SCREENING

How a chip ranks drugs

A compound is added to the blood channel, and the amount that reaches the brain channel is measured over time. Results are compared with benchmark drugs that are known to cross, and known to be blocked, in people.

Benchmarks turn a number into a judgment.

BENCHMARKS

Does the model rank drugs sensibly?

A good model lets caffeine cross easily, holds back fluorescein, and blocks a plain antibody almost completely. The chart is illustrative, not measured data.

If the ranking looks wrong, the model is not ready.

DELIVERY STRATEGIES

Testing a way across

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Shuttles

An antibody that binds a receptor such as the transferrin receptor can carry a drug across. Chips test whether it really does

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Nanoparticles

Particles can be coated with ligands, and chips show whether they cross intact

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Opening

Chips can model how ultrasound or other signals loosen the barrier, and how it recovers

A fair test compares the shuttle against the same drug without one.

DISEASE MODELS

When the barrier itself is sick

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Neurodegeneration

Chips explore how disease-linked proteins and inflammation affect barrier cells

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Stroke

Low oxygen and glucose can loosen junctions, and chips can mimic those conditions

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Genetic disorders

Cells carrying a patient's mutation can reveal barrier defects

The barrier is not only a hurdle for drugs. It is itself a target.

PERSONALIZED

A chip made from one person's cells

Because iPSCs can be made from a patient, a chip can be built from that person's own genetic background. In 2019 a team reported chips from patient-derived cells in genetic neurological disorders that showed barrier differences. This is still research, not routine care.

A chip could one day help match a treatment to a person.

UNIT 16 STUDY COMPLETE

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Ready for the Fab Challenge?

You've seen how a barrier chip ranks drugs, tests delivery strategies, and models disease.