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M94A0622.TXT
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Document 0622
DOCN M94A0622
TI Effects of GMCSF and HIV-1 infection on the expression of CD11a on
monocyte-derived macrophages.
DT 9412
AU Stent G; Crowe SM; Macfarlane Burnet Centre for Medical Research,
Fairfield,; Australia.
SO Annu Conf Australas Soc HIV Med. 1993 Oct 28-30;5:73 (abstract no. SB5).
Unique Identifier : AIDSLINE ASHM5/94349033
AB OBJECTIVES: To examine the kinetics and regulation of CD11a on monocytes
(MO) and macrophages (Mphi). METHODS: Mphi were isolated from buffy
coats (n = 4) by density gradient centrifugation and plastic adherence
or elutriation. (1) MO were incubated with varying concentrations of
GMCSF (0-500U/ml) on the day of isolation and surface stained with CD11a
MAb (DAKO) at regular intervals. (2) Mphi were infected with HIV-1 (BaL)
at 5d post isolation and stained weekly with anti-CD11a. HIV-1 p24 Ag
expression was also determined by FACS. Percent positive cells and
equivalent molecules of fluorescence (EMF) as determined by calibration
beads, were quantitated by flow cytometry. RESULTS: (1) GMCSF
upregulated CD11a expression on Mphi in a dose dependent manner: 500U/ml
GMCSF, CD11a 91% staining (EMF 240,000.); no cytokine, CD11a 79% (EMF
92,000). (2) HIV-1 upregulated expression of CD11a: infected, CD11a 91%
+/- 35 (EMF 283,000 +/- 105,000); uninfected, CD11a 83% +/- 5 (EMF
191,000 +/- 76,000). CONCLUSION: Both GMCSF and HIV-1 appear to
upregulate surface expression of CD11a on Mphi. HIV may stimulate MO to
produce GMCSF which could in turn upregulate CD11a expression. This is
being investigated.
DE Cell Line Gene Expression Regulation, Viral/DRUG EFFECTS
Granulocyte-Macrophage Colony-Stimulating Factor/*PHARMACOLOGY Human
HIV-1/*GENETICS Lymphocyte Function-Associated Antigen-1/*GENETICS
Macrophages/IMMUNOLOGY/*MICROBIOLOGY Monocytes/IMMUNOLOGY/*MICROBIOLOGY
Up-Regulation (Physiology)/GENETICS Virus Integration/*DRUG
EFFECTS/GENETICS Virus Replication/*DRUG EFFECTS/GENETICS MEETING
ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).