Immunoreactive somatolactin cells in the pituitary of young, migrating, spawning and spent chinook salmon, Oncorhynchus tshawytscha

Olivereau, Madeleine; Rand‐Weaver, Mariann

doi:10.1007/bf00004339

Cited by 27 publications

(10 citation statements)

References 27 publications

(25 reference statements)

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“…Similar immunohistochemical observations were obtained in Oncorhynchus nerka and O. keta [19,30] , O. niloticus [17] , M. cephalus [18] , O. bonariensis [31] and in L. niloticus [12] . In addition, seasonal changes in GnRH concentrations were observed during the reproductive cycle of Sebastes rastrelliger [52] and Myxine glutinosa [53] .…”

Section: Discussionsupporting

confidence: 80%

“…The active release of SL granules during spawning of L. ramada may indicate the involvement of SL not only in gonadal deveopment but also in energy mobilization related to reproduction, since the biological events, during spawning process, concerned with reproduction require a great deal of energy. Activated SL cells identified immunohistochemically, were seen also in spawning of Oncorhynchus nerka, O. keta and O. tshawytscha [19,30] , M. cephalus [18] and in L. niloticus [12] . Also, Somatolactin in the pituitary of blue gourami (Trichogaster trichopterus) was higher in females at low vitellogenesis compared to females with oocytes in maturation [22] .…”

Section: Discussionmentioning

confidence: 99%

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Immunohistochemical study of gonadotropin-releasing hormone and somatolactin during induced spawning of Liza ramada

Mousa

Khalil

Hashem

et al. 2017

Egyptian Journal of Histology

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Introduction: Gonadotropin releasing hormone (GnRH) is a crucial regulator of gonadal development and reproduction in fish. In addition, it is a possible secretagogue of somatolactin (SL) in teleosts. Little is known about the possible association of GnRH and SL during reproduction of Liza ramada. Aim of the work: The present study was designed to investigate the GnRH and SL immunoreactivities during inducing the final stages of maturation, ovulation and spawning of Liza ramada; to assess the possible actions of these hormones on sexual maturation and spawning of teleosts. Materials and Methods: Histological and immunohistochemical techniques were generally performed to describe the immunoreactivity of both GnRH and SL during ovarian maturation and spawning of Liza ramada. Results: The mammalian GnRH (mGnRH) cell bodies were observed in the medulla oblongata. However, SL-immunoreactive (-IR) cells were detected in the pars intermedia (PI) of the pituitary gland. The GnRH-IR nerve terminals are in close contact with SL-IR pituitary cells. Importantly, the activity of both mGnRH-IR neurons and SL-IR pituitary cells were increased as reflected with the increased cell number and size during sexual maturation and spawning. The activity of these cells was more pronounced as indicated by the increased cells number and size with more immunoreactivity in pre-spawning female. During final maturation and spawning, mGnRH-IR neurons and SL cells showed an increase in the secretory activity as reflected by their small sizes, vacuolated appearance and weak immunoreactivity. Conclusions: Taken together, these findings suggest that the close contact of mGnRH-IR terminals with SL-IR cells in the pituitary, together with the concomitant changes of GnRH and SL immunoreactivity in response to progress in the reproductive events suggest that GnRH may regulate SL release and the regulation of reproductive activity in L. ramada.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Immunohistochemical study of gonadotropin-releasing hormone and somatolactin during induced spawning of Liza ramada

Mousa

Khalil

Hashem

et al. 2017

Egyptian Journal of Histology

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“…Mitotic SL cells have been observed with lightmicroscopy in O. tshawytscha (Olivereau and Rand-Weaver 1994b).…”

Section: Discussionmentioning

confidence: 99%

Ontogeny of immunoreactive somatolactin cells in the pituitary of gilthead sea bream ( Sparus aurata L., Teleostei)

