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Requirement of Phospholipase D1 Activity in H- RasV12-Induced Transformation
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Requirement of Phospholipase D1 Activity in H- RasV12-Induced Transformation
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Journal Article
Requirement of Phospholipase D1 Activity in H- RasV12-Induced Transformation
2005
Overview
The ability of the Ras oncogene to transform normal cells has been well established. One downstream effector of Ras is the lipid hydrolyzing enzyme phospholipase D. Recent evidence has emerged indicating a role for phospholipase D in cell proliferation, membrane trafficking, and migration. To study the potential importance of phospholipase D in the oncogenic ability of Ras, we used Rat-2 fibroblasts with reduced phospholipase D1 activity (Rat-2V25). Here, we show that H-Ras transformation of Rat-2 fibroblasts requires normal phospholipase D1 activity. WT Rat-2 fibroblasts transfected with the H- RasV12oncogene grew colonies in soft agar and tumors in nude mice. However, Rat-2V25 cells when transfected with the H- RasV12oncogene did not form colonies in soft agar or produce tumors when xenografted onto nude mice. Interestingly, in the presence of phosphatidic acid, the product of phospholipase D, growth in soft agar and tumor formation was restored. We also observed a dramatic increase in the expression of phospholipase D1 in colorectal tumors when compared with adjacent normal mucosa. Our studies identify phospholipase D1 as a critical downstream mediator of H-Ras-induced tumor formation.
Publisher
National Academy of Sciences,National Acad Sciences
Subject
/ Cell Transformation, Neoplastic
/ Colorectal Neoplasms - enzymology
/ Colorectal Neoplasms - genetics
/ Colorectal Neoplasms - pathology
/ Colorectal Neoplasms - surgery
/ Enzymes
/ Heterologous transplantation
/ Humans
/ Intestinal Mucosa - enzymology
/ Lipids
/ Mice
/ Mucosa
/ Phospholipase D - metabolism
/ Rats
/ Tumors
