Localization of leptin receptor-like immunoreactivity in the corticotropes, somatotropes, and gonadotropes in the ovine anterior pituitary

J. Iqbal, S. Pompolo, R. V. Considine, I. J. Clarke

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

Leptin is a secreted product of the adipocytes that regulates a variety of functions. The presence of the leptin receptor (LR) has been demonstrated in the endocrine and neuroendocrine tissue, but only limited information is available regarding cell-specific expression in the anterior pituitary gland. We have used double-label immunofluorescence histochemistry to study the distribution of LR-like immunoreactivity (LR-ir) in the corticotropes, somatotropes, and gonadotropes of the ovine anterior pituitary. LR-ir was found in 34% of cells in the pars distalis and 94% of the cells in the pars tuberalis. In the pars distalis, LR-ir was present in 27% of corticotropes, 69% of somatotropes, and 29% of gonadotropes. In contrast, 90% of the gonadotropes in the pars tuberalis were immunopositive for LR. There was no alteration in the number of gonadotropes containing LR-ir during the various phases of the estrous cycle (n = 3/group) in the pars distalis (luteal phase, 36%; follicular phase, 32%; and estrous phase, 32%). In conclusion, we show that, in the pars distalis, LR-ir is expressed to a greater extent in the somatotropes than in the gonadotropes or corticotropes. This is in accordance with the documented effects of leptin on pituitary GH secretion. The differential expression of LR-ir between the gonadotropes of the pars distalis and pars tuberalis probably reflects the different phenotypes of the cells in these two regions. Lower levels of LR-ir expression in gonadotropes and corticotropes of the pars distalis may suggest that leptin does not substantially influence these particular cells, at least in this species.

Original languageEnglish (US)
Pages (from-to)1515-1520
Number of pages6
JournalEndocrinology
Volume141
Issue number4
DOIs
StatePublished - Jan 1 2000

Fingerprint

Leptin Receptors
Sheep
Leptin
Anterior Pituitary Gland
Follicular Phase
Estrous Cycle
Luteal Phase
Adipocytes
Fluorescent Antibody Technique
Phenotype

ASJC Scopus subject areas

  • Endocrinology

Cite this

Localization of leptin receptor-like immunoreactivity in the corticotropes, somatotropes, and gonadotropes in the ovine anterior pituitary. / Iqbal, J.; Pompolo, S.; Considine, R. V.; Clarke, I. J.

In: Endocrinology, Vol. 141, No. 4, 01.01.2000, p. 1515-1520.

Research output: Contribution to journalArticle

@article{e8b0a997e53444c69b96ca8a1739ba64,
title = "Localization of leptin receptor-like immunoreactivity in the corticotropes, somatotropes, and gonadotropes in the ovine anterior pituitary",
abstract = "Leptin is a secreted product of the adipocytes that regulates a variety of functions. The presence of the leptin receptor (LR) has been demonstrated in the endocrine and neuroendocrine tissue, but only limited information is available regarding cell-specific expression in the anterior pituitary gland. We have used double-label immunofluorescence histochemistry to study the distribution of LR-like immunoreactivity (LR-ir) in the corticotropes, somatotropes, and gonadotropes of the ovine anterior pituitary. LR-ir was found in 34{\%} of cells in the pars distalis and 94{\%} of the cells in the pars tuberalis. In the pars distalis, LR-ir was present in 27{\%} of corticotropes, 69{\%} of somatotropes, and 29{\%} of gonadotropes. In contrast, 90{\%} of the gonadotropes in the pars tuberalis were immunopositive for LR. There was no alteration in the number of gonadotropes containing LR-ir during the various phases of the estrous cycle (n = 3/group) in the pars distalis (luteal phase, 36{\%}; follicular phase, 32{\%}; and estrous phase, 32{\%}). In conclusion, we show that, in the pars distalis, LR-ir is expressed to a greater extent in the somatotropes than in the gonadotropes or corticotropes. This is in accordance with the documented effects of leptin on pituitary GH secretion. The differential expression of LR-ir between the gonadotropes of the pars distalis and pars tuberalis probably reflects the different phenotypes of the cells in these two regions. Lower levels of LR-ir expression in gonadotropes and corticotropes of the pars distalis may suggest that leptin does not substantially influence these particular cells, at least in this species.",
author = "J. Iqbal and S. Pompolo and Considine, {R. V.} and Clarke, {I. J.}",
year = "2000",
month = "1",
day = "1",
doi = "10.1210/endo.141.4.7433",
language = "English (US)",
volume = "141",
pages = "1515--1520",
journal = "Endocrinology",
issn = "0013-7227",
publisher = "The Endocrine Society",
number = "4",

