TY - JOUR
T1 - High Telomerase Activity in Neutrophils From Unstable Coronary Plaques
AU - Narducci, Maria Lucia
AU - Grasselli, Annalisa
AU - Biasucci, Luigi Marzio
AU - Farsetti, Antonella
AU - Mulè, Antonino
AU - Liuzzo, Giovanna
AU - La Torre, Giuseppe
AU - Niccoli, Giampaolo
AU - Mongiardo, Rocco
AU - Pontecorvi, Alfredo
AU - Crea, Filippo
PY - 2007/12/18
Y1 - 2007/12/18
N2 - Objectives: We evaluated telomerase activity in circulating polymorphonuclear neutrophils (PMN) and in PMN isolated from coronary atherosclerotic plaques by a novel approach. Background: Delayed apoptosis of PMN have been demonstrated in unstable angina (UA). These cells have a finite lifespan with low telomerase activity, a polymerase that extends telomeres, structures essential for cell aging. Reactivation of telomerase has been associated with resistance to apoptosis. Methods: We studied 20 patients with UA and 6 patients with chronic stable angina (SA), undergoing a percutaneous coronary intervention. Circulating PMN were isolated from venous blood and PMN derived from coronary plaque were isolated from washing medium of angioplasty balloons. Results: Telomerase activity was higher in coronary plaque PMN of UA patients than in coronary plaque PMN of SA patients (122.7, range 20.5 to 3,696; and 47.7, range 16 to 212.6, respectively, p = 0.001) and higher than in peripheral PMN of SA patients (122.7, range 20.5 to 3,696 vs. 59, range 16.5 to 132.5, p = 0.001). We found a statistically significant difference between venous and coronary plaque PMN telomerase activity in UA patients (z = -2.875; p = 0.004). Among UA patients, a shorter time interval from symptom onset to coronary PMN sampling was the only independent predictor of high telomerase activity in coronary plaque PMN (p <0.001, R2 = 0.75). Conclusions: In UA patients, telomerase activity is high in coronary plaque PMN, while it is low in peripheral PMN. Telomerase reactivation in resident PMN resulting in a prolonged lifespan might play a key role in the early phases of instability.
AB - Objectives: We evaluated telomerase activity in circulating polymorphonuclear neutrophils (PMN) and in PMN isolated from coronary atherosclerotic plaques by a novel approach. Background: Delayed apoptosis of PMN have been demonstrated in unstable angina (UA). These cells have a finite lifespan with low telomerase activity, a polymerase that extends telomeres, structures essential for cell aging. Reactivation of telomerase has been associated with resistance to apoptosis. Methods: We studied 20 patients with UA and 6 patients with chronic stable angina (SA), undergoing a percutaneous coronary intervention. Circulating PMN were isolated from venous blood and PMN derived from coronary plaque were isolated from washing medium of angioplasty balloons. Results: Telomerase activity was higher in coronary plaque PMN of UA patients than in coronary plaque PMN of SA patients (122.7, range 20.5 to 3,696; and 47.7, range 16 to 212.6, respectively, p = 0.001) and higher than in peripheral PMN of SA patients (122.7, range 20.5 to 3,696 vs. 59, range 16.5 to 132.5, p = 0.001). We found a statistically significant difference between venous and coronary plaque PMN telomerase activity in UA patients (z = -2.875; p = 0.004). Among UA patients, a shorter time interval from symptom onset to coronary PMN sampling was the only independent predictor of high telomerase activity in coronary plaque PMN (p <0.001, R2 = 0.75). Conclusions: In UA patients, telomerase activity is high in coronary plaque PMN, while it is low in peripheral PMN. Telomerase reactivation in resident PMN resulting in a prolonged lifespan might play a key role in the early phases of instability.
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U2 - 10.1016/j.jacc.2007.08.048
DO - 10.1016/j.jacc.2007.08.048
M3 - Article
C2 - 18154960
AN - SCOPUS:37449012875
VL - 50
SP - 2369
EP - 2374
JO - Journal of the American College of Cardiology
JF - Journal of the American College of Cardiology
SN - 0735-1097
IS - 25
ER -