IB Biology Topic B2.3.3 Location and Function of Stem Cell Niches in Adult Humans Revision Notes (SL/HL)

IB Biology Topic B2.3.3 Location and Function of Stem Cell Niches in Adult Humans Revision Notes (SL/HL) | RevisionDojo

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Stem Cell Niches: The Microenvironments That Tell Stem Cells What to Do

Definition

Stem cell niche

A stem cell niche is a microenvironment within a tissue that supports stem cells by maintaining their self-renewal, survival, and differentiation potential.

Analogy

Imagine you cut your finger while slicing vegetables.
Over the next few days the wound heals and new skin forms seamlessly.
How does your body know to make new skin cells exactly where they are needed?
The answer lies in stem cell niches: specialised microenvironments that house and regulate stem cells.

What a Stem Cell Niche Does

A stem cell niche is a specific microenvironment within a tissue that provides the conditions needed to regulate stem cells.
Think of it as a control tower that decides whether stem cells stay inactive, self-renew, or differentiate into specialised cells.
The niche controls stem cells through three inputs:
1. Chemical signals: molecules like growth factors and cytokines influence stem cell behaviour.
2. Physical support: the extracellular matrix and neighbouring cells give structural and biochemical cues.
3. Cell-cell contact: direct contact with other cells helps keep stem cells active and ready.

Bone Marrow: The Niche That Makes Your Blood

The bone marrow, found in the hollow spaces of bones, is a stem cell niche that produces blood cells.
It houses haematopoietic stem cells (HSCs), multipotent stem cells that differentiate into red blood cells, white blood cells, and platelets.

Definition

Hematopoietic stem cells

Hematopoietic stem cells (HSCs) are immature cells that can develop into all types of blood cells.

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Definition

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Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Stem Cell Niches: The Microenvironments That Tell Stem Cells What to Do

Definition

Stem cell niche

A stem cell niche is a microenvironment within a tissue that supports stem cells by maintaining their self-renewal, survival, and differentiation potential.

Analogy

Imagine you cut your finger while slicing vegetables.
Over the next few days the wound heals and new skin forms seamlessly.
How does your body know to make new skin cells exactly where they are needed?
The answer lies in stem cell niches: specialised microenvironments that house and regulate stem cells.

What a Stem Cell Niche Does

A stem cell niche is a specific microenvironment within a tissue that provides the conditions needed to regulate stem cells.
Think of it as a control tower that decides whether stem cells stay inactive, self-renew, or differentiate into specialised cells.
The niche controls stem cells through three inputs:
1. Chemical signals: molecules like growth factors and cytokines influence stem cell behaviour.
2. Physical support: the extracellular matrix and neighbouring cells give structural and biochemical cues.
3. Cell-cell contact: direct contact with other cells helps keep stem cells active and ready.

Bone Marrow: The Niche That Makes Your Blood

The bone marrow, found in the hollow spaces of bones, is a stem cell niche that produces blood cells.
It houses haematopoietic stem cells (HSCs), multipotent stem cells that differentiate into red blood cells, white blood cells, and platelets.

Definition

Hematopoietic stem cells

Hematopoietic stem cells (HSCs) are immature cells that can develop into all types of blood cells.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B2.3.3: Location and Function of Stem Cell Niches in Adult Humans Notes

Stem Cell Niches: The Microenvironments That Tell Stem Cells What to Do

What a Stem Cell Niche Does

Bone Marrow: The Niche That Makes Your Blood

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Stem Cell Niches: The Microenvironments That Tell Stem Cells What to Do

What a Stem Cell Niche Does

Bone Marrow: The Niche That Makes Your Blood

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics