U.S. stock index futures point lower on Japan By: Reuters: Company News April 12, 2011 at 05:14 AM EDT * U.S. stock index futures pointed to a lower open on Tuesday, with futures for the S&P 500 , Dow Jones and Nasdaq down 0.4 to 0.6 percent at 0903 GMT. Read More >> Related Stocks: Alcoa Amazon.com American International Group Bank of America Chevron Corp Hewlett-Packard Standard & Poors 500