| Streptozotocin diabetes modifies arterial pressure and baroreflex sensitivity in rats. | |
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MedLine Citation:
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PMID: 8520549 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Although an increased prevalence of hypertension is associated with insulin-dependent diabetes, little is known about the effect of streptozotocin (STZ) diabetes on arterial pressure (AP) regulation in rats. Changes in AP induced by STZ, as well as associated factors in blood pressure regulation such as baroreflex sensitivity, plasma renin activity (PRA), plasma glucose and insulin levels and endothelium participation, were studied in male Wistar rats weighing 287 +/- 10 g. The same seven conscious rats were used for all measurements before and after STZ diabetes. AP pulses were stored on a videotape recorder and processed by a data acquisition system. Baroreflex sensitivity was evaluated by measuring heart rate (HR) changes induced by AP variations produced by phenylephrine and sodium nitroprusside injection. The effect of inhibition of nitric oxide synthesis with NG-nitro-L-arginine methyl ester (L-NAME, 10 mg/kg i.v. bolus plus infusion at 20 mg kg-1 h-1) on AP was evaluated in another set of rats (6 normal and 5 submitted to STZ treatment). STZ induced hyperglycemia (306 +/- 19 mg/dl), a reduction in mean arterial pressure (MAP, from 116 +/- 5 to 101 +/- 4 mmHg) and no changes in HR (320 +/- 10 vs 298 +/- 14 bpm). The tachycardic response to arterial pressure decreases was impaired (-2.29 +/- 0.5 vs -4.5 +/- 0.7 bpm/mmHg, in control) while the bradycardic response to arterial pressure increases was unchanged. Pressure responsiveness to phenylephrine was impaired after STZ (3.78 +/- 0.4 vs 6.73 +/- 0.8 mmHg microU-1 ml-1, in control).(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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C Y Maeda; T G Fernandes; F Lulhier; M C Irigoyen |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Brazilian journal of medical and biological research = Revista brasileira de pesquisas médicas e biológicas / Sociedade Brasileira de Biofísica ... [et al.] Volume: 28 ISSN: 0100-879X ISO Abbreviation: Braz. J. Med. Biol. Res. Publication Date: 1995 Apr |
Date Detail:
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Created Date: 1996-01-24 Completed Date: 1996-01-24 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8112917 Medline TA: Braz J Med Biol Res Country: BRAZIL |
Other Details:
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Languages: eng Pagination: 497-501 Citation Subset: IM |
Affiliation:
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Departamento de Fisiologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Baroreflex* / drug effects Blood Glucose / analysis Blood Pressure* / drug effects Cardiotonic Agents / pharmacology Diabetes Mellitus, Experimental / physiopathology* Heart Rate / drug effects Insulin / blood Male Phenylephrine / pharmacology Rats Rats, Wistar Renin / blood |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Cardiotonic Agents; 11061-68-0/Insulin; 59-42-7/Phenylephrine; EC 3.4.23.15/Renin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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