Nitric oxide in female reproductive system |
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Authors: | Xuan Zhang Cheng Zhu |
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Institution: | (1) State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | Nitric oxide (NO), synthesized from L-arginine and oxygen by a family of enzymes known as nitric oxide synthase (NOS), is an effective and intercellular signal transduction molecule, and is ubiquitously present in vertebrates. To date, there are three distinct isoforms of NOS: neural NOS (nNOS), inducible NOS (iNOS), and endothelial NOS (eNOS). Among them, eNOS and nNOS, also called constitutive isoforms (cNOS), require calcium for activity, and are expressed constitutively in the physiological condition. The third isoforms, iNOS, whose activity is not dependent on calcium, are produced only in response to some stimulus, including cytokines and immune stimulating factors, etc.1]. |
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