PMID- 9430491 OWN - NLM STAT- MEDLINE DCOM- 19980203 LR - 20180213 IS - 1018-2438 (Print) IS - 1018-2438 (Linking) VI - 115 IP - 1 DP - 1998 Jan TI - Intradermal injection of monocyte chemoattractant protein-1 induces emigration and differentiation of blood monocytes in rat skin. PG - 15-23 AB - BACKGROUND: Monocyte chemoattractant protein-1 (MCP-1) is a potent chemoattractant for blood monocytes in vitro. Recent studies in MCP-1-transgenic mice revealed that the local production of MCP-1 caused monocyte infiltration. However, the kinetics of monocyte infiltration after the production of MCP-1 or the amount of MCP-1 necessary for monocyte recruitment are not known. METHODS: We purified recombinant rat MCP-1 expressed in COS-7 cells, and injected it into rat skin. The infiltrating cells were examined by immunohistochemistry and ultrastructural peroxidase cytochemistry. RESULTS: Rat recombinant MCP-1 had a molecular mass of approximately 30 kD and exhibited the peak monocyte chemotactic activity at 10(-9) M. One microgram of MCP-1 caused intra- and extravascular accumulation of mononuclear cells 3 h after injection. The cells were ED1+, indicating they were blood monocytes. The infiltration of mononuclear cells peaked at 12-24 h, and most of them were TRPM-3+ and ED3+, characteristic to exudate macrophages. None of the cells expressed ED2 or Ki-M2R antigens, markers for resident macrophages, until 3 days after injection. There was no uptake of [3H]thymidine by the infiltrating cells. Ultrastructural peroxidase cytochemistry confirmed that the infiltrating cells were monocytes and exudate macrophages. The number of OX8+ lymphocytes also peaked at 12 h, consisting of approximately 9% of the total infiltrating cells. CONCLUSION: These results indicate that MCP-1 attracts blood monocytes as early as 3 h and the infiltrating monocytes differentiate into exudate macrophages in loco. However, this effect was transient and the infiltration of monocytes did not result in tissue damage. FAU - Yamashiro, S AU - Yamashiro S AD - Second Department of Pathology, Kumamoto University School of Medicine, Japan. FAU - Takeya, M AU - Takeya M FAU - Kuratsu, J AU - Kuratsu J FAU - Ushio, Y AU - Ushio Y FAU - Takahashi, K AU - Takahashi K FAU - Yoshimura, T AU - Yoshimura T LA - eng PT - Journal Article PL - Switzerland TA - Int Arch Allergy Immunol JT - International archives of allergy and immunology JID - 9211652 RN - 0 (Antibodies, Monoclonal) RN - 0 (Chemokine CCL2) RN - 0 (Recombinant Proteins) SB - IM MH - Animals MH - Antibodies, Monoclonal/immunology MH - Blood Vessels/immunology MH - COS Cells MH - Cell Count MH - Cell Differentiation MH - Cell Movement MH - Cells, Cultured MH - Chemokine CCL2/genetics/*immunology/isolation & purification MH - Chemotaxis, Leukocyte MH - Immunohistochemistry MH - Leukocytes/cytology/immunology MH - Lymphocytes/cytology/immunology MH - Macrophages/immunology/ultrastructure MH - Male MH - Microscopy, Electron MH - Monocytes/cytology/*immunology/ultrastructure MH - Rats MH - Rats, Wistar MH - Recombinant Proteins/immunology/isolation & purification/metabolism MH - Skin/immunology/pathology/ultrastructure MH - Specific Pathogen-Free Organisms EDAT- 1998/01/16 05:44 MHDA- 2000/10/06 11:01 CRDT- 1998/01/16 05:44 PHST- 1998/01/16 05:44 [pubmed] PHST- 2000/10/06 11:01 [medline] PHST- 1998/01/16 05:44 [entrez] AID - iaa15015 [pii] AID - 10.1159/000023825 [doi] PST - ppublish SO - Int Arch Allergy Immunol. 1998 Jan;115(1):15-23. doi: 10.1159/000023825.