administered an intraperitoneal (IP) injection of D-glucose (3 g/kg body
weight). Blood glucose levels were measured with a Contour glucometer (Bayer) at
0, 5, 15, 30, 45, 60, 90, and 120 minutes post injection and EDTA-treated plasma
samples were collected for insulin hormone assays at the same time intervals.
5–7 month-old male GKO-NSG, GKO-NSG Tx, and
NSG littermate control mice were used. For circulating
GLP-1 assessment, mice were fasted for 6 hours (starting at 9AM), then D-glucose
(6 g/ kg body weight) was given by oral gavage. Blood glucose was measured with
a Contour glucometer (Bayer) at 0, 5, 15, 30, 60, 90, 120, and 180 minutes
post-gavage and EDTA-, DPP4-inibitor- (Millipore), and HALT protease inhibitor-
(Thermo Scientific) treated plasma samples were collected at 0, 15, and 30
minutes post-gavage. 2.5–3 month-old male and female
GKO-NSG and NSG littermate control mice
were used.