Related Experiment Videos
Newborn response to cationic amphiphilic drugs
Insights
Cationic amphiphilic drugs cause phospholipid storage and toxicity in newborn rats, but not in chick embryos. Phenobarbital can mitigate these drug effects, suggesting species and administration route influence outcomes.
Area of Science:
- Pharmacology
- Toxicology
- Cell Biology
Background:
- Cationic amphiphilic drugs induce phospholipid storage disorders (phospholipidosis) in various tissues, particularly the lungs.
- In utero drug exposure leads to offspring toxicity and mortality in newborn rats, with pulmonary pathology implicated.
- Chick embryos do not exhibit phospholipid storage upon drug administration, unlike mammals.
Purpose of the Study:
- To investigate the effects of cationic amphiphilic drugs on phospholipid storage and toxicity across different species and administration routes.
- To explore the protective mechanisms of phenobarbital against drug-induced phospholipidosis and toxicity in newborn rats.
Main Methods:
- Administration of cationic amphiphilic drugs to pregnant rats and newborn rats.
- Comparative study involving chick embryo exposure to the same drugs.
- Concurrent administration of phenobarbital with chlorphentermine in newborn rats.
- Assessment of phospholipid storage and mortality in offspring and chick embryos.
Main Results:
- In utero drug exposure caused phospholipidosis and mortality in newborn rats, while direct administration induced phospholipidosis but not mortality.
- Chick embryos showed no significant phospholipid storage after drug administration.
- Phenobarbital co-administration reduced or prevented phospholipid storage in rat lung and kidney.
Conclusions:
- Animal susceptibility to cationic amphiphilic drugs varies by species, age, tissue, and administration method.
- Phenobarbital may alter drug excretion, metabolism, or phospholipase activity, mitigating drug-induced phospholipidosis.
- Understanding these factors is crucial for predicting and managing drug-induced toxicity and phospholipid storage disorders.
Abstract:
Administration of various cationic amphiphilic drugs in utero results in induction of a phospholipid storage disorder in many tissues, particularly in lungs. In addition to the phospholipidosis in utero, drug exposure results in toxicity to the offspring; newborn rats die within 48 h of birth. Although drug-induced pulmonary pathological changes appear to be involved in the observed mortality, this relationship remains unclear. In contrast to mammals, administration of cationic amphiphilic drugs to the chick embryo seems not to induce phospholipid storage in the tissues examined. Treatment of newborn rats directly with these drugs also induces phospholipidosis in several tissues including lung and kidney; however, mortality does not occur. Concurrent administration of phenobarbital and chlorphentermine reduces or prevents amphiphilic drug-induced phospholipid storage in newborn rat lung and kidney. Modification of chlorphentermine actions by phenobarbital may be caused by alterations in amphiphilic drug excretion, metabolism, and catabolic phospholipase activity. Evidence thus indicates that regardless of age, animals appear susceptible to the effects of cationic amphiphilic drugs; however, species and tissues examined, as well as specific drug administration, play an important role in the observed qualitative and quantitative responses.