The assessment of HER2 phosphorylation by FRET showed that HER2 activation increased from basal levels during the first 2.5 days of combined Iressa and Herceptin (Figure 4B).
As illustrated in Figure 2(A), the rate of H2O2 production was decreased linearly as mitochondrial respiration increased from basal to 270 nmol O2·min−1·mg protein−1, and thereafter showed no significant decrease as respiration was increased from 270 to 380 nmol O2·min−1·mg prO2·min−1·mg
The mean time taken to increase from basal to peak [Ca2+]i levels of the AVP response was approx. 3-fold longer in NG-cultured cells compared with HG-cultured cells.
The epithelial proliferation of normal human breast tissue xenografts implanted into athymic nude mice is significantly increased from basal levels by oestradiol (E2), but not progesterone (Pg) treatment at serum concentrations similar to those observed in the luteal phase of the human menstrual cycle.
The fluid pressure showed an increasing pattern from basal to apical or with an increasing depth of insertion.
These processes generate bistability: the cytosolic calcium concentration abruptly increases from a basal level to a stimulated level at a threshold degree of activation of phospholipase C. Spiking further requires slow deactivation and subsequent reactivation.
Thus, the mean ± standard deviation rate of insulin secretion increased from a basal rate of 0.165 ± 0.059 ng/10 islets/min to a stimulated rate of 0.422 ± 0.095 ng/10 islets/min (P <.05, n = 3), when the glucose concentration was changed from 5.5 mmol/L to 27.5 mmol/L, and this glucose stimulation index was not different from that observed with unencapsulated islets under same conditions.
If the concentration of the HOG1 GFP reporter protein is increased from its basal level (in cells that presumably contain only a single copy of the expression plasmid) to more than four to fivefold higher, the signal transduction system seems oversaturated with HOG1, and a response to both stimuli is no longer visible.
In order to simulate the effect of elevated CLV3 levels, the differentiation parameter λ3 was increased from its basal level.
What clearly emerges from our studies is that inhibition of kinases reduces phosphorylation with proportional changes in transport, and that transport stimulation is only seen when phosphorylation increases from its basal level.
