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M94A3086.TXT
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Document 3086
DOCN M94A3086
TI High levels of beta-hexoaminidase and A-mannosidase in sera of HIV+
individuals.
DT 9412
AU Lugering N; Stoll R; Kucharzik T; Busch H; Domschke W; Department of
Medicine B, University Munster, Germany.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):157 (abstract no. PB0053). Unique
Identifier : AIDSLINE ICA10/94369489
AB OBJECTIVE: 1. To assess the value of lysosomal glycosidases as markers
for detection of the different stages of HIV disease. 2. To get
information about mechanisms of release of lysosomal glycosidases under
pathological conditions. METHODS: We measured activities of four
different lysosomal glycosidases in sera of 62 patients at the different
stages of HIV infection and in 30 healthy controls. The corresponding
p-nitrophenyl glycosidases were used as substrates. Furthermore a
procedure was used that allows the characterization of the molecular
forms of cathepsin D in human serum. RESULTS: Serum concentrations of
a-mannosidase and beta-hexoaminidase were significantly (p < 0.0001)
increased in patients with HIV CDC III and CDC IV without correlation to
CD4+ count and secondary infection. Activity of a-mannosidase
(beta-hexoaminidase) was 780.4 +/- 337.8 U/ml (34.7 +/- 11.2 U/ml) for
those with HIV CDC IV, 412 +/- 143 U/ml (27.6 +/- 7.5 U/ml) for those
with HIV CDC III, and 206.2 +/- 95.3 U/ml (9.1 +/- 2.0 U/ml) for the
healthy controls. For a-glucuronidase and beta-galactosidase no
statistically significant differences were found. In human serum
cathepsin D was present only in its high-molecular-weight precursor
forms. DISCUSSION AND CONCLUSIONS: The presence exclusively of high
levels of precursors of cathepsin D in the sera of patients with HIV CDC
III and CDC IV suggests that in this illness secretion of lysosomal
enzymes is markedly elevated, rather than the enzymes leaking from
damaged cells. Thus characterization of molecular forms of cathepsin-D
as well as determination of levels of beta-hexoaminidase and
a-mannosidase in sera of HIV individuals may be useful for better
detection and pathogenetic understanding of the different stages of HIV
infection.
DE beta-N-Acetylhexosaminidase/*BLOOD Biological Markers/BLOOD Cathepsin
D/BLOOD Enzyme Precursors/BLOOD Glycoside Hydrolases/BLOOD Human HIV
Infections/CLASSIFICATION/*DIAGNOSIS/ENZYMOLOGY HIV
Seropositivity/CLASSIFICATION/*DIAGNOSIS/ENZYMOLOGY Mannosidases/*BLOOD
MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).