RPT-US STOCKS-Wall Street sheds gains as oil slide weighs
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* ECB cuts key rates, expands asset-buying plan
* Dollar General up after results
* Crude oil down about 2 pct
* Indexes down: Dow 0.31 pct, S&P 0.17 pct, Nasdaq 0.32 pct
By Abhiram Nandakumar
March 10 (Reuters) - Wall Street retreated sharply in volatile trading on Thursday as a slide in oil prices undermined gains from the European Central Bank's move to cut rates and expand its stimulus program.
The ECB pushed deposit rate deeper into negative territory and increased its asset-buying program to 80 billion euros a month from 60 billion euros in an effort to boost growth in the region.
"Europe continues to be stimulative...(but) there's only so much this can continue to help the markets," said Philip Blancato, chief executive of New York-based Ladenberg Thalmann Asset Management. Continuación...