Pt. Kortesuo et al., RAT PANCREATIC PHOSPHOLIPASE-A2 - PURIFICATION, LOCALIZATION, AND DEVELOPMENT OF AN ENZYME-IMMUNOASSAY, International journal of pancreatology, 13(2), 1993, pp. 111-118
Phospholipase A2 (PLA2, E.C. 3.1.1.4) was purified from rat pancreatic
tissue by heat treatment of the homogenate and use of cation-exchange
chromatography on a CM-Sepharose column. The enzyme was apparently ho
mogenous on SDS polyacrylamide gel electrophoresis, and its mol wt was
estimated to be 14,400. An antiserum raised against rat pancreatic PL
A2 in a rabbit was used in a solid-phase enzyme immunoassay employing
inorganic pyrophosphatase (E.C. 3.6.1.1) as the enzyme label. As measu
red by this assay, the concentration of pancreatic PLA2 in plasma was
found to be above normal in rats with hemorrhagic pancreatitis induced
by an intraductal injection of sodium taurocholate. PLA2 was localize
d in pancreatic acinar cells and in the chief cells in the mucosa of t
he glandular stomach by immunohistochemistry. By immunoelectron micros
copy, the immunogold conjugates were mainly located on profiles of zym
ogen granules in acinar cells.