The kynurenine pathway in stem cell biology
Simon P Jones1, Gilles J Guillemin, Bruce J Brew
1St. Vincent's Centre for Applied Medical Research, The University of New South Wales, Sydney, Australia.
International Journal of Tryptophan Research : IJTR
|October 5, 2013
Summary
The kynurenine pathway (KP) regulates immune responses and is implicated in neuroinflammatory diseases. This review explores the KP's influence on stem cell biology and progenitor cell function, areas of growing research interest.
Area of Science:
- Immunology
- Neuroscience
- Stem Cell Biology
Background:
- The kynurenine pathway (KP) catabolizes tryptophan, impacting immune regulation.
- The KP is implicated in neuroinflammatory conditions like Alzheimer's and ALS.
- Stem cell biology and the KP are independently areas of significant research.
Purpose of the Study:
- To review the current understanding of the kynurenine pathway's role in stem cell biology.
- To explore the interaction between the kynurenine pathway and stem cell function.
- To highlight the relevance of this interaction for inflammatory diseases and stem cell therapies.
Main Methods:
- Systematic literature review.
- Analysis of existing research on the kynurenine pathway and stem cells.
- Synthesis of findings regarding KP's influence on stem cell behavior.
Main Results:
- The kynurenine pathway significantly influences stem cell biology.
- KP activity impacts the functional behavior of progenitor cells.
- Evidence suggests a critical interplay between KP and stem cell processes.
Conclusions:
- Understanding the kynurenine pathway's role in stem cells is crucial for advancing regenerative medicine.
- The KP's influence on stem cells has implications for treating inflammatory and neurodegenerative diseases.
- Further research is warranted to elucidate the mechanisms of KP-stem cell interactions for therapeutic applications.
Related Concept Videos
Regulation of Hematopoietic Stem Cells
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...
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...
Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Biosynthesis of Nucleic Acids
Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
Multipotency of Hematopoietic Stem Cells
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...
Amino Acid Biosynthetic Pathways
Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...


