Related Experiment Video
Updated: Jun 8, 2026
09:09
Lethality Bioassay Using Artemia salina L.
Published on: October 11, 2022
Correlation of acute lethal potency with in vitro cytotoxicity
J R Fry1, M J Garle, A H Hammond
1Department of Physiology and Pharmacology, Medical School, Queen's Medical Centre, Nottingham NG7 2UH, UK.
Summary
In vitro cytotoxicity correlates with lethal potency for compounds affecting cell structures. However, absorption and metabolism data are crucial for accurate potency assessment, as toxicity mechanisms influence this relationship.
Area of Science:
- Toxicology
- Pharmacology
- Biochemistry
Background:
- In vitro cytotoxicity assays are vital for predicting chemical toxicity.
- Understanding the relationship between in vitro measures and in vivo toxicity is essential for risk assessment.
Purpose of the Study:
- To compare in vitro cytotoxicity (ID50) with in vivo acute lethal toxicity (LD50) for 27 compounds.
- To investigate the correlation between cytotoxicity and lethal potency for compounds interfering with cell functions.
Main Methods:
- Determined in vitro cytotoxicity (ID50) for 27 compounds.
- Retrieved oral and intraperitoneal LD50 values from the Registry of Toxic Effects of Chemical Substances.
- Analyzed correlations between log LD50 and log ID50 values, excluding compounds with significant metabolic influence.
Main Results:
- A weak positive correlation was found between oral LD50 and ID50 (r=0.49).
- A stronger correlation was observed between intraperitoneal LD50 and ID50 (r=0.68), improving to r=0.82 when metabolism-influenced compounds were excluded.
- Highly significant correlations were found for anti-metabolites (r=0.94) and alkylating agents (r=0.96).
Conclusions:
- In vitro cytotoxicity is correlated with intrinsic lethal potency for compounds targeting cell structures.
- Absorption, metabolism, and disposition data are necessary to accurately assess potency from cytotoxicity data.
- The mode of toxicity significantly influences the relationship between LD50 and ID50 values.
More Related Videos
Related Concept Videos
01:20Drug Product Performance: In Vitro–In Vivo Correlation
In pharmaceutical development, it's crucial to establish a predictive in vitro–in vivo correlation (IVIVC) for two or more formulations to gain a comprehensive understanding of release properties. IVIVC reduces the need for costly in vivo studies and facilitates the establishment of meaningful dissolution specifications with significant cost savings and decreased regulatory burden. Furthermore, a meaningful IVIVC should predict Cmax and AUC within 20%, aligning with FDA guidance while adhering...
01:23Toxicity Testing in Animals
Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...