open access

Vol 53, No 3 (2015)
Original paper
Submitted: 2015-01-22
Accepted: 2015-09-07
Published online: 2015-09-08
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Histological changes of testes in growth hormone transgenic mice with high plasma level of GH and insulin-like growth factor-1

Katarzyna Piotrowska, Sylwia Sluczanowska-Glabowska, Magda Kucia, Andrzej Bartke, Maria Laszczynska, Mariusz Z. Ratajczak
DOI: 10.5603/fhc.a2015.0024
·
Pubmed: 26348370
·
Folia Histochem Cytobiol 2015;53(3):249-258.

open access

Vol 53, No 3 (2015)
ORIGINAL PAPERS
Submitted: 2015-01-22
Accepted: 2015-09-07
Published online: 2015-09-08

Abstract

Introduction. Overexpression of growth hormone (GH) leads to increase in insulin-like growth factor-1 (IGF-1) plasma level, stimulation of growth and increase in body size, organomegaly and reduced body fat. The action of GH affects all the organs and transgenic mice that overexpress bovine GH (bGH mice) serve as convenient model to study somatotropic axis. Male mice overexpressing GH are fertile, however, they show reduced overall lifespan as well as reproductive life span. The aim of the study was to evaluate the morphology and expression of androgen receptor (AR) and luteinizing hormone receptor (LHR) of bGH mice testes.

Material and methods. The experiment was performed on 6 and 12 month-old bGH male mice and 6 and 12 month-old wild type (WT) littermates (8 animals in each group). The morphology of testes was evaluated on deparaffinized sections stained by the periodic acid-Schiff (PAS) method. Expression of AR and LHR was investigated by immunohistochemistry and diameters of seminiferous tubules (ST) were measured on round cross sections of ST.

Results. We noted larger testes in 6-month bGH mice as compared to normal WT littermates. The morpho­logical observations revealed essentially normal structure of Leydig cells, seminiferous epithelium and other morphological structures. However, some changes like tubules containing only Sertoli cells, tubules with arrested spermatogenesis or vacuoles in seminiferous epithelium could be attributed to the overexpression of GH. In contrast to WT mice, 12 month-old bGH mice displayed first symptoms of testicular aging. The immunoexpres­sion of AR and LHR was decreased in 12 month-old bGH males as compared to 12 month-old WT mice and younger animals.

Conclusion. Chronic exposure to elevated GH level accelerates testicular aging and thus potentially may change response of Leydig cells to LH and Sertoli and germ cells to testosterone.

Abstract

Introduction. Overexpression of growth hormone (GH) leads to increase in insulin-like growth factor-1 (IGF-1) plasma level, stimulation of growth and increase in body size, organomegaly and reduced body fat. The action of GH affects all the organs and transgenic mice that overexpress bovine GH (bGH mice) serve as convenient model to study somatotropic axis. Male mice overexpressing GH are fertile, however, they show reduced overall lifespan as well as reproductive life span. The aim of the study was to evaluate the morphology and expression of androgen receptor (AR) and luteinizing hormone receptor (LHR) of bGH mice testes.

Material and methods. The experiment was performed on 6 and 12 month-old bGH male mice and 6 and 12 month-old wild type (WT) littermates (8 animals in each group). The morphology of testes was evaluated on deparaffinized sections stained by the periodic acid-Schiff (PAS) method. Expression of AR and LHR was investigated by immunohistochemistry and diameters of seminiferous tubules (ST) were measured on round cross sections of ST.

Results. We noted larger testes in 6-month bGH mice as compared to normal WT littermates. The morpho­logical observations revealed essentially normal structure of Leydig cells, seminiferous epithelium and other morphological structures. However, some changes like tubules containing only Sertoli cells, tubules with arrested spermatogenesis or vacuoles in seminiferous epithelium could be attributed to the overexpression of GH. In contrast to WT mice, 12 month-old bGH mice displayed first symptoms of testicular aging. The immunoexpres­sion of AR and LHR was decreased in 12 month-old bGH males as compared to 12 month-old WT mice and younger animals.

Conclusion. Chronic exposure to elevated GH level accelerates testicular aging and thus potentially may change response of Leydig cells to LH and Sertoli and germ cells to testosterone.

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Keywords

GH transgenic mice; testis histology; androgen receptor; LHR; IHC

About this article
Title

Histological changes of testes in growth hormone transgenic mice with high plasma level of GH and insulin-like growth factor-1

Journal

Folia Histochemica et Cytobiologica

Issue

Vol 53, No 3 (2015)

Article type

Original paper

Pages

249-258

Published online

2015-09-08

DOI

10.5603/fhc.a2015.0024

Pubmed

26348370

Bibliographic record

Folia Histochem Cytobiol 2015;53(3):249-258.

Keywords

GH transgenic mice
testis histology
androgen receptor
LHR
IHC

Authors

Katarzyna Piotrowska
Sylwia Sluczanowska-Glabowska
Magda Kucia
Andrzej Bartke
Maria Laszczynska
Mariusz Z. Ratajczak

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