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Updated: Nov 12, 2025

Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets
Published on: May 11, 2015
Defining the underlying defect in insulin action in type 2 diabetes
Thiago M Batista1, Nida Haider1, C Ronald Kahn2
1Section of Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA, USA.
Insulin resistance, a key defect in type 2 diabetes, involves complex molecular signaling in classical and non-classical tissues. Understanding cell-intrinsic and extrinsic factors is crucial for developing new therapies.
Area of Science:
- Endocrinology
- Molecular Biology
- Metabolic Diseases
Background:
- Insulin resistance is an early defect in type 2 diabetes pathogenesis.
- Insulin signaling regulates glucose, lipid, and protein metabolism in key tissues.
- Insulin receptors are also present in non-classical tissues, influencing various physiological functions.
Purpose of the Study:
- To dissect the determinants of insulin resistance in type 2 diabetes and metabolic syndrome.
- To differentiate between extrinsic and cell-intrinsic factors contributing to insulin resistance.
- To explore novel therapeutic and preventive strategies for type 2 diabetes.
Main Methods:
- Utilizing mass spectrometry and DNA/RNA-sequencing for molecular profiling.
- Investigating human induced pluripotent stem cells and tissues.
- Analyzing cell-autonomous alterations in signaling super-networks.
Main Results:
- Extrinsic factors like metabolites and exosomal microRNAs are well-studied determinants.
- Cell-intrinsic factors, including genetic and epigenetic programming, are more challenging to define.
- Cell-autonomous alterations in phosphorylation and gene expression are observed within and outside canonical insulin pathways.
Conclusions:
- Understanding multi-layered molecular networks modulating insulin action is key.
- New therapeutic and preventive avenues for type 2 diabetes can emerge from this research.
- Elucidating insulin resistance mechanisms offers insights into broader metabolic health.
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