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Induction of interleukin-6 during human immunodeficiency virus infection
DL Birx, RR Redfield, K Tencer, A Fowler, DS Burke and G Tosato
Division of Retrovirology, Walter Reed Army Institute of Research,
Washington DC.
Interleukin-6 (IL-6), a multifunctional cytokine produced in monocytes,
fibroblasts, and other cell types, is induced by a variety of stimuli,
including bacteria, viruses, and other cytokines. When normal monocyte
cultures were exposed to a monocytotropic strain of human immunodeficiency
virus (HIV), HTLV-IIIBa-L, significant levels of IL-6 bioactivity were
detected in the culture supernatants after 12 to 43 days of incubation, at
a time when there was associated evidence of HIV production. Similarly,
when normal monocyte cultures were cocultured with peripheral blood
mononuclear cells from HIV-infected individuals, HIV replication in these
cultures was associated with production of IL- 6. In further studies, we
determined that mean serum levels of IL-6 bioactivity were abnormally
elevated in HIV-seropositive individuals with stage 1/2 infection (25.2
x/divided by 1.8 U/mL) and stage 3/4 infection (46.1 x/divided by 1.7 U/mL)
when compared with normals (1.6 x/divided by 1.2 U/mL). In contrast mean
serum IL-6 levels were not different from normal in stage 5/6 infection
(2.7 x/divided by 1.6 U/mL). A selected group of 12 HIV-seropositive
individuals (stages 1, 2, and 3) who harbored HIV capable of replicating in
T cells but not in monocyte cultures had a mean serum IL-6 level of 5.3
U/mL (x/divided by 1.5), a value significantly lower (P less than .004)
than that measured in control HIV-seropositive individuals infected with
monocytropic HIV (39 x/divided by 1.9 U/mL). In addition, serum IL-6 levels
in HIV- seropositive individuals (stages 1 through 6) correlated directly
with serum immunoglobulin G (IgG) levels (R = .74, P less than .001).
Monocytes but not T cells are capable of a high level IL-6 production in
vitro, and monocyte-derived IL-6 stimulates Ig production in activated B
cells. Thus, HIV-seropositive individuals who often are infected with
monocytotropic HIV and often display abnormally elevated serum IgG levels
may exhibit these abnormalities as a consequence of abnormally elevated
IL-6 levels induced by HIV.
Volume 76,
Issue 11,
pp. 2303-2310,
12/01/1990
Copyright © 1990 by The American Society of Hematology

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