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Related Experiment Videos

A new cell secreting insulin.

Sib Sankar Roy1, Mohua Mukherjee, Samir Bhattacharya

  • 1Indian Institute of Chemical Biology, Calcutta 700032, India.

Endocrinology
|March 18, 2003
PubMed
Summary

Carp adipocytes secrete highly active insulin, exhibiting unique characteristics similar to pancreatic beta-cells. This discovery suggests a potential natural alternative for insulin therapy in diabetes management.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Biochemistry

Background:

  • Pancreatic beta-cells are the primary source of insulin in animals.
  • The study investigates alternative sources of insulin production and function.

Purpose of the Study:

  • To identify and characterize insulin production in carp adipocytes.
  • To evaluate the biological activity and therapeutic potential of carp adipocyte-derived insulin (AdpInsl).

Main Methods:

  • Primary culture of carp adipocytes to assess insulin release.
  • Gene expression analysis (flotillin, PPARγ, Glut2, Glut4) and protein localization (insulin, leptin).
  • Biochemical characterization (SDS-PAGE), in vivo efficacy (diabetic rat model), and in vitro glucose uptake assays.
  • Molecular cloning, sequencing, and structural analysis of AdpInsl.

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Main Results:

  • Carp adipocytes release bioactive insulin, augmented by glucose, and express glucose transporters (Glut2).
  • These cells co-express adipocyte markers (flotillin, PPARγ, Glut4) and insulin, confirming their adipocyte identity.
  • AdpInsl exhibits high homology to other insulins, demonstrates potent anti-hyperglycemic effects, and superior glucose uptake stimulation compared to porcine insulin.
  • Structural analysis reveals a key amino acid difference (His at A8) contributing to AdpInsl's enhanced biological activity.

Conclusions:

  • Carp adipocytes possess unique dual functionality, acting as both insulin target cells and insulin-secreting cells.
  • AdpInsl represents a novel, highly potent form of insulin with potential therapeutic applications.
  • This finding challenges the traditional view of insulin production solely by pancreatic beta-cells.