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Insulin: Biosynthesis, Chemistry, and Preparation01:25

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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
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Coculture Analysis of Extracellular Protein Interactions Affecting Insulin Secretion by Pancreatic Beta Cells
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Engineering of a Biologically Active Insulin Dimer.

Mengjie Liu1, Barbara F White2, Praveen Praveen1

  • 1The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Victoria 3010, Australia.

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Summary

A novel insulin dimer offers a promising new therapy for diabetes. This engineered insulin demonstrates equipotency, sustained action, and enhanced stability compared to existing treatments.

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Area of Science:

  • Biochemistry
  • Endocrinology
  • Pharmacology

Background:

  • The global rise in diabetes necessitates innovative therapeutic solutions.
  • Current insulin therapies face challenges in efficacy, safety, and convenience.
  • There is a critical need for advanced diabetes management strategies.

Purpose of the Study:

  • To synthesize and characterize a novel disulfide-linked human insulin dimer.
  • To evaluate the binding affinity, in vivo efficacy, and pharmacokinetic profile of the insulin dimer.
  • To assess the stability and production yield of the novel insulin analogue.

Main Methods:

  • Chemical synthesis of a human insulin dimer via N-terminal B-chain cysteine tethering.
  • Binding assays using insulin receptor isoform B and insulin-like growth factor-1 receptor.
  • In vivo insulin tolerance tests comparing the dimer to Actrapid and Glargine.
  • Proteolysis resistance assays and yield determination from a monomeric thiol insulin scaffold.

Main Results:

  • The synthesized insulin dimer exhibited comparable binding affinity to native insulin for both insulin receptor isoform B and IGF-1R.
  • In vivo studies showed the dimer was equipotent to Actrapid insulin with a prolonged duration of action.
  • The dimeric insulin displayed increased resistance to proteolysis and was produced in quantitative yield.
  • Secondary structure analysis indicated similarity to native insulin.

Conclusions:

  • The novel disulfide-linked insulin dimer presents a potentially superior therapeutic option for diabetes management.
  • This analogue addresses key clinical needs through enhanced efficacy, safety, and convenience.
  • The efficient synthesis and favorable properties suggest significant clinical potential for this engineered insulin.