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Videos de Conceptos Relacionados

Feedback Loops01:01

Feedback Loops

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In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
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Regulation of Hormone Secretion01:19

Regulation of Hormone Secretion

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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral...
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Hormones of the Pituitary Gland01:27

Hormones of the Pituitary Gland

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The small, pea-sized pituitary gland is located at the base of the brain. It is crucial in regulating various bodily functions, from growth to reproduction. The gland is divided into the anterior lobe and the posterior lobe. The secretory cell clusters in the pars distalis of the anterior pituitary lobe are controlled by hypothalamic regulators and synthesize six primary hormones.
The most abundantly secreted hormone from the anterior lobe is the growth hormone, which controls overall growth by...
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Major Hormones and Their Functions01:27

Major Hormones and Their Functions

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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and...
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Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
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Target Cell Response to Hormones01:22

Target Cell Response to Hormones

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Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
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Reproductive experience promotes permanent body growth independently of growth hormone.

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GH-Releasing Hormone Neurons Regulate the Hypothalamic-Pituitary-Somatotropic Axis via Short-Loop Negative Feedback.

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Hypothalamic Kisspeptin Neurons as a Target for Whole-Cell Patch-Clamp Recordings
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Hypothalamic Kisspeptin Neurons as a Target for Whole-Cell Patch-Clamp Recordings

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Los ciclos de retroalimentación negativa y los factores hormonales que regulan la secreción de la hormona del

Ligia M M de Sousa1, Vanielle A N Vicente1, Jose Donato1

  • 1Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP, 05508-000, Brazil.

Endocrinology
|September 5, 2025
PubMed
Resumen

La secreción de la hormona del crecimiento (GH) está estrechamente controlada por complejos circuitos de retroalimentación que involucran al hipotálamo y la glándula pituitaria. Investigaciones recientes ponen de relieve nuevos factores hormonales y neuronales que influyen en esta liberación pulsátil, crucial para el crecimiento y el metabolismo.

Palabras clave:
GH (hormona de crecimiento)GHRH y sus derivadosEl IGF-1el hipotálamoNeuroendocrinologíaLa somatostatina también tiene un efecto secundario.

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Área de la Ciencia:

  • Neuroendocrinología
  • Fisiología
  • Biología molecular

Sus antecedentes:

  • La hormona del crecimiento (GH) es esencial para el crecimiento corporal y numerosas funciones fisiológicas.
  • La GH es secretada por la pituitaria anterior de una manera pulsátil, regulada por factores hipotalámicos.
  • Los ciclos de retroalimentación negativa que involucran la secreción modulada de GH y el factor de crecimiento similar a la insulina 1 (IGF-1).

Objetivo del estudio:

  • Revisar los hallazgos recientes sobre los mecanismos que regulan la secreción pulsativa de GH.
  • Para discutir las implicaciones de nuevos conocimientos sobre el control neuroendocrino de la GH.
  • Resumir las funciones de los factores hormonales y neuronales en la regulación de la GH.

Principales métodos:

  • Revisión de la literatura de estudios recientes sobre la secreción de GH.
  • Análisis de los mecanismos reguladores a nivel pituitario e hipotálamo.
  • Examen de la afectación del circuito hormonal y neuronal.

Principales resultados:

  • La secreción de GH está influenciada por ciclos de retroalimentación negativa y factores hormonales específicos.
  • Los circuitos neuronales juegan un papel importante en la regulación de la liberación de GH pulsátil.
  • La secreción de GH se eleva durante estados fisiológicos específicos como el embarazo y la hipoglucemia.

Conclusiones:

  • El control neuroendocrino de la secreción de GH es complejo e implica múltiples capas reguladoras.
  • Los nuevos hallazgos mejoran nuestra comprensión del papel de la GH en el crecimiento y el metabolismo.
  • La investigación adicional de estos mecanismos podría tener implicaciones clínicas para los trastornos del crecimiento.