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Adult Stem Cells01:33

Adult Stem Cells

Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously renew...
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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
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The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
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Updated: May 13, 2026

Efficient Derivation of Human Cardiac Precursors and Cardiomyocytes from Pluripotent Human Embryonic Stem Cells with Small Molecule Induction
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Los cardiomiocitos derivados de las células madre demuestran un potencial arritmico potencial.

Ying Ming Zhang1, Criss Hartzell, Michael Narlow

  • 1Department of Medicine, Emory University, Atlanta, Ga 30033, USA.

Circulation
|September 5, 2002
PubMed
Resumen

Las células madre embrionarias (ESC) y las células de carcinoma embrionario (ECC) diferenciadas en cardiomiocitos exhiben propiedades aritmogénicas, incluida la actividad espontánea y las arritmias desencadenadas, por lo que se advierte contra su uso en terapia celular.

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Área de la Ciencia:

  • Cardiología Cardiología.
  • Biología de las células madre Biología de las células madre
  • Electrofisiología y electrofisiología.

Sus antecedentes:

  • Los cardiomiocitos (CMs) derivados de células madre embrionarias (ESCs) y células de carcinoma embrionario (ECCs) poseen algunas, pero no todas, las características de los miocitos adultos.
  • Las ESC demuestran potencial de injerto en el miocardio dañado, lo que sugiere aplicaciones terapéuticas para la cardiomiopatía.
  • Las propiedades aritmogénicas de los CM derivados de ESC y ECC requieren una investigación exhaustiva.

Objetivo del estudio:

  • Investigar el potencial aritmogénico de los cardiomiocitos diferenciados de las ECS y ECC de ratón.
  • Caracterizar las propiedades electrofisiológicas e identificar posibles mecanismos de arritmia en estos CM derivados.

Principales métodos:

  • Se utilizaron grabaciones de pinzas de parche de células enteras para estudiar los cardiomiocitos in vitro.
  • Se analizaron la morfología del potencial de acción (PA), la velocidad ascendente (dV/dt) y la duración de la PA.
  • Se emplearon agentes farmacológicos y manipulaciones iónicas para inducir y evaluar la actividad desencadenada y las despolarizaciones posteriores.

Principales resultados:

  • Los CM derivados exhibieron una heterogeneidad significativa de la morfología de la AP, una reducción de los dV/dT máximos y una duración prolongada de la AP.
  • Se observó actividad eléctrica espontánea y actividad desencadenada frecuente en CMs cultivados.
  • Las despolarizaciones posteriores tempranas (EADs) fueron inducibles bajo diversas condiciones, incluida la estimulación farmacológica y los cambios iónicos.
  • Las despolarizaciones posteriores retardadas (DADs) fueron inducidas fácilmente por hipercalcemia o isoproterenol.

Conclusiones:

  • Los CM derivados de ESC y ECC se diferencian en al menos tres fenotipos distintos de AP.
  • Estos CM muestran actividad espontánea, deterioro de la dV/dt, duración prolongada de la AP y arritmias desencadenadas fácilmente inducibles.
  • Los hallazgos requieren precaución con respecto al uso de ESC en la terapia de trasplante celular debido a su potencial para inducir arritmias a través de la reentrada, la automatización o la actividad desencadenada.