Download - 4. Ciclos endocrinos F
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Sistema Endocrino
DrMV. Hernando Toledo CáceresUniversidad Nacional de Colombia
MorfofisiologíaUniversidad Cooperativa de Colombia
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Ciclo
hormonade crecimiento
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GHIH – GHRHSomatostatina - Somatocrinina
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Retroalimentadores
positivosGH
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Sueño REM
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Ejercicio
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Glucocorticoides
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Estradiol y progesterona
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Stress
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Hipoglicemia
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Melatonina
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Retroalimentadores
negativos
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Edad
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GH
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Morfina
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GH
Órgano Blanco: Todas las células del cuerpo
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Estimula los Factores de Crecimiento
• Ovárico• Nervioso• Mamario• Eritropoyético• Tromboblástico• Glial• Plaquetario• Epidérmico• Hepático
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Funciones GH
• Estimula mitosis• Aumenta
metabolismo de grasas
• Hipertrofia de células cardíacas
• Convierte Tiroxina en T3
• Estimula RNA o sea síntesis de proteínas
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Funciones GH
• Estimula células pancreáticas
• Aumenta síntesis de glucosa
• Aumenta masas musculares
• Aumenta la longitud y grosor óseo
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Ciclo
lactógeno
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PIF PRF
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Retroalimentadores
positivos
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Lactancia
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Succión
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Hormonas
Progesterona
Insulina
Tiroxina
Cortisol
TRH
VIP
Oxitocina
Sustancia P
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Tranquilizantes
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Retroalimentadores
negativos
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Stress
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GABA
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Estrógenos
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Funciones
• Mantener la lactancia• Crecimiento fetal• Equilibrio Electrolítico• Próstata, vesículas
seminales y testículos• Estimula formación
de receptores de membrana del ovario para FSH y LH
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Ciclo
adhvasopresina
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Diúresis
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Orina concentrada
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Retroalimentadores
positivos
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Hemorragias
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Anestésicos
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Presión osmótica alta
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LEC Bajo
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Retroalimentadores
negativos
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LEC alto
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Alcohol
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Diabetes insipida
Poliuria
Polidipsia
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Ciclo
Oxitocina
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Producción
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Células Mioepiteliales
Eyección
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Musculatura lisa
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Retroalimentadores
positivos
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Reflejo táctil
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Succión
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Amor maternal - paternal
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Descenso fetal
Reflejo de Ferguson
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Retroalimentadores
negativos
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Alcohol
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Ciclo
tiroideo
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YODO
Tirosina
Tiroglobulina
T3
T4T3
T3T4
T4
T4
T3
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Retroalimentadores
positivos
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Noche
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Frío Crónico
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Retroalimentadores
negativos
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Stress – Calor
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Funciones Yodotironinas
• Efecto calorigeno VD• Metabolismo
– Proteínas– Carbohidratos– Lípidos
• Maduración del SNC• Fuerza cardiaca• Motilidad intestinal• Crecimiento• Muscular y óseo
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•Reservorio de •Calcio
•98%
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Osteoclastos
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Osteoblasto
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Ciclo
cortisol
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Primera
Hormona
descubierta
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LPH
EndorfinasCiclo
Circadiano
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Retroalimentadores
positivos
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• Oxitocina• ADH• Traumatismo• Infección• Calor o frío
intenso• Cirugía• Restricción del
movimiento• Stress• Ritmo
circadiano
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Funciones ACTH
• Estimula Cortisol• Secreción de
esteroides• Síntesis de proteínas• Lipólisis• Libera insulina• Estimula GH• Acelera transporte de
glucosa en músculo
6 a 9 A.M
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Funciones Cortisol
• Inotropismo• Regulación de
interleucinas• Suprime
Prostaglandinas• Estimula el
catabolismo
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Ciclo
Pancreático
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Ciclo
sexual
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Generalidades de GnRH
• Pulsaciones• Luz :
Fotoperíodo• Estaciones
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CICLOS OVÁRICOS
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CICLOS OVÁRICOS
• Estro • Receptividad sexual,
al final del cual se produce la ovulación
• LH
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CICLOS OVÁRICOS
• Metaestro• Periodo de desarrollo
inicial del cuerpo lúteo que comienza al final del estro
• Progesterona
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CICLOS OVÁRICOS
• Diestro• Período de actividad
del cuerpo lúteo maduro que comienza días después de la ovulación y finaliza con la lúteolisis
• Progesterona y estrógenos
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CICLOS OVÁRICOS
• Proestro• Periodo de
crecimiento folicular que se inicia con la regresión del cuerpo lúteo y culmina con la aparición del estro.
• FSH
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CICLOS OVÁRICOS
• Anestro• Falta de celo o estro
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Retroalimentadores + de GnRH
• Feromonas• Bulbo olfatorio• Retina• Sonidos• Noradrenalina• Alimentación• Temperatura• Estradiol• Melatonina
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Retroalimentadores - de GnRH
• Dopamina• Opioides• Stress• Corticoides• Inhibina
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Hembras
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Ovogénesis
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Crecimiento folicular
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PGF2&
Interferón Thau
GnRH
FSH
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Ovulación inducida
Conejas
Ardillas
Ratas
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Ciclo
melatonina
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Ritmos circadianos
• Reloj Biológico• Núcleo
supraquiasmático• Melatonina• 24 horas• Animales y plantas• Luz• Ciclos hormonales
– Ciclos ovulatorios– Cerebro A.M.– Huesos P.M
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Melatonina
• Glándula pineal• Por fuera de la BH• Antioxidante
– Cerebro, placenta, endometrio, riñón, hígado, intestino, retina, tiroides, timo, adrenal, páncreas, ovarios, células inmunes.
• Después de la pubertad se calcifica
• Insomnio, depresión, vejez• Avena, cereza, maíz,
tomate, papa y arroz
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Retroalimentadores
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Ambientales
Fotoperíodo
Estaciones
Temperatura
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EndógenosStress Edad
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Metabolismo
• Marcapasos endógeno• Mayor producción en la
oscuridad y menor en horas de mayor luz
• Órganos blanco • Neurales: hipocampo,
hipófisis, hipotálamo, retina, glándula pineal y otros)
• No Neurales: gónadas, intestino, vasos sanguíneos, células inmunes
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Funciones
• Ritmos circadianos• Inhibe las gónadas• Causa los ciclos de fertilidad
e infertilidad• Aprendizaje y memoria• Antidepresiva• Controla migrañas• Sistema inmune• Envejecimiento• Reduce el daño de tejidos
por isquemia