Figure 6

Incorporation of Lamin B3 from Xenopus eggs into the nuclei of permeabilized cells. (A) Detection of Lamin B3 (68 kDa) in Xenopus egg extract (Extract) by western blot in the presence (+) or absence (−) of anti-Xenopus Lamin B3. Beta actin was used as a loading control. M: size markers. The cropped blots came from the same gel and were analyzed with the same exposure times (Lamin B3:2 sec; beta actin: 1 min). (B) Nuclear import of Lamin B3 detected by immunofluorescence in permeabilized (Dig30) and non-permeabilized (Control) cells incubated for 60 min in the presence (+Extract) of Xenopus egg extract under energy supplementation at 25 °C. Lamin B3-positive cells presenting a detectable signal (from weak to strong staining) were observed. A high proportion of nuclei were labelled. Inset: magnification of one nucleus showing a strong labelling of the nuclear lamina. These pictures are representative of five independent replicates. Scale bar = 20 µm.