These data suggest that beta-arrestin-dependent ERK signaling by the IGF-1R regulates cell cycle progression and may thus be an important regulator of the growth of normal and malignant cells.
However , the D - (6-14C) glucose oxidation rate , i.e. , the metabolism of glucose in the Krebs cycle , was reduced by about 65 % in rIL-1 beta exposed islets kept at 11.1 mM glucose and 46 % in islets cultured at 56 mM glucose.
Exposure of the nuclear fraction to rIL-1 beta (10 IU/ml) provoked DNA strand breaks and increased nuclear poly (ADP-ribose) synthetase activity (148.4 % , P (0.01).
Pretreatment with poly (ADP-ribose) synthetase inhibitors was found to protect against alloxan - or streptozotocin-induced decrease in proinsulin synthesis.