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Stem Cell Niche

Stem Cell Niche

The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...

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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...

Maintenance of the ES Cell State

Maintenance of the ES Cell State

The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...

Renewal of Skin Epidermal Stem Cells

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After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
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Regulation of Hematopoietic Stem Cells

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...

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Related Experiment Video

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Identifying Cell Surface Markers of Primary Neural Stem and Progenitor Cells by Metabolic Labeling of Sialoglycan

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Small molecules in stem cell self-renewal and differentiation.

R C Schugar¹, P D Robbins, B M Deasy

¹Stem Cell Research Center, Children's Hospital of Pittsburgh, Pittsburgh, PA, USA.

|November 9, 2007

Summary

Small molecules are powerful tools in regenerative medicine, controlling stem cell self-renewal and differentiation. These compounds offer new therapeutic strategies by targeting key cellular pathways, similar to cancer treatments.

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Identifying Cell Surface Markers of Primary Neural Stem and Progenitor Cells by Metabolic Labeling of Sialoglycan

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Published on: September 7, 2019

Identification of Key Factors Regulating Self-renewal and Differentiation in EML Hematopoietic Precursor Cells by RNA-sequencing Analysis

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Published on: November 18, 2009

Area of Science:

Stem cell biology
Regenerative medicine
Chemical biology

Background:

Stem cells are crucial for treating disease and injury, with small molecules serving as key tools to guide their behavior.
Similarities between stem cells and cancer cells offer insights into controlling cell fates, leveraging existing small molecule cancer therapies.
Small molecules modulate critical cellular processes including differentiation, self-renewal, apoptosis, and DNA replication.

Purpose of the Study:

To review recent literature on small molecules influencing stem cell self-renewal and differentiation.
To highlight the role of small molecules in targeting specific signaling pathways (Wnt, Hedgehog, NF-kappaB) in stem cell research.
To explore the potential of small molecules in regenerative medicine and cancer differentiation therapy.

Main Methods:

Literature review of scientific publications.
Analysis of small molecules affecting stem cell behavior.
Focus on compounds modulating Wnt, Hedgehog, and NF-kappaB signaling pathways.

Main Results:

Small molecules effectively control stem cell self-renewal and differentiation.
Specific small molecules impact key developmental pathways like Wnt, Hedgehog, and NF-kappaB.
The study identifies promising small molecules for regenerative medicine applications.

Conclusions:

Small molecules are versatile chemical tools for manipulating stem cell fate in regenerative medicine.
Targeting signaling pathways with small molecules represents a viable strategy for therapeutic interventions.
Further research into small molecule-mediated stem cell control holds significant promise for future treatments.