icom lez 9 ormoni
TRANSCRIPT
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ORMONI E SECONDI
MESSAGGERI
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�GLI ORMONI SONO
MESSAGGERI CHIMICI
CHE NEGLI ORGANISMI
MULTICELLULARI
COORDINANO L’ATTIVITA’ DI
CELLULE E TESSUTI DIVERSI
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CLASSIFICAZIONE
� 1. ORMONI PROTEICI E PEPTIDICI
� 2. ORMONI STEROIDEI
� 3. ORMONI DERIVATI DA AMINOACIDI
� 4. ORMONI DERIVATI DA ACIDI
GRASSI (AZIONE LOCALE)
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MECCANISMI D’AZIONE DEGLI ORMONI
1. INCENTIVANO LA SINTESI PROTEICAa. STIMOLAZIONE DELLA TRASCRIZIONEb. STIMOLAZIONE DELLA TRADUZIONE
2. MODULANO LE ATTIVITA’ ENZIMATICHE
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Ormoni steroidei e
tiroidei
Il recettore e’ in
cellula e il loro
meccanismo
d’azione avviene
direttamente sul
DNA attivando o
inibendo la
trascrizione
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ORMONE NON STEROIDEO
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Secondi
messaggeri :
cAMP
ORMONE
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Secondo
messaggero:
IP3 e Calcio
ORMONE
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Calmodulina e Calcio
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RECETTORI TIROSIN KINASI
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REGOLAZIONE GLICEMIA INSULINA /GLUCAGONE
� GLUCAGONE polipeptide, Pancreas Endocrino
�Organi Fegato Tes. Adiposo
�bersaglio 2nd messag. cAMP
1. ALZA GLICEMIA
2. STIMOLA LA DEMOLIZIONE DEL GLICOGENO
(ATTIVANDO E INIBENDO ENZIMI)
3. STIMOLA LA LIPOLISI
ORMONE CATABOLICO
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REGOLAZIONE GLICEMIA INSULINA /GLUCAGONE
�INSULINA polipeptide, Pancreas Endocrino
�Organi Fegato Tes. Adiposo e Muscolare
�bersaglio1. ABBASSA LA GLICEMIA
2. STIMOLA LA SINTESI DEL GLICOGENO
(ATTIVANDO E INIBENDO ENZIMI)
3. STIMOLA LA SINTESI DI ACIDI GRASSI E
LA SINTESI PROTEICA
ORMONE ANABOLICO
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REGOLAZIONE CALCEMIAPARATORMONE/ CALCITONINA
� PARATORMONE proteina, Paratiroidi
�Organi Ossa, Reni, Intestino
�bersaglio 2nd messag. cAMP1. STIMOLA IL RIASSORBIMENTO DI CALCIO (reni)
2. STIMOLA LA MOBILITAZIONE DI CALCIO (ossa)
3. STIMOLA (ind.) RIASSORBIMENTO DI CALCIO INTESTINALE
IPERCALCEMIZZANTE
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REGOLAZIONE CALCEMIAPARATORMONE/ CALCITONINA
�CALCITONINA polipeptide, Tiroide
Organi Ossa , Reni
�bersaglio 2nd messag. cAMP
1. AUMENTA L’ELIMINAZIONE DI CALCIO E FOSFATO (reni)
2. DIMINUISCE IL RILASCIO DI CALCIO E FOSFATO (ossa)
IPOCALCEMIZZANTE
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ORMONI IPOFISARI� ORMONE DELLA CRESCITA GH (STH)
� ORMONE TIREOTROPICO TSH
� ORMONE ADRENOCORTICOTROPICO ACTH
� PROLATTINA LTH
� ORMONE LUTEIZZANTE LH ICSH
� ORMONE FOLLICOLO STIMOLANTE FSH
� ORMONE MELANOCITO STIMOLANTE MSH
� VASOPRESSINA
� OSSITOCINA
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S
S
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ORMONE della CRESCITA GH
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ORMONI IPOFISARI
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ORMONI TIROIDEI
� TRIIODOTIRONINA T3
� TIROXINA T4
DERIVATI DI AA (TIROSINA)
AZIONE ANABOLICA
1. Aumento della sintesi proteica in tutti i tessuti
2. Aumento dell'attività della RNA-polimerasi
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AZIONE CATABOLICA
1. AUMENTO del CONSUMO di
OSSIGENO e della PRODUZIONE di
CALORE
2. AUMENTO del METABOLISMO BASALE
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ORMONI DELLA MIDOLLARE DEL SURRENE
NORADRENALINA e ADRENALINADERIVATI DI AA TIROSINA
AZIONE
1. STIMOLANO LA GLICOGENOLISI EPATICA E MUSCOLARE
2. STIMOLANO LA LIPOLISI
3. AUMENTANO LA GITTATA CARDIACA
4. AUMENTANO LA PRESSIONE ARTERIOSA
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ORMONI DELLA CORTICALE DEL SURRENE
ORMONI STEROIDEI
Organo bersaglio RENE
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ORMONI DELLA CORTICALE DEL SURRENE
ORMONI STEROIDEI
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PROSTANOIDI
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Ormoni che regolano il senso di fame e sazietà
� Leptina
� Insulina
� Adiponectina
� PYY 3-36
� Ghrelina
INIBISCONO IL
SENSO DI FAME
ATTIVA IL
SENSO DI FAME
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