Villaplana

Ayala

Hernández

et al. 1997

Anatomy and Embryology

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This is the first report on the identification of somatolactin (SL) cells during the early developmental stages of the teleost fish Sparus aurata. The SL cells were followed from newly hatched until 46 months. SL cells were immunocytochemically identified at light microscopical level with anti-cod SL in the developing pituitary using the peroxidase-antiperoxidase method. SL cells first appeared in newly hatched specimens, in which the pituitary gland lacked the neurohypophysis. They were scarce and located from the middle to the posterior region of the adenohypophysis. As the fish developed, the cells progressively increased in number and surrounded the developing neurohypophysis, which could be distinguised from 12-day-old larvae onwards in the caudal region of the gland. From 51 days onwards, SL cells were found in a discontinuous layer surrounding the neurohypophysis branches that entered the pars intermedia as clustered or isolated cells among non-SL-immunoreactive cells of the pars intermedia, and in the proximal pars distalis. The somatolactin-immunoreactive cells are periodic acid-Schiff-positive only in the adult stages. These data confirm, previous findings concerning the presence of two molecular forms of SL, glycosylated and nonglycosylated, in this species.

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“…Changes in morphology and activity of GH, PRL (Power, 1992) and SL (Olivereau and Rand-Weaver, 1994b) cells were associated with the different life stages. In juvenile chum salmon, larger GH cells were weakly stained compared with smaller ones (Salam et al, 1999).…”

Section: Discussionmentioning

confidence: 98%

Immunocytochemical Analysis of Pituitary Cells in Pre-spawning Chum Salmon

et al. 2000

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ABSTRACT-Pituitary hormones regulate various physiological functions during spawning migration in salmonid. Cytological features of pituitary cells were therefore immunocytochemically examined by use of antisera against homologous hormones in pre-spawning chum salmon (Oncorhynchus keta) caught from Ishikari Bay and the Chitose River in October, 1996. Immunoreactivity and sizes of pituitary cells were determined by a computer-aided image analyzing technique. Immunoreactivity in growth hormone (GH) cells was stronger with enlarged cell sizes in freshwater (FW) fish than in seawater (SW) ones of both sexes. Majority of prolactin (PRL) cells also had significantly stronger immunoreactivity with enlarged cell sizes in FW fish than in SW animals of both sexes. Immunoreactivity in somatolactin (SL) cells was markedly stronger with enlarged cell sizes in FW fish than in SW ones of both males and females. In addition, greater portions of SL cells were strongly stained in FW animals than in SW ones. A greater portion of gonadotropin (GTH) I cells had stronger immunoreactivity with reduced cell sizes in FW fish of both sexes, when compared with SW fish. Conversely, GTH II cells had significantly stronger immunoreactivity with enlarged cell sizes in FW ones of both sexes. In proopiomelanocortin (POMC)-derived hormone producing cells, adrenocorticotropin (ACTH) cells had stronger immunoreactivity in FW animals of both sexes, while cell sizes did not change. In melanotropes, the cells immunoreactive to α-melanophore stimulating hormone (α-MSH) antiserum had stronger immunoreactivity with reduced cell sizes only in FW males, while the cells immunoreactive to β-endorphin antiserum had stronger immunoreactivity with reduced cell sizes in FW fish than in SW animals of both sexes. Implication of these results was discussed along with previous reports on gene expression of pituitary hormone precursors.

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Immunoreactive somatolactin cells in the pituitary of young, migrating, spawning and spent chinook salmon, Oncorhynchus tshawytscha

Cited by 27 publications

References 27 publications

Immunohistochemical study of gonadotropin-releasing hormone and somatolactin during induced spawning of Liza ramada

Immunohistochemical study of gonadotropin-releasing hormone and somatolactin during induced spawning of Liza ramada

Ontogeny of immunoreactive somatolactin cells in the pituitary of gilthead sea bream ( Sparus aurata L., Teleostei)

Immunocytochemical Analysis of Pituitary Cells in Pre-spawning Chum Salmon

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