Expression of AGR-2 in chicken oviduct during laying period.
The chicken oviduct is a dynamic organ that produces secretory proteins such as ovalbumin during the laying period. In this study, we identified oviduct-specific proteins in hens during the egg-laying period by proteomic analysis. Proteins extracted from the magnum of hens of different ages (5, 35, and 65 weeks) were analyzed by two-dimensional gel electrophoresis to compare the intensity of proteins among samples. Approximately 300 spots were detected on each gel. Based on the comparison of image gels, we found that the intensity of eight spots in 35-week magnums was increased at least by 2-fold compared with the others. Five of the eight spots were identified as calumenin, acidic ribosomal phosphoproteins (ARP), prohibitin, heart fatty acid-binding protein, and anterior gradient-2 (AGR-2). In particular, ARP and AGR-2 were highly expressed in 35- week magnums compared with 5- and 65-week magnums. In addition, the level of these proteins was consistent with their RNA levels. Expression of AGR-2 mRNA was detected in the mature magnum, whereas no signal was observed in premature tissue. Among various tissues, expression of AGR-2 mRNA was highest in the magnum, high in the isthmus, and five fold lower in muscle. It was undetectable in the liver and in other tissues (heart and kidney). However, the mRNA levels of other proteins were ubiquitous among tissues. In transcriptional activity of AGR-2, a 3.0 kb fragment of promoter region containing potential estrogen receptor binding sites had enhanced its activity strongly. In conclusion, these results suggest that AGR-2 has functional regulatory roles in the chicken oviduct during the egglaying period.
Kim
Nam Soo
NS
Department of Biology, Kyung Hee University, Seoul 130-701, Republic of Korea.
Shen
Yan Nan
YN
Kim
Tae-Yoon
TY
Byun
Sung June
SJ
Jeon
Ik Soo
IS
Kim
Sang Hoon
SH
D000818:Animals; D030161:Avian Proteins / Q000235:genetics* / Q000378:metabolism*; D002645:Chickens / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D004967:Estrogens / Q000494:pharmacology; D005260:Female; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000187:drug effects; D006367:HeLa Cells; D006801:Humans; D010057:Oviducts / Q000187:drug effects / Q000378:metabolism*; D010058:Oviposition / Q000187:drug effects / Q000502:physiology*; D011401:Promoter Regions, Genetic / Q000187:drug effects / Q000235:genetics; D040901:Proteomics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
D030161:Avian Proteins; D004967:Estrogens; D012333:RNA, Messenger