Abstract
The insulin receptor substrate (IRS) proteins, in particular, IRS1 and IRS2, are the key downstream players of insulin signaling pathway and the regulation of lipid metabolism. In the present study, two genes of IRS (IRS1 and IRS2) were isolated and characterized from yellow catfish Pelteobagrus fulvidraco. Their molecular characterizations, tissue expressions, and transcriptional levels by insulin both in vivo and in vitro were determined. The validated complementary DNAs encoding for IRS1 and IRS2 were 3693 and 3177 bp in length, encoding proteins of 1230 and 1058 amino acid residues, respectively. Similarly to mammals, amino acid sequence alignment revealed that IRSs contained an N-terminal pleckstrin homology (PH) domain, a phosphotyrosine-binding (PTB) domain, and several C-terminal multiple sites of tyrosine phosphorylation. Both IRS1 and IRS2 were widely expressed across the ten tissues (liver, white muscle, spleen, brain, gill, mesenteric fat, anterior intestine, heart, mid-kidney, and ovary), but at the variable levels. Insulin injection at 1 μg/g in vivo significantly stimulated the messenger RNA (mRNA) expression of IRS2, but not IRS1 mRNA expression levels in the liver of yellow catfish after 48 h. In hepatocytes of yellow catfish, insulin incubation significantly stimulated the IRS1 (at a 1000 nM insulin group) and IRS2 (at both 100 and 1000 nM insulin groups) mRNA expressions, which indicated that IRS2 was more sensitive than IRS1 to insulin stimulation in the liver of yellow catfish, and IRS2 played a more important role in mediating insulin’s effects on the liver metabolism. The present study serves to increase our understanding into the function of IRS in fish.
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Abbreviations
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- HPRT:
-
Hypoxanthine-guanine phosphoribosyl transferase
- IRS:
-
Insulin receptor substrate
- MS-222:
-
Tricaine methanesulfonate
- MW:
-
Molecular weight
- ORF:
-
Open-reading frame
- PI3K:
-
Phosphoinositide 3-kiases
- PH:
-
Pleckstrin homology
- PTB:
-
Phosphotyrosine-binding
- RPL7:
-
Ribosomal protein L7
- SH2:
-
Src homology 2
- TUBA:
-
Tubulin alpha chain
- UBCE:
-
Ubiquitin-conjugating enzyme
- UTR:
-
Untranslated region
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 31422056) and Fundamental Research Funds for the Central Universities, China (Grants Nos. 2014JQ002, 2662015PY017).
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Zhuo, MQ., Pan, YX., Wu, K. et al. IRS1 and IRS2: molecular characterization, tissue expression and transcriptional regulation by insulin in yellow catfish Pelteobagrus fulvidraco . Fish Physiol Biochem 43, 619–630 (2017). https://doi.org/10.1007/s10695-016-0316-1
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DOI: https://doi.org/10.1007/s10695-016-0316-1