Abstract Macrophages (M phi) and polymorphonuclear leukocytes (PMNs) are cell types that interact with bacterial endotoxin and play key roles in mediating the inflammatory reaction. We examined the ability of rat peritoneal macrophages and human PMNs to synthesize thromboxane A2 (detected as TxB2) in response to human recombinant interleukin 1 (hrIL1). TxB2 levels were measured by radioimmunoassay in the cell-free supernatant of cell suspensions after 1 hr incubation at 37 degrees C. TxB2 release by both PMNs and M phis was increased in a dose-dependent manner by hrIL1.
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