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Updated: Jan 30, 2026
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Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice
Published on: October 23, 2016
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Sinoatrial node remodels in chronic sleep-restricted rats
Fatemeh Karimi1,2, Ali Rafati1,3, Ali Noorafshan1,2
1a Histomorphometry and Stereology Research Center , Shiraz University of Medical Sciences , Shiraz , Iran.
Chronobiology International
|January 25, 2019
Summary
Chronic sleep restriction (CSR) causes significant enlargement of Sinoatrial (SA) node cells and connective tissue in rats. This study reveals structural SA node changes linked to sleep deprivation without affecting cell numbers.
Area of Science:
- Cardiovascular Physiology
- Sleep Science
- Cell Biology
Background:
- Chronic sleep restriction (CSR) is a known risk factor for cardiovascular diseases.
- Structural alterations in Sinoatrial (SA) node cells due to CSR remain understudied.
- The SA node is crucial for regulating heart rate.
Purpose of the Study:
- To investigate the impact of CSR on the structural integrity of the SA node.
- To quantify changes in SA node volume and cellular components using stereological methods.
- To assess if CSR affects the number of main SA node cells.
Main Methods:
- Adult male Sprague-Dawley rats were subjected to 21 days of CSR, grid-floor, or control conditions.
- CSR was induced using a multiplatform technique to limit REM sleep.
- Stereological techniques were employed to evaluate SA node volume, cell volume, and connective tissue volume.
Main Results:
- CSR significantly increased SA node total volume (60%), main node cell volume (47%), connective tissue volume (68%), and mean node cell volume (51%) compared to controls (p < 0.05).
- No significant structural changes were observed in the grid-floor or control groups.
- The total number of main SA node cells remained constant across all experimental groups.
Conclusions:
- Chronic sleep restriction induces significant hypertrophic changes in the rat SA node structure.
- These structural alterations occur without a change in the population of main SA node cells.
- CSR-induced SA node hypertrophy may contribute to cardiovascular complications.
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