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Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
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Factors Affecting Drug Distribution: Physiological Barriers01:23

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Drug distribution in the body is intricately regulated by various physiological barriers that control the passage of substances. These include the capillary endothelial barrier, the blood-brain, blood-cerebrospinal fluid, blood-placental, and blood-testis barriers.
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Factors Affecting Drug Distribution: Miscellaneous Factors01:19

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Factors Affecting Drug Distribution: Tissue Permeability01:30

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The parenteral route is a critical method of drug administration. It delivers compounds directly into the systemic circulation and bypasses the gastrointestinal tract. This approach is particularly advantageous for drugs that exhibit poor absorption or instability when administered orally.
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Determinants of drug entry into the developing brain.

Liam Koehn1, Mark Habgood1, Yifan Huang1

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The developing brain is more vulnerable to drug exposure than the adult brain due to lower efflux transporter capacity. Chronic drug exposure increases risk in neonates, unlike in adults where it offers some protection.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Developmental Biology

Background:

  • Drug safety in pregnancy and neonates is a clinical concern, especially regarding long-term neurodevelopment.
  • Limited knowledge exists on placental and blood-brain barrier drug permeability during development.
  • The role of ATP-binding cassette (ABC) transporters in limiting brain drug entry during development is poorly understood.

Purpose of the Study:

  • To investigate developmental differences in drug transfer across the blood-brain barrier and placenta.
  • To assess the impact of acute versus chronic drug exposure on drug entry into the brain at different developmental stages.
  • To explore the role of ABC transporters in mediating age-dependent drug permeability.

Main Methods:

  • Radiolabeled paracetamol, digoxin, and cimetidine were administered to Sprague Dawley rats at fetal (E19), neonatal (P4), and adult stages.
  • Drug entry into brain and cerebrospinal fluid (CSF) was measured after acute or chronic (5-day) intraperitoneal exposure.
  • Placental transfer and brain/CSF drug levels were compared to passive diffusion markers (L-glucose, sucrose, glycerol).
  • ABC transporter gene expression in brain, choroid plexus, and placenta was analyzed using RT-qPCR.

Main Results:

  • Developing brains and CSF showed higher drug entry compared to adult brains and CSF.
  • In adults, chronic treatment decreased digoxin and paracetamol brain entry, correlating with ABCB1a (P-glycoprotein) upregulation.
  • No such downregulation or decreased transfer was observed in fetal or neonatal animals.
  • Chronic paracetamol exposure paradoxically increased drug transfer into the fetal brain.

Conclusions:

  • The developing brain exhibits reduced efflux capacity, increasing vulnerability to acute drug exposure.
  • Adult brains develop regulatory capacity for efflux transporters, offering protection against chronic drug exposure.
  • Neonatal brains lack this regulatory capacity, posing a greater risk from chronic drug administration.
  • These findings highlight critical developmental differences in drug transport and safety.