Effect of Cryopreservation on Endothelin-1 Productions of Human Mammary Artery

• Published in: Thrombosis research Vol. 97; no. 6; pp. 451 - 455
• Main Authors: Cacoub, Patrice, Nataf, Patrick, Carayon, Alain, Dorent, Richard, Eurin, Joelle, Piette, Jean Charles, Gandjbakhch, Iradj
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 15.03.2000
• Subjects: Cryopreservation; Cyclic GMP - biosynthesis; Cyclic guanosine monophosphate; Endothelin-1; Endothelin-1 - biosynthesis; Graft artery; Humans; Mammary Arteries - metabolism; Mammary artery; Neuropeptide Y; Neuropeptide Y - biosynthesis; Neuropeptide Y; Mammary artery; Graft artery; Cryopreservation; Me 2SO, dimethyl sulfoxide; Endothelin-1; Cyclic guanosine monophosphate; ET-1, endothelin-1; NPY, neuropeptide Y; cGMP, cyclic guanosyl monophosphate production
• ISSN: 0049-3848; 1879-2472
• DOI: 10.1016/S0049-3848(99)00200-5

The aim of this study was to determine the ability of human mammary artery cells to maintain a metabolic activity by measuring the artery concentration of two vasoactive substances, endothelin-1 (ET-1) and cyclic guanosyl monophosphate (cGMP), and a neurohumoral substance—neuropeptide Y (NPY)—prior to and following cryostorage. Ten distal segments of internal mammary arteries were obtained at the time of surgery in patients who had undergone coronary artery bypass grafting. One ring of each vessel served as a fresh control for the other ring that was used in cryopreservation experiments. The arteries were frozen with liquid nitrogen at a controlled rate down to –130°C with an automatic freezing machine and were then stored in a liquid nitrogen vapor at −150°C. After mammary artery extraction, ET-1, cGMP, and NPY concentrations were studied before and after cryopreservation. Cryopreserved, compared to fresh arteries, exhibited an increase in ET-1 (11.11±1.61 vs. 3.09±0.06 pg/mg; p=0.004) and a decrease in cGMP (9.88±2.04 vs. 8.55±2.07 p moles/mg; p<0.02), whereas there was no significant NPY variation. An increase in ET-1 and decrease in cGMP was found in 10 out of 10 and 6 out of 10 of cryopreserved artery specimen, respectively. There was no significant correlation between ET-1 and cGMP production in fresh or in cryopreserved arteries. The present method of cryostorage is effective in preserving “hormonal” mammary artery activity. However, the particularly high ET-1 concentration without associated cGMP concentration may be deleterious by increasing smooth-muscle cell proliferation and vascular tone of cryopreserved arteries.