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Decarboxylated osteocalcin (D-OC) enhances human beta-cell function and proliferation. This hormone shows potential for developing new diabetes treatments by improving insulin production and beta-cell mass.

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Area of Science:

  • Endocrinology
  • Metabolic Research
  • Diabetes Research

Background:

  • Osteocalcin (OC) is an osteoblast-specific hormone regulating glucose and fat metabolism.
  • Previous studies in mice suggest OC influences beta-cell proliferation.
  • The specific effects of decarboxylated OC (D-OC) on human beta-cells remain largely unexplored.

Purpose of the Study:

  • To investigate the impact of D-OC on human beta-cell function and mass in vitro and in vivo.
  • To assess D-OC's potential for therapeutic applications in diabetes.

Main Methods:

  • Cultured human islets treated with varying doses of D-OC (1.0–15 ng/mL).
  • Assessment of insulin content, beta-cell proliferation (MKI67 staining), and sulfonylurea receptor expression.
  • In vivo studies using a Nonobese diabetic-severe combined immunodeficiency (NOD-SCID) mouse model with human islet grafts.
  • Systemic D-OC administration (4.5 ng/h) and analysis of human insulin and C-peptide production.
  • Laser scanning cytometry for beta-cell and alpha-cell quantification in grafts.

Main Results:

  • D-OC significantly increased insulin content and beta-cell proliferation in cultured human islets.
  • Elevated sulfonylurea receptor protein expression indicated enhanced beta-cell differentiation.
  • In vivo, D-OC administration boosted human insulin and C-peptide production from grafted islets.
  • Histological analysis confirmed increased beta-cell mass due to proliferation and reduced alpha-cell numbers.

Conclusions:

  • D-OC effectively enhances human beta-cell function and proliferation in both in vitro and in vivo models.
  • D-OC treatment leads to increased beta-cell mass and improved insulin secretion.
  • These findings support the potential of D-OC as a therapeutic agent for diabetes treatment.