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Profilo proteico nella rigenerazione epatica dopo epatectomia parziale

Profilo proteico nella rigenerazione epatica dopo epatectomia parziale

Hanan Farouk Aly

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Editorial:
KS OmniScriptum Publishing
Año de edición:
2025
Materia
Biologia, ciencias de la vida
ISBN:
9786209351884
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La maggior parte delle proteine sieriche è sintetizzata dal fegato, la cui concentrazione è diminuita in risposta all’epatectomia parziale e ciò può essere dovuto alla riduzione della massa epatica; la produzione di proteine epatiche è diretta principalmente al processo di rigenerazione piuttosto che alla produzione delle proteine sieriche esportate. Le proteine sieriche hanno un’esistenza dinamica con degradazione e sintesi che sostituiscono continuamente le proteine circolanti in qualsiasi momento; il tasso di sintesi è uguale al tasso di degradazione, quindi la concentrazione di proteine nel siero rimane costante, cosicché la tendenza della concentrazione delle proteine sieriche a rimanere costante implica l’esistenza di un meccanismo che determina il tasso di produzione, il tasso di degradazione o entrambi. Nel caso delle proteine il cui livello sierico diminuisce (ceruloplasmina, α-l-antitripsina, prealbumina, lipoproteina B, α-1-macroglobulina, α-1-glicoproteina acida, colinesterasi ed emopessina), in particolare quelle con piccole dimensioni molecolari come l’albumina e la transferrina, sono accompagnate da un aumento della degradazione dell’albumina o da un aumento del catabolismo che deve superare l’aumento della sintesi. Le variazioni dei tassi di degradazione delle singole proteine non sono parallele alle variazioni nei ratti.

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