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M9650030.TXT
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1996-03-09
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Document 0030
DOCN M9650030
TI Uptake of human immunodeficiency virus envelope protein gp120 by human
trophoblast in culture.
DT 9605
AU Esterman AL; Finlay TH; Lee JD; Dancis J; Department of Pediatrics, New
York University Medical Center, NY; 10016, USA.
SO Am J Obstet Gynecol. 1996 Jan;174(1 Pt 1):49-54. Unique Identifier :
AIDSLINE MED/96148667
AB OBJECTIVE: Our purpose was to determine whether human trophoblast has a
cell surface CD4 antigen that will bind to gp120, the envelope protein
of human immunodeficiency virus. STUDY DESIGN: Uptake of iodine
125-labeled gp120 by trophoblast in culture was measured. Particular
attention was paid to technical details that may have caused the
contradictory results reported by previous investigators: the source of
the recombinant gp120, the method of radioiodination, and the isolation
procedure of trophoblast to ensure elimination of contaminating cells,
particularly macrophages. RESULTS: Uptake of transferrin-free iodine
125-labeled gp120 to trophoblast was unaffected by adding a 200 molar
excess of gp120, by preincubating gp120 with soluble CD4 to block the
CD4 binding sites on gp120 and by preincubation of trophoblast with a
blocking antibody to CD4 (OKT4a). In contrast, uptake of gp120 by
CD4-positive H9 human lymphocytes was reduced 79% by a 200 molar excess
of gp120 and > 50% by a CD4-blocking antibody. CONCLUSIONS: Uptake of
gp120 to trophoblast is by a high capacity, CD4-independent mechanism
that is probably nonspecific and may be related to the mechanism for
binding other circulating glycoproteins in maternal blood.
DE Animal Antigens, CD4/METABOLISM Baculoviridae/GENETICS CD4-Positive
T-Lymphocytes/METABOLISM CHO Cells Electrophoresis, Polyacrylamide Gel
Female Hamsters Human HIV Envelope Protein gp120/*METABOLISM *HIV-1
Iodine Radioisotopes Pregnancy Recombinant Proteins/METABOLISM
Support, U.S. Gov't, P.H.S. Tissue Culture
Trophoblast/IMMUNOLOGY/*METABOLISM JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).