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Fixed-dose regimens are a common approach to administer drugs to achieve and maintain desired levels of the drug in the body. In this dosing strategy, a specific amount of medication is given at regular intervals, often multiple times a day, to ensure a consistent drug concentration in the bloodstream.
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A rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By understanding these factors, the appropriate dosage can be determined, and the dosing schedule can be designed to achieve and maintain the desired therapeutic effect while minimizing adverse effects.
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Chemical buffers play a critical role in the body's regulation of pH levels. These systems contain one or more compounds that stabilize pH changes by neutralizing strong acids or bases. When pH levels drop, hydrogen ions bind to a weak base; when pH levels rise, hydrogen ions are released. This dynamic process helps maintain pH within a narrow and stable range essential for normal physiological function.
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Programmable self-regulated molecular buffers for precise sustained drug delivery.

Arnaud Desrosiers1,2, Rabeb Mouna Derbali3, Sami Hassine2

  • 1Laboratoire de Biosenseurs et Nanomachines, Département de Chimie, Université de Montréal, Montréal, QC, H3C 3J7, Canada.

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|November 3, 2022
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Summary
This summary is machine-generated.

Scientists created programmable nucleic acid buffers that precisely control drug concentrations. These aptamer-based systems optimize drug delivery, enhancing therapeutic effects and reducing side effects for improved patient outcomes.

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Area of Science:

  • Biomolecular Engineering
  • Drug Delivery Systems
  • Chemical Biology

Background:

  • Biological systems exhibit superior environmental responsiveness compared to artificial nanosystems.
  • Natural molecular buffers utilize Le Chatelier's principle for precise molecular delivery.
  • Current drug delivery methods face challenges in maintaining optimal therapeutic concentrations and minimizing toxicity.

Purpose of the Study:

  • To design and develop self-regulated nucleic acid molecular buffers inspired by natural systems.
  • To program these buffers for precise control of specific drug concentrations.
  • To investigate the optimization of drug properties and therapeutic outcomes using these novel buffers.

Main Methods:

  • Application of Le Chatelier's principle to design nucleic acid aptamer-based buffers.
  • In vitro and in vivo testing of buffer performance for chemotherapeutic (doxorubicin) and antimalarial (quinine) agents.
  • Evaluation of buffer impact on drug chemical stability, partition coefficient, pharmacokinetics, and biodistribution.

Main Results:

  • Demonstrated successful programming of aptamer-based buffers to maintain desired free drug concentrations.
  • Showcased the ability to optimize drug chemical stability, partition coefficient, pharmacokinetics, and biodistribution.
  • Confirmed buffer efficacy in both in vitro and in vivo experimental settings.

Conclusions:

  • Programmable nucleic acid molecular buffers can be engineered using Le Chatelier's principle.
  • These buffers offer precise control over drug concentrations, enhancing therapeutic efficacy.
  • The developed system holds potential for improving patient outcomes by optimizing drug activity and reducing adverse effects.