Phosphoprotein Enriched in Astrocytes (PEA15) is a 15kD-sized intracellular signaling protein, highly expressed in astrocytes and constitutively expressed in peripheral tissues. Recently it was found that PEA15 expression was elevated in patients suffering type 2 diabetes and suggested to be involved in the syndrome of insulin resistance. To investigate the functional role of PEA15 for the control of blood glucose level, we produced a transgenic pig over-expressing mouse PEA15 (mPEA15). As a model animal, pig has many advantages. They have a higher fecundity and a short generation time and are physiologically similar to human. Using the transgenic pig, we carried out a series of experiments to establish a link between PEA15 expression and the insulin resistance. Our results suggested that, compared with control pig, mPEA15 pig has, (1) a higher blood resistin level, (2) a lower cell membrane-embeded GLUT4 level, and (3) a lower glucose clearing ability based on oral glucose tolerance test (OGTT). When our results combined, it can be concluded that mPEA15 over-expressing pig has many symptoms of insulin resistance and these pigs will become a useful disease model to investigate diabetes mellitus in the near future.