Cocaine- and amphetamine-regulated transcript in catecholamine and noncatecholamine presympathetic vasomotor neurons of rat rostral ventrolateral medulla

被引:41
作者
Burman, KJ
Sartor, DM
Verberne, AJM
Llewellyn-Smith, IJ
机构
[1] Flinders Univ S Australia, Ctr Neurosci, Bedford Pk, SA 5042, Australia
[2] Univ Melbourne, Dept Med, Clin Pharmacol & Therapeut Unit, Heidelberg, Vic 3084, Australia
关键词
blood pressure regulation; neurotransmitter; cotransmitter; juxtacellular labeling; immunohistochemistry; sympathetic vasomotor;
D O I
10.1002/cne.20198
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Presympathetic vasomotor adrenergic (C1) and nonadrenergic (non-C1) neurons in the rostral ventrolateral medulla (RVLM) provide the main excitatory drive to cardiovascular sympathetic preganglionic neurons in the spinal cord. C1 and non-Cl neurons contain cocaine- and amphetamine-regulated transcript (CART), suggesting that CART may he a common marker for RVLM presympathetic neurons. To test this hypothesis, we first used double-immunofluorescence staining for CART and tyrosine hydroxylase (TH) to quantify CART-immunoreactive (-IR) catecholamine and noncatecholamine neurons in the C1 region. Next, we quantified the proportion of CART-IR RVLM neurons that expressed Fos in response to a hypotensive stimulus, using peroxidase immunohistochemistry for Fos and dual immunofluorescence for CART and TH. Finally, we fluorescently detected CART immunoreactivity in electro-physiologically identified, juxtacellularly labeled RVLM presympathetic neurons. In the RVLM, 97% of TH-IR neurons were CART-IR, and 74% of CART-IR neurons were TH-IR. Nitroprusside infusion significantly increased the number of Fos-IR RVLM neurons compared with saline controls. In nitroprusside-treated rats, virtually all Fos/TH neurons in the RVLM were immunoreactive for CART (98% +/- 1.3%, SD; n = 7), whereas 29% +/- 8.3% of CART-positive, TH-negative neurons showed Fos immunoreactivity. Six fast (2.8-5.8 m/second, noneatecholamine)-, two intermediate (2.1 and 2.2 m/second)-, and five slow (<1 m/second, catecholamine)-conducting RVLM presympathetic vasomotor neurons were juxtacellularly labeled. After fluorescent detection of CART and biotinamide, all 13 neurons were found to be CART-IR. These results suggest that, in rat RVLM, all catecholamine and noncatecholamine presympathetic vasomotor neurons contain CART. (C) 2004 Wiley-Liss, Inc.
引用
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页码:19 / 31
页数:13
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