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Toxicity of morphazinamide compared with pyrazinamide
Abstract:
In a toxicological study on rats two derivatives of pyrazine: morphazinamide (MZA) and pyrazinamide (PZA) were compared with the objective to verify the possibility of using MZA as a substitute for the hepatotoxic PZA. The daily recorded weight and food intake of the rats were statistically significantly changed in the experimental groups with MZA as well as those with PZA, as compared with the control group and the group fed parallelly, already after the sixth dose of MZA and PZA 2.5 g per kg body weight, and similarly changed were also the various biochemical blood and liver tissue tests. Yet, certain differences were observed between the action of MZA and PZA. Some explanation was obtained from PZA blood and tissue concentrations, determined in the course of 24 hours following the administration of the sixth dose of both drugs. A repeated administration of MZA led to a PZA cumulation in the blood and organs of the rats. The study demonstrated that both drugs are hepatotoxic and, in high doses, also nephrotoxic. Moreover, MZA decreases the concentration of plasmatic iron and causes spleen atrophy. It will not be, therefore, a suitable substitute for the hepatotoxic PZA.
Insights
Morphazinamide (MZA) and pyrazinamide (PZA) are both hepatotoxic and nephrotoxic drugs. MZA is not a suitable substitute for PZA due to its own toxicity and PZA accumulation.
Area of Science:
- Toxicology
- Pharmacology
- Drug Development
Background:
- Pyrazinamide (PZA) is a first-line antituberculosis drug known for its hepatotoxicity.
- Morphazinamide (MZA) has been investigated as a potential substitute for PZA.
Purpose of the Study:
- To compare the toxicological profiles of MZA and PZA in rats.
- To evaluate the suitability of MZA as a safer alternative to PZA.
Main Methods:
- Rats were administered MZA or PZA at a dose of 2.5 g/kg body weight.
- Body weight, food intake, and biochemical parameters (blood and liver tissue) were monitored.
- PZA concentrations in blood and tissues were measured over 24 hours after repeated MZA administration.
Main Results:
- Both MZA and PZA significantly altered rat weight, food intake, and biochemical markers.
- MZA administration led to PZA accumulation in blood and organs.
- Both drugs exhibited hepatotoxicity and nephrotoxicity at high doses.
- MZA also caused decreased plasmatic iron and spleen atrophy.
Conclusions:
- MZA and PZA share similar toxic effects, including hepatotoxicity and nephrotoxicity.
- MZA is not a suitable substitute for PZA due to its own adverse effects and potential for PZA accumulation.