[The effect of db-cAMP on the gene expression of calmodulin and cytoskeleton in the transformed cells].
We have demonstrated that the distribution of microtubules (MT), microfilaments (MF) and fibronectin (FN) were diminished, while the gene expression of the calmodulin and c-fos enhanced in the transformed C3 H10 T1/2 cells. After treatment with 1 mM db-cAMP for 1 hr. and 2 hrs., there was an early and rapidly reduced in gene expression of calmodulin and c-fos respectively. After db-cAMP treatment for 4-5 days, the number of Capping cells of ConA binding decreased significantly and the cell surface microvilli decreased also. The growth of treated cells was inhibited markedly. By using 4F1 cDNA probe, which is preferentially expressed in G1 phase, we have found that the db-cAMP treated cells were accumulated at G1 phase. Of particular interest is the fact that the distribution of microtubules, microfilaments and fibronectin were recovered after treatment with 1 mM db-cAMP for 6 days. It is suggested that the inhibition of proliferation, alteration of phenotype and recovery of cytoskeleton in transformed cells after treatment with db-cAMP are related to the inhibition of gene expression of calmodulin.
Liu
H T
HT
Department of Biology, Beijing Normal University, China.
Wang
D S
DS
Zhang
H Q
HQ
Xue
S B
SB
You
J S
JS
Du
C Y
CY
Wang
X L
XL
D000818:Animals; D003994:Bucladesine / Q000494:pharmacology*; D002147:Calmodulin / Q000235:genetics*; D002461:Cell Line, Transformed; D003599:Cytoskeleton / Q000187:drug effects*; D005347:Fibroblasts; D015870:Gene Expression / Q000187:drug effects; D051379:Mice
D002147:Calmodulin; D003994:Bucladesine