Abstract
Isolated rat enterocytes were incubated with E. coli heat-stable enterotoxin or buffer alone and the protein kinase activity and cyclic GMP level determined on the particulate fraction or cytosol, respectively. In the control cells, particulate protein kinase activity and cyclic GMP concentration were at a maximum after 20 sec and 1 min of incubation, respectively. In heat-stable enterotoxin-treated cells the particulate protein kinase activity was significantly increased (P < 0.05) after 20 sec of incubation, but decreased (P < 0.05) after 30 sec, 1 min and 2 min, when compared to the control reaction. During this time period the concentration of intracellular cyclic GMP increased 10-fold. The effect of heat-stable enterotoxin on particulate protein kinase activity and cyclic GMP concentration was dose-dependent. Analysis of radioactive membrane phosphorylation products indicate a role for phosphoproteins with a mol. wt of 25,000 and 120,000. These results suggest that the action of heat-stable enterotoxin may involve an effect on protein kinase.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 493-500 |
| Number of pages | 8 |
| Journal | Toxicon |
| Volume | 28 |
| Issue number | 5 |
| DOIs | |
| State | Published - Jan 1 1990 |
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All Science Journal Classification (ASJC) codes
- Toxicology
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The effect of Escherichia coli heat-stable enterotoxin on protein kinase activity. / Knoop, Floyd C.; Martig, Robert J.; Boehm, William J.
In: Toxicon, Vol. 28, No. 5, 01.01.1990, p. 493-500.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The effect of Escherichia coli heat-stable enterotoxin on protein kinase activity
AU - Knoop, Floyd C.
AU - Martig, Robert J.
AU - Boehm, William J.
PY - 1990/1/1
Y1 - 1990/1/1
N2 - Isolated rat enterocytes were incubated with E. coli heat-stable enterotoxin or buffer alone and the protein kinase activity and cyclic GMP level determined on the particulate fraction or cytosol, respectively. In the control cells, particulate protein kinase activity and cyclic GMP concentration were at a maximum after 20 sec and 1 min of incubation, respectively. In heat-stable enterotoxin-treated cells the particulate protein kinase activity was significantly increased (P < 0.05) after 20 sec of incubation, but decreased (P < 0.05) after 30 sec, 1 min and 2 min, when compared to the control reaction. During this time period the concentration of intracellular cyclic GMP increased 10-fold. The effect of heat-stable enterotoxin on particulate protein kinase activity and cyclic GMP concentration was dose-dependent. Analysis of radioactive membrane phosphorylation products indicate a role for phosphoproteins with a mol. wt of 25,000 and 120,000. These results suggest that the action of heat-stable enterotoxin may involve an effect on protein kinase.
AB - Isolated rat enterocytes were incubated with E. coli heat-stable enterotoxin or buffer alone and the protein kinase activity and cyclic GMP level determined on the particulate fraction or cytosol, respectively. In the control cells, particulate protein kinase activity and cyclic GMP concentration were at a maximum after 20 sec and 1 min of incubation, respectively. In heat-stable enterotoxin-treated cells the particulate protein kinase activity was significantly increased (P < 0.05) after 20 sec of incubation, but decreased (P < 0.05) after 30 sec, 1 min and 2 min, when compared to the control reaction. During this time period the concentration of intracellular cyclic GMP increased 10-fold. The effect of heat-stable enterotoxin on particulate protein kinase activity and cyclic GMP concentration was dose-dependent. Analysis of radioactive membrane phosphorylation products indicate a role for phosphoproteins with a mol. wt of 25,000 and 120,000. These results suggest that the action of heat-stable enterotoxin may involve an effect on protein kinase.
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U2 - 10.1016/0041-0101(90)90293-G
DO - 10.1016/0041-0101(90)90293-G
M3 - Article
VL - 28
SP - 493
EP - 500
JO - Toxicon
JF - Toxicon
SN - 0041-0101
IS - 5
ER -