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Asthmatic airways feature increased ASM mass that is largely attributable to hyperplasia, and which potentially contributes to excessive airway narrowing. T cells induce ASMC proliferation via contact-dependent mechanisms in vitro that may have importance for asthmatic ASM growth, as CD4+ T cells infiltrate ASM bundles in asthmatic human airways. In this study, we used an in vitro migration assay to investigate the pathways responsible for the trafficking of human CD4+ T cells to ASM. ASMCs induced chemotaxis of activated CD4+ T cells,