Reduced Reproduction with Increased Abortion Rate in Transgenic Mice That Overexpress 15-Lipoxygenase

15-Lipoxygenase (15-LOX) is a lipid-oxidizing enzyme that is involved in cell cycle regulation. To evaluate the effect of 15-LOX on reproduction, we studied transgenic mice that overexpress 15-LOX. The transgene was introduced over the genetic background of the low density lipoprotein receptor deficient mice (LDL-R(-/-)) and reproduction was compared to LDL-R(-/-) mice. We found a lower pregnancy rate in the 15-LOX/LDL-R(-/-) mice as compared to the LDL-R(-/-) mice (62.74 vs. 79.1%, p < 0.01). Additionally, a remarkably higher number of resorptions per pregnancy was found in the 15-LOX/LDL-R(-/-) mice (16.7 vs. 3.27%, p < 0.001) and it was accompanied by a significantly higher activity of the 15-LOX enzyme in these resorptions as compared to other tissues. These findings may implicate a role for 15-LOX in the development of spontaneous abortions.