}

TY - JOUR

T1 - Localization of leptin receptor-like immunoreactivity in the corticotropes, somatotropes, and gonadotropes in the ovine anterior pituitary

AU - Iqbal, J.

AU - Pompolo, S.

AU - Considine, R. V.

AU - Clarke, I. J.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - Leptin is a secreted product of the adipocytes that regulates a variety of functions. The presence of the leptin receptor (LR) has been demonstrated in the endocrine and neuroendocrine tissue, but only limited information is available regarding cell-specific expression in the anterior pituitary gland. We have used double-label immunofluorescence histochemistry to study the distribution of LR-like immunoreactivity (LR-ir) in the corticotropes, somatotropes, and gonadotropes of the ovine anterior pituitary. LR-ir was found in 34% of cells in the pars distalis and 94% of the cells in the pars tuberalis. In the pars distalis, LR-ir was present in 27% of corticotropes, 69% of somatotropes, and 29% of gonadotropes. In contrast, 90% of the gonadotropes in the pars tuberalis were immunopositive for LR. There was no alteration in the number of gonadotropes containing LR-ir during the various phases of the estrous cycle (n = 3/group) in the pars distalis (luteal phase, 36%; follicular phase, 32%; and estrous phase, 32%). In conclusion, we show that, in the pars distalis, LR-ir is expressed to a greater extent in the somatotropes than in the gonadotropes or corticotropes. This is in accordance with the documented effects of leptin on pituitary GH secretion. The differential expression of LR-ir between the gonadotropes of the pars distalis and pars tuberalis probably reflects the different phenotypes of the cells in these two regions. Lower levels of LR-ir expression in gonadotropes and corticotropes of the pars distalis may suggest that leptin does not substantially influence these particular cells, at least in this species.

AB - Leptin is a secreted product of the adipocytes that regulates a variety of functions. The presence of the leptin receptor (LR) has been demonstrated in the endocrine and neuroendocrine tissue, but only limited information is available regarding cell-specific expression in the anterior pituitary gland. We have used double-label immunofluorescence histochemistry to study the distribution of LR-like immunoreactivity (LR-ir) in the corticotropes, somatotropes, and gonadotropes of the ovine anterior pituitary. LR-ir was found in 34% of cells in the pars distalis and 94% of the cells in the pars tuberalis. In the pars distalis, LR-ir was present in 27% of corticotropes, 69% of somatotropes, and 29% of gonadotropes. In contrast, 90% of the gonadotropes in the pars tuberalis were immunopositive for LR. There was no alteration in the number of gonadotropes containing LR-ir during the various phases of the estrous cycle (n = 3/group) in the pars distalis (luteal phase, 36%; follicular phase, 32%; and estrous phase, 32%). In conclusion, we show that, in the pars distalis, LR-ir is expressed to a greater extent in the somatotropes than in the gonadotropes or corticotropes. This is in accordance with the documented effects of leptin on pituitary GH secretion. The differential expression of LR-ir between the gonadotropes of the pars distalis and pars tuberalis probably reflects the different phenotypes of the cells in these two regions. Lower levels of LR-ir expression in gonadotropes and corticotropes of the pars distalis may suggest that leptin does not substantially influence these particular cells, at least in this species.

UR - http://www.scopus.com/inward/record.url?scp=0034457830&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034457830&partnerID=8YFLogxK

U2 - 10.1210/endo.141.4.7433

DO - 10.1210/endo.141.4.7433

M3 - Article

C2 - 10746658

AN - SCOPUS:0034457830

VL - 141

SP - 1515

EP - 1520

JO - Endocrinology

JF - Endocrinology

SN - 0013-7227

IS - 4

ER -