Killers in Your Body! (Color)
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Thymic Selection: Training T Cells for Self-Tolerance and Adaptive Immunity
Master the rigorous two-stage selection process occurring in the thymus that turns naive precursors into effective immune defenders. Understand the "Goldilocks model" that dictates whether a T cell lives, becomes specialized, or perishes to prevent autoimmunity.
Short Summary
- T cell precursors mature from double-negative to double-positive stages based on environmental signals within the thymic cortex.
- Positive selection ensures functionality by requiring moderate recognition of self-MHC molecules, while negative selection eliminates self-reactive cells via apoptosis.
- Thymic training determines if a cell becomes a CD4+ helper or a CD8+ killer, ultimately preventing the body from attacking its own healthy tissues.
This lecture details the journey of T cells from the bone marrow into the thymus, focusing specifically on positive and negative selection stages which are crucial checkpoints for developing adaptive immunity and establishing self-tolerance.
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Top Comments (10)
Dr. Bean! Fantastic use of your art to teach about T cells. Your representation of the bone marrow stem cells made me smirk and will be remembered. What a heroic, gladiator-like journey the precursors go through.
Thank you for a colorful explanation of Important T cells.
Read that Covid shrinks the thymus gland. Are people who have their thymus glands removed more at risk of cytokines storms?
This is excellent, thank you! Really clear explanation, and your drawings are fun as well as helpful. I feel this could be the basis for a Harry Potter type school story 😀
So what are the deficits or differences in immune process if a person has no thymus gland such as a person who had it removed?
Now I fully understand the concept of positive selection and negative selection. Thank you, Dr. Been for this wonderful illustration.
Brilliant explanation. You have made a complex subject very understandable. Thank you.
I like how you shorted the video by eliminating pauses between words.
Brilliant explanation thank you very much sir for enlightening in simple way
When is hypochlorous acid made
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Top Comments (10)
Dr. Bean! Fantastic use of your art to teach about T cells. Your representation of the bone marrow stem cells made me smirk and will be remembered. What a heroic, gladiator-like journey the precursors go through.
Thank you for a colorful explanation of Important T cells.
Read that Covid shrinks the thymus gland. Are people who have their thymus glands removed more at risk of cytokines storms?
This is excellent, thank you! Really clear explanation, and your drawings are fun as well as helpful. I feel this could be the basis for a Harry Potter type school story 😀
So what are the deficits or differences in immune process if a person has no thymus gland such as a person who had it removed?
Now I fully understand the concept of positive selection and negative selection. Thank you, Dr. Been for this wonderful illustration.
Brilliant explanation. You have made a complex subject very understandable. Thank you.
I like how you shorted the video by eliminating pauses between words.
Brilliant explanation thank you very much sir for enlightening in simple way
When is hypochlorous acid made