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1996-02-26
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Document 0731
DOCN M9620731
TI Effect of HIV vertical transmission on the ontogeny of T cell antigens
involved in the regulation of humoral immune response.
DT 9602
AU Brugnoni D; Soresina A; Airo P; Ugazio AG; Notarangelo LD; Cattaneo R;
Duse M; Clinical Immunology Service, Spedali Civili, Brescia, Italy.
SO Clin Exp Immunol. 1995 Nov;102(2):238-42. Unique Identifier : AIDSLINE
MED/96069869
AB HIV infection causes progressive impairment of humoral immunity,
including defective specific antibody production. To evaluate whether
vertical HIV infection interferes with the expression on CD4+
lymphocytes of developmentally regulated molecules, that play a crucial
role in the generation of immunological memory (CD45 isoforms) and in
attainment of antibody responses (CD40L), 22 HIV-infected children and
36 seroreverted children born to HIV+ mothers were studied. The
percentage of CD40L+ PBMC after activation in vitro with phorbol
myristate acetate (PMA) plus ionomycin was lower in HIV-infected
children than in controls (P < 0.004). This correlated with the
depletion of CD4+ lymphocytes (r = 0.75; P < 0.001). CD40L expression
rose progressively with age (r = 0.36; P = 0.03) in seroreverted
children, but not in HIV-infected children, suggesting that while in
normal children in vivo antigen stimulation results in progressive
attainment of CD40L expression (and thus to effective T-B cell
cooperation), this process is largely defective in HIV-infected
children, contributing to the genesis of humoral immune deficiency. The
proportion of CD4+ cells bearing the CD45RO isoform was increased among
HIV-infected infants during the first years of life. However, the
percentage of CD4+ CD45RO+ peripheral blood mononuclear cells (PBMC)
progressively increased with age in controls (r = 0.69; P = 0.03), but
not in HIV-infected children, showing that while vertical transmission
of HIV does not prevent CD45RO expression early in life, it is
associated with a disturbance of the physiological process of antigen
priming, contributing to poor immunological memory to T cell-dependent
antigens.
DE Age Factors Antigens, CD45/*METABOLISM Child Child, Preschool
CD4-Positive T-Lymphocytes/*IMMUNOLOGY Disease Transmission, Vertical
Female Human HIV/*IMMUNOLOGY HIV Infections/*CONGENITAL/TRANSMISSION
Infant Male Membrane Glycoproteins/*METABOLISM Support, Non-U.S.
Gov't T-Lymphocyte Subsets/IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).