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the claim

Intercellular tight junctions are responsible for blood-brain barrier integrity.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
7 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Intercellular tight junctions are responsible for blood-brain barrier integrity?

Yes. Intercellular tight junctions are critical structural components that restrict paracellular flux and maintain the integrity of the blood-brain barrier. Multiple studies demonstrate that alterations or degradation of these tight junctions directly lead to increased barrier permeability.

Verdict: SUPPORTED · 7 sources for, 0 against · Last checked

The analysis

The retrieved literature overwhelmingly confirms that intercellular tight junctions, composed of proteins like claudins and ZO-1, form the seals between brain endothelial cells that are responsible for blood-brain barrier integrity. Pathological breakdown or pharmacological modulation of these junctions consistently correlates with changes in barrier permeability.

Evidence for · 7
Hyperhomocysteinemia increases permeability of the blood-brain barrier by NMDA receptor-dependent regulation of adherens and tight junctions
2011
The study demonstrates that disruption of tight junctions like claudin-5 increases blood-brain barrier permeability.
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Beard, R. S., Reynolds, J. J., & Bearden, S. E. (2011). Hyperhomocysteinemia increases permeability of the blood-brain barrier by NMDA receptor-dependent regulation of adherens and tight junctions. doi.org. https://doi.org/10.1182/blood-2011-02-338269

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More for · 6
Canonical Wnt Signaling Suppresses Brain Endothelial Cell Transcytosis to Maintain Blood-Brain Barrier Integrity
2025
The article notes that alterations to tight junction proteins such as Claudin-5 and ZO-1 are tied to blood-brain barrier maintenance.
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Maine, X. d. & Gu, C. (2025). Canonical Wnt Signaling Suppresses Brain Endothelial Cell Transcytosis to Maintain Blood-Brain Barrier Integrity. doi.org. https://doi.org/10.1101/2025.03.10.642437

Brain endothelial homeostasis in psychiatric disorders: mechanisms, evidence, and translational opportunities.
2026
The review highlights that claudins and other tight junction components determine paracellular permeability at the blood-brain barrier.
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M, Z., X, H., L, Y., & W, W. (2026). Brain endothelial homeostasis in psychiatric disorders: mechanisms, evidence, and translational opportunities.. doi.org. https://doi.org/10.3389/fncel.2026.1901256

Controlled Blood-Brain Barrier Modulation by a High-Affinity Claudin-5 Peptide Binder
2026
The research details how targeting claudin-5 tight junction complexes directly modulates paracellular permeability at the blood-brain barrier.
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A, B., M, T., G, A., A, P., AD, F., A, A., V, C., L, M., & F, B. (2026). Controlled Blood-Brain Barrier Modulation by a High-Affinity Claudin-5 Peptide Binder. doi.org. https://doi.org/10.64898/2026.09.12.751133

Caspase-3 dependent, induction of barrier dysfunction and hyperpermeability in blood-brain barrier endothelial cells.
2026
The paper shows that pro-inflammatory triggers cause blood-brain barrier hyperpermeability via the breakdown of tight junctions.
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H, A., RL, W., M, M., CA, S., C, C., G, S., DA, S., C, P., JH, H., & B, T. (2026). Caspase-3 dependent, induction of barrier dysfunction and hyperpermeability in blood-brain barrier endothelial cells.. doi.org. https://doi.org/10.1080/02699052.2026.2733592

Cell-to-Cell Signaling Networks at the Blood-Brain Barrier in Health and Disease.
2026
The review emphasizes the critical role of endothelial tight junction dynamics in governing blood-brain barrier integrity.
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JH, M. (2026). Cell-to-Cell Signaling Networks at the Blood-Brain Barrier in Health and Disease.. doi.org. https://doi.org/10.1161/atvbaha.126.324590

Setmelanotide alleviates diabetes-associated cognitive impairment by interrupting the binding of ICAM-1 and JIP1 in endothelial cells of the blood-brain barrier.
2026
The study reveals that damage to endothelial tight junctions is a key trigger for blood-brain barrier disruption and associated cognitive impairment.
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SD, W., X, W., YM, Z., B, H., KY, W., CJ, Y., HY, Z., H, L., XC, W., HP, W., AF, C., ZS, Z., CJ, Y., & XY, Z. (2026). Setmelanotide alleviates diabetes-associated cognitive impairment by interrupting the binding of ICAM-1 and JIP1 in endothelial cells of the blood-brain barrier.. doi.org. https://doi.org/10.1016/j.metabol.2026.156712

What does the evidence say?

The retrieved literature overwhelmingly confirms that intercellular tight junctions, composed of proteins like claudins and ZO-1, form the seals between brain endothelial cells that are responsible for blood-brain barrier integrity. Pathological breakdown or pharmacological modulation of these junctions consistently correlates with changes in barrier permeability.

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