title: Leukocyte mitochondrial alterations after cardiac surgery involving cardiopulmonary bypass: clinical correlations.
abstract: Cardiac surgery with the use of cardiopulmonary bypass (CPB) is known to initiate systemic inflammatory responses that are associated with immune dysregulations, but the pathomechanisms underlying these changes remain elusive. Mitochondrial transmembrane potential (MTP) is an important determinant of leukocytic functions and viability, and may be altered as a part of the cellular responses to systemic inflammatory insults. Therefore, we examined MTP in three subsets of peripheral leukocytes in 18 patients receiving uncomplicated cardiac surgery involving CPB. The MTP of neutrophils and lymphocytes significantly increased, whereas that of monocytes significantly declined, after the surgery. The alterations in leukocytic MTP were transient, normalizing 3 days to 1 week after the surgery, and were accompanied by transient overproduction of intracellular oxidants, including nitric oxide and superoxide. Despite these perturbations, the viability status of leukocytes remained unaltered. Positive correlations were found between the changes of leukocyte MTP and various clinical parameters, implying that leukocyte mitochondrial alterations are parts of the systemic immune perturbations induced by the bypass surgery.
authors.affiliation: Division of Critical Care, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan. cwkong@vghtpe.gov.tw
authors.forename: Chi-Woon
authors.initials: CW
authors.lastname: Kong
authors.forename: Cheng-Hsiung
authors.initials: CH
authors.lastname: Huang
authors.forename: Tai-Ger
authors.initials: TG
authors.lastname: Hsu
authors.forename: Kelvin K C
authors.initials: KK
authors.lastname: Tsai
authors.forename: Chen-Fu
authors.initials: CF
authors.lastname: Hsu
authors.forename: Mei-Chun
authors.initials: MC
authors.lastname: Huang
authors.forename: Lung-Ching
authors.initials: LC
authors.lastname: Chen
mesh_terms: D000368:Aged; D015415:Biomarkers / Q000097:blood; D002315:Cardiopulmonary Bypass / Q000009:adverse effects*; D002470:Cell Survival; D005260:Female; D006801:Humans; D007962:Leukocytes / Q000473:pathology*; D008297:Male; D008564:Membrane Potentials / Q000502:physiology; D008928:Mitochondria / Q000378:metabolism* / Q000473:pathology*; D009569:Nitric Oxide / Q000097:blood / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism; D013903:Thoracic Surgery
chemical_list: D015415:Biomarkers; D013481:Superoxides; D009569:Nitric Oxide