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MODULE 10: The Brain
PART 4 OF 7
Stina’s labs show chronically elevated IL-1β and IL-6 circulating in her blood — yet her brain is supposed to be sealed off from most of what flows past it. This page builds that seal.
Slide 1 Transcript
PATIENT CHART
STINA
THIS PART
Ages 45
PRESENTING WITH
Brain fog, pressureThe force exerted by gases in the respiratory system, affecting airflow and gas exchange. headache
TESTS ORDERED
MRI – found white matterThe outer portion of the spinal cord made of myelinated nerve fibers that transmit signals. hyperintensities
DIAGNOSIS
Neuroinflammatory White-Matter Injury
CHART CLUES
COLLECTED AS YOU GO
Age-Excessive White Matter Hyperintensities (WMH) on Brain MRI
Childhood Recurrent Fever Traced to the Hypothalamic Set-Point
Positional Pressure Headache — Intracranial Pressure / CSF Space
An Intact BBB Should Seal the Brain — Yet the Spots Appear
Chronic IL-1β/IL-6 Loosen BBB Tight Junctions — Microglia Activate
WMH + ‘Brain Fog’ Are One Finding — Neuroinflammatory White-Matter Injury
Chart Clue #10 — the Brain as Another Target Organ
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Story1
For most of her life, Stina’s inflammation was a story about blood — high cytokines, elevated markers, a body simmering. The brain seemed like it should be a bystander, walled off from the chemical storm in her circulation. And under normal conditions, it nearly is. The brain guards itself with a barrier so selective that most of what travels in the blood never gets in. Understanding that wall is the key to understanding how, in Stina, it failed.
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Slide 2 Transcript
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story2
The blood-brain barrierA selective barrier that prevents harmful substances from entering the brain. (BBB) is not a separate membrane but a property of the brain’s smallest blood vessels. Their endothelial cellsThe basic structural and functional units of life. are stitched together by tight junctions that seal the gaps between cells, blocking the casual leakage that other capillariesThe smallest blood vessels where gas, nutrient, and waste exchange occurs between blood and tissues. allow. The barrier is reinforced from outside: astrocyte end-feet wrap around the vessels, and pericytes embed in the wall, together signaling the endotheliumThe innermost layer of blood vessels, composed of simple squamous epithelial cells, which reduces fr to stay tight. The result is exquisitely selective — oxygen and glucoseA simple sugar that is the main source of energy for cells. are admitted (glucose via dedicated transporters), but large moleculesGroups of atoms bonded together., most drugs, pathogens, and inflammatory cells are normally excluded. This is why the brain is called “immune-privileged.”
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story3
For Stina, this wall is the difference between cytokines in the blood and cytokines in the brain — and the next page is the story of how chronic inflammation talks its way past the gate.
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Slide 7 Transcript
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FINDING!
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Slide 7 Transcript
NEXT PART
A wall is only as strong as its weakest junction — and chronic inflammation knows exactly where to push. Next: how Stina’s own cytokines pry the barrier open.
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All pages for Module 10 — The Brain & the Blood–Brain Barrier
10.0 Module Overview
10.1 Spots on the Scan
10.2 The Command Center
10.3 Cushions and Currents
10.4 The Wall
10.5 Breaching the Wall
10.6 White Matter Under Fire
10.7 Neuroinflammation
10.8 Conclusion and Assessment
10.9 Evidence Behind the Case
All Modules
- Anatomical Language, Membranes & Homeostasis
- Just Enough Chemistry
- The Cell & Its Transport
- Making Cells & Proteins
- The Integumentary System
- The Skeletal System
- The Muscular System
- Nervous Tissue & the Senses
- The Spinal Cord
- The Brain & the Blood–Brain Barrier
- The Autonomic Nervous System
- Special Senses (in developmentThe process of growth and differentiation.)
- The Endocrine System
- Blood
- The Heart
- Blood Vessels
- The Digestive System
- The Respiratory System
- The Urinary System
- Fluids, Electrolytes & Acid–Base Balance
- The Reproductive System
- The Immune System
List of terms
- pressure
- white matter
- blood-brain barrier
- cells
- capillaries
- endothelium
- glucose
- molecules
- development