Lesions of the C1 catecholaminergic neurons of the ventrolateral medulla in rats using anti-DβH-saporin

Christopher (Chris) Madden, Ito Satoru, Linda Rinaman, Ronald G. Wiley, Alan F. Sved

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Abstract

Phenylethanolamine-N-methyltrans ferase (PNMT)-containing neurons in the rostral ventrolateral medulla (RVLM) are believed to play a role in cardiovascular regulation. To determine whether injection of anti-dopamine β-hydroxylase (DβH)-saporin directly into the RVLM in rats could selectively destroy these cells and thereby provide an approach for evaluating their role in cardiovascular regulation, we studied rats 2 wk after unilateral injection of 21 ng anti-DβH-saporin into the RVLM. There was an ~90% reduction in the number of PNMT-positive neurons in the RVLM, although the number of non-C1, spinally projecting barosensitive neurons of this area was not altered. The A5 cell group was the only other population of DβH-containing cells that was significantly depleted. The depressor response evoked by injection of tyramine into the RVLM was abolished by prior injection of toxin. The pressor response evoked by injection of glutamate into the RVLM was attenuated ipsilateral to the toxin injection but was potentiated contralateral to the toxin injection. Thus anti-DβH-saporin can be used to make selective lesions of PNMT-containing cells, allowing for the evaluation of their role in cardiovascular regulation.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume277
Issue number4 46-4
Publication statusPublished - 1999
Externally publishedYes

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Keywords

  • Blood pressure
  • Dopamine β- hydroxylase
  • Phenylethanolamine-N-methyltransferase

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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