Inhibitors of Calcineurin Block Expression of Cyclins A and E Induced by Fibroblast Growth Factor in Swiss 3T3 Fibroblasts

1998 ◽  
Vol 353 (2) ◽  
pp. 374-378 ◽  
Author(s):  
Masahiro Tomono ◽  
Kotaro Toyoshima ◽  
Motohiro Ito ◽  
Hisao Amano ◽  
Zoltan Kiss

1986 ◽  
Vol 261 (3) ◽  
pp. 1187-1192
Author(s):  
K Kaibuchi ◽  
T Tsuda ◽  
A Kikuchi ◽  
T Tanimoto ◽  
T Yamashita ◽  
...  


1991 ◽  
Vol 1095 (2) ◽  
pp. 145-152 ◽  
Author(s):  
Thomas R. Davis ◽  
Louisa Tabatabai ◽  
Kerry Bruns ◽  
Richard T. Hamilton ◽  
Marit Nilsen-Hamilton




2012 ◽  
Vol 11 (12) ◽  
pp. 1690-1708 ◽  
Author(s):  
Kohji Nagano ◽  
Akunna Akpan ◽  
Gayathri Warnasuriya ◽  
Steven Corless ◽  
Nick Totty ◽  
...  


1996 ◽  
Vol 313 (1) ◽  
pp. 65-70 ◽  
Author(s):  
Andrew J. SAURIN ◽  
Jane HAMLETT ◽  
Michael J. CLAGUE ◽  
Stephen R. PENNINGTON

Quiescent cells (in G0) can be stimulated to enter the cell cycle and proceed to DNA synthesis in S-phase by a wide range of growth factors and mitogens. Activation of cell-surface growth factor receptors with intrinsic protein tyrosine kinase activity initiates autophosphorylation of the receptors and subsequent activation of signal transduction cascades. After activation the receptors undergo ligand-induced internalization to endosomes, which become acidified by the action of a vacuolar H+-ATPase (V-ATPase). The extent to which vesicular acidification plays a role in mitogenic signalling by receptors with intrinsic tyrosine kinase activity remains unknown. Here we have shown that bafilomycin A1, a specific inhibitor of V-ATPase, inhibits endosome acidification and mitogen-induced DNA synthesis in Swiss 3T3 fibroblasts. Addition of bafilomycin A1 at successively later times during G1 progressively decreased the inhibition of DNA synthesis such that no inhibition was observed when bafilomycin A1 was added at the onset of S-phase. Bafilomycin A1 also induced a dramatic but reversible change in the morphology of Swiss 3T3 cells. However, the rapid activation of c-fos mRNA accumulation by epidermal growth factor and insulin was unaffected by bafilomycin A1. Together, the results suggest that activation of the V-ATPase plays an important role in the mitogenic signalling pathways that occur during the G1 phase of the cell cycle but is not required for the initial epidermal growth factor and insulin-evoked signalling events that lead to c-fos mRNA expression.





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