Rubiscolin-6 Activates Opioid Receptors to Enhance Glucose Uptake in Skeletal Muscle
Overview
Pharmacology
Toxicology
Authors
Affiliations
Rubiscolin-6 is an opioid peptide derived from plant ribulose bisphosphate carboxylase/oxygenase (Rubisco). It has been demonstrated that opioid receptors could control glucose homeostasis in skeletal muscle independent of insulin action. Therefore, Rubiscolin-6 may be involved in the control of glucose metabolism. In the present study, we investigated the effect of rubiscolin-6 on glucose uptake in skeletal muscle. Rubiscolin-6-induced glucose uptake was measured using the fluorescent indicator 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl) amino]-2-deoxyglucose (2-NBDG) in L6 and C2C12 cell lines. The protein expressions of glucose transporter 4 (GLUT4) and AMP-activated protein kinase (AMPK) in L6 cells were observed by Western blotting. The in vivo effects of rubiscolin-6 were characterized in streptozotocin (STZ)-induced diabetic rats. Rubiscolin-6 induced a concentration-dependent increase in glucose uptake levels. The increase of phospho-AMPK (pAMPK) and GLUT4 expressions were also observed in L6 and C2C12 cells. Effects of rubiscolin-6 were blocked by opioid receptor antagonists and/or associated signals inhibitors. Moreover, Rubiscolin-6 produced a dose-dependent reduction of blood glucose and increased GLUT4 expression in STZ-induced diabetic rats. In conclusion, rubiscolin-6 increases glucose uptake, potentially via an activation of AMPK to enhance GLUT4 translocation after binding to opioid receptors in skeletal muscle.
Perlikowska R, Silva J, Alves C, Susano P, Zaklos-Szyda M, Skibska A Neurochem Res. 2023; 49(4):895-918.
PMID: 38117448 PMC: 10901950. DOI: 10.1007/s11064-023-04070-z.
Therapeutic Potential of Orally Administered Rubiscolin-6.
Karasawa Y, Miyano K, Yamaguchi M, Nonaka M, Yamaguchi K, Iseki M Int J Mol Sci. 2023; 24(12).
PMID: 37373107 PMC: 10298254. DOI: 10.3390/ijms24129959.
Marinaccio L, Zengin G, Pieretti S, Minosi P, Szucs E, Benyhe S Food Chem X. 2023; 18:100640.
PMID: 37008720 PMC: 10064441. DOI: 10.1016/j.fochx.2023.100640.
Ataka K, Asakawa A, Kato I Mol Med Rep. 2022; 26(5).
PMID: 36111502 PMC: 9494588. DOI: 10.3892/mmr.2022.12856.
Wu Y, Lin Y, Yang W, Wang S, Chen Y J Food Drug Anal. 2022; 29(2):375-388.
PMID: 35696203 PMC: 9261818. DOI: 10.38212/2224-6614.3351.