Abstract:
:Exposure of isolated rat dispersed pancreatic acini to increasing concentrations (10 to 1000 ng/ml) of purified exotoxin-A from Pseudomonas aeruginosa resulted in a progressive inhibition of 3H-leucine incorporation into "cellular" (those remaining in the cells) and "secretory" (those released into the medium) proteins. With each concentration of exotoxin-A, magnitude of reduction was found to be greater for the "secretory" proteins than that observed for the "cellular" proteins. Thus, in the presence of 250 ng/ml of exotoxin-A, a dose that produced maximal inhibition in protein synthesis, 3H-leucine incorporation into "cellular" and "secretory" proteins was found to be decreased by about 19 and 50%, respectively, when compared with the corresponding basal controls. Release of trypsinogen, chymotrypsinogen and amylase from the isolated pancreatic acini was also inhibited by high doses of exotoxin-A. However, whereas the exotoxin concentration of 1000 ng/ml, caused a near complete inhibition of chymotrypsinogen release, trypsinogen and amylase secretion were decreased by 40 and 50%, respectively. It is concluded that in isolated pancreatic acini, exotoxin-A inhibits the synthesis and secretion of proteins.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Geokas MC,Vesenka GD,Dubick MA,Majumdar APdoi
10.1016/s0006-291x(85)80144-3subject
Has Abstractpub_date
1985-02-28 00:00:00pages
198-204issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(85)80144-3journal_volume
127pub_type
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