Abstract:
:The genus Cnidoscolus (Euphorbiaceae) is widely distributed in tropical areas. In the Northeast of Brazil, the species C. quercifolius is endemic and has been used in traditional medicine. In this study, a novel protein was isolated from C. quercifolius seeds and characterized by its molecular weight, primary structure, isoelectric point (pI), and carbohydrate content. The hypoglycemic activity of this protein was investigated by in vitro assay with the RIN-5F glucose-responsive cell line and in vivo test using alloxan-induced diabetic mice models. In addition, safe use of the protein was also investigated by cytotoxicity, hemagglutinating, and immunogenicity assays. The protein which was named Cq-IMP (Cnidoscolus quercifolius - Insulin Mimetic Protein) showed a single 11.18 KDa glycopolypeptide chain (16.4% of carbohydrates, m/m), pI of 8.0 and N-terminal sequence (TKDPELKQcKKQQKKqQQYDDDDKK) with similarity around 46-62% to sucrose binding protein-like and vicilin-like protein that was confirmed by mass spectrometry tryptic peptides analysis. Besides that, Cq-IMP presented anti-insulin antibody cross-reactivity as hypoglycemic activity in both in vitro and in vivo models. Additionally, it did not present any toxicity by methods tested. In conclusion, Cq-IMP is an insulin-mimetic protein, with a potent hypoglycemic activity and no toxicity showing great potential for therapeutic applications and drug development.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Moura LFWG,da Silva Costa HP,da Silva Neto JX,Dias LP,Magalhães FEA,van Tilburg MF,Florean EOPT,de Oliveira JTA,Oliveira Bezerra de Sousa D,Guedes MIFdoi
10.1016/j.ijbiomac.2020.05.033subject
Has Abstractpub_date
2020-09-15 00:00:00pages
886-895eissn
0141-8130issn
1879-0003pii
S0141-8130(20)33178-0journal_volume
159pub_type
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