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(Received for publication, May 13, 1996, and in revised form, July 11, 1996)
From the Departments of The capacity of neutrophils to generate
superoxide (O
Volume 271, Number 41,
Issue of October 11, 1996
pp. 25400-25405
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
,
Immunology and
¶ Bio-analytical Technology, Genentech, Inc.,
South San Francisco, California 94080
2) can be enhanced by prior exposure to
``priming'' agents such as interleukin-8 (IL-8), melanoma
growth-stimulatory activity (MGSA), and neutrophil-activating peptide
(ENA-78). The biological effects of these chemokines are mediated by at
least two distinct receptors: type A (IL-8-RA) and type B (IL-8-RB).
Using neutralizing monoclonal antibodies to IL-8-RA and IL-8-RB, we
have investigated the contribution each receptor makes to the priming
response. Preincubation with IL-8, MGSA, or ENA-78 enhanced the ability
of neutrophils to generate O
2 following stimulation with the
bacterial peptide formyl-Met-Leu-Phe. The priming effect of IL-8 was
eliminated by an anti-IL-8 monoclonal antibody (mAb) that is known to
bind IL-8 with high affinity and prevent receptor occupancy. Incubation
of neutrophils with a neutralizing mAb specific for IL-8-RA blocked
IL-8-induced priming but had no effect on priming by MGSA or ENA-78. In
contrast, treatment with a neutralizing mAb specific for IL-8-RB failed
to inhibit the priming effect of IL-8 but blocked both MGSA and
ENA-78-induced priming. These observations indicate that the priming
effect of IL-8 on the neutrophil respiratory burst is predominantly
mediated via IL-8-RA, whereas priming by MGSA and ENA-78 is mediated by
IL-8-RB.
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