Design and Evaluation of Inhibitors of Phospholipases A2 as Anti-Inflammatory Drugs

Funded Activity Summary

There are at least 16 types of enzymes called phospholipases A2 (PLA2). They are found in venoms of snakes, bees, lizards, cone snails, etc and act as toxic and digestive agents. PLA2 enzymes are also found in cells and tissues of mammals where they carry out a wide range of digestive, maintenance, immune defence, and cell signalling functions. The human pancreas secretes one form of PLA2 into the gut to aid digestion. Human immune cells (macrophages, thymocytes, spleen leukocytes, platelets) use other forms of PLA2 in the inflammatory immune response to kill infectious foreign agents like viruses and bacteria. One form of PLA2, known as type IIa, is the main bacteria-killing ingredient of human tears and it is also a chief component of fluid from the joints of patients with arthritis. Type IIa PLA2 is present in abnormally high levels in blood from humans with arthritis, burns, sepsis, ARDS, atherosclerosis, Crohn's disease, malaria, cancer and other chronic illnesses. These high levels can cause injury, tissue damage and pain due to too much inflammation and treatments are needed to stop or decrease effects of this enzyme . For these reasons this and related enzymes are thought to be potential targets for drugs which would act by blocking the functions of such an enzyme. Our group has been using computers to design new chemicals that can selectively fit into this enzyme and stick very tightly. We are determining the three dimensional structures of these chemicals in the enzyme to learn how to make them bind even more tightly. This information is allowing us to synthesize new selective drugs that stop PLA2 from promoting the development of disease. We propose to continue these studies towards developing powerful new antiinflammatory drugs that block the enzyme, and to demonstrate possible benefits of these drugs by testing them in animal models of arthritis, sepsis, adult respiratory distress syndrome (ARDS), period pain, malaria, and cancer.

Funded Activity Details

Start Date: 01-01-2001

End Date: 01-01-2003

Funding Scheme: NHMRC Project Grants

Funding Amount: $317,545.00

Funder: National Health and Medical Research Council

Research Topics

ANZSRC Field of Research (FoR)

Medical biochemistry and metabolomics not elsewhere classified

ANZSRC Socio-Economic Objective (SEO)

There are no SEO codes available for this funding activity

Other Keywords

anti-inflammatory | arthritis | design | drug | enzyme | inflammation | inhibitor | protease | structure

Related Links