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2016 ; 5
(ä): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Blockade of glucagon signaling prevents or reverses diabetes onset only if
residual ?-cells persist
#MMPMID27092792
Damond N
; Thorel F
; Moyers JS
; Charron MJ
; Vuguin PM
; Powers AC
; Herrera PL
Elife
2016[Apr]; 5
(ä): ä PMID27092792
show ga
Glucagon secretion dysregulation in diabetes fosters hyperglycemia. Recent
studies report that mice lacking glucagon receptor (Gcgr(-/-)) do not develop
diabetes following streptozotocin (STZ)-mediated ablation of insulin-producing
?-cells. Here, we show that diabetes prevention in STZ-treated Gcgr(-/-) animals
requires remnant insulin action originating from spared residual ?-cells: these
mice indeed became hyperglycemic after insulin receptor blockade. Accordingly,
Gcgr(-/-) mice developed hyperglycemia after induction of a more complete,
diphtheria toxin (DT)-induced ?-cell loss, a situation of near-absolute insulin
deficiency similar to type 1 diabetes. In addition, glucagon deficiency did not
impair the natural capacity of ?-cells to reprogram into insulin production after
extreme ?-cell loss. ?-to-?-cell conversion was improved in Gcgr(-/-) mice as a
consequence of ?-cell hyperplasia. Collectively, these results indicate that
glucagon antagonism could i) be a useful adjuvant therapy in diabetes only when
residual insulin action persists, and ii) help devising future ?-cell
regeneration therapies relying upon ?-cell reprogramming.