The localization of SMAD2 to alveolar and airway tissue and the decreased TGFβ pathway activity seen with increasing emphysema severity support the hypothesis that a decrease in TGFβ pathway activity also contributes to emphysema pathogenesis.
We argued that this may be true for HDACi treated PCa cells, where there is a decrease in BRCA1 pathway related gene expression.
Treatment of both with the ErbB2-specific antibody trastuzu-mab caused a cell cycle block that was accompanied by a decrease in PI3K/Akt pathway activity, and by downregulation of Myc and D-type cyclins [ 55].
Although most mutants affecting cilial morphology or function lead to a decrease in Shh pathway function, such as seen in the IFT52, IFT57, IFT88/polaris, IFT172 and Kif3a mutants (66– 69, 72, 73), at least one mutant that affects retrograde intraflagellar transport results in activation of the Shh pathway (42).
A decrease in lipogenesis pathways accompanies the increased fatty acid catabolism pathways caused by rosiglitazone in mature adipocytes, as shown by decreased expression of genes encoding triacylglycerol synthesis enzymes and the genes encoding lipase.
Accordingly, western blotting revealed that PPAR γ1 or PPAR γ2 expression resulted in a decrease in lipogenic pathways (Akt, mTOR, Fasn, Acc) and oxidative stress (Cox-2).
Furthermore, gene expression profiling of arginine butyrate-treated skeletal muscle indicated an increase in growth-promoting pathways (e.g., the IGF-1 pathway) and a decrease in pro-fibrotic pathways.
These results agree with previous observations indicating that tellurite also causes a rapid reduction of ATP levels that does not involve a decrease in the glycolytic pathway or depletion of glucose in E. coli [32].
Our starting hypothesis was that adaptation to high pH stress should entail a decrease in the PKA pathway activity.
Furthermore, knockdown of RBPj κ resulted in a decrease in the notch pathway evidenced by a decrease in cleaved Notch1 and Hes-1.
