Expression of the endoplasmic reticulum oxidoreductase Ero1α in gastro-intestinal cancer reveals a link between homocysteine and oxidative protein folding.

AIM: Ero proteins are central to oxidative protein folding in the endoplasmic reticulum (ER), but their expression varies in a tissue-specific manner. The aim of this work was to establish the expression of Ero1α in the digestive system and to examine the behavior of Ero1α in premalignant Barrett's esophagus, esophageal (OE) and gastric cancers and esophageal cancer cell lines. RESULTS: Ero1α is expressed in the columnar epithelium of Barrett's tissue, and in OE tumors and gastric tumors. Homocysteine, a precursor in the metabolism of cysteine and methionine, induces the active Ox1 form of Ero1α in the OE cancer cell line OE33. INNOVATION: These results demonstrate for the first time that Ero1α can sense the level of an amino acid precursor, identifying a potential link between diet, antioxidants, and oxidative protein folding in the ER. CONCLUSION: The high expression of Ero1α in cancers of the esophagus and stomach demonstrates the importance of ER redox regulation in the gastro-intestinal (GI) tract in health and disease. Proteins and metabolites involved in disulfide bond formation and redox regulation may be suitable targets for both biomarker and drug development in GI cancer.

Severe wound traction-blisters after inadequate dressing application following laparoscopic cholecystectomy: case report of a preventable complication.

BACKGROUND: The inadequate application of postoperative dressings can lead to significant complications, including skin injuries, compartment syndromes, and potential limb loss. To our knowledge, the occurrence of post laparoscopic cholecystectomy related skin complications have not yet been reported in the peer-reviewed literature. CASE PRESENTATION: Following laparoscopic cholecystectomy for symptomatic gallstone disease, a seventy eight year old healthy white male broke out in painful erythema on either side of his epigastric port site. Vesicles akin to a partial thickness burns were revealed upon removal of dressings. An unusual indentation created by the dressing, and skin traction by the dressing's adhesive edges were implicated, raising questions about technique of its application. CONCLUSION: Incorrect application of wound dressings can disrupt skin architecture, causing painful blistering. This complication should not occur to patients, as it is theoretically 100% preventable. Avoidance of stretching adhesive dressings, and careful adherence to relevant manufacturers' instructions are recommended.