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Participation of Modulating Rhythms of the Decasecond Range in Intersystem Correlation Interactions in Early Rat
S V Kuznetsov1, V A Sizonov2, L E Dmitrieva2
1I. M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia. ksv@iephb.ru.
Insights
In newborn rats, slow rhythms (D1 range) are not crucial for system interactions at day 1 but become significant by day 16. Cholinergic system activation disrupts these interactions, especially somatorespiratory ones.
Area of Science:
- Neuroscience
- Physiology
- Developmental Biology
Background:
- Intersystem somatovisceral interactions (ISI) are vital for coordinating bodily functions.
- Modulating rhythms, particularly in the decasecond (D1) range, are implicated in these interactions.
- Understanding developmental changes in ISI is crucial for grasping physiological maturation.
Purpose of the Study:
- To analyze intersystem somatovisceral interactions (ISI) mediated by decasecond (D1) range rhythms in developing rats.
- To investigate the role of cholinergic regulation in modulating these interactions during early postnatal development.
- To determine the developmental trajectory of slow-wave rhythm involvement in ISI.
Main Methods:
- Utilized spectral correlation analysis to study cardiovascular, respiratory, and somatomotor system interactions.
- Examined rats at postnatal day 1 (P1) and postnatal day 16 (P16).
- Investigated the effects of cholinergic activation (physostigmine) and blockade (muscarinic/nicotinic antagonists) on ISI.
Main Results:
- D1 range rhythms showed minimal involvement in integrative processes at P1.
- At P16, cholinergic activation significantly altered D1 range correlations, particularly impacting the somatorespiratory pair.
- Blockade of cholinoreceptors did not affect slow-wave correlations (D1-low), suggesting cholinergic influence is specific.
Conclusions:
- The contribution of slow-wave components (D1 range) to ISI increases during early postnatal development.
- Cholinergic activation significantly modulates ISI, with the somatorespiratory system being most affected.
- Cholinergic system changes do not directly influence ISI mediated by the slowest D1-low rhythms.
Abstract:
On newborn non-narcotized 1-day-old (P1) and 16-day-old (P16) rats, a detailed analysis of intersystem somatovisceral interactions (ISI) mediated by decasecond (D1, 5-50 sec) range modulating rhythms was performed. Correlation interactions of the main body systems - cardiovascular, respiratory and somatomotor systems in norm and under conditions of changes in the level of cholinergic regulation were studied. Spectral correlation analysis was used to determine the participation of D1 range modulating rhythms in ISI. It was found that at P1, D1 range rhythms do not play a significant role in integrative processes. In P16 the activation of cholinergic structures, caused by the introduction of the acetylcholinesterase inhibitor physostigmine (eserine) leads to significant disturbances in the degree of correlation in the D1 range. Blockade of muscarinic and nicotinic cholinoreceptors does not alter the degree of correlation of systemic pairs in the slow-wave region (D1-low, 8-50 sec) of the D1 range. Under the influence on the cholinoreactive structures, the most significant changes in the degree of correlation in the ISI affect the somatorespiratory systemic pair. The results obtained indicate that the representation of the slow-wave components of D1 range modulating rhythms involved in the ISI increase during the first weeks of postnatal ontogeny. Changes in the level of cholinergic activation do not directly influence on ISI mediated by D1-low sub-band rhythms.
