Reduced baroreflex sensitivity and blunted endogenous nitric oxide synthesis precede the development of hypertension in TGR(mREN2)27 rats
Transgenic TGR(mREN2)27 (TGR) rats are an animal model of fulminant hypertension characterized by an inverse circadian blood pressure profile. The present study addressed the contribution of nitric oxide (NO) synthesis and baroreflex function to hypertension and the inverse blood pressure pattern. N...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2001
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| In: |
Chronobiology international
Year: 2001, Jahrgang: 18, Heft: 2, Pages: 215-226 |
| ISSN: | 1525-6073 |
| DOI: | 10.1081/CBI-100103187 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1081/CBI-100103187
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| Verfasserangaben: | Aarón Borgonio, Stefan Pummer, Klaus Witte, and Björn Lemmer |
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| 245 | 1 | 0 | |a Reduced baroreflex sensitivity and blunted endogenous nitric oxide synthesis precede the development of hypertension in TGR(mREN2)27 rats |c Aarón Borgonio, Stefan Pummer, Klaus Witte, and Björn Lemmer |
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| 520 | |a Transgenic TGR(mREN2)27 (TGR) rats are an animal model of fulminant hypertension characterized by an inverse circadian blood pressure profile. The present study addressed the contribution of nitric oxide (NO) synthesis and baroreflex function to hypertension and the inverse blood pressure pattern. NO synthesis was measured at four different times of day indirectly by excretion of NO metabolites (NOx: NO−2 and NO−3) in the urine of 5- and 11-week-old TGR and Sprague-Dawley (SPRD) controls. Blood pressure, heart rate, and motor activity were recorded in age-matched rats of both strains using an implantable telemetry system. Beat-to-beat recording of blood pressure and pulse interval was performed hourly in 6-week-old animals over 24h. From these data, baroreflex sensitivity (BRS) was calculated by linear regression of spontaneous fluctuations of blood pressure and corresponding changes of pulse interval. Baroreflex sensitivity was lower in prehypertensive TGR rats than in SPRD rats, and the reduction was restricted to the daily resting period. In both strains, NOx excretion showed circadian rhythmicity, with peak values during the activity period at night. Interestingly, excretion of NOx was reduced during the resting period in 5-week-old TGR rats prior to the development of hypertension. Impairment of NO synthesis and baroreflex function precede the development of hypertension in TGR rats. The reduction of both parameters was restricted to the resting period and, therefore, could be involved in the development of the inverse circadian blood pressure profile of TGR rats. | ||
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| 650 | 4 | |a TGR(mRen2)27 | |
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