Changes during development of COX 1 and 2 in heart, abdominal and thoracic aorta (837.11)

Abstract

Cyclooxigenase 1 and 2 have been related in the release of prostanoids that regulate the effect of various agonists as in the case of phenylephrine, but its unknown that how this enzyme is involved in the contractile response to phenylephrine age‐dependent. The aim of this paper is to analyze changes of COX 1 and 2 involvements in the contractile response to phenylephrine in the thoracic and abdominal aorta and coronary artery of pubescent, young and old rats. It has been describe that during development there are changes in the activity of some enzymatic pathways, in this work we analyze the change in the involvement of cyclooxygenase and PGs in the contractile effect of phenylephrine with age. Methods: we used male rats of 6, 16 weeks and 1 year of age. Rats were anesthetized with pentobarbital (50 mg / kg), after that we proceeded to obtain the thoracic aorta and abdominal aorta and the heart and they were placed in an isolated organ system where we proceeded to make concentration response curves to phenylephrine. On the other hand we obtain heart and aorta for the western blot analysis and the immunohistochemistry assay of COX 1 and COX 2. Conclusions: COX1 increase during development. On the other hand COX2 decrease in the elderly stage only in thoracic aorta.Grant Funding Source: COFAA / IPN