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The tissue content of cyclic AMP in rats after microwave irradiation in vivo
Abstract:
When anesthetized rats were exposed to microwave (power output 1.3 kw, frequency 2,450 MHz), the cyclic AMP phosphodiesterase activity showed a rapid decline in the skeletal muscle, heart, trachea and lung; no activity essentially could be detected after a 30 sec irradiation. Cyclic AMP levels in these tissues also decreased rapidly to constant values within 30 sec. Concentrations of cyclic AMP in the heart, skeletal muscle, trachea and lung measured by the tissue fixation with liquid nitrogen were approximately 3, 3, 4 and 4 times higher than those after microwave irradiation, respectively. The intravenous injection of procaterol (1 mu mol/kg), a beta 2-adrenoceptor agonist, caused a 6-fold increase in the trachea cyclic AMP level when measured after microwave fixation but only a 2-fold increase when measured after liquid nitrogen fixation. It is concluded that rapid tissue fixation by microwave irradiation may provide a useful means for obtaining reliable values of the tissue cyclic AMP content.
Insights
Microwave irradiation rapidly decreases cyclic AMP phosphodiesterase activity and cyclic AMP levels in rat tissues. Rapid microwave fixation offers a reliable method for measuring tissue cyclic AMP content.
Area of Science:
- Biochemistry
- Physiology
- Pharmacology
Background:
- Cyclic AMP (adenosine monophosphate) is a crucial second messenger involved in various cellular processes.
- Accurate measurement of cyclic AMP levels is essential for understanding cellular signaling pathways.
- Rapid degradation of cyclic AMP in tissues poses a challenge for accurate quantification.
Purpose of the Study:
- To investigate the effect of microwave irradiation on cyclic AMP phosphodiesterase activity and cyclic AMP levels in rat tissues.
- To evaluate the efficacy of microwave irradiation as a rapid tissue fixation method for preserving cyclic AMP content.
- To compare cyclic AMP levels measured after microwave fixation versus liquid nitrogen fixation.
Main Methods:
- Anesthetized rats were exposed to microwave irradiation (1.3 kW, 2,450 MHz).
- Tissue samples (skeletal muscle, heart, trachea, lung) were collected after varying irradiation times.
- Cyclic AMP levels were measured using liquid nitrogen fixation and microwave fixation.
- The effect of a beta 2-adrenoceptor agonist (procaterol) on cyclic AMP levels was assessed.
Main Results:
- Microwave irradiation caused a rapid decline in cyclic AMP phosphodiesterase activity and cyclic AMP levels within 30 seconds.
- Tissue cyclic AMP concentrations were significantly lower after microwave irradiation compared to liquid nitrogen fixation.
- Procaterol administration showed a more pronounced increase in cyclic AMP levels with microwave fixation than with liquid nitrogen fixation.
Conclusions:
- Rapid tissue fixation by microwave irradiation effectively preserves cyclic AMP content.
- Microwave irradiation is a valuable technique for obtaining reliable measurements of tissue cyclic AMP.
- This method enhances the study of cellular signaling pathways involving cyclic AMP.