title: Tissue and blood superoxide dismutase activity and malondialdehyde level in leprosy.
abstract: BACKGROUND
  Oxidative stress (OS) results from an imbalance between free radical generating and scavenging systems. The end product of lipid peroxidation, malondialdehyde (MDA) serves as a marker of cellular damage. Superoxide dismutase (SOD) traps free radicals and acts as a free radical scavenging system.
  
  
  OBJECTIVE
  To study OS indices in paucibacillary (PB) and multibacillary (MB) leprosy in tissues and blood.
  
  
  METHODS
  The study group comprised untreated PB patients (n = 14), untreated MB patients (n = 18) and normal human volunteers (n = 20). SOD activity, MDA level and MDA/SOD ratio were estimated in both blood and tissue.
  
  
  RESULTS
  Compared with controls, SOD activity in tissues decreased significantly in both PB and MB patients, while SOD activity in erythrocytes decreased significantly only in MB. In addition, MDA levels increased significantly in tissues of both PB and MB patients. Moreover, the mean level of MDA in plasma of MB patients was significantly higher, whereas there was no significant difference in that of PB patients. This study showed significant increase in OS index (MDA/SOD ratio) in tissue of PB and MB patients and in blood of MB patients only, whereas there was no significant difference in OS index in blood of PB patients compared with that in the controls.
  
  
  CONCLUSIONS
  Oxidative stress was observed in both tissues and blood of MB patients and in tissues of PB patients, denoting its crucial involvement in the pathogenesis of leprosy. This can constitute an important tool in prognosis, treatment and control of leprosy.
authors.affiliation: Department of Dermatology, Assiut University, Assiut, Egypt. hishamzayan@yahoo.com
authors.forename: H Z
authors.initials: HZ
authors.lastname: Abdel-Hafez
authors.forename: E-Em
authors.initials: EE
authors.lastname: Mohamed
authors.forename: A A
authors.initials: AA
authors.lastname: Abd-Elghany
mesh_terms: D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000378:metabolism; D001706:Biopsy; D016022:Case-Control Studies; D015331:Cohort Studies; D006801:Humans; D007918:Leprosy / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D015227:Lipid Peroxidation / Q000502:physiology; D008315:Malondialdehyde / Q000378:metabolism*; D018384:Oxidative Stress / Q000502:physiology; D017382:Reactive Oxygen Species / Q000378:metabolism; D012867:Skin / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D013482:Superoxide Dismutase / Q000378:metabolism*; D055815:Young Adult
chemical_list: D015415:Biomarkers; D017382:Reactive Oxygen Species; D008315:Malondialdehyde; D013482:Superoxide Dismutase