes, including the jawless lampreys, the most ancient lineage of extant vertebrates, plasma glucose levels are highly variable and regulation is more relaxed than in mammals. The regulation of glucose and lipid in fishes in common with mammals involves members of the glucagon (GCG)-like family of gastrointestinal peptides. In mammals, four peptides GCG, glucagon-like peptide 1 and 2 (GLP1 and GLP2) and glucose-dependent insulinotropic peptide (GIP) that activate four specific receptors exist. However, in lamprey and other fishes the glucagon-like family evolved differently and they retained additional gene family members (glucagon-related peptide, gcrp and its receptor, gcrpr) that are absent from mammals. In the present study, we analysed the evolution of the glucagon-like system in fish and characterized gene expression of the family members in the European sea bass (Dicentrarchus labrax) a teleost fish. Phylogenetic analysis revealed that multiple receptors and peptides of the glucagon-like family emerged early during the vertebrate radiation and evolved via lineage specific events. Synteny analysis suggested that family member gene loss is likely to be the result of a single gene deletion event. Lamprey was the only fish where a putative glp1r persisted and the presence of the receptor gene in the genomes of the elephant shark and coelacanth remains unresolved. In the coelacanth and elephant shark, unique proglucagon genes were acquired which in the former only encoded Gcg and Glp2 and in the latter, shared a similar structure to the teleost proglucagon gene but possessed an extra exon coding for Glp-like peptide that was most similar to Glp2. The variable tissue distribution of the gene transcripts encoding the ligands and receptors of the glucagon-like system in an advanced teleost, the European sea bass, suggested that, as occurs in mammals, they have acquired distinct functions. Statistically significant (p < .05) down-regulation of teleost proglucagon a in sea bass with modified plasma glucose levels confirmed the link between these peptides and metabolism. The tissue distribution of members of the glucagon-like system in sea bass and human suggests that evolution of the brain-gut-peptide regulatory loop diverged between teleosts and mammals despite the overall conservation and similarity of glucagon-like family members.

show abstract

Section: Regulatory Role Of the Glucagon-like Systemmentioning

confidence: 99%