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J Endocrinol. 2014 Oct;223(1):67-78. doi: 10.1530/JOE-14-0222. Epub 2014 Aug 13.

Gastrin induces ductal cell dedifferentiation and β-cell neogenesis after 90% pancreatectomy.

Author information

1
CIBER of Diabetes and Metabolic DiseasesCIBERDEM, Barcelona, SpainBellvitge Biomedical Research InstituteIDIBELL, L'Hospitalet de Llobregat, Barcelona, SpainEndocrine UnitHospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, SpainDepartment of Clinical SciencesUniversity of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain CIBER of Diabetes and Metabolic DiseasesCIBERDEM, Barcelona, SpainBellvitge Biomedical Research InstituteIDIBELL, L'Hospitalet de Llobregat, Barcelona, SpainEndocrine UnitHospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, SpainDepartment of Clinical SciencesUniversity of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain CIBER of Diabetes and Metabolic DiseasesCIBERDEM, Barcelona, SpainBellvitge Biomedical Research InstituteIDIBELL, L'Hospitalet de Llobregat, Barcelona, SpainEndocrine UnitHospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, SpainDepartment of Clinical SciencesUniversity of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain ntellez@ub.edu.
2
CIBER of Diabetes and Metabolic DiseasesCIBERDEM, Barcelona, SpainBellvitge Biomedical Research InstituteIDIBELL, L'Hospitalet de Llobregat, Barcelona, SpainEndocrine UnitHospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, SpainDepartment of Clinical SciencesUniversity of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain CIBER of Diabetes and Metabolic DiseasesCIBERDEM, Barcelona, SpainBellvitge Biomedical Research InstituteIDIBELL, L'Hospitalet de Llobregat, Barcelona, SpainEndocrine UnitHospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, SpainDepartment of Clinical SciencesUniversity of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain CIBER of Diabetes and Metabolic DiseasesCIBERDEM, Barcelona, SpainBellvitge Biomedical Research InstituteIDIBELL, L'Hospitalet de Llobregat, Barcelona, SpainEndocrine UnitHospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, SpainDepartment of Clinical SciencesUniversity of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain CIBER of Diabetes and Metabolic DiseasesCIBERDEM, Barcelona, SpainBellvitge Biomedical Research InstituteIDIBELL, L'Hospitalet de Llobregat, Barcelona, SpainEndocrine UnitHospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, SpainDepartment of Clinical SciencesUniversity of Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain.

Abstract

Induction of β-cell mass regeneration is a potentially curative treatment for diabetes. We have recently found that long-term gastrin treatment results in improved metabolic control and β-cell mass expansion in 95% pancreatectomised (Px) rats. In this study, we investigated the underlying mechanisms of gastrin-induced β-cell mass expansion after Px. After 90%-Px, rats were treated with gastrin (Px+G) or vehicle (Px+V), pancreatic remnants were harvested on days 1, 3, 5, 7, and 14 and used for gene expression, protein immunolocalisation and morphometric analyses. Gastrin- and vehicle-treated Px rats showed similar blood glucose levels throughout the study. Initially, after Px, focal areas of regeneration, showing mesenchymal cells surrounding ductal structures that expressed the cholecystokinin B receptor, were identified. These focal areas of regeneration were similar in size and cell composition in the Px+G and Px+V groups. However, in the Px+G group, the ductal structures showed lower levels of keratin 20 and β-catenin (indicative of duct dedifferentiation) and higher levels of expression of neurogenin 3 and NKX6-1 (indicative of endocrine progenitor phenotype), as compared with Px+V rats. In Px+G rats, β-cell mass and the number of scattered β-cells were significantly increased compared with Px+V rats, whereas β-cell replication and apoptosis were similar in the two groups. These results indicate that gastrin treatment-enhanced dedifferentiation and reprogramming of regenerative ductal cells in Px rats, increased β-cell neogenesis and fostered β-cell mass expansion.

KEYWORDS:

dedifferentiation; diabetes; duct; gastrin; neogenesis; β cell mass

PMID:
25122000
DOI:
10.1530/JOE-14-0222
[Indexed for MEDLINE]

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