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1996-03-04
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Document 0621
DOCN M9640621
TI Adhesion of human neuroblasts to HIV-1 tat.
DT 9604
AU Cornaglia-Ferraris P; De Maria A; Cirillo C; Cara A; Alessandri G;
Department of Pediatric Hematology/Oncology, G. Gaslini; Children's
Hospital, Genoa, Italy.
SO Pediatr Res. 1995 Nov;38(5):792-6. Unique Identifier : AIDSLINE
MED/96124129
AB Several neuropathologic findings in infants and children with human
immunodeficiency virus type-1 (HIV-1) infection are different from those
observed in adults, probably related to the fact that the retroviral
infection occurs in the setting of neuro-development. This report
describes the interaction and biologic activity of tat, the HIV-1
trans-activating protein on human neuroblasts. Two human neuroblastoma
cell lines, LAN-5 and GI-CA-N, have been studied for their capability to
adhere to tat (full recombinant protein) and to two different peptide
residues of it. Both cells adhere to tat and tat46-60 basic domain,
although not to tat65-80 residue, which contains the RGD
(arginine-glycine-aspartic acid) motif. Adhesion to collagen I was
inhibited by preincubating GI-CA-N cells with tat,46-60 although not
with tat,65-80 indicating the capability of the basic residue to
interfere with collagen I-induced cellular adhesion. The expression of
200-kD neurofilaments induced by collagen I was not induced by tat,46-60
indicating that neural differentiation along the same pathway is not
mimicked by this peptide. Neuroblast cell proliferation was not affected
by adhesion to tat46-60 nor to tat.65-80 GI-CA-N cells are not
permissive to HIV-1 infection. However, proviral DNA was documented in
the cell lysate for 14 consecutive in vitro passages, whereas HIV-1
transcription was never detectable. This would exclude the possibility
that tat would be transduced by these cells. GI-CA-N stained negative
for CD4, although positive for Gal-C, which may explain HIV-1 entry.
Results show that immature human neural cells interact with tat protein
and/or its basic residue in vitro. A mechanism similar to that herein
described would possibly be active in vivo, which may help in clarifying
the pathogenic mechanisms of neurologic dysfunction and destruction of
the CNS observed in infants infected with HIV-1.
DE Amino Acid Sequence Cell Adhesion Cell Division Extracellular
Matrix/METABOLISM Gene Products, tat/*METABOLISM Human
HIV-1/*METABOLISM Integrins/METABOLISM Molecular Sequence Data
Neurofilament Proteins/METABOLISM Neurons/*VIROLOGY Protein Binding
Structure-Activity Relationship Tumor Cells, Cultured JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).