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The Ras Gene02:38

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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a...
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Cell Signaling Feedback Loops01:07

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Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
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The JAK-STAT Signaling Pathway01:20

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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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mTOR Signaling and Cancer Progression03:03

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The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
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The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
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Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Un bucle de transmisión entre STAT1 y YAP1 estimula la biosíntesis de lípidos, acelera el crecimiento tumoral y

Shuo Wang1, Shiqi Diao2,3, Hyungdong Kim2,3

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Communications biology
|August 25, 2025
PubMed
Resumen

STAT1 promueve el crecimiento del tumor colorrectal y la supervivencia en los cánceres con mutación KRAS al aumentar la producción de lípidos. Dirigirse a la vía STAT1-YAP1 ofrece una nueva estrategia contra el cáncer de colon mutante KRAS resistente a la terapia.

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Área de la Ciencia:

  • En el campo de la oncología
  • Biología molecular
  • Investigación del cáncer

Sus antecedentes:

  • El transductor de señales y el activador de la transcripción 1 (STAT1) tradicionalmente tiene funciones antitumorales.
  • En condiciones tumorales, STAT1 puede exhibir funciones pro- supervivencia a través de mecanismos poco claros.
  • El KRAS mutante es un factor clave en muchos cánceres colorrectales, a menudo asociados con un mal pronóstico.

Objetivo del estudio:

  • Investigar el papel específico de STAT1 en las células tumorales colorrectales con KRAS de tipo salvaje o mutante.
  • Para dilucidar los mecanismos moleculares por los cuales STAT1 promueve la supervivencia y la proliferación del tumor en el contexto de KRAS mutante.
  • Para identificar posibles objetivos terapéuticos para el cáncer colorrectal mutante KRAS.

Principales métodos:

  • Se utilizaron líneas celulares de tumores colorrectales isogénicas con KRAS de tipo salvaje o mutante.
  • Se realizó un perfil de expresión génica para identificar los genes regulados por STAT1.
  • Investigó el papel de la fosforilación de STAT1 en S727 y su impacto en las vías de biosíntesis de lípidos.
  • Se analizó el eje STAT1-YAP1-TEAD4 y su contribución a la resistencia a la terapia.

Principales resultados:

  • STAT1 promueve específicamente la supervivencia y la proliferación en las células tumorales colorrectales mutantes KRAS.
  • STAT1 regula los genes de biosíntesis de esteroles y lípidos, incluidos SREBP1 y SREBP2, de una manera dependiente de la fosforilación de STAT1 S727.
  • Un bucle de retroalimentación positiva que involucra a STAT1, YAP1 y TEAD4 amplifica la producción de lípidos y el crecimiento tumoral en las células KRAS mutantes.
  • El eje STAT1-YAP1 confiere resistencia a los inhibidores de la vía del mevalonato y a la terapia dirigida al EGFR en el cáncer de colon mutante KRAS.

Conclusiones:

  • STAT1 juega un papel crítico en la supervivencia en el cáncer colorrectal mutante KRAS al promover la biosíntesis de lípidos.
  • La vía STAT1-YAP1 es un mediador clave de la resistencia a la terapia en este contexto.
  • Dirigirse a la interacción STAT1-YAP1 presenta una estrategia terapéutica prometedora para el cáncer colorrectal mutante KRAS.