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dynamiek algemene farmacologie

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dynamiek algemene farmacologie

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Pharmacodynamics




Pieter De Cock, Dpt Basic and Applied Medical Sciences




1

,Gm met bepaalde doelstelling → moet op de plaats waar het effect moet uitoefenen geraken in juiste conc om gewenst effect te krijgen
Niet elk gm heeft aangrijpingspunt in plasma/bloed
Vaak verschijnt gm ook in andere weefsels → kan ongewenste effecten veroorzaken




2

, Target sites of pharmaceuticals

Typically, a medicinal product should be absorbed into the organism and interact with endogenous cell
components to provoke an effect.
Usually via proteins (DNA in case of antitumoral drugs):
➢ Ion channels
➢ Enzymes
➢ Carriers
➢ Receptors




3




Aangrijpingspunten van gm: typisch proteïnen: ion kanalen, enzymen, carriers & receptoren (belangrijkste vorm!)
Igv anti-tumorale gm kan ook DNA zijn




3

, 1. Ion channels

Voltage-dependent




Lidocain: local anaesthetic – neuronal cell membrane
Human Medi cal P hysiology Calcium channel blockers – muscle cells heart and blood vessels 4




Spanningsgevoelige kanalen

Lidocaïne: lokaal anestheticum die als aangrijpingspunt Na-K kanaal heeft
Wnr er stimulus is: normaal AP met Na influx & repolarisatie met K efflux
Kunnen we blokkeren < ionkanaal blokkeren
Lokaal anestheticum
Blokkeren → signaal w niet meer getransporteerd: lokaal verdovend effect

Ca kanaal blokkers (bijv verapamil): bloedbaan & hartweefsel
→ Nodig voor contractie van hart
→ Minder contractiliteit





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