par Nollevaux, M-C;Rahier, J;Marchandise, J.;Thurion, P;Godecharles, S;Van Den Steen, Géraldine 
;Jamart, J;Sempoux, C;Jacquemin, P;Guiot, Yves
Référence American journal of physiology: endocrinology and metabolism, 304, 7, page (E711-E723)
Publication Publié, 2013-04
;Jamart, J;Sempoux, C;Jacquemin, P;Guiot, YvesRéférence American journal of physiology: endocrinology and metabolism, 304, 7, page (E711-E723)
Publication Publié, 2013-04
Article révisé par les pairs
| Résumé : | β-Cell plasticity governs the adjustment of β-cell mass and function to ensure normoglycemia. The study of how β-cell mass is controlled and the identification of alternative sources of β-cells are active fields of research. β-Cell plasticity has been implicated in numerous physiological and pathological conditions. We developed a mice model in which we induced major β-cell mass atrophy by implanting insulin pellets (IPI) for 7 or 10 days. The implants were then removed (IPR) to observe the timing and characteristics of β-cell regeneration in parallel to changes in glycemia. Following IPR, the endocrine mass was reduced by 60% at day 7 and by 75% at day 10, and transient hyperglycemia was observed, which resolved within 1 wk. Five days after IPR, enhanced β-cell proliferation and an increased frequency of small islets were observed in 7-day IPI mice. β-Cell mass was fully restored after an additional 2 days. For the 10-day IPI group, β-cell and endocrine mass were no longer significantly different from those of the control group at 2 wk post-IPR. Furthermore, real-time quantitative PCR analysis of endocrine structures isolated by laser capture microdissection indicated sequentially enhanced expression of the pancreatic transcription factors β(2)/NeuroD and Pdx-1 post-IPR. Thus, our data suggest this mouse model of β-cell plasticity not only relies on replication but also involves enhanced cell differentiation plasticity. |
