Unfolding protein response signaling is involved in development,maintenance, and regression of the corpus luteum during the bovine estrous cycle |
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Authors: | Hyo-Jin Park Sun-Ji Park Deog-Bon Koo Il-Keun Kong Min Kyu Kim Jin-Man Kim Myung-Sook Choi Young-Ho Park Sun-Uk Kim Kyu-Tae Chang Choon-Keun Park Jung-Il Chae Dong-Seok Lee |
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Institution: | 1. School of Life Science and Biotechnology (BK 21 plus program), Kyungpook National University, Daegu 702-701, Republic of Korea;2. Department of Biotechnology, Daegu University, Gyeongbuk 712-749, Republic of Korea;3. Department of Animal Science, Gyeongsang National University, Jinju 660-701, Republic of Korea;4. Department of Animal Science and Biotechnology, Chungnam National University, Daejeon 305-764, Republic of Korea;5. Department of Pathology, School of Medicine, Chungnam National University, Daejeon 305-732, Republic of Korea;6. Department of Food Science and Nutrition, Kyungpook National University, Daegu 702-701, Republic of Korea;g Center for Food and Nutritional Genomics Research, Kyungpook National University, Daegu 702-701, Republic of Korea;h Disease Model Research Laboratory, Aging Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea;i National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea;j College of Animal Life Science, Kangwon National University, Chuncheon 200-701, Republic of Korea;k Department of Oral Pharmacology, Chonbuk National University, Jeonju 651-756, Republic of Korea |
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Abstract: | The corpus luteum (CL) is a transient endocrine organ. Development, maintenance, and regression of CL are effectively controlled by dynamic changes in gene expression. However, it is unknown what types of gene are affected during the CL life span of the estrous cycle in bovine. Here, we determined whether unfolded protein response (UPR) signaling via eIF2α/ATF4/GADD34, p90ATF6/p50ATF6, and IRE1/XBP1, which is a cellular stress response associated with the endoplasmic reticulum (ER), is involved in the bovine CL life span. Our results indicated that expression of Grp78/Bip, the master UPR regulator, was increased during the maintenance stage and rapidly decreased at the regression stage. Additionally, UPR signaling pathways genes were found to be involved in luteal phase progression during the estrous cycle. Our findings suggested that Grp78/Bip, ATF6, and XBP1 act as ER chaperones for initiating CL development and maintaining the CL. In addition, we investigated whether ER stress-mediated apoptosis is occurred through three UPR signaling pathways in CL regression stage. Interestingly, pIRE1 and CHOP were found to be involved in both the adaptive response and ER stress-mediated apoptosis. During the CL regression stage, increased expression of pJNK and CHOP, two components of ER stress-mediated apoptotic cascades, occurred before increased level of cleaved caspase 3 were observed. The present investigation was performed to identify a functional link between UPR signaling and CL life span during the bovine estrous cycle. Taken together, results from this study demonstrated that UPR protein/gene expression levels were different at various stages of the bovine CL life span. Variations in the expression of these protein/genes may play important roles in luteal stage progression during the estrous cycle. |
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Keywords: | Corpus luteum Estrous cycle ER stress Unfolding protein response Steroidogenic enzymes Progesterone |
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