Antioxidant and anti-ageing effects of oleuropein aglycone in canine skeletal muscle cells

Reactive oxygen species (ROS) are normally produced in skeletal muscle. However, an imbalance in their regulatory systems can lead to their accumulation and ultimately to oxidative stress, which is one of the causes of the ageing process. Companion dogs share the same environment and lifestyle as humans, making them an excellent comparative model for the study of ageing, as well as they constitute a growing market for bioactive molecules that improve the quality of life of pets. The anti-ageing properties of oleuropein aglycone (OLE), a bioactive compound from olive leaves known for its antioxidant properties, were investigated in Myok9 canine muscle cell model. After incubation with OLE, senescence was induced in the canine cellular model by hydrogen peroxide (H2O2). Analyses were performed on cells after seven days of differentiation. The oxidative stress induced by H2O2 treatment on differentiated canine muscle cells led to a significant increase in ROS formation, which was reduced by OLE pretreatment alone or in combination with H2O2 by about 34% and 32%, respectively. Cells treated with H2O2 showed a 48% increase the area of senescent cells stained by SA-β-gal, while OLE significantly reduced the coloured area by 52%. OLE, alone or in combination with H2O2, showed a significant antioxidant activity, possibly through autophagy activation, as indicated by the expression of autophagic markers.

MicroRNA Milk Exosomes: From Cellular Regulator to Genomic Marker

Recent advances in ruminants' milk-derived exosomes (EXO) have indicated a role of microRNAs (miRNAs) in cell-to-cell communication in dairy ruminants. The miRNAs EXO retain peculiar mechanisms of uptake from recipient cells, which enables the selective delivery of cargos, with a specific regulation of target genes. Although many studies have been published on the miRNAs contained in milk, less information is available on the role of miRNAs EXO, which are considered stable over time and resistant to digestion and milk processing. Several miRNAs EXO have been implicated in the cellular signaling pathway, as in the regulation of immune response. Moreover, they exert epigenetic control, as extenuating the expression of DNA methyltransferase 1. However, the study of miRNAs EXO is still challenging due to the difficulty of isolating EXO. In fact, there are not agreed protocols, and different methods, often time-consuming, are used, making it difficult to routinely process a large number of samples. The regulation of cell functions in mammary glands by miRNAs EXO, and their applications as genomic markers in livestock, is presented.

[Palliative surgery in nonresectable pancreatic carcinoma]

The authors report 30 cases of adenocarcinoma of the pancreas treated with palliative surgery at the 2nd Department of Surgery of S. Maria delle Croci Hospital in Ravenna, in the period 1985-1991. Biliary bypass or gastroenterostomy were performed because of severe jaundice and duodenal obstruction, and not with prophylactic intent. According to Fortner's classification 60% of the neoplasias were stage 3, 36.7% stage 2, and 3, 3% stage 1 tumors. The hospitalization mean time was 15 days, perioperative mortality was 6.6% and mean survival rate was 6.5 months. The authors conclude that palliative surgical treatment is useful in case of neoplastic biliary and duodenal stenoses, with no liver or lung metastases, and also whenever an histological evaluation of the tumor is necessary to evaluate resection chances.

[Cystic lymphangioma of the colon. Report of a case]

The authors report a rare case of cystic lymphangioma of the colon. Cystic lymphangioma is a benign neoplasm, that originate from lymphatic structures; it unusually involves the large bowel. This tumor has some original features: big dimension, intracystic sepiments, bad demarcation from surroundings structures. Diagnostic examinations are aspecific, showing only a generic mass, which structure is assessable with abdominal echography or TC. A definite diagnosis is only possible with surgical resection.