Organotypic systems in drug metabolism and toxicity: challenges and opportunities

Ajit Dash1, Brett R Blackman, Brian R Wamhoff

  • 1HemoShear LLC, Liver Surrogate Systems, 1115 5th Street SW, Charlottesville, VA 22903, USA. dash@hemoshear.com

Abstract

Insights

Organotypic systems offer a solution to predict drug efficacy and safety more accurately than traditional methods. These advanced models use human cells and controlled environments to improve preclinical decision-making in drug discovery.

Area of Science:

  • Biotechnology
  • Drug Discovery
  • Translational Medicine

Background:

  • High-throughput screening and animal models often fail to predict in vivo drug responses, impacting human clinical trial decisions.
  • Limitations in current preclinical models hinder accurate prediction of drug safety and efficacy.
  • Organotypic systems are being developed to bridge the gap between in vitro screening and in vivo studies.

Purpose of the Study:

  • To review the evolution and approaches of organotypic systems for recreating physiological responses.
  • To discuss the challenges and opportunities in developing these advanced in vitro models.
  • To highlight the role of organotypic systems in de-risking drug discovery and development.

Main Methods:

  • Examination of various approaches to recreate physiological responses on a laboratory bench.
  • Tracing the historical development of organotypic systems.
  • Review of literature foundational to biotechnology companies and government initiatives in this field.

Main Results:

  • Organotypic systems represent a significant advancement in preclinical research.
  • Emerging technologies enable precise control of the culture environment for these systems.
  • Human primary cells are crucial for developing effective organotypic models.

Conclusions:

  • Benchmarking translational system decisions against human-relevant endpoints and clinical data is essential for early, meaningful preclinical decisions.
  • Human organotypic systems, utilizing primary cells and advanced technologies, are key to de-risking drug discovery.
  • These systems promise to improve the accuracy of predicting clinical outcomes from preclinical data.

Related Concept Videos

Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
Pharmacogenetics of Drug Metabolism: Overview01:27

Pharmacogenetics of Drug Metabolism: Overview

Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...
Toxicokinetics: Overview01:21

Toxicokinetics: Overview

Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
Drug Biotransformation: Overview01:16

Drug Biotransformation: Overview

Pharmaceutical substances known as xenobiotics are predominantly lipophilic and nonionized. This enables them to permeate lipid bilayers, such as cell membranes, and interact with intracellular target receptors. Lipophilic drugs have an advantage in crossing biological barriers and reaching their intended sites of action. However, lipophilic drugs often have a restricted capacity for renal expulsion or elimination from the body. When these drugs enter the kidneys and undergo glomerular...
Drug Biotransformation: Overview01:28

Drug Biotransformation: Overview

Biotransformation, also known as drug metabolism, is a vital physiological process that chemically alters drugs, facilitating their elimination from the body and terminating their action. This process involves two main phases: phase I and phase II reactions. Phase I reactions, including oxidation, reduction, and hydrolysis, introduce or unmask polar functional groups on the drug molecule, thereby increasing its water solubility. By enhancing water solubility, the drug becomes more hydrophilic...