RCM-1 blocks the nuclear localization and increased the proteasomal degradation of FOXM1, a transcription factor critical for the differentiation of goblet cells from airway progenitor cells. In cultured airway epithelial cells, RCM-1 reduces IL-13 and STAT6 signaling and prevented the expression of the STAT6 target genes Spdef and Foxa3, which are key transcriptional regulators of goblet cell differentiation.

RCM-1 reduces airway resistance, increased lung compliance, and decreased proinflammatory cytokine production in mice exposed to the house dust mite and interleukin-13 (IL-13), which triggers goblet cell metaplasia. In mice, RCM-1 reduces IL-13 and STAT6 signaling and prevented the expression of the STAT6 target genes Spdef and Foxa3.