Influence of Lamin A on the Mechanical Properties of Amphibian Oocyte Nuclei Measured by Atomic Force Microscopy

AUTOR(ES)

Schäpe, Jens

FONTE

The Biophysical Society

RESUMO

The nuclear lamina is part of the nuclear envelope (NE). Lamin filaments provide the nucleus with mechanical stability and are involved in many nuclear activities. The functional importance of these proteins is highlighted by mutations in lamin genes, which cause a variety of human diseases (laminopathies). Here we describe a method that allows one to quantify the contribution of lamin A protein to the mechanical properties of the NE. Lamin A is ectopically expressed in Xenopus oocytes, where it is incorporated into the NE of the oocyte nucleus, giving rise to a prominent lamina layer at the inner nuclear membrane. Nuclei are then isolated and probed by atomic force microscopy. From the resulting force curves, stiffness values are calculated and compared with those of control nuclei. Expression of lamin A significantly increases the stiffness of oocyte nuclei in a concentration-dependent manner. Since chromatin adds negligibly to nuclear mechanics in these giant nuclei, this method allows one to measure the contribution of individual NE components to nuclear mechanics.

Documentos Relacionados

• Changes in the Elastic Properties of Cholinergic Synaptic Vesicles as Measured by Atomic Force Microscopy
• Atomic force microscopy reveals the mechanical design of a modular protein
• Thickness and Elasticity of Gram-Negative Murein Sacculi Measured by Atomic Force Microscopy
• Combining constitutive materials modeling with atomic force microscopy to understand the mechanical properties of living cells
• Kinetics of the Multistep Rupture of Fibrin ‘A-a’ Polymerization Interactions Measured Using Atomic Force Microscopy