Pituitary hyperplasia in glycoprotein hormone alpha subunit-, p18(INK4C)-, and p27(kip-1)-null mice: analysis of proteins influencing p27(kip-1) ubiquitin degradation
Most spontaneously developing hyperplastic and neoplastic lesions of the pituitary occur in the anterior pituitary. Targeted disruption of various cell-cycle proteins, including Rb, p27(kip1) (p27), and p18(INK4c) (p18), is associated with intermediate lobe pituitary hyperplasia. To develop a model...
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Published in | The American journal of pathology Vol. 160; no. 3; pp. 1171 - 1179 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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United States
American Society for Investigative Pathology
01.03.2002
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Abstract | Most spontaneously developing hyperplastic and neoplastic lesions of the pituitary occur in the anterior pituitary. Targeted disruption of various cell-cycle proteins, including Rb, p27(kip1) (p27), and p18(INK4c) (p18), is associated with intermediate lobe pituitary hyperplasia. To develop a model of anterior pituitary proliferation to study the pathogenesis of pituitary tumors, we crossed the glycoprotein hormone alpha-subunit (alphaSU)-null mice that develop thyroid-stimulating hormone (TSH) cell hyperplasia with p18-null mice. The resulting offsprings developed accelerated enlargement of the anterior lobe with predominantly TSH cell hyperplasia. Immunohistochemical and histological analyses of these mice along with p27/p18 double-null mice, p18-null mice, and p27-null mice showed evidence of TSH, adrenocorticotropic hormone, prolactin, and luteinizing hormone hyperplasia. To determine whether there were alterations of p27 and the target proteins implicated in the ubiquitin degradation of p27 and other cyclin-dependent kinase inhibitors, we examined expression of SKP 2, Grb 2, and Jab 1 in the pituitaries of null mice. In the alphaSU-null mice there were decreased levels of SKP 2 and elevated levels of Grb 2 expression by Western blot analysis. Immunohistochemical analysis of the pituitary showed elevated Grb 2 in alphaSU-null and p18/alphaSU double-null mice. Jab 1 levels were not different from controls in the pituitary. These results show that 1) the p18/alphaSU double-null mice represent a good model to study the rapid development of anterior pituitary hyperplasia, and 2) various proteins important in p27 and other cyclin-dependent kinase inhibitor protein degradation are altered in the pituitary of alphaSU-null and p18/alphaSU double-null mouse models. |
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AbstractList | Most spontaneously developing hyperplastic and neoplastic lesions of the pituitary occur in the anterior pituitary. Targeted disruption of various cell-cycle proteins, including Rb, p27(kip1) (p27), and p18(INK4c) (p18), is associated with intermediate lobe pituitary hyperplasia. To develop a model of anterior pituitary proliferation to study the pathogenesis of pituitary tumors, we crossed the glycoprotein hormone alpha-subunit (alphaSU)-null mice that develop thyroid-stimulating hormone (TSH) cell hyperplasia with p18-null mice. The resulting offsprings developed accelerated enlargement of the anterior lobe with predominantly TSH cell hyperplasia. Immunohistochemical and histological analyses of these mice along with p27/p18 double-null mice, p18-null mice, and p27-null mice showed evidence of TSH, adrenocorticotropic hormone, prolactin, and luteinizing hormone hyperplasia. To determine whether there were alterations of p27 and the target proteins implicated in the ubiquitin degradation of p27 and other cyclin-dependent kinase inhibitors, we examined expression of SKP 2, Grb 2, and Jab 1 in the pituitaries of null mice. In the alphaSU-null mice there were decreased levels of SKP 2 and elevated levels of Grb 2 expression by Western blot analysis. Immunohistochemical analysis of the pituitary showed elevated Grb 2 in alphaSU-null and p18/alphaSU double-null mice. Jab 1 levels were not different from controls in the pituitary. These results show that 1) the p18/alphaSU double-null mice represent a good model to study the rapid development of anterior pituitary hyperplasia, and 2) various proteins important in p27 and other cyclin-dependent kinase inhibitor protein degradation are altered in the pituitary of alphaSU-null and p18/alphaSU double-null mouse models. |
Author | Ruebel, Katharina H Zhang, Shuya Jin, Long Lloyd, Ricardo V |
Author_xml | – sequence: 1 givenname: Ricardo V surname: Lloyd fullname: Lloyd, Ricardo V email: lloyd.ricardo@mayo.edu organization: Department of Laboratory Medicine and Pathology, MayoClinic, Rochester, Minnesota 55905, USA. lloyd.ricardo@mayo.edu – sequence: 2 givenname: Katharina H surname: Ruebel fullname: Ruebel, Katharina H – sequence: 3 givenname: Shuya surname: Zhang fullname: Zhang, Shuya – sequence: 4 givenname: Long surname: Jin fullname: Jin, Long |
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SubjectTerms | Animals Cell Cycle Proteins - genetics Cyclin-Dependent Kinase Inhibitor p18 Cyclin-Dependent Kinase Inhibitor p27 Disease Models, Animal Enzyme Inhibitors Gene Deletion Glycoprotein Hormones, alpha Subunit - genetics Hyperplasia Mice Mice, Inbred C57BL Pituitary Diseases - genetics Pituitary Diseases - pathology Pituitary Diseases - physiopathology Pituitary Gland - pathology Pituitary Gland - physiology Tumor Suppressor Proteins - genetics |
Title | Pituitary hyperplasia in glycoprotein hormone alpha subunit-, p18(INK4C)-, and p27(kip-1)-null mice: analysis of proteins influencing p27(kip-1) ubiquitin degradation |
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