Cytokine that induces the release of T-cell-attracting chemokines from monocytes and, in particular, enhances the maturation of CD11c(+) dendritic cells. Can induce allergic inflammation by directly activating mast cells. May act as an antimicrobial peptide in the oral cavity and on the skin. Interacts with a receptor composed of CRLF2 and IL7R. Binding of TSLP to CRLF2/TSLPR is a mechanistic prerequisite for recruitment of IL7R to the high-affinity ternary complex. Isoform 1 is expressed in a number of tissues including heart, liver and prostate. Isoform 2 is the predominant form in keratinocytes of oral mucosa, skin and in salivary glands. It is secreted into saliva. Released by primary epithelial cells in response to certain microbial products, physical injury, or inflammatory cytokines. Truncated N-terminus. Extended N-terminus.