Aug 25 (Reuters) - The Nasdaq opened at a record high on Wednesday, lifted by gains in technology-related stocks, while broader markets remained subdued ahead of a U.S. monetary policy update this week. The Dow Jones Industrial Average rose 22.5 points, or 0.06%, at the open to 35388.77. The S&P 500 rose 4.2 points, or 0.09%, to 4490.45, while the Nasdaq Composite rose 19.2 points, or 0.13%, to 15039.027 at the opening bell. (Reporting by Devik Jain in Bengaluru; Editing by Saumyadeb Chakrabarty) Our Standards: The Thomson Reuters Trust Principles.