Pluripotent Stem Cells Hematopoietic Stem Cells (HSCs) flashcards

All 12 cards

1. Card 1

   Explain the key difference between totipotential and pluripotential stem cells based on their developmental capabilities.

   Totipotential stem cells, present in the first few hours after fertilization, are the most versatile and can develop into any human cell type. Pluripotential stem cells, found several days after fertilization, can develop into any cell type except they cannot form a fetus.

2. Card 2

   Describe the Monophyletic Theory of hematopoiesis and explain why it is significant.

   The Monophyletic Theory states that all blood cells are derived from a single hematopoietic stem cell. It is significant because it is the most widely accepted theory explaining the origin of all blood cells.

3. Card 3

   What are the defining characteristics of Noncommitted and Undifferentiated Hematopoietic Stem Cells (HSCs)?

   Noncommitted and Undifferentiated Hematopoietic Stem Cells arise from pluripotent stem cells and are mainly found in the bone marrow. They are multipotent, capable of self-renewal, and give rise to all mature blood cells of the hematopoietic system, possessing a high degree of proliferative capability while being morphologically unrecognizable.

4. Card 4

   Outline the full maturation pathway from Pluripotent Stem Cells to Mature Blood Cells, including all intermediate progenitor stages.

   The pathway is: Pluripotent Stem Cells -> Hematopoietic Stem Cells (HSCs) -> Multipotent Progenitors (MPPs) -> Oligopotent Progenitors (CMP and CLP) -> Lineage-Restricted Progenitors -> Lineage-Specific Precursor Cells -> Mature Blood Cells.

5. Card 5

   Compare and contrast the Multipotent Progenitors (MPPs) and Lineage-Committed (Oligopotent) Progenitors.

   Multipotent Progenitors (MPPs) arise from HSCs and can give rise to lineage-committed progenitors but are not capable of self-renewal. Lineage-Committed (Oligopotent) Progenitors, such as Common Myeloid Progenitors (CMPs) and Common Lymphoid Progenitors (CLPs), are descendants of stem cells that differentiate further into specific cell lineages.

6. Card 6

   Which of the following markers is characteristic of Hematopoietic Stem Cells (HSCs)?

   A

7. Card 7

   Explain the difference between Symmetric and Asymmetric Division in the context of HSCs.

   In symmetric division, an HSC divides into two identical daughter cells, both of which leave the stem cell pool and undergo differentiation. In asymmetric division, an HSC divides into two identical daughter cells, but one returns to the stem cell pool for self-renewal, while the other undergoes differentiation.

8. Card 8

   Describe the roles of cytokines in hematopoiesis.

   Cytokines, a group of specific glycoproteins, regulate the proliferation, differentiation, and maturation of hematopoietic precursor cells. Their roles include inhibiting apoptosis, stimulating cells to divide by decreasing the transit time from G0 to G1 of the cell cycle, and regulating cell differentiation into various cell lineages.

9. Card 9

   What is Erythropoietin (EPO), where is it primarily produced, and what is its main stimulus for production?

   Erythropoietin (EPO) is a lineage-specific glycoprotein hormone that stimulates the proliferation, growth, and differentiation of erythroid precursors. It is primarily produced by the peritubular interstitial cells of the kidney, and its production and secretion are stimulated by decreased oxygen availability in the kidneys.

10. Card 10

    Which of the following growth factors is primarily responsible for neutrophil differentiation and is frequently used to treat neutropenia?

    C

11. Card 11

    Explain the process of apoptosis in the context of hematopoietic cells.

    Apoptosis is programmed cell death, a natural physiological process that eliminates unwanted, abnormal, or harmful cells. In hematopoiesis, apoptosis is initiated when cells do not receive the appropriate cytokines necessary to prevent cell death.

12. Card 12

    Identify the primary regulator of platelet production and the key locations where it is produced.

    Thrombopoietin is the primary regulator of platelet production, stimulating the production and differentiation of megakaryocytic precursor cells. It is produced by the liver, kidney, marrow stroma, and other tissues.

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