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Phospholipid metabolism of 3T3 mouse fibroblasts after serum stimulation and through the Gl and S cell cycle phases : incorporation and disappearance of P
Authors:C Dubois  C Rampini
Abstract:Phospholipid metabolism of 3T3 mouse fibroblasts has been studied after serum stimulation of arrested cells.The study of 32Pi]incorporation shows : a) in the case of PE and PC an early peak of incorporation in the Gl phase of the cell cycle, 6 hours after serum addition ; b) in the case of PI an intense initial increasing of the incorporation which continues up to a S phase peak.The study of the disappearance of 32P] Phosphate from the different phospholipids points out : a) at the beginning of serum stimulation, an intense breakdown of PI, that continues through the Gl and S phases. Except at the onset, the breakdown of PI, is at any time exactly compensated for by synthesis : the two phenomena are closely linked ; b) a synthesis of PE, from PC probably, at the Gl phase, 4 hours after the serum addition and the beginning of the chase experiment.
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