Can you accurately predict how much drug absorbs into the bloodstream?
Drug absorption can be affected by both drug-specific and patient-specific factors. Absorption data determines how much of the drug reaches the systemic circulation after oral or inhaled administration so that a suitable therapeutic range can be established.
Due to their physiological complexity, recreating human-representative biological barriers in vitro is difficult. Animals offer limited advantages as their biological make-up differs from humans. Combined, this means accurately predicting drug absorption and permeability in preclinical drug development can be challenging.
Inhaled medicines offer an advantage over oral administration, due to the low metabolic capacity of the lung. Unfortunately, there are relatively few in vitro inhaled drug absorption assays available. In vitro gut absorption models suffer from low metabolic capacity, which limits their ability to accurately mimic the human intestinal response to orally administered drugs. Both suffer from permeability values that are not physiologically relevant.
PhysioMimix™ Drug Absorption Assays utilize Lung-on-a-chip (alveolar or bronchial), or Gut-on-a-chip co-culture models. Fundamental to the success of these models is organ-specific perfusion, which drives the development of complex 3D tissue morphologies, the expression of key cellular components (e.g., mucus or metabolic enzymes), and barrier integrities that align closely with the human.
These models can be used to calculate absorption into cells and/or drug permeability rates across the epithelial barrier. The oral drug absorption assay can also predict systemic exposure following oral dosing via the first-pass metabolism. Data derived using these assays more accurately translates into human outcomes compared to traditional approaches.
Studying drug absorption
Limitations with current techniques
- Difficult to predict transport rates for slowly absorbed compounds
- Lack of mucous secretion
- Limited transporter expression/activity
- Low metabolic activity
- In vivo model data fail to translate into clinical studies
Advancements with PhysioMimix OOC
- Perfusion of microtissues increases in-vivo-like barrier integrity and permeability of the epithelium
- Goblet cells secrete mucus, more closely mimicking the mucosal barrier
- Major transporters are expressed by the epithelium
- Organ-relevant metabolic capacity
- Specific tissue functions and assay types are enabled by the 3D complexity of the model
Organ-specific perfusion delivers physiologically relevant barrier integrities
Perfused Gut-on-a-chip models provide an order of magnitude smaller TEER values than standard 2D static Caco-2 cell cultures to better predict the permeabilities of drugs with varying rates of absorption.
Overcoming the issue of predicting inhaled drug ADME in vitro
Measure the permeability and cellular accumulation of inhaled medications using human Lung-on-a-chip models, with compounds dosed onto the epithelial airway interface.
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Bespoke projects are carried out by our dedicated team of scientists in our CRO facility providing you with actionable data within weeks.
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