Dragged down by losses for shares of American Express and Nike, the Dow Jones Industrial Average is trading down Wednesday afternoon. Shares of American Express AXP and Nike NKE are contributing to the blue-chip gauge’s intraday decline, as the Dow DJIA was most recently trading 173 points lower (-0.5%). American Express’s shares are down $3.46, or 2.3%, while those of Nike are off $2.06 (1.7%), combining for a roughly 36-point drag on the Dow. Chevron CVX, Walt Disney DIS, and Goldman Sachs GS are also contributing significantly to the decline. A $1 move in any one of the 30 components of the Dow results in a 6.59-point…