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Related Concept Videos

Regulation of Hematopoietic Stem Cells01:01

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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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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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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...
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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Hematopoietic stem cell regulation by the proteostasis network.

Bernadette A Chua1, Robert A J Signer

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Hematopoietic stem cells (HSCs) uniquely regulate protein homeostasis (proteostasis) for longevity and function. Maintaining proteostasis is crucial for HSC health, regeneration, and preventing age-related decline.

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Area of Science:

  • Cellular Biology
  • Hematopoiesis
  • Molecular Biology

Background:

  • Protein homeostasis (proteostasis) is vital for cellular function and organismal health.
  • Dysregulation of proteostasis contributes to aging and disease.
  • Hematopoietic stem cells (HSCs) rely on precise proteostasis for their unique functions.

Purpose of the Study:

  • To review recent findings on the unique regulation of proteostasis within HSCs.
  • To highlight the importance of cell-type-specific proteostasis mechanisms in HSC maintenance and function.

Main Methods:

  • Literature review of recent studies on HSC proteostasis.
  • Analysis of cell-type-specific proteostasis mechanisms.
  • Integration of findings on proteostasis network configuration in HSCs.

Main Results:

  • The proteostasis network is regulated distinctly in HSCs compared to other hematopoietic progenitors.
  • Proteostasis disruptions are particularly damaging to HSC maintenance and function.
  • Unique cellular physiology in HSCs is critical for maintaining proteostasis.

Conclusions:

  • The proteostasis network is uniquely configured in HSCs to ensure their longevity and hematopoietic capacity.
  • Understanding cell-type-specific proteostasis is key to comprehending HSC function in health and disease.
  • Future research should focus on the specific differences in proteostasis network integration and function within HSCs.