Abstract:
:Application of alpha-MSH immunohistochemistry to the brain of elasmobranchs (Scyliorhinus torazame and Etmopterus brachyurus) demonstrated a marked species difference concerning the distribution of the alpha-MSH-like molecule in the brain. In S. torazame, alpha-MSH-like immunoreactive cells were present in the hypothalamus, mainly in the tuberculum posterius and the nucleus lateralis tuberis, and also in the distal and neurointermediate lobes of the hypophysis. Labeled varicose fibers were densely distributed in the hypothalamus, but they were sparse or absent in other portions of the brain. In striking contrast to the results for S. torazame, the immunoreactivity in the E. brachyurus brain was associated exclusively with the glial system, represented by astrocytes and tanycytes, throughout the central nervous system; no immunoreactivity was found in the neuronal elements. In the E. brachyurus hypophysis, the labeled cells were present in the distal and intermediate lobes, similarly to their presence in S. torazame, but in the intermediate lobe the immunoreactivity was confined to the peripheral cell cord closely adjacent to the neural lobe. The present findings are the first as regards the occurrence of alpha-MSH-like immunoreactivity in the glial system of the central nervous system of vertebrates and suggest diversity of expression and/or processing of proopiomelanocortin in the brain of elasmobranchs.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Chiba Adoi
10.1006/gcen.2001.7628keywords:
subject
Has Abstractpub_date
2001-06-01 00:00:00pages
287-95issue
3eissn
0016-6480issn
1095-6840pii
S0016-6480(01)97628-2journal_volume
122pub_type
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journal_title:General and comparative endocrinology
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