Abstract
The receptor tyrosine kinase c-Kit plays crucial roles in lymphocyte development but there is little information on the molecular circuitry enforcing c-Kit expression. In addition to growth factors, Notch signaling is essential for T cell development. In this issue of the European Journal of Immunology, evidence is provided for an interesting link between c-Kit and Notch. The primary 'test subjects' were a Pax5-deficient 'pro-B cell' line, blocked in its B cell potential, and its non-mutated counterpart, a bone marrow-derived early progenitor with lymphoid and myeloid potential (EPLM). Similar to common lymphoid progenitors, EPLM have a 'B cell-biased' potential, yet show multipotency under appropriate conditions. Following Notch signaling, c-Kit expression was very rapidly upregulated and the development into T cells was found to be c-Kit-dependent. In the absence of Notch signals, c-Kit expression remained low. Development into non-T cell fates (NK or myeloid) was found to be c-Kit-independent. It remains to be determined whether c-Kit is a 'direct' target of the Notch signal transduction pathway; however, these findings, together with those of others, strongly suggest that Notch can contribute to the proper cytokine receptor...Continue Reading
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