Transitions between cellular states - Cell state transition in development

5 important questions on Transitions between cellular states - Cell state transition in development

Out of what is the inner cell mass of a blastocyst made?

Embryonic stem (ES) cells, which are pluripotent and give rise to all cell types in the embryo
  • Epiblast contributes to the embryo
  • Blastocyst contributes to muscle, blood, nerve, cardiac, liver, intestinal cells 

What are the differentiation potential of Stem cells?

  1. Totipotency: able to differentiate in all cell types, both embryonic (stem cells) and extra-embryonic (placenta)
  2. Pluripotency: able to differentiate in all cell lineage of the body (ES and PGS: geslachtcellen)
  3. Multipotency: multiple cells types of one lineage (endoderm, mesoderm, ectoderm)
  4. Unipotency: cells from one cell type only (neurones, gut cells, ...)

What are the therapeutic promises of stem cell research?

Stem cells can be used as therapy of diseases since it can be differentiate into any cell that the patient needs, BUT
  • immune system rejects "stranger" cells
  • Ethical argument to not use human embryo's for experiment/research
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What is the solution of embryonic stem cell use?

Patient derived induced pluripotent stem cells
  • the fibroblast cell comes out of the patient and is reprogrammed into an embryonic stem cell, so no immune reaction on iPS
  • ethic arguments are gone, because no embryo is used

What are the mechanism of iPS?

1. Nuclear reprogramming to pluripotency:
    • Nucleus out of oocyte (ovary) and the nucleus of a somatic cell (fibroblast) of the patient implanted in the oocyte
    • creates a blastocyst which has ES cells
    • somatic cells can be reprogrammed into embryonic state
2. Transcription-factor induced reprogramming to pluripotency

    • start with patient fibroblast
    • multiple TF used to transform the somatic cell into an induced pluripotent stem cell (iPS cell)

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