BACKGROUND: Endothelial progenitor cells (EPCs), involved in the repairing mechanisms of vascular damage, are positively correlated to insulin-like growth factor I (IGF-I) concentrations in healthy adults. However, the levels of EPCs and their role in acromegalic patients have never been investigated. AIM: We conducted a cross-sectional study in order to assess the levels of the different phenotypes of circulating EPC in acromegalic patients. SUBJECTS AND METHODS: The study was performed at the Endocrinology Unit of Federico II University and at the Unit of Metabolic Diseases and Endocrinology of the Second University of Naples. Fifty-five acromegalic patients and 65 healthy controls were studied. EPCs were assessed by flow cytometry and IGF-I by immunoradiometric assay. RESULTS: Compared with subjects of the control group, acromegalic patients showed significantly higher levels of EPCs phenotypes expressing KDR antigen [KDR+, cells per 106 events, median and interquartile range, 44 (28-67) vs 23 (13-40), p=0.006; CD34+KDR+ 25 (18-38) vs 12 (8-17), p<0.001; CD133+KDR+ 17 (13-30) vs 8 (6-12), p<0.001; CD34+KDR+CD133+ 16 (12-25) vs 8 (6-10), p<0.001]. There was a positive correlations between CD34+KDR+CD133+ cells count and IGF-I in acromegaly group (r=0.79, p<0.001). CONCLUSIONS: Acromegalic patients show higher circulating EPCs levels expressing KDR, positively correlated with IGF-I, suggesting a role for IGF-I in regulating the expression of this surface marker in the early phase of EPCs differentiation.
BACKGROUND: Endothelial progenitor cells (EPCs), involved in the repairing mechanisms of vascular damage, are positively correlated to insulin-like growth factor I (IGF-I) concentrations in healthy adults. However, the levels of EPCs and their role in acromegalicpatients have never been investigated. AIM: We conducted a cross-sectional study in order to assess the levels of the different phenotypes of circulating EPC in acromegalicpatients. SUBJECTS AND METHODS: The study was performed at the Endocrinology Unit of Federico II University and at the Unit of Metabolic Diseases and Endocrinology of the Second University of Naples. Fifty-five acromegalicpatients and 65 healthy controls were studied. EPCs were assessed by flow cytometry and IGF-I by immunoradiometric assay. RESULTS: Compared with subjects of the control group, acromegalicpatients showed significantly higher levels of EPCs phenotypes expressing KDR antigen [KDR+, cells per 106 events, median and interquartile range, 44 (28-67) vs 23 (13-40), p=0.006; CD34+KDR+ 25 (18-38) vs 12 (8-17), p<0.001; CD133+KDR+ 17 (13-30) vs 8 (6-12), p<0.001; CD34+KDR+CD133+ 16 (12-25) vs 8 (6-10), p<0.001]. There was a positive correlations between CD34+KDR+CD133+ cells count and IGF-I in acromegaly group (r=0.79, p<0.001). CONCLUSIONS:Acromegalicpatients show higher circulating EPCs levels expressing KDR, positively correlated with IGF-I, suggesting a role for IGF-I in regulating the expression of this surface marker in the early phase of EPCs differentiation.
Authors: Katherine Esposito; Miryam Ciotola; Maria Ida Maiorino; Francesco Giugliano; Riccardo Autorino; Marco De Sio; Emmanuele Jannini; Andrea Lenzi; Dario Giugliano Journal: J Sex Med Date: 2009-01 Impact factor: 3.802
Authors: M Peichev; A J Naiyer; D Pereira; Z Zhu; W J Lane; M Williams; M C Oz; D J Hicklin; L Witte; M A Moore; S Rafii Journal: Blood Date: 2000-02-01 Impact factor: 22.113
Authors: T Asahara; T Murohara; A Sullivan; M Silver; R van der Zee; T Li; B Witzenbichler; G Schatteman; J M Isner Journal: Science Date: 1997-02-14 Impact factor: 47.728
Authors: Richard M Martin; David Gunnell; Elise Whitley; Andrew Nicolaides; Maura Griffin; Niki Georgiou; George Davey Smith; Shah Ebrahim; Jeff M P Holly Journal: J Clin Endocrinol Metab Date: 2008-01-22 Impact factor: 5.958