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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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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.
The mTOR pathway or the...
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MAPK Signaling Cascades01:07

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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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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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cAMP-dependent Protein Kinase Pathways01:25

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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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Video Experimental Relacionado

Updated: Apr 14, 2026

Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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PK-M2 hace que las células sean más dulces en HIF1

Daniel A Tennant1

  • 1School of Cancer Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.

Cell
|May 31, 2011
PubMed
Resumen

El factor inducible a la hipoxia 1 (HIF1) interactúa con la piruvato quinasa (PK) -M2. Este descubrimiento revela un nuevo mecanismo detrás del efecto Warburg, un cambio metabólico común en las células cancerosas.

Área de la Ciencia:

  • Biología molecular La biología molecular.
  • El metabolismo del metabolismo del cáncer.
  • La señalización celular de las células.

Sus antecedentes:

  • El factor inducible a la hipoxia 1 (HIF1) es un factor de transcripción clave que regula la respuesta celular al bajo nivel de oxígeno.
  • HIF1 promueve la glucólisis anaeróbica mediante la inducción de enzimas específicas.
  • El efecto Warburg, caracterizado por una glicólisis aeróbica elevada, es un sello distintivo de muchos tipos de cáncer.

Objetivo del estudio:

  • Para identificar nuevos socios de interacción de HIF1.
  • Para dilucidar los mecanismos moleculares subyacentes al efecto Warburg en el cáncer.

Principales métodos:

  • Los ensayos de coinmunoprecipitación detectan las interacciones proteína-proteína.
  • Western blotting para confirmar la expresión e interacción de las proteínas.

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Principales resultados:

  • La piruvato quinasa (PK) -M2 fue identificada como un nuevo socio de interacción de HIF1.1.
  • Esta interacción sugiere un vínculo directo entre HIF1 y la regulación de la enzima glicolítica.

Conclusiones:

  • La interacción entre HIF1 y PK-M2 proporciona una posible explicación molecular para el efecto Warburg.
  • Dirigirse a esta interacción podría ofrecer nuevas estrategias terapéuticas para el tratamiento del cáncer.