Cytotoxic effects of cytokines on human pancreatic islet cells in monolayer culture

J Clin Endocrinol Metab. 1990 Jul;71(1):152-6. doi: 10.1210/jcem-71-1-152.

Abstract

Interleukin-1 (IL-1), tumor necrosis factor (TNF), and interferon-gamma (IFN gamma) inhibit insulin release and may be cytotoxic to isolated rodent pancreatic islets. In this study we examined the effects of IL-1, TNF, and IFN gamma on the viability and hormone secretion of islets isolated from adult human pancreas and maintained in monolayer culture. IL-1 and TNF were cytotoxic to the islet cells (20-30% cell lysis) in a 51Cr release cytotoxicity assay, and IFN gamma had only small effects (less than 10% lysis). Combination of maximally cytotoxic concentrations of IL-1 (10 U/mL) and TNF (10(3) U/mL) produced an additive cytotoxic effect. IFN gamma (10(3) U/mL) acted synergistically with IL-1 and TNF, and the three cytokines added together produced maximal islet cell lysis (46.4 +/- 4.3%). Assay of insulin and glucagon in the islet monolayers revealed that IL-1, TNF, and IFN gamma inhibited both B- and A-cell secretory functions; however, only IL-1 and TNF produced permanent decreases in insulin and glucagon contents in the islet cultures. These findings indicate that IL-1 and TNF, as single agents, are cytotoxic to human islet cells, and that this cytotoxicity can be amplified by combining the cytokines and/or adding IFN gamma. However, the lack of specificity for B-cells in vitro suggests that additional factors might be operative in vivo for the cytokine products of macrophages and lymphocytes infiltrating islets to produce the B-cell-specific damage characteristic of type 1 diabetes.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Biological Factors / pharmacology*
  • Cells, Cultured
  • Cytokines
  • Dose-Response Relationship, Drug
  • Drug Synergism
  • Glucagon / metabolism
  • Humans
  • Insulin / metabolism
  • Interferon-gamma / pharmacology
  • Interleukin-1 / pharmacology
  • Islets of Langerhans / drug effects*
  • Islets of Langerhans / metabolism
  • Secretory Rate / drug effects
  • Tumor Necrosis Factor-alpha / pharmacology

Substances

  • Biological Factors
  • Cytokines
  • Insulin
  • Interleukin-1
  • Tumor Necrosis Factor-alpha
  • Interferon-gamma
  • Glucagon