Adventitium-derived relaxing factor may be a protein factor secreted by adipocytes with non-species-specificity and not limited to periadventitial fat / 中国药理学与毒理学杂志

ABSTRACT

AIM To test if "adventitium-derived relaxing factor"(ADRF) possesses species- and tissue-specificity and make preliminary research on proteins separated from the bath solution. METHODS Record the tension of aortic ring with and without periadventitial fat, induced by phenylephrine(Phe) and analyze the proteins extracted from the bath solution with SDS-PAGE electrophoresis. RESULTS ① In Sprague-Dawley rats, the concentration-response curve of Phe to rings without the periadventitial fat shifted to rightward, as compared to the curve of the intact aortic rings, which means periadventitial fat can reduce the contraction induced by Phe. The same phenomena as the above could be found in aortic ring of Wistar rats, guinea pigs, and rabbits. ② Moreover, the contraction induced by Phe was obviously reduced by moving adipose tissue from greater omentum into the bath solution. ③ The release of ADRF was strongly reduced by 10 μmol·L-1 genistein (tyrosine kinase inhibitor). But the effect of existed ADRF could not be counterposed by genistein. ④ Five protein bands were separated from the bath solution, with relative molecular mass 74.0, 59.8, 54.4, 28.7 and 13.8 ku. CONCLUSION ① ADRF is a non-species specific factor. ② The entire name of ADRF should change from "adventitium-derived relaxing factor" to "adipocyte-derived relaxing factor". ③ Some proteins which may include ADRF are separated from the bath solution.