Visualization and Quantitation of Cyclooxygenase-1 and -2 Activity by Digital Fluorescence Microscopy.

  • Richard L. Ornberg
  • Alane T. Koki
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 469)


Cyclooxygenase (COX), also known as prostaglandin endoperoxide synthase, catalyzes the initial step in the conversion of arachidonic acid to prostaglandins and thromboxanes. Two distinct forms of the enzyme, COX-1 and COX-2 are known to be encoded by separate genes and are expressed in different normal and diseased tissues (Pairet and Engelhardt, 1996; Williams and DuBois, 1996). COX-1 is expressed in a wide variety of normal cells and tissues and produces prostaglandins that mediate homeostatic function. COX-2 is virtually undetectable under normal physiological conditions but is induced in a variety of cells at sites of inflammation (Masferrer, 1995), cancer (Koki, 1998), and in the central nervous system (Kaufman, 1996). Despite the similar catalytic activity and high amino acid sequence homology of the two isoforms, selective inhibitors have been synthesized for COX-2 and these are expected to provide a new therapy for arthritis and pain (Lipsky, 1998), inflammation (Masferrer 1995) and cancer (Kawamori T,, 1997)


Fluorescence Light Microscopy Exogenous Arachidonic Acid Similar Catalytic Activity High Amino Acid Sequence Homology Time Lapse Fluorescence Microscopy 
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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Richard L. Ornberg
    • 1
  • Alane T. Koki
    • 1
  1. 1.Analytical Sciences Center Science and Technology Monsanto CompanySt. LouisUSA

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