Abstract:
:The goal of this study was to determine if the dorsal noradrenergic bundle (DNAB) plays an essential role in mediating increased plasma renin activity (PRA) and hypothalamic activation, as indicated by increased Fos expression, in response to a small volume blood loss in unanesthetized animals. Male Sprague-Dawley rats were prepared with bilateral 6-hydroxydopamine or sham lesions of the dorsal noradrenergic bundle. In both groups of animals, blood pressure decreased by only 10-15 mmHg following hemorrhage (10 ml/kg over 15 min). Plasma renin activity increased similarly in both groups after 5 ml/kg blood loss, but showed a significantly greater increase after 10 ml/kg blood loss in animals with 6-hydroxydopamine lesions than in those with sham lesions (increase of 13.8 +/- 2.0 ng/ml/h versus 8.4 +/- 1.2 ng/ml/h; P < 0.025). There were numerous Fos-immunoreactive cell nuclei in the supraoptic nucleus (SON) and parvicellular paraventricular hypothalamic nucleus (PVN) of hemorrhaged animals. The number of Fos-positive neurons did not differ between groups, indicating that the dorsal noradrenergic bundle does not convey the primary drive for supraoptic and paraventricular nucleus activation during blood loss. However, one or more of the forebrain regions innervated by the dorsal noradrenergic bundle may attenuate the sympathetic outflow that initiates renin release in response to hemorrhage.
journal_name
Brain Res Bulljournal_title
Brain research bulletinauthors
Jaworski RL,Blair MLdoi
10.1016/j.brainresbull.2004.03.008keywords:
subject
Has Abstractpub_date
2004-07-15 00:00:00pages
451-9issue
6eissn
0361-9230issn
1873-2747pii
S0361923004001042journal_volume
63pub_type
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