Related Experiment Video
Updated: Jun 27, 2026
06:23
Detection of Nuclear Blebbing and DNA Leakage in Mammalian Cells by Immunofluorescence
Published on: January 17, 2025
Disturbed nuclear orientation and cellular migration in A-type lamin deficient cells
F Houben1, C H M P Willems, I L J Declercq
1Department of Molecular Cell Biology (Box 17), School for Cardiovascular Diseases (CARIM), Maastricht University, P.O. Box 616, NL-6200 MD Maastricht, The Netherlands. frederik.houben@molcelb.unimaas.nl
Biochimica Et Biophysica Acta
|November 18, 2008
Summary
A-type lamins are crucial for cell mechanics and directional movement. Their absence disrupts the nucleus-cytoskeleton connection, impairing cell migration and reorientation.
Area of Science:
- Cell Biology
- Biophysics
- Cytoskeletal Dynamics
Background:
- The nuclear lamina and cytoskeleton form an integrated cellular structure essential for mechanical function.
- A-type lamins are key components of the nuclear lamina, influencing nuclear shape and mechanical properties.
Purpose of the Study:
- To investigate the correlation between structural alterations in A-type lamins and fibroblast migrational behavior.
- To elucidate the role of A-type lamins in maintaining the nucleus-cytoskeleton connection and cellular mechanical integrity.
Main Methods:
- Studied fibroblasts with and without A-type lamins (lmna-/-).
- Utilized in vitro wound healing assays to assess cell migration.
- Employed RNA interference (RNAi) in a 3T3 cell line to stably reduce lmna expression.
- Analyzed nuclear reorientation, microtubule-organizing center (MTOC) dynamics, and nuclear rotation during migration.
Main Results:
- Loss of A-type lamins led to reduced emerin and nesprin-3 at the nuclear envelope.
- A-type lamin-deficient cells exhibited a disturbed nucleus-cytoskeleton connection.
- Impaired cell migration characterized by delayed nuclear and MTOC reorientation and loss of nuclear oscillatory rotation.
- Findings consistent in primary fibroblasts and RNAi-treated 3T3 cells.
Conclusions:
- A-type lamins are vital for maintaining directional cell movement coordinated by the cytoskeleton.
- The absence of A-type lamins significantly impacts cellular mechanical function and migratory capacity.
- These karyoskeletal proteins are essential for the cell's role as a cohesive mechanical entity.
More Related Videos
Related Concept Videos
01:35Disassembly of Intermediate Filaments
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
00:55Laminins are the Adhesive Proteins of Basal Lamina
Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
01:31Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
01:09Cell Migration
Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
01:19Cell Migration
Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
01:32Cytoskeletal Coordination in Cell Migration
A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...