title: [Lactate dehydrogenase isozymes in skeletal muscle of patients with chronic obstructive pulmonary disease].
abstract: OBJECTIVE
  In patients with chronic obstructive pulmonary disease (COPD), lactate dehydrogenase (LDH) levels in skeletal muscles are normal or tend to be elevated; on exercise, these levels increase more rapidly than in individuals without COPD. As it is likely that concentrations of LDH isozymes LDH(4) and LDH(5) are elevated in such patients, we measured those isozymes in peripheral muscle of patients with COPD.
  
  
  METHODS
  Eighteen patients with COPD and 10 healthy nonsmokers were included in the study. Spirometry and the 6-minute walk test were performed, and a biopsy of the quadriceps muscle was taken to measure levels of both total LDH and LDH isozymes by agarose gel electrophoresis and to classify the types of muscle fibers.
  
  
  RESULTS
  Controls and patients had similar concentrations of total LDH (mean [SE], 130 [30]micromol/min/g vs 152 [50]micromol/min/g, respectively) and LDH isozymes. A subgroup of 5 patients showed increased levels of isozymes LDH(1), LDH(2), and LDH(3), with decreased LDH(5) levels; these patients were women and had a lower oxygen saturation. The LDH(5) level was directly correlated with the 6-minute walk test and oxygen saturation. The percentage of type IIA fibers correlated directly with LDH(3) and LDH(4) concentrations whereas type IIX fibers were inversely correlated with LDH(3) concentration.
  
  
  CONCLUSIONS
  Measurement of LDH isozyme concentrations enabled a subgroup of patients to be identified with a higher concentration of cardiac isoenzymes and lower concentration of muscle isoenzymes, a situation which might indicate adaptation that favors aerobic metabolism.
authors.affiliation: Sección de Adaptación Muscular, Instituto de Medicina Experimental, Universidad Central de Venezuela, Caracas, Venezuela. sonia.hecker@ucv.ve
authors.forename: Sonia H
authors.initials: SH
authors.lastname: Torres
authors.forename: María  Montes
authors.initials: M
authors.lastname: de Oca
authors.forename: Eduardo
authors.initials: E
authors.lastname: Loeb
authors.forename: Priva
authors.initials: P
authors.lastname: Zabner-Oziel
authors.forename: Valentina
authors.initials: V
authors.lastname: Wallis
authors.forename: Noelina
authors.initials: N
authors.lastname: Hernández
mesh_terms: D005260:Female; D006801:Humans; D007527:Isoenzymes / Q000032:analysis; D007770:L-Lactate Dehydrogenase / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000737:chemistry* / Q000201:enzymology; D029424:Pulmonary Disease, Chronic Obstructive / Q000201:enzymology*
chemical_list: D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase