P38alpha-selective Mitogen-Activated Protein Kinase Inhibitor for Improvement of Cultured Human Islet Recovery

Pancreas. 2010 May;39(4):436-43. doi: 10.1097/MPA.0b013e3181c0dd8f.

Abstract

Objectives: We investigated whether the recovery of cultured human islets is improved through the addition of a p38alpha-selective mitogen-activated protein kinase inhibitor, SD-282, to clinically used serum-free culture medium.

Methods: Immediately after isolation, islets were cultured for 24 hours in medium alone (control) or medium containing dimethyl sulfoxide, 0.1 microM SD-282, or 0.3 microM SD-282. Cytokine expression, apoptotic beta-cell percentage, and islet function were assessed postculture.

Results: Expression of p38 and phosphorylated p38 in islets increased during culture. Interleukin 6 mRNA expression in cultured islets, as well as IL-6, IL-8, and granulocyte-macrophage colony-stimulating factor released into the medium, was significantly reduced by adding SD-282. The apoptotic beta-cell percentage was significantly lower in islets cultured with 0.1 microM SD-282, but not 0.3 microM, as compared with the control. Stimulation indices measured in vitro were higher but without significance (P = 0.06); the function of transplanted islets in diabetic NOD-scid mice was also better in 0.1-microM SD-282 group as compared with control.

Conclusions: Better islet function was obtained by adding 0.1 microM SD-282 to the serum-free culture medium. This improvement was associated with suppression of cytokine production and prevention of beta-cell apoptosis. However, this beneficial effect was diminished at a higher concentration.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis / drug effects
  • Blotting, Western
  • Dose-Response Relationship, Drug
  • Glucose / pharmacology
  • Graft Survival
  • Granulocyte-Macrophage Colony-Stimulating Factor / metabolism
  • HSP27 Heat-Shock Proteins / metabolism
  • Humans
  • Indoles / pharmacology*
  • Interleukin-6 / genetics
  • Interleukin-6 / metabolism
  • Interleukin-8 / genetics
  • Interleukin-8 / metabolism
  • Islets of Langerhans / drug effects*
  • Islets of Langerhans / metabolism
  • Islets of Langerhans Transplantation / methods*
  • Mice
  • Mice, Inbred NOD
  • Mice, SCID
  • Organ Culture Techniques
  • Phosphorylation / drug effects
  • Reverse Transcriptase Polymerase Chain Reaction
  • Time Factors
  • p38 Mitogen-Activated Protein Kinases / antagonists & inhibitors*

Substances

  • HSP27 Heat-Shock Proteins
  • Indoles
  • Interleukin-6
  • Interleukin-8
  • indole-5-carboxamide
  • Granulocyte-Macrophage Colony-Stimulating Factor
  • p38 Mitogen-Activated Protein Kinases
  • Glucose