当前位置： SCI文献检索 > GENERAL AND COMPARATIVE ENDOCRINOLOGY期刊下所有文献 > Gonadotropin-releasing hormone (GnRH) in bony fish that are phylogenetically ancient: reedfish (Calamoichthys calabaricus), sturgeon (Acipenser transmontanus), and alligator gar (Lepisosteus spatula).

Gonadotropin-releasing hormone (GnRH) in bony fish that are phylogenetically ancient: reedfish (Calamoichthys calabaricus), sturgeon (Acipenser transmontanus), and alligator gar (Lepisosteus spatula).

Abstract：

:Three species of fish that are phylogenetically older than other members of the bony fish lineage were selected to determine if gonadotropin-releasing hormone (GnRH) is present in their brains. Brain extracts were prepared from each species and found to contain immunoreactive (ir) GnRH. To further characterize the molecular forms of GnRH in each species, the extracts were injected into a high pressure liquid chromatograph (HPLC). The elution time of each GnRH-like form was compared to those of the synthetic forms of the five known GnRHs. Several antisera were used to detect both the synthetic and unknown GnRHs in the HPLC fractions. All three species of fish had two forms of GnRH: a dominant form that is mammalian GnRH-like (mGnRH), and a minor form of irGnRH material that is similar to chicken GnRH-II (cGnRH-II). The other known forms of GnRH (salmon, lamprey, and chicken-I) were not detected. The appearance in these ancient bony fish of a mammalian-like form of GnRH, which has not been found in the jawless or cartilaginous fish studied to date, suggests that mGnRH arose in a common phylogenetic ancestor of the bony fish and tetrapods. This mGnRH-like molecule is known to have been conserved in the amphibian and mammalian lineage, but not in the reptilian or avian line. In addition, the presence of a cGnRH-II-like molecule in the bony fish examined here, and in the cartilaginous fish studied earlier, implies that this form of GnRH may have been present in an ancestor common to both of these classes of fish.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Sherwood NM,Doroshov S,Lance V

doi

10.1016/0016-6480(91)90063-c

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

44-57

issue

1

eissn

0016-6480

issn

1095-6840

pii

0016-6480(91)90063-C

journal_volume

84

pub_type

杂志文章

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