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Circulating progenitor cells are increased in newly diagnosed untreated hypertensive patients with arterial stiffening but normal carotid intima-media thickness.
MedLine Citation:
PMID:  21593737     Owner:  NLM     Status:  Publisher    
Circulating progenitor cells (CPCs), including endothelial progenitor cells (EPCs), have a key role in endothelium repair. Cellular NADPH oxidase (Nox) enzymes, including Nox-containing gp91phox, represent a source of reactive oxygen species (ROS); ROS trigger protective signals but may also have detrimental effects. Cellular defenses against ROS include the enzymes manganese superoxide dismutase (MnSOD), catalase (CAT) and glutathione peroxidase type-1 (GPx-1). We investigated the relationships of CPCs with cellular gp91phox, MnSOD, CAT, GPx-1 and ROS levels and with carotid intima-media thickness (cIMT) and stiffness in hypertensives without additional risk factors for cardiovascular disease. CPCs from 53 newly diagnosed, untreated hypertensives and from 29 controls were isolated and identified by flow cytometry. gp91phox, MnSOD, CAT, and GPx-1 mRNA and protein expression and ROS generation were evaluated in enriched samples of CD34(+) cells; cIMT and stiffness were assessed. Hypertensives showed higher arterial stiffness (P<0.001) but no difference in cIMT with respect to controls. ROS generation was slightly increased (P=0.04), whereas gp91phox, MnSOD, CAT and GPx-1 were significantly higher (P<0.001) with respect to controls, as was CPC number (P<0.001), but EPCs were no different. CPC and EPC numbers correlated with gp91phox, ROS and fibrinogen (P<0.001); moreover, gp91phox, MnSOD, CAT and GPx-1 were correlated with CPC number. In early phases of arterial hypertension, before the development of wall thickening and even in the presence of arterial mechanical impairment, CPC number may be increased to maintain an adequate number of EPCs in peripheral blood.Hypertension Research advance online publication, 19 May 2011; doi:10.1038/hr.2011.56.
Giuseppe Mandraffino; Maria A Sardo; Stefania Riggio; Saverio Loddo; Egidio Imbalzano; Angela Alibrandi; Carlo Saitta; Maurizio Cinquegrani; Enrico M Mormina; Antonino Saitta
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-5-19
Journal Detail:
Title:  Hypertension research : official journal of the Japanese Society of Hypertension     Volume:  -     ISSN:  1348-4214     ISO Abbreviation:  -     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-5-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9307690     Medline TA:  Hypertens Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Internal Medicine and Medical Therapy, University of Messina, Messina, Italy.
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