Based on synonyms in MeSH and EMTREE databases and assuming hyphenated terms will retrieve hyphenated terms as well as those with spaces.
MCP-1 OR MCP1 OR CC-chemokine-ligand-2 OR CCL2 OR CCL-2 OR mcaf OR mcp1 OR mcp-1 OR monocyte-chemoattractant-protein-1 OR monocyte-chemotactic-and-activating-factor OR Monocyte-Chemotactic-Protein-1