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Expression of the apoptosis-inducing ligands FasL and TRAIL in malignant and benign human breast tumors

Expression of the apoptosis-inducing ligands FasL and TRAIL in malignant and benign human breast... Apoptosis-inducing ligands such as Fas ligand (FasL) and tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) have been found to play an important role in cell regulation. Different malignant tumors show an altered expression of these ligands and their respective receptors compared to normal tissues. The purpose of this study was therefore to investigate expression of TRAIL, FasL, and its receptor Fas on protein and mRNA levels in breast carcinomas ( n =40), fibroadenomas ( n =7), and normal breast tissues ( n =5). Immunohistochemical reaction demonstrated that FasL was strongly expressed in breast cancer tissues (34/40) while only one fibroadenoma and one normal breast tissue reacted weakly positive for FasL. All fibroadenomas and normal breast tissues as well as the majority of breast cancer tissues expressed Fas on protein level. Quantitative RT-PCR analysis detected high expression of FasL mRNA in breast cancer tissues and fibroadenomas, whereas fibroadenomas showed the highest Fas mRNA copy numbers, followed by breast cancer tissues and normal breast tissues ( P <0.05). Compared to FasL expression, TRAIL could be detected in less breast cancer tissues on protein level (21/40) and was found in only one fibroadenoma and none of the normal breast tissues. Thus, it can be concluded that malignant breast tumors show an altered expression of the two apoptosis-inducing ligands FasL and TRAIL. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Histochemistry and Cell Biology Springer Journals

Expression of the apoptosis-inducing ligands FasL and TRAIL in malignant and benign human breast tumors

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References (21)

Publisher
Springer Journals
Copyright
Copyright © 2000 by Springer-Verlag Berlin Heidelberg
Subject
Legacy
ISSN
0948-6143
eISSN
1432-119X
DOI
10.1007/s004180050438
Publisher site
See Article on Publisher Site

Abstract

Apoptosis-inducing ligands such as Fas ligand (FasL) and tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) have been found to play an important role in cell regulation. Different malignant tumors show an altered expression of these ligands and their respective receptors compared to normal tissues. The purpose of this study was therefore to investigate expression of TRAIL, FasL, and its receptor Fas on protein and mRNA levels in breast carcinomas ( n =40), fibroadenomas ( n =7), and normal breast tissues ( n =5). Immunohistochemical reaction demonstrated that FasL was strongly expressed in breast cancer tissues (34/40) while only one fibroadenoma and one normal breast tissue reacted weakly positive for FasL. All fibroadenomas and normal breast tissues as well as the majority of breast cancer tissues expressed Fas on protein level. Quantitative RT-PCR analysis detected high expression of FasL mRNA in breast cancer tissues and fibroadenomas, whereas fibroadenomas showed the highest Fas mRNA copy numbers, followed by breast cancer tissues and normal breast tissues ( P <0.05). Compared to FasL expression, TRAIL could be detected in less breast cancer tissues on protein level (21/40) and was found in only one fibroadenoma and none of the normal breast tissues. Thus, it can be concluded that malignant breast tumors show an altered expression of the two apoptosis-inducing ligands FasL and TRAIL.

Journal

Histochemistry and Cell Biology – Springer Journals

Published: Mar 1, 2000

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