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[Effect of a carcinogen on the electric activity of the rat stomach]
Abstract:
Acute experiments on rats showed that the intragastric administration of an aqueous solution of N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) elicited depression of the electrical activity of the gastric wall manifested by a decrease in the amplitude and frequency of the basic electrical rhythm and by its complete stopping in most cases. MNNG abolished the excitatory reaction caused both by the vagal electric stimulation and administration of carbacholine, but there persists an inhibitory reaction elicited both by the vagal stimulation and infusion of ATP.
Insights
N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) significantly disrupts gastric electrical activity in rats, decreasing basic electrical rhythm and blocking excitatory responses. However, inhibitory responses to vagal stimulation and ATP remain intact.
Area of Science:
- Gastroenterology
- Pharmacology
- Physiology
Context:
- Investigating the effects of chemical agents on gastric function.
- Understanding the neurochemical control of gastric motility.
Purpose:
- To determine the impact of N-methyl-N itro-N-nitrosoguanidine (MNNG) on gastric electrical activity and responses to stimulation.
Summary:
- Intragastric administration of MNNG in rats caused a marked depression of gastric wall electrical activity.
- This included reduced amplitude and frequency of the basic electrical rhythm, often leading to its complete cessation.
- MNNG abolished excitatory responses to vagal stimulation and carbacholine, while inhibitory responses to vagal stimulation and ATP persisted.
Impact:
- Provides insights into MNNG's specific mechanisms of action on gastric electrophysiology.
- Highlights the differential effects of MNNG on excitatory versus inhibitory gastric pathways.
- Contributes to understanding the complex regulation of gastric function and potential drug-induced alterations.