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The developmental gene expression of pancreatic lipase (PL) and its related proteins (PLRP1 and PLRP2) is anticoordinate. It is unknown whether dietary fat regulates the expression of these proteins in the preweanling stage. For determining the regulation of development and diet on PL, PLRP1, and PLRP2 as early as the suckling period, pregnant (Sprague-Dawley) rats consumed from day 15 (d15) of pregnancy through d9 of lactation a purified low (11% of energy) safflower oil diet [low-fat (LF)]. From d9 of lactation, dams and their respective pups were fed LF, medium-fat (MF; 40% of energy), or high-fat (HF; 67% of energy) safflower oil diets to d56. Milk fatty acid content had 15- to 100-fold less C:10 and 2.6- to 3.3-fold more C18:2 in MF and HF groups. Diet (LF &lt; MF = HF; P &lt; 0.002), postnatal development (d15 &lt; d21 &lt; d28 = d56; P &lt; 0.001), and interaction of diet x development significantly affected PL activity starting as early as d15. PL mRNA levels showed a parallel effect of diet (LF &lt; HF = MF; P &lt; 0.013) and development (P &lt; 0.001). Both PLRP1 and PLRP2 mRNA levels were significantly affected by development (P &lt; 0.001) and had an anticoordinate pattern compared with PL expression (d15 &gt; d21 &gt; d28). Reported for the first time is the significant down-regulation of PLRP2 mRNA levels by high polyunsaturated fat in suckling (d15) rats. In conclusion, PL and PLRP2 gene expression is regulated anticoordinately by the amount of dietary polyunsaturated fat starting as early as the preweanling phase of development.

Pancreatic Lipase and Its Related Protein 2 Are Regulated by Dietary Polyunsaturated Fat during the Postnatal Development of Rats