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An In Ovo Model for Testing Insulin-mimetic Compounds
Published on: April 23, 2018
Oral insulin-mimetic compounds that act independently of insulin
Silvia García-Vicente1, Francesc Yraola, Luc Marti
1Institute for Research in Biomedicine, Josep Samitier 1-5, Barcelona, Spain.
Abstract:
The hallmarks of insulin action are the stimulation and suppression of anabolic and catabolic responses, respectively. These responses are orchestrated by the insulin pathway and are initiated by the binding of insulin to the insulin receptor, which leads to activation of the receptor's intrinsic tyrosine kinase. Severe defects in the insulin pathway, such as in types A and B and advanced type 1 and 2 diabetes lead to severe insulin resistance, resulting in a partial or complete absence of response to exogenous insulin and other known classes of antidiabetes therapies. We have characterized a novel class of arylalkylamine vanadium salts that exert potent insulin-mimetic effects downstream of the insulin receptor in adipocytes. These compounds trigger insulin signaling, which is characterized by rapid activation of insulin receptor substrate-1, Akt, and glycogen synthase kinase-3 independent of insulin receptor phosphorylation. Administration of these compounds to animal models of diabetes lowered glycemia and normalized the plasma lipid profile. Arylalkylamine vanadium compounds also showed antidiabetic effects in severely diabetic rats with undetectable circulating insulin. These results demonstrate the feasibility of insulin-like regulation in the complete absence of insulin and downstream of the insulin receptor. This represents a novel therapeutic approach for diabetic patients with severe insulin resistance.
Insights
Novel vanadium compounds mimic insulin action downstream of the insulin receptor, offering a new therapeutic strategy for severe insulin resistance and diabetes, even without circulating insulin.
Area of Science:
- Biochemistry
- Pharmacology
- Endocrinology
Background:
- Insulin action regulates anabolic and catabolic responses via the insulin receptor tyrosine kinase pathway.
- Severe insulin resistance, seen in advanced diabetes, impairs response to conventional therapies.
- A critical need exists for treatments effective in the absence of functional insulin signaling.
Purpose of the Study:
- To characterize novel arylalkylamine vanadium salts with insulin-mimetic effects.
- To investigate their mechanism of action downstream of the insulin receptor.
- To evaluate their therapeutic potential in animal models of diabetes.
Main Methods:
- Characterization of arylalkylamine vanadium salts in adipocytes.
- Assessment of insulin signaling activation (IRS-1, Akt, GSK-3) independent of insulin receptor phosphorylation.
- Administration to animal models of diabetes to assess glycemic control and lipid profiles.
Main Results:
- Vanadium compounds activated insulin signaling pathways (IRS-1, Akt, GSK-3) independently of insulin receptor phosphorylation.
- Treatment lowered blood glucose and normalized plasma lipids in diabetic animal models.
- Antidiabetic effects were observed even in rats with undetectable insulin levels.
Conclusions:
- Arylalkylamine vanadium salts exert potent insulin-mimetic effects downstream of the insulin receptor.
- These compounds offer a viable therapeutic approach for severe insulin resistance and diabetes.
- This represents a novel strategy for insulin-like regulation independent of insulin.
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