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Localization of urotensin I- and corticotropin-releasing factor-like immunoreactivity in the central nervous system of Catostomus commersoni.

Abstract：

:The distribution of urotensin I (UI) and corticotropin-releasing factor (CRF) immunoreactive (IR) structures was studied in the central nervous system (CNS) of the white sucker using the peroxidase-antiperoxidase immunocytochemical procedure. The close sequence homology between both peptides resulted in a high degree of crossreactivity. This was resolved by saturating the antisera solutions with heterologous antigens and specificity tests were done by adding excess of homologous peptides. UI immunoreactivity was seen in all of the identifiable caudal spinal cord neurosecretory cells, in their processes projecting to the urophysis, in thin beaded fibres coursing along the spinal cord, in brain stem, hypothalamus, proximal pars distalis and, especially, in the telencephalon. Some IR-UI specific and IR-CRF specific parvocellular neurons were also identified in the caudo-ventral tuberal region and ventral telencephalon. The IR-CRF was mainly present in parvocellular and magnocellular perikarya of the nucleus preopticus and in the preoptic-neurohypophysial pathway. Dense networks of IR-CRF reacting beaded fibres were also located in the lateral and posterior recessus nuclei. In the pituitary, IR-CRF fibre bundles were seen mainly in the neurointermediate lobe and in the rostral pars distalis. The cells of origin of the extraurophyseal system of IR-UI fibres in the sucker CNS have not been identified. The distribution of CRF immunostaining correlates well with the documented knowledge of CNS structures involved in the control of ACTH secretion in the goldfish. The probability of the occurrence of two UI-CRF related molecules, or of two different forms resulting from a common precursor molecule, forming two separate neuronal systems in the sucker CNS seems likely.

journal_name

Peptides

journal_title

Peptides

authors

Yulis CR,Lederis K,Wong KL,Fisher AW

doi

10.1016/0196-9781(86)90065-3

subject

Has Abstract

pub_date

1986-01-01 00:00:00

pages

79-86

issue

1

eissn

0196-9781

issn

1873-5169

pii

0196-9781(86)90065-3

journal_volume

7

pub_type

杂志文章

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