Detection of Prolactin Messenger RNA in Rat Anterior Pituitary by in Situ Hybridization

Overview

Journal Am J Pathol

Publisher Elsevier

Specialty Pathology

Date 1986 Oct 1

PMID 3777138

Citations 9

Authors

R V Lloyd

T D Landefeld

Affiliations

Soon will be listed here.

Abstract

The effects of chronic diethylstilbestrol treatment on rat prolactin mRNA was analyzed by in situ hybridization histochemistry. Forty-day-old female rats were treated with 10 mg diethylstilbestrol in Silastic tubes for 3, 6, and 9 weeks. Estrogen treatment for 9 weeks increased pituitary wet weight (51.6 +/- 2.4 versus 7.9 +/- 0.31 mg for controls), serum prolactin (4155 +/- 571 versus 47.1 +/- 8.9 ng/ml for controls), and the percentage of immunoreactive prolactin cells (69% +/- 3% versus 34% +/- 2% for controls). In situ hybridization studies showed an increase in rat prolactin mRNA with increasing duration of estrogen treatment. After 9 weeks of estrogen treatment, there was a 2.3-fold increase in rat prolactin mRNA. 3H-cDNA was distributed diffusely throughout the anterior pituitary in both normal and hyperplastic pituitaries. There were no separate foci of adenomatous pituitary with increased labeling or with increased immunoreactive PRL cells. Although transplantable pituitary MtT/W15 tumors secreted very large amounts of PRL, compared with pituitaries from DES-treated rats, rat prolactin mRNA as evaluated by mean grain counts was considerably less in the MtT/W15 tumor than in DES-treated pituitary cells. These results show that in situ hybridization histochemistry can be used to detect changes in rat prolactin mRNA in tissue sections from the anterior pituitary with chronic estrogen treatment and that these pituitaries show a diffuse increase in immunoreactive prolactin cells and cellular prolactin mRNA, rather than distinct adenomatous areas within the glands.

Citing Articles

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Genetic separation of tumor growth and hemorrhagic phenotypes in an estrogen-induced tumor.

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Growth hormone (GH) and prolactin (PRL) gene expression and immunoreactivity in GH- and PRL-producing human pituitary adenomas.

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Combined use of in situ hybridisation and immunocytochemistry for the investigation of prolactin gene expression in immature, pubertal, pregnant, lactating and ovariectomised rats.

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