Abstract
Perinatal taurine excess or deficiency influences adult health and disease, especially relative to the autonomic nervous system. This study tests the hypothesis that perinatal taurine exposure influences adult autonomic nervous system control of arterial pressure in response to acute electrical tooth pulp stimulation. Female Sprague–Dawley rats were fed with normal rat chow with 3% β-alanine (taurine depletion, TD), 3% taurine (taurine supplementation, TS), or water alone (control, C) from conception to weaning. Their male offspring were fed with normal rat chow and tap water throughout the experiment. At 8–10 weeks of age, blood chemistry, arterial pressure, heart rate, and renal sympathetic nerve activity were measured in anesthetized rats. Age, body weight, mean arterial pressure, heart rate, plasma electrolytes, blood urea nitrogen, plasma creatinine, and plasma cortisol were not significantly different among the three groups. Before tooth pulp stimulation, low- (0.3–0.5 Hz) and high-frequency (0.5–4.0 Hz) power spectral densities of arterial pressure were not significantly different among groups while the power spectral densities of renal sympathetic nerve activity were significantly decreased in TD compared to control rats. Tooth pulp stimulation did not change arterial pressure, heart rate, renal sympathetic nerve, and arterial pressure power spectral densities in the 0.3–4.0 Hz spectrum or renal sympathetic nerve firing rate in any group. In contrast, perinatal taurine imbalance disturbed very-low-frequency power spectral densities of both arterial pressure and renal sympathetic nerve activity (below 0.1 Hz), both before and after the tooth pulp stimulation. The power densities of TS were most sensitive to ganglionic blockade and central adrenergic inhibition, while those of TD were sensitive to both central and peripheral adrenergic inhibition. The present data indicate that perinatal taurine imbalance can lead to aberrant autonomic nervous system responses in adult male rats.
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Abbreviations
- AP:
-
Arterial pressure
- C:
-
Control
- ETPS:
-
Electrical tooth pulp stimulation
- HR:
-
Heart rate
- HF:
-
High frequency
- LF:
-
Low frequency
- MAP:
-
Mean arterial pressure
- RA:
-
Renal sympathetic nerve activity
- SD:
-
Sprague–Dawley
- TD:
-
Taurine depletion
- TS:
-
Taurine supplementation
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Acknowledgments
This study was supported by a grant from the Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand and by the US National Institutes of Health (NIH) grants AT 00477 and NS057098 (JMW).
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Khimsuksri, S., Wyss, J.M., Thaeomor, A., Paphangkorakit, J., Jirakulsomchok, D., Roysommuti, S. (2013). Perinatal Taurine Exposure Programs Patterns of Autonomic Nerve Activity Responses to Tooth Pulp Stimulation in Adult Male Rats. In: El Idrissi, A., L'Amoreaux, W. (eds) Taurine 8. Advances in Experimental Medicine and Biology, vol 775. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6130-2_10
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DOI: https://doi.org/10.1007/978-1-4614-6130-2_10
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