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Differential expression of alpha 2 macroglobulin in response to dietylstilbestrol and in ovarian carcinomas in chickens

Cited 28 time in Web of Science Cited 32 time in Scopus
Authors
Lim, Whasun; Jeong, Wooyoung; Kim, Ji-Hye; Lee, Jin-Young; Kim, Jinyoung; Bazer, Fuller W.; Han, Jae Yong; Song, Gwonhwa
Issue Date
2011
Publisher
BioMed Central
Citation
Reproductive Biology and Endocrinology, 9:137
Keywords
chickenA2MDEScanceroviductovary
Description
This is an Open Access article distributed under the terms of the Creative Commons
Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: Alpha 2 macroglobulin (A2M; also known as ovostatin), a homotetrameric protein with four disulfidelinked subunits, has the unique feature of inactivating/inhibiting most known proteases including serine-, threonine-, cysteine-, aspartic- and metalloproteases. In chickens, A2M has been identified and characterized biochemically, but little is known of its functional role(s) in the oviduct, hormonal regulation of expression or its expression in ovarian carcinomas in chickens. Therefore, we investigated estrogen regulation of A2M gene expression during development of the chicken oviduct, and its expression in normal and cancerous ovaries from chickens.
Methods: To determine tissue-specific expression of A2M in chickens, we collected various organs from male and female chickens and performed RT-PCR analyses. To examine A2M gene expression in the oviduct of 1-week-old female chicks that received a subcutaneous implant of 15 mg DES in the abdominal region for 20 days, we performed RT-PCR, qPCR and in situ hybridization analyses using cDNAs from control- (n = 5) and DES-treated oviducts (n = 5), and then each segment of the oviduct from DES-treated chicks. To determine if A2M is a biomarker of ovarian cancer in hens, we collected cancerous (n = 10) ovaries from a total of 136 chickens which had completely stopped egg-laying and performed RT-PCR and in situ hybridization analyses.
Results: We found that A2M is most abundant in the chicken oviduct, specifically luminal (LE) and glandular epithelia (GE), but it was not detected in any other tissues of either sex. We then determined that DES (dietylstilbestrol, a synthetic nonsteroidal estrogen) increased A2M mRNA only in LE and GE of the oviduct of chicks. Further, expression of A2M was most abundant in GE of endometrioid adenocarcinoma of cancerous, but not normal ovaries of hens.
Conclusions: Collectively, results of the present study indicate that A2M is novel estrogen-stimulated gene expressed in LE and GE of the chicken oviduct and may be used for monitoring effects of therapies for ovarian cancer in laying hens.
ISSN
1477-7827
Language
English
URI
http://hdl.handle.net/10371/100309
DOI
https://doi.org/10.1186/1477-7827-9-137
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Food and Animal Biotechnology (식품·동물생명공학부)Journal Papers (저널논문_식품·동물생명공학부)
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