The lysosomal N-acetyl-β-d-glucosaminidase (NAG) isoenzymes in plasma: Study of distribution in a general population by a simple routine chromatofocusing procedure

Giancarlo Goi, Chiara Bairati, Carla Roggi, Laura Maccarini, Guido Tettamanti, Cesare Meloni, Adriana Lombardo

Research output: Contribution to journalArticle

Abstract

We have adapted for routine analysis a pre-existing method for separating the three major N-acetyl-β-d-glucosaminidase (NAG) isoenzyme forms - A, B+II and I2 - by chromatofocusing followed by fluorimetric assay of the enzyme activity. This method combines good resolution, accurate quantification of the different isoenzymes and high reproducibility with an acceptable degree of analytical precision. We have applied it to studying the isoenzyme levels in the plasma of a general population of 417 subjects and have analysed these enzyme activities as functions of age, sex, body mass and declared alcohol consumption. Unlike the levels of unfractionated enzyme, levels of all the isoenzymes were higher in men than in women at all ages except in the 20-29 year group. Isoenzyme I2 showed the greatest sex difference. On the whole, with increasing age, both sexes showed more or less regular increases in plasma levels of all the isoenzymes. We also found significant correlations for the population as a whole with age and with body mass index. The only significant correlation with alcohol consumption was for B+I1 in men.

Original languageEnglish
Pages (from-to)47-57
Number of pages11
JournalClinica Chimica Acta
Volume221
Issue number1-2
DOIs
Publication statusPublished - Nov 30 1993

Keywords

  • Distribution in a general population
  • Isoenzymes
  • N-Acetyl-β-d-glucosaminidase
  • Plasma levels
  • Routine chromatofocusing procedure

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry

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