Abstract |
Various biological effects induced by the tumor promoting phorbol ester TPA in mouse skin are comparably suppressed by the immunologically inactive cyclosporine H (CsH) and by the strongly immunosuppressive cyclosporine A (CsA). These effects inhibited include the development of edema, stimulation of alkaline phosphatase activity, DNA and protein synthesis, as well as tumor promotion. Furthermore, CsH, like CsA, inhibits the Ca2+/ calmodulin-dependent phosphorylation of the elongation factor 2 (EF-2) in vitro and the TPA-induced increases in the amount of EF-2 in vivo. Similar observations were made using the weak immunosuppressant CsD. We conclude from these results that the ability of cyclosporines to act as immunosuppressants and their ability to inhibit TPA-effects are based on two different mechanisms of action. Inhibition of TPA-effects may involve suppression of calmodulin-dependent processes, such as augmentation and phosphorylation of EF-2.
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Authors | M Gschwendt, W Kittstein, F Marks |
Journal | Biochemical and biophysical research communications
(Biochem Biophys Res Commun)
Vol. 150
Issue 2
Pg. 545-51
(Jan 29 1988)
ISSN: 0006-291X [Print] United States |
PMID | 3342035
(Publication Type: Comparative Study, Journal Article)
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Chemical References |
- Cyclosporins
- Peptide Elongation Factor 2
- Peptide Elongation Factors
- Cyclosporine
- cyclosporin D
- Protein Kinases
- Alkaline Phosphatase
- cyclosporin H
- Tetradecanoylphorbol Acetate
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Topics |
- Alkaline Phosphatase
(metabolism)
- Animals
- Cyclosporine
- Cyclosporins
(pharmacology)
- Cytosol
(metabolism)
- DNA Replication
(drug effects)
- Mice
- Peptide Elongation Factor 2
- Peptide Elongation Factors
(metabolism)
- Phosphorylation
- Protein Biosynthesis
- Protein Kinases
(metabolism)
- Skin
(drug effects, metabolism)
- Structure-Activity Relationship
- Tetradecanoylphorbol Acetate
(pharmacology)
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