home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
HEALTH
/
MED9601.ZIP
/
M9610792.TXT
< prev
next >
Wrap
Text File
|
1996-01-30
|
4KB
|
57 lines
Document 0792
DOCN M9610792
TI Virus-specific antibody production and polyclonal B-cell activation in
the intestinal mucosa of HIV-infected individuals.
DT 9601
AU Eriksson K; Kilander A; Hagberg L; Norkrans G; Holmgren J; Czerkinsky C;
Department of Medical Microbiology and Immunology, University of;
Goteborg, Sweden.
SO AIDS. 1995 Jul;9(7):695-700. Unique Identifier : AIDSLINE MED/96035231
AB OBJECTIVE: To examine possible changes in mucosal B-cell activation
status. DESIGN: To examine the frequency and isotype distribution of
total and HIV-specific antibody-secreting cells (ASC) in the intestinal
mucosa of HIV-infected individuals. METHODS: Mucosal lymphocytes were
obtained by enzymatic treatment of duodenal pinch biopsies and the
numbers of ASC were assayed with the enzyme-linked immunospot technique.
RESULTS: High numbers of HIV-specific ASC were found in the intestine of
all HIV-infected individuals despite low levels of HIV-specific blood
ASC. All HIV-infected individuals had large numbers of intestinal
immunoglobulin (Ig) A-ASC against the HIV envelope glycoprotein gp160.
Eight out of nine patients also had HIV gp160-specific intestinal
IgG-ASC. These HIV-specific ASC were detected irrespective of disease
stage, route of infection, or levels of circulating CD4+ T cells.
HIV-specific ASC were found in peripheral blood from patients with CD4+
T cells > or = 100 x 10(6)/l blood, but in none of three patients with
low CD4+ T-cell counts. The frequencies of virus-specific ASC in the
blood were on average 100-fold lower than that observed within the
intestinal mucosa. Mucosal polyclonal B-cell activation was evident in
HIV-infected individuals, as documented by significantly elevated
numbers of Ig-secreting cells (ISC) in all three major Ig classes; on
average, seven-, five- and 20-fold numbers of IgA, IgG and IgM-ISC
compared with healthy controls. Furthermore, substantial numbers of ASC
reacting with unrelated antigens such as dog albumin and keyhole limpet
haemocyanin were detected in HIV-infected patients. Interestingly,
patients with CD4+ T cells < 100 x 10(6)/l blood displayed large numbers
of HIV-specific intestinal ASC even though total numbers of ISC,
including ASC reactive to unrelated antigens, were decreased.
CONCLUSIONS: The large numbers of virus-specific ASC found in the
intestine of HIV-infected individuals may be a consequence of local
replication of HIV-1 resulting in a continuous antigen stimulation. The
persistence of strong intestinal anti-HIV responses even at late stages
of disease suggest that the mucosal B-cell responses are functionally
intact throughout the disease. Furthermore, these results suggest that
there is no correlation between HIV-specific ASC numbers and polyclonal
B-cell activation. These observations indicate that intestinal B-cell
activation is profoundly disregulated in HIV-infected individuals.
DE Antibodies, Viral/*ANALYSIS Antibody Formation Antibody-Producing
Cells/*IMMUNOLOGY/PATHOLOGY/VIROLOGY
B-Lymphocytes/*IMMUNOLOGY/PATHOLOGY/VIROLOGY Female Gene Products,
env/IMMUNOLOGY Human HIV Infections/*IMMUNOLOGY/PATHOLOGY/VIROLOGY
Intestinal Mucosa/*IMMUNOLOGY/PATHOLOGY/VIROLOGY *Lymphocyte
Transformation Male Protein Precursors/IMMUNOLOGY Support, Non-U.S.
Gov't Support, U.S. Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).