mRNA expression and protein levels of CC and CXC chemokines. Dams were given doxycycline throughout pregnancy and postnatally until the pups were killed at PN7. The IL-1β–induced mRNA expression and protein production of the CXC chemokines, keratinocyte-derived chemokine (KC) (A and B) and macrophage inflammatory protein (MIP)–2 (C and D), were decreased in β6−/− mice. IL-1β increased CXCR2 mRNA expression (E) similarly in β6+/+ and β6−/− mice. Absence of the β6 integrin subunit increased the mRNA expression and protein production of monocyte chemoattractant protein (MCP)–1 (F and G), and the mRNA expression of MCP-3 (H), in both control mice and IL-1β–expressing mice. The mRNA expression levels are shown relative to the mRNA expression level of control/β6+/+ mice, which was set to 1.0. Data are presented as means (±SEM) (n = 7–12 per group). *P < 0.05, **P < 0.01, ***P < 0.001.