Reduced levels of E-cadherin correlate with progression of corticotroph pituitary tumours.

Abstract:

OBJECTIVES:Loss of E-cadherin is an important marker of epithelial tumour progression. The aims of this study were to explore whether E-cadherin expression and localization correlate to corticotroph tumour progression, relate the expression of the E-cadherin gene (CDH1) to immunohistochemical E-cadherin staining pattern, and study whether the E-cadherin levels were correlated to methylation status of the CDH1 promoter region. DESIGN:Immunohistochemical analyses of E-cadherin protein were performed, as was RT-qPCR of the CDH1 and the POMC genes. Methylation pattern of the promoter region of CDH1 was measured using pyrosequencing of bisulfite-treated DNA. PATIENTS:Forty-five patients operated at a tertiary referral centre in Oslo, Norway. Adenoma tissue sections and RNA samples from patients with verified Cushing's disease or Nelson's syndrome were collected. MEASUREMENTS:Expression of E-cadherin mRNA and protein in pituitary corticotroph adenomas and average percentage of methylated cytosines in a cytosine-phosphate-guanosine island of the CDH1 promoter. RESULTS:Correlations were observed between tumour progression and both nuclear expression of E-cadherin and reduced CDH1 mRNA. The E-cadherin expression was not determined by the methylation pattern of the CDH1 promoter. CONCLUSIONS:Corticotroph tumour progression was associated with reduced expression of the epithelial marker E-cadherin.

journal_name

Clin Endocrinol (Oxf)

journal_title

Clinical endocrinology

authors

Evang JA,Berg JP,Casar-Borota O,Lekva T,Kringen MK,Ramm-Pettersen J,Bollerslev J

doi

10.1111/j.1365-2265.2011.04109.x

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

811-8

issue

6

eissn

0300-0664

issn

1365-2265

journal_volume

75

pub_type

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