CD40 activation in human pancreatic islets and ductal cells

D. Klein, F. Timoneri, H. Ichii, Camillo Ricordi, Ricardo Pastori

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Aims/hypothesis: CD40 expression on non-haematopoietic cells is linked to inflammation. We previously reported that CD40 is expressed on isolated human and non-human primate islets and its activation results in secretion of IL-8, macrophage inflammatory protein 1-beta (MIP-1β) and monocyte chemoattractant protein-1 (MCP-1) through nuclear factor-κB and extracellularly regulated kinases 1/2 pathways. The objective of this study was to identify the pattern of gene expression, and to study viability and functionality affected by CD40-CD40 ligand (CD40L) interaction in human islets. Furthermore, we have studied the CD40-mediated cytokine/chemokine profile in pancreatic ductal cells, as they are always present in human islet transplant preparations and express CD40 constitutively. Methods: CD40-CD40L gene expression modulation was studied by microarray on islet cells depleted of ductal cells. Selected genes were validated by quantitative RT-PCR. The cytokine profile in purified ductal cells was evaluated by Luminex technology, based on the use of fluorescent-coated beads, known as microspheres, and capable of multiplex detection of proteins from a single sample. Glucose-stimulated insulin secretion and islet viability were assessed by perifusion and 7-aminoactinomycin D membrane exclusion, respectively. Results: Statistical analysis of microarrays identified 30 genes exhibiting at least a 2.5-fold increase across all replicate arrays. The majority of them were related to oxidative stress/inflammation. Prominently upregulated were chemokine C-X-C motif ligand 1 (CXCL1), CXCL2 and CXCL3 belonging to the CXC family of chemokines related to IL-8. CD40-mediated CXCL1 secretion was confirmed by ELISA. The viability or in vitro function was not affected by CD40 activation. In addition to previously reported IL-8, MIP-1β and MCP-1, CD40 stimulation in ductal cells produced IL-1β, IFN-γ, TNF-α, granulocyte colony-stimulating factor and granulocyte-macrophage colony-stimulating factor. Conclusions/interpretation: CD40 activation in islets and ductal cells produces cytokines/chemokines with a broad-spectrum range of biological functions.

Original languageEnglish
Pages (from-to)1853-1861
Number of pages9
JournalDiabetologia
Volume51
Issue number10
DOIs
StatePublished - Oct 1 2008

Fingerprint

Islets of Langerhans
Interleukin-8
Chemokine CCL4
CD40 Ligand
Chemokine CCL2
Cytokines
Chemokines
Chemokine CXCL1
Inflammation
Gene Expression
CXC Chemokines
Granulocyte Colony-Stimulating Factor
Microarray Analysis
Granulocyte-Macrophage Colony-Stimulating Factor
Interleukin-1
Microspheres
Primates
Genes
Oxidative Stress
Phosphotransferases

Keywords

  • CD40
  • Chemokines
  • Cytokines
  • Ductal cells
  • Inflammation
  • Insulin
  • Islets of Langerhans
  • Microarray
  • Quantitative RT-PCR

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

Cite this

CD40 activation in human pancreatic islets and ductal cells. / Klein, D.; Timoneri, F.; Ichii, H.; Ricordi, Camillo; Pastori, Ricardo.

In: Diabetologia, Vol. 51, No. 10, 01.10.2008, p. 1853-1861.

Research output: Contribution to journalArticle

Klein, D. ; Timoneri, F. ; Ichii, H. ; Ricordi, Camillo ; Pastori, Ricardo. / CD40 activation in human pancreatic islets and ductal cells. In: Diabetologia. 2008 ; Vol. 51, No. 10. pp. 1853-1861.
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