Related Experiment Video

Updated: May 25, 2026

Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies
13:52

Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies

Published on: March 19, 2014

Functional differences between kindlin-1 and kindlin-2 in keratinocytes

Aditi Bandyopadhyay1, Gerson Rothschild, Sean Kim

  • 1College of Dental Medicine and Department of Dermatology, Columbia University, New York, NY 10032, USA.

Journal of Cell Science
|February 14, 2012
PubMed

Insights

Integrin-β1-null cells show defective spreading due to poor recruitment of kindlin-2 to focal adhesions, highlighting distinct kindlin functions in cell adhesion.

Area of Science:

  • Cell biology
  • Biochemistry
  • Dermatology

Background:

  • Integrins are crucial for cell adhesion and migration.
  • Keratinocytes utilize integrin αvβ6 for fibronectin binding when integrin β1 is absent.
  • Kindlins are known regulators of integrin function.

Purpose of the Study:

  • To investigate the role of kindlins in integrin-β1-null keratinocyte adhesion and spreading.
  • To determine the specific contribution of kindlin-1 and kindlin-2 to focal adhesion formation and cell morphology.

Main Methods:

  • Utilized integrin-β1-null keratinocytes and wild-type keratinocytes.
  • Employed rescue experiments with wild-type and chimeric integrin constructs.
  • Performed kindlin-2 knockdown experiments.
  • Analyzed focal adhesion formation and cell spreading.

Main Results:

  • Integrin-β1-null keratinocytes exhibit reduced fibronectin binding avidity and defective spreading.
  • Kindlin-2 recruitment to focal adhesions is essential for proper cell spreading.
  • Only kindlin-1, not kindlin-2, localizes to integrin-β6 adhesions in integrin-β1-null cells.
  • Kindlin-2 knockdown in wild-type cells impairs cell spreading despite kindlin-1 presence.

Conclusions:

  • Kindlin-2's efficient recruitment to focal adhesions is critical for keratinocyte spreading.
  • Differences in kindlin isoform association with integrins lead to distinct functional outcomes.
  • Homologous kindlins (kindlin-1 and kindlin-2) possess unique, non-redundant functions in regulating cell adhesion.

More Related Videos

Characterization of In Vitro Differentiation of Human Primary Keratinocytes by RNA-Seq Analysis07:29

Characterization of In Vitro Differentiation of Human Primary Keratinocytes by RNA-Seq Analysis

Published on: May 16, 2020

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein11:23

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein

Published on: June 30, 2019

Related Concept Videos

Cytoskeletal Linker Proteins - Plakins01:09

Cytoskeletal Linker Proteins - Plakins

Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
Types of Intermediate Filaments01:31

Types of Intermediate Filaments

The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
Cells of the Epidermis01:24

Cells of the Epidermis

The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
Selectins01:25

Selectins

Cell adhesion is  an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain, which...
Disassembly of Intermediate Filaments01:35

Disassembly 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...
Catenins01:23

Catenins

Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...