Forced disruption of F-actin restores the insulinotropic effects of GIP.
A, representative membrane capacitance traces (left) from mouse β-cells infected with Adsh-scram (gray lines) or Adsh-p110γ (black lines), treated with GIP (100 nmol/liter, 1 h) and with 10 μmol/liter latrunculin B included in the patch pipette. At right is the average capacitance response over the course of the depolarization trains. B, glucose-stimulated insulin secretion in the presence of GIP (100 nmol/liter) and/or latrunculin B (10 μmol/liter) was measured from mouse islets treated overnight with either DMSO (open bars) or AS604850 (1 μmol/liter) (black bars). *, p < 0.05 as indicated.