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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Cell adhesion proteins help cells attach to one another or to the extracellular matrix, the material surrounding cells. These connections give tissues structural strength and can influence cell signaling and behavior. They are not all communication channels: direct exchange of small molecules and ions between neighboring cells occurs through gap junctions, a distinct type of junction.
How cell adhesion supports tissue structure
Cells make selective connections using several protein families. Cadherins and integrins are central examples: cadherins support attachment between neighboring cells, while integrins connect cells to the extracellular matrix. These attachments help organize tissues and link the outside of a cell to structures and signaling systems inside it. The NCBI Bookshelf overview of cell-cell interactions and its chapter on cell-cell adhesion describe these families and their roles.
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Cadherins connect neighboring cells
Cadherins bind across the space between adjacent cells. Their interactions depend on calcium, and effective adhesion also requires intracellular anchor proteins that connect cadherins to the cytoskeleton. The cytoskeleton is the internal framework that helps cells maintain shape and bear force. This combination of an outside-to-outside bond and an inside anchor helps make cell-cell contacts mechanically useful.
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Integrins attach cells to the extracellular matrix
Integrins are receptors that bind components of the extracellular matrix outside the cell. Inside, they connect indirectly to the cytoskeleton through anchor or adaptor proteins rather than attaching to it in every case directly. Proteins identified at integrin adhesions include talin, alpha-actinin, filamin, and vinculin. These contacts provide a physical link between a cell and its surroundings.
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How adhesion proteins can affect cell behavior
Adhesion is more than physical fastening. Adhesion receptors and their connections to the cytoskeleton can help organize signaling inside a cell, influencing processes such as proliferation, survival, differentiation, and migration. The 2002 review by R. L. Juliano discusses this broad relationship between adhesion receptors, the cytoskeleton, and signal transduction: Signal transduction by cell adhesion receptors and the cytoskeleton.
The key distinction is that adhesion can influence signaling without serving as a passageway between cells. A receptor’s role in organizing information inside a cell is different from a junction that lets material move directly from one cell to another.
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How adhesion families differ
Cadherins, integrins, selectins, and immunoglobulin-superfamily adhesion molecules are major families, but they do not all bind the same partners or support the same kinds of contact.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minute| Family | Typical binding partner | Role or example |
|---|---|---|
| Cadherins | Cadherins on neighboring cells | Support cell-cell adhesion; calcium-dependent interactions and intracellular anchoring help stabilize contacts. |
| Integrins | Extracellular-matrix components; some integrins also bind cell-surface partners | Connect cells to the matrix and link those contacts indirectly to internal structures. |
| Selectins | Specific carbohydrates on another cell | Support transient cell-cell interactions in the bloodstream, unlike the more stable contacts commonly associated with cadherins. |
| Immunoglobulin-superfamily adhesion molecules | Varies by molecule; some interactions are calcium-independent | N-CAM is an example. ICAMs can bind integrins on blood cells during cell migration. |
These are broad functional distinctions, not rules that make every interaction in a family identical. The NCBI Bookshelf adhesion chapter discusses these families and examples.
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What the different cell junctions do
Cell junctions are commonly grouped by function: they can seal spaces between cells, mechanically anchor cells, or allow direct communication. The NCBI Bookshelf chapter on cell junctions distinguishes these roles.
- Tight junctions are occluding junctions that help create barriers in epithelial tissues.
- Adherens junctions and desmosomes are cell-cell anchoring junctions that contribute to mechanical connections.
- Focal adhesions and hemidesmosomes anchor cells to the extracellular matrix.
- Gap junctions are communicating junctions that allow small molecules and ions to pass directly between adjacent cells.
Gap junctions are therefore the relevant example when the question is how neighboring cells exchange certain substances directly. Adhesion proteins support attachment and can affect signaling, but it is inaccurate to describe all of them as channels between cells.
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What the integrin count does—and does not—tell you
A 2023 review of cell adhesion molecules in fibrotic diseases reports 18 integrin alpha subunits and eight beta subunits that can form 24 distinct integrins. This is the catalog reported by that review, not a newly verified 2026 count. The figure illustrates that integrins are a diverse receptor family; it does not mean every cell uses all 24 combinations. See Cell Adhesion Molecules in Fibrotic Diseases.
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