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Differential expression of catecholamine synthetic enzymes in the caudal ventral pons
Author(s) -
Goodchild Ann K.,
Phillips Jacqueline K.,
Lipski Janusz,
Pilowsky Paul M.
Publication year - 2001
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.1328
Subject(s) - catecholaminergic cell groups , biology , tyrosine hydroxylase , retrograde tracing , medulla oblongata , colocalization , catecholaminergic , medicine , phenylethanolamine n methyltransferase , adrenergic neurons , dopamine , phenylethanolamine , endocrinology , pons , dopamine transporter , catecholamine , spinal cord , dopaminergic , neuroscience , central nervous system , biochemistry , adrenergic , receptor
The analysis of colocalization of multiple catecholamine biosynthetic enzymes within the ventrolateral part of the medulla oblongata of the rat revealed distinct subpopulations of neurons within the C1 region (Phillips et al., J Comp Neurol 2001, 432:20–34). In extending this study to include the caudal pons, it was shown for the first time that the A5 cell group could be distinguished by the presence of immunoreactivity to tyrosine hydroxylase (TH), aromatic l‐amino acid decarboxylase (AADC), and dopamine beta hydroxylase (DBH). A novel cell group was also identified. The cells within this new group were immunoreactive to DBH but not TH, AADC, or phenylethanolamine N‐methyltransferase (PNMT) and will be referred to as the TH‐, DBH+ cell group. The TH‐, DBH+ neurons were not immunoreactive for either the dopamine or noradrenaline transporters, suggesting that these neurons do not take up these transmitters. A5 neurons were immunoreactive for the noradrenaline transporter but not the dopamine transporter (as previously shown). Retrograde tracing with cholera toxin B revealed that the TH‐, DBH+ neurons do not project to the thoracic spinal cord or to the rostral ventrolateral medulla, but A5 neurons do. A calbindin immunoreactive cell group is located in a region overlapping TH‐, DBH+ cell group. However, only a few neurons were immunoreactive for both markers. The physiological role of the TH‐, DBH+ cell group remains to be determined. J. Comp. Neurol. 438:457–467, 2001. © 2001 Wiley‐Liss, Inc.