Abstract
The C-C chemokines, macrophage inflammatory protein (MIP)1alpha and MIP1beta are potent chemoattractants for the monocytes, which form an important component of the stroma of tumor tissue and may regulate tumor growth and associated inflammation. We examined the role of MIP1alpha and MIP1beta in inducing the release of inflammatory cytokines and the generation of tumoricidal monocytes from the peripheral blood monocytes (PBM) of healthy women and patients with carcinoma of breast (CaBr). Interleukin-1 (IL-1) and tumor necrosis factor (TNF) alpha release by the PBM was markedly stimulated by MIP1alpha in CaBr patients, but only marginally so in healthy women. In contrast, MIP1beta stimulated the release of these cytokines by the PBM of healthy women, but failed to do so in CaBr patients. MIP1alpha, but not MIP1beta, synergized with LPS in inducing the release of IL-1 from the PBM of both healthy women and CaBr patients. Both MIP1alpha and MIP1beta augmented respiratory bursts in PBM and generated tumoricidal PBM that killed T24 cells, MIP1alpha being more effective in CaBr patients and MIP1beta in healthy women. IFN-gamma co-stimulated and IL-4 suppressed MIP1alpha and beta-induced cytotoxicity in PBM. The synergy of IFN-gamma w...Continue Reading
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