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Inducible Nitric Oxide Synthase Expression and Luteal Cell DNA Fragmentation of Porcine Cyclic Corpora Lutea

  • Tao, Yong (Department of Animal Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Fu, Zhuo (Department of Animal Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Xia, Guoliang (Department of Animal Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Lei, Lei (Department of Animal Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Chen, Xiufen (Department of Animal Physiology and Biochemistry, College of Biological Sciences, China Agricultural University) ;
  • Yang, Jie (Department of Animal Physiology and Biochemistry, College of Biological Sciences, China Agricultural University)
  • Received : 2004.05.05
  • Accepted : 2004.11.19
  • Published : 2005.05.01

Abstract

Nitric oxide (NO) derived from inducible nitric oxide synthase (iNOS) is involved in cell apoptosis, which contributes to luteal regression and luteolysis in some species. In large domestic animals, no direct evidence for the relationship between NO and cell apoptosis in the process of corpus luteum regression is reported. The present study was conducted to investigate the localization of iNOS on porcine corpora lutea (CL) during the oestrus cycle and its relation to cell DNA fragmentation and CL regression. According to morphology, four luteal phases throughout the estrous cycle were defined as CL1, CL2, CL3 and CL4. By isoform-specific antibody against iNOS, the immunochemial staining was determined. Luteal cell DNA fragmentation was determined by flow cytometry. The results showed that no positive staining for iNOS was in CL1 and that iNOS was produced but limited to the periphery of CL2, while in the CL3, the spreading immunochemical staining was found inside the CL. No iNOS positive staining was detected in CL4. Meanwhile, DNA fragmentation increased dramatically when CL developed from CL2 to CL3 (p<0.05). In CL4, higher proportion of luteal cells still had fragmented DNA than that of luteal cells from CL1 or CL2 (p<0.05). These results indicate that iNOS expression is closely related to luteal cell apoptosis and then to luteal regression.

Keywords

Nitric Oxide Synthase;Corpora Lutea;Apoptosis;Estrous Cycle

Acknowledgement

Supported by : National Outstanding Youth Foundation of China, Beijing Natural Science Foundation

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