876 Human urotensin II activates the sarcolemmal Na+/H+ exchanger: roles of protein kinase C and mitogen-activated protein kinase(s)

2003 ◽  
Vol 2 (1) ◽  
pp. 186
Author(s):  
K KATO ◽  
M YASUTAKE ◽  
D JIA ◽  
Y KUSAMA ◽  
T TAKANO
Keyword(s):  
Protein Kinase C ◽  
Protein Kinase ◽  
Mitogen Activated Protein Kinase ◽  
Urotensin Ii ◽  
Kinase C ◽  
Mitogen Activated Protein

TNF-α and interleukin 1 activate gastrin gene expression via MAPK- and PKC-dependent mechanisms

2001 ◽  
Vol 281 (6) ◽  
pp. G1405-G1412 ◽  
Author(s):  
T. Suzuki ◽  
E. Grand ◽  
C. Bowman ◽  
J. L. Merchant ◽  
A. Todisco ◽  
...  
Keyword(s):  
Gene Expression ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Kinase Inhibitor ◽  
Interleukin 1 ◽  
Mitogen Activated Protein Kinase ◽  
G Cells ◽  
Kinase C ◽  
Tnf Α ◽  
Mitogen Activated Protein

Helicobacter pyloriand proinflammatory cytokines have a direct stimulatory effect on gastrin release from isolated G cells, but little is known about the mechanism by which these factors regulate gastrin gene expression. We explored whether tumor necrosis factor (TNF)-α and interleukin (IL)-1 directly regulate gastrin gene expression and, if so, by what mechanism. TNF-α and IL-1 significantly increased gastrin mRNA in canine G cells to 181 ± 18% and 187 ± 28% of control, respectively, after 24 h of treatment. TNF-α and IL-1 stimulated gastrin promoter activity to a maximal level of 285 ± 12% and 415 ± 26% of control. PD-98059 (a mitogen-activated protein kinase kinase inhibitor), SB-202190 (a p38 kinase inhibitor), and GF-109203 (a protein kinase C inhibitor) inhibited the stimulatory action of both cytokines on the gastrin promoter. In conclusion, both cytokines can directly regulate gastrin gene expression via a mitogen-activated protein kinase- and protein kinase C-dependent mechanism. These data suggest that TNF-α and IL-1 may play a direct role in Helicobacter pylori-induced hypergastrinemia.

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