Abstract:
:In lampreys, although gonadotropin (GTH) has not yet been isolated from the pituitary gland, the presence of GTH has been strongly suggested. To detect possible GTH in the sea lamprey (Petromyzon marinus) pituitary, two different cytochemical probes were tested: One was the use of antibodies to GTHs, and the other was the use of lectin-screening kits for demonstration of glycoconjugate in hormonal molecules. GTH-like immunoreactivity was found in cells distributed in the ventral half of the proximal pars distalis. These cells were stained intensely by all four lots of anti-ovine LH including LHbeta, and were stained moderately or weakly by several other antibodies to LH-related GTHs, such as human LHbeta, hCGbeta, amphibian LH, and sturgeon GTH IIbeta. On the other hand, there were no positive reactions in the sea lamprey pituitary using the antibodies to FSH-related GTHs, thyrotropin (TSH), or pituitary glycoprotein hormones of teleost origin. Thus, GTH-like material in the sea lamprey pituitary seems to be more closely related to mammalian-like LH, rather than to FSH or TSH, as far as immunocytochemical determinants. A total of 21 kinds of lectins was tested. Among those, GTH-positive cells were also stained positively by concanavalin A and Vicia villosa agglutinin. Thus, the present study demonstrates colocalization of LH-like immunoreactivity and glycoconjugate in cells in the ventral half of the proximal pars distalis of the sea lamprey pituitary. It is suggested that those cells are most likely to be GTH cells in the sea lamprey pituitary.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Nozaki M,Ominato K,Takahashi A,Kawauchi H,Sower SAdoi
10.1006/gcen.1998.7189subject
Has Abstractpub_date
1999-01-01 00:00:00pages
23-31issue
1eissn
0016-6480issn
1095-6840pii
S0016-6480(98)97189-1journal_volume
113pub_type
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