Building the lymphatic drainage system

The engineers are the transcription factors, Foxc2 and NFATc1. Foxc2 had been implicated in lymph vessel development already, but Norrmén and colleagues have now found that the factor specifically regulates a late stage of lymph development when large, valve-containing vessels arise from more primitive capillaries.

Foxc2 built the lymph vessel valves with the help of NFATc1, which was a known heart valve engineer. Norrmén and colleagues also showed that Foxc2 and NFATc1 physically interact and that many DNA binding sites for the two transcription factors are closely linked. This latter finding generated a long list of target genes that might be controlled by the two factors.

The team now plans to investigate these targets as well as to work out the upstream molecular pathways controlling Foxc2 and NFATc1. Whatever the mechanisms, if the team can show that Foxc2 and NFATc1 also prompt lymph vessel regeneration in adults, boosting these factors could help patients with lymph drainage problems - including those that have suffered extensive tissue injuries, or have had lymph nodes removed as part of cancer treatment.

More information: The study will be published online April 27 (www.jcb.org) and will appear in the May 4 print issue of the Journal of Cell Biology.

Source: Rockefeller University (news : web)