Diethylstilbestrol regulates expression of avian apolipoprotein D during regression and recrudescence of the oviduct and epithelial-derived ovarian carcinogenesis.
Apolipoprotein D (APOD) is a glycoprotein which is widely expressed in mammalian tissues. It is structurally and functionally similar to the lipocalins which are multiple lipid-binding proteins that transport hydrophobic ligands and other small hydrophobic molecules, including cholesterol and several steroid hormones. Although multiple functions for APOD in various tissues have been reported, its expression, biological function, and hormonal regulation in the female reproductive system are not known. Thus, in this study, we focused on correlations between APOD and estrogen during development, differentiation, regression, and regeneration of the oviduct in chickens and in the development of ovarian carcinogenesis in laying hens. Results of the present study indicated that APOD messenger RNA (mRNA) expression increased (P < 0.001) in the luminal and glandular (GE) epithelia of the chicken oviduct in response to diethylstilbestrol (a nonsteroidal synthetic estrogen). In addition, the expression of APOD mRNA and protein decreased (P < 0.001) as the oviduct regressed during induced molting, and gradually increased (P < 0.001) with abundant expression in GE of the oviduct during recrudescence after molting. Furthermore, APOD mRNA and protein were predominantly localized in GE of cancerous, but not normal ovaries from laying hens. Collectively, results of the present study suggest that APOD is a novel estrogen-stimulated gene in the chicken oviduct which likely regulates growth, differentiation, and remodeling of the oviduct during oviposition cycles. Moreover, up-regulated expression of APOD in epithelial cell-derived ovarian cancerous tissue suggests that it could be a candidate biomarker for early detection and treatment of ovarian cancer in laying hens and in women.
Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea.
J
J
Jeong
Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea.
H
H
Bae
Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea.
W
W
Lim
Department of Animal Science, Center for Animal Biotechnology and Genomics, Texas A&M University, College Station, TX, USA.
F W
FW
Bazer
Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea. Electronic address: ghsong@korea.ac.kr.
G
G
Song
D000818:Animals; D053399:Apolipoproteins D / Q000032:analysis / Q000235:genetics* / Q000502:physiology; D002645:Chickens; D004054:Diethylstilbestrol / Q000494:pharmacology*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D018978:Molting / Q000502:physiology; D010051:Ovarian Neoplasms / Q000378:metabolism / Q000503:physiopathology / Q000662:veterinary*; D010053:Ovary / Q000737:chemistry; D010057:Oviducts / Q000737:chemistry / Q000254:growth & development / Q000503:physiopathology*; D010058:Oviposition / Q000502:physiology; D011201:Poultry Diseases / Q000503:physiopathology*; D012333:RNA, Messenger / Q000032:analysis
D053399:Apolipoproteins D; D012333:RNA, Messenger; D004054:Diethylstilbestrol
APOD; Chicken; Estrogen; Ovarian cancer; Oviduct