European shares nudged up on Thursday after the US Federal Reserve lowered borrowing costs for the first time since December, while shares of SIG plummeted after the Swiss-based company issued a profit warning. The pan-European STOXX 600 rose 0.5% to 553.49 points, in broad-based gains.In Denmark, Novo Nordisk rose 2.6%.SIG Group slid 20%.Britain's Next also lost 5.5%.