Aim. Reflux of duodenal contents can induce mucosal injury, stimulate cell proliferation, and promote tumorigenesis. We examined the expression of COX2 and p53 in rat esophageal lesions induced by duodenal content reflux. Methods. Thirty 8-week-old male Wistar rats were exposed to duodenal content esophageal reflux. All animals underwent an esophagoduodenal anastomosis (EDA) with total gastrect...

BACKGROUND Siblings and other first-degree relatives of patients with "sporadic" (i.e., apparently nonfamilial) colorectal cancer or precursor adenomatous colon polyps have an increased risk of developing colon neoplasia. This observation suggests the presence of inherited genetic determinants for sporadic colon neoplasia. Mice homozygous for a null cyclooxygenase 2 (COX2) (also called PTGS2) a...

The involvement of nuclear genes in mitochondrial gene expression was investigated by identifying alterations in mitochondrial gene expression that occur when teosinte cytoplasms are introduced into certain maize inbred nuclear backgrounds. The cytoplasms from the teosintes Zea perennis, Zea diploperennis, and Zea luxurians were introduced into the maize A619 or W23 lines by recurrent backcross...

PURPOSE Cyclooxygenase (COX) enzyme catalyzes the production of prostaglandins, which are important mediators of tissue destruction in periodontitis. Single nucleotide polymorphisms of COX2 enzyme have been associated with increasing susceptibility to inflammatory diseases. The present study evaluates the association of two single nucleotide polymorphisms in COX2 gene (-1195G>A and 8473C>T) wit...

17 Study hypothesis: Steroid receptor coactivator interacting protein (SIP/KANK2) is involved in 18 regulating the expression of the prostaglandin (PG)-endoperoxide synthase 2 (PTGS2; also known as 19 cyclo-oxygenase 2, COX2) and PG release in human myometrium. 20 Study finding: SIP is phosphorylated in myometrial cells in response to epidermal growth factor 21 (EGF)-stimulation and is required...

We have demonstrated previously that cyclo-oxygenase-2 (COX2), the rate-limiting enzyme in the biosynthesis of prostaglandins (PGs), is essential for blastocyst implantation and decidualization. However, the candidate PG(s) that participates in these processes and the mechanism of its action remain undefined. Using COX2-deficient mice and multiple approaches, we demonstrate herein that COX2-der...

Preeclampsia (PE) is a disorder of pregnancy that manifests as late gestational maternal hypertension and proteinuria and can be life-threatening to both the mother and baby. It is believed that abnormal placentation is responsible for the cascade of events leading to the maternal syndrome. Embryo implantation is critical to establishing a healthy pregnancy. Defective implantation can cause adv...

Chronic hepatitis B is a disease of the liver that can progress to cirrhosis and liver cancer. The HBx (hepatitis B virus X) protein of hepatitis B virus is a multifunctional regulator that induces ER (endoplasmic reticulum) stress by previously unknown mechanisms. ER stress plays a critical role in inflammatory induction and COX2 (cyclo-oxygenase 2) is an important mediator of this inflammatio...

Cytochrome c oxidase subunit II (Cox2p) of Saccharomyces cerevisiae is synthesized within mitochondria as a precursor, pre-Cox2p. The 15-amino acid leader peptide is processed after export to the intermembrane space. Leader peptides are relatively unusual in mitochondrially coded proteins: indeed mammalian Cox2p lacks a leader peptide. We generated two deletions in the S. cerevisiae COX2 gene, ...