Video Experimental Relacionado
Updated: Jan 18, 2026
08:34
Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
Published on: June 3, 2016
15.7K
La desregulación de ADH1C es una respuesta clave a la hipoxia en el epitelio del colon
Maged Zeineldin1, Tianhao Bi1, Varuni Rastogi1
1Department of Pathology, Division of GI/Liver Pathology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
The American journal of pathology
|January 15, 2026
Resumen
Las células normales del colon desregulan la alcohol deshidrogenasa 1C (ADH1C) en condiciones de hipoxia para manejar las especies reactivas de oxígeno (ROS) y mantener la identidad, un proceso relevante para el cáncer colorrectal (CRC).
Área de la Ciencia:
- Biología Celular
- Gastroenterología
- Investigación sobre el Cáncer
Sus antecedentes:
- El cáncer colorrectal (CRC) a menudo implica hipoxia, sin embargo, las respuestas del epitelio del colon normal a los cambios de oxígeno son poco conocidas.
- La hipoxia fisiológica y la susceptibilidad a la lesión isquémica son características de la mucosa del colon.
Objetivo del estudio:
- Investigar las respuestas adaptativas de las células epiteliales normales del colon humano a la hipoxia sostenida.
- Identificar los mediadores moleculares de la adaptación del epitelio del colon a la hipoxia y su relevancia para el CRC.
Principales métodos:
- Se cultivaron organoides de colon humano (colonoides) en hipoxia sostenida.
- Se caracterizaron los cambios fenotípicos y transcripcionales.
- Se analizó la expresión de alcohol deshidrogenasa 1C (ADH1C) en colonoides y tejidos de pacientes de archivo.
Principales resultados:
- La hipoxia sostenida condujo a una fuerte desregulación de ADH1C en colonoides, validada en tejidos de colitis isquémica.
- La desregulación de ADH1C se relacionó con una reducción de las especies reactivas de oxígeno (ROS) y un aumento de NADPH en condiciones de hipoxia.
- La reducción de ADH1C inducida por la hipoxia alteró las firmas celulares, disminuyendo los marcadores de células de tránsito (TA) y aumentando el marcador de células madre FGFBP1.
- Los tejidos de cáncer colorrectal (CRC) con ADH1C bajo mostraron un enriquecimiento de firmas asociadas a la hipoxia en comparación con el CRC con ADH1C alto.
Conclusiones:
- La alcohol deshidrogenasa 1C (ADH1C) actúa como un mediador clave de las respuestas del epitelio del colon a la hipoxia.
- La desregulación de ADH1C facilita la neutralización de ROS e influye en la identidad de las células epiteliales durante la hipoxia.
- Estos hallazgos resaltan el papel de ADH1C en la adaptación del epitelio del colon y su importancia en el desarrollo del cáncer colorrectal.
Videos de Conceptos Relacionados
01:24Regulation of Angiogenesis and Blood Supply
3.3K
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
3.3K
01:23Hypoxia
2.0K
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
2.0K
01:12Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.4K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
2.4K
02:53Adaptive Mechanisms in Cancer Cells
7.0K
Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
7.0K