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Neurogenesis and Regeneration of Nervous Tissue01:15

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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood 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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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
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Regenerative Medicine for the Aging Brain.

Micaela Lopez-Leon, Paula C Reggiani, Claudia B Herenu

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    Summary
    This summary is machine-generated.

    Cell reprogramming offers new hope for neurodegenerative diseases like Alzheimer's and Parkinson's by directly converting cells, bypassing risks associated with induced pluripotent stem cells (iPSCs). This approach aims to regenerate vital brain cells lost to aging and disease.

    Keywords:
    AlzheimerParkinsonbrain agingcell reprogrammingdirect reprogrammingiPSCsneurodegenerationregenerative medicinetransdifferentiation

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    Area of Science:

    • Neuroscience
    • Regenerative Medicine
    • Cell Biology

    Background:

    • Cholinergic and dopaminergic (DA) neurons in the central nervous system are vulnerable to aging and neurodegenerative diseases like Alzheimer's (AD) and Parkinson's (PD).
    • Aging causes neurodegeneration in the basal forebrain cholinergic system and nigro-striatal DA neurons, leading to AD and PD respectively.
    • Cell reprogramming, including induced pluripotent stem cells (iPSCs), offers therapeutic potential but carries risks like tumorigenicity.

    Purpose of the Study:

    • To review novel cell reprogramming strategies for treating neurodegenerative diseases.
    • To explore alternatives to iPSC-based therapies that bypass the pluripotent state.
    • To highlight the potential of direct and lineage reprogramming for regenerating specific neuronal types.

    Main Methods:

    • Review of existing literature on cell reprogramming techniques.
    • Discussion of induced pluripotent stem cells (iPSCs) and their limitations.
    • Analysis of lineage reprogramming and direct reprogramming methods.

    Main Results:

    • Direct reprogramming and lineage reprogramming bypass the pluripotent stem cell stage, reducing tumorigenic risk.
    • These methods allow for the direct conversion of adult cells into desired cell types.
    • Direct reprogramming can generate rejuvenated multipotent progenitor cells.

    Conclusions:

    • Direct and lineage reprogramming offer promising therapeutic avenues for neurodegenerative diseases.
    • These approaches hold potential for regenerating lost dopaminergic (DA) and cholinergic neurons.
    • Cell reprogramming provides a novel strategy for treating conditions like Parkinson's disease and Alzheimer's disease.