alexa Does Epigallocatechin-3-Gallate-Insulin Complex Protect
ISSN: 2167-065X

Clinical Pharmacology & Biopharmaceutics
Open Access

OMICS International organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

Open Access Journals gaining more Readers and Citations

700 Journals and 15,000,000 Readers Each Journal is getting 25,000+ Readers

This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)

Research Article

Does Epigallocatechin-3-Gallate-Insulin Complex Protect Human Insulin from Proteolytic Enzyme Action?

Antoine Al-Achi1* and Deepthi Kota2
1Campbell University College of Pharmacy and Health Sciences, P.O. Box 1090, Buies Creek, NC 27506, USA
2Novel Laboratories, 400 Campus Drive Somerset, NJ 08873, USA
Corresponding Author : Antoine Al-Achi
Associate Professor
Department of Pharmaceutical Sciences
Campbell University College of Pharmacy and Health Sciences, P.O. Box 1090
Buies Creek, NC 27506, USA
Tel: 910-893-170
E-mail: [email protected]
Received: June 29, 2015 Accepted: July 16, 2015 Published: July 22, 2015
Citation: Al-Achi A, Kota D (2015) Does Epigallocatechin-3-Gallate-Insulin Complex Protect Human Insulin from Proteolytic Enzyme Action? Clin Pharmacol Biopharm 4:139. doi:10.4172/2167-065X.1000139
Copyright: © 2015 Al-Achi A. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Related article at Pubmed, Scholar Google
 

Abstract

Insulin is a polypeptide hormone produced by the β cells present in Islets of Langerhans of the pancreas. Either failure to produce (type 1 diabetes) or utilize insulin (type 2 diabetes) causes diabetes mellitus. Insulin administration is used to treat type 1 diabetes. The common route for insulin administration is via subcutaneous injection. The oral insulin delivery has been proposed, however it suffers from poor bioavailability which is mainly due to the presence of proteolytic enzymes (pepsin, trypsin, and chymotrypsin) in the gastrointestinal (GI) tract. Protecting insulin from these enzymes when given orally might improve its bioavailability. In general, condensed tannins have been shown to reduce the activity of digestive enzymes. Epigallocatechin-3-gallate (EGCG) is the most abundant tannin component found in green tea. The present study investigated the ability of EGCG to protect insulin, through the formation of EGCGinsulin complex, from the proteolytic enzyme action by pepsin and trypsin/chymotrypsin, in vitro. The amount of insulin remaining in the presence and absence of EGCG following incubation with either simulated gastric fluid (SGF) containing pepsin or simulated intestinal fluid (SIF) containing trypsin/chymotrypsin at two different temperatures (25°C and 37°C) for 1 hour and 7 hours was determined using an HPLC technique. The results showed that the presence of proteolytic enzymes (pepsin or trypsin/chymotrypsin) and absence of EGCG in the sample negatively affected the stability of insulin in solution. In the presence of EGCG, insulin was partially protected from trypsin/chymotrypsin but it was not protected from the action of pepsin. Insulin degradation was more pronounced at 37°C than that at 25°C (p = 0.0188). The initial concentration of insulin present (10 IU/mL or 20 IU/mL) or the time of incubation (1 h vs. 7 h) had no influence on the stability of insulin in the sample (p = 0.2842 and p = 0.2114, respectively). In conclusion, EGCG was not able to protect insulin against the proteolytic activity of pepsin. However, EGCG was shown to have some protective effect on insulin against the degradative effect of trypsin/chymotrypsin at room temperature, in vitro. Furthermore, this protection was greatly weakened at 37°C, which suggested that the protective action of EGCG would not be present in vivo.

Keywords

Share This Page

Additional Info

Loading
Loading Please wait..
 
Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

 
© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords