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MAPK Signaling Cascades01:07

MAPK Signaling Cascades

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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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Interactions Between Signaling Pathways01:19

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.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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PI3K/mTOR/AKT Signaling Pathway01:22

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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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Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

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Subcellular Fractionation for ERK Activation Upon Mitochondrial-derived Peptide Treatment
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Las cascadas de señalización de la MAP quinasa de los mamíferos son cascadas de señalización de la MAP quinasa.

L Chang1, M Karin

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PubMed
Resumen

Las proteínacinasas activadas por mitógenos (MAPK) son enzimas de señalización eucarióticas cruciales. Investigaciones recientes revelan sus funciones vitales en la regulación de la expresión génica, el crecimiento celular y la muerte celular programada.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • Biología Molecular Biología Molecular
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • Las proteínacinasas activadas por mitógenos (MAPK) son enzimas transductoras de señales esenciales en los eucariotas.
  • Las cascadas de señalización MAPK regulan diversos procesos celulares.

Objetivo del estudio:

  • Para dilucidar las funciones fisiológicas de las cascadas de señalización de MAPK.
  • Comprender el papel de las MAPK en el control de la expresión génica, la proliferación celular y la muerte celular programada.

Principales métodos:

  • Revisión de la literatura de estudios recientes sobre la señalización de las MAPK.
  • Análisis de datos experimentales sobre componentes y funciones de la vía MAPK.

Principales resultados:

  • Las cascadas de MAPK son parte integral de la regulación celular.
  • Las MAPK influyen significativamente en los patrones de expresión génica.
  • Las MAPK juegan un papel clave en la proliferación celular y la apoptosis.

Conclusiones:

  • Las vías de señalización MAPK son críticas para la función de las células eucariotas.
  • Investigaciones adicionales sobre las funciones de MAPK pueden revelar objetivos terapéuticos para enfermedades que implican crecimiento celular y muerte.