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Figure 5 SH2-domain containing tyrosine phosphatase-1 (SHP-1) down-regulates reduced nicotinamide adenine dinucleotide (phosphate) (NAD[P]H)-oxidase activity. (A) Specific inhibitory peptides against NAD(P)H-oxidase (gp91ds-tat, 100 µmol/l) abrogated the increase in O2·– release in human umbilical vein endothelial cell (HUVEC) monolayers that was caused by sodium stibogluconate (SS). (B) NADH-dependent O2·– production in HUVEC protein lysates was increased 3.3-fold after treatment of cells with antisense oligodesoxynucleotide (AS-ODN) against SHP-1 but not with random ODN. *, **Significantly different vs. control at p < 0.05 and p < 0.01, respectively; ##significantly different vs. SS at p < 0.01.
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