The estate of Lehman Brothers Holdings Inc. claims that JPMorgan Chase & Co. helped drive Lehman into bankruptcy by forcing it to give up billions of dollars in cash reserves that it otherwise could have used to stay afloat.

The Lehman estate alleges in a lawsuit filed Wednesday in Southern District Bankruptcy Court that JPMorgan forced the now-failed bank to put up collateral that sapped Lehman of cash that, at the least, would have enabled it to wind down operations in an orderly